Tag Archives: wax

March 8, 2021

Recent Developments in Supercritical CO₂ Winterization

By Aaron Green

Supercritical carbon dioxide (CO₂) extraction is a processing technique whereby CO₂ is pressurized under carefully controlled temperatures to enable extraction of terpenes, cannabinoids and other plant molecules. Once the extract is obtained the crude is often subjected to an ethanol winterization process to remove chlorophyll, fats and waxes.

Green Mill Supercritical is a Pittsburgh-based manufacturing and engineering company focused on cannabis and hemp extraction. The company offers a range of CO ₂ extraction equipment where users can tune and control their extraction methods. They recently announced a technology advance enabling winterization in-process, which has the potential to remove the need for ethanol winterization.

We spoke with Jeff Diehl, director of marketing at Green Mill Supercritical, to learn more about the new process. Jeff was working in the tech industry in San Francisco in 2017 when he was invited to join Green Mill by his cousin, Jeremy Diehl, who is the founder and CTO.

Aaron Green: Before we get to your new technology, can you explain what industry trends you are watching?

Jeff Diehl: A big thing that I watch is the premium extract space. More and more consumers are demanding higher premium extracts. They want differentiated products. They want products that are safe and that have some kind of meaningful connection to the specific plant from which they came. Right now, CO₂plays a small role in the market for those products. Most premium products are generated through hydrocarbon extraction. So, I am watching how people are using CO₂to create the next generation of safe, premium products.

Aaron: What is the normal process for a CO₂ extraction today?

Jeff Diehl, director of marketing at Green Mill Supercritical

Jeff: The current CO₂ extraction process generally consists of two major phases to producing your final extract. In the first phase, you have extraction where you get your crude product. The second phase is post-extraction where you do cleanup to get your refined oil. Within that post-extraction phase, most operations include an ethanol-based winterization process.

Aaron: What does the winterization step do, exactly?

Jeff: Winterization is about removing waxes. Your main extraction is considered crude because it’s got a lot of materials from the plant that you don’t want. The large majority of unwanted material is waxes. Winterization is the process of using a solvent, traditionally ethanol, to separate the waxes from the cannabinoids. There are multiple challenges inherent in ethanol-based winterization that introduce cost, time and product loss. It’s terribly inefficient. Plus, there will always be residual ethanol left in your final product, and that’s not something consumers appreciate.

Aaron: You’ve recently announced a new process at Green Mill that moves the winterization step into the supercritical CO₂ equipment. Can you explain how that works?

Jeff: With our process, which we call Real-Time Winterization, there is no ethanol involved in winterization anymore. It is all done with CO₂ during the primary extraction. That’s the major advance of our process and although it has been attempted before, no one has succeeded at doing it in a viable way. You take a process which is normally four days – one day for CO2 extraction and three days for ethanol winterization – and you do it all in less than a day. We have automated software, sensors and pumps that makes this all possible.

Aaron: How does the quality of the resulting product compare with the new process?

Jeff: You can see the difference right away, if you’re at all familiar with extraction. It just looks clean and bright. Lab analysis has been very positive thus far, but we continue to run tests. Our R&D team has done multiple tests, mostly on hemp and CBD. That’s because we don’t have a license for THC. We’re currently engaging with a licensed partner so that we can collect more data on THC-containing products, so we can give exact numbers. But with CBD, we’ve done multiple tests to validate the method and the technology, and are seeing consistently excellent results in regards to both purity of the product and efficiency of the process.

Aaron: How do yields compare between the processes?

Jeff: From the data that we’ve seen in the industry, it looks like when you winterize with ethanol, you leave anywhere from 5 to 10% of your cannabinoids behind in the waxes. That’s just lost. With Real-Time Winterization using CO₂ we have seen recovery rates as high as 99%. We are continuing to investigate that result with testing to make sure it was not an outlier, but in any case, recovery rates look promising.

Aaron: One of the other issues with ethanol is taxes and the ability to find food grade supply. Do you have any perspective you can share on that?

Jeff: There are a number of advantages to moving away from ethanol. The sheer quantity of ethanol is a factor. There are a lot of regulations and fire requirements around managing large quantities of ethanol. The ethanol winterization process itself is not just one process. There are multiple stages, from mixing, to freezing, to filtering, to removing the solvent. These are all opportunities for things to go wrong, so you’re always managing those risks. Multiple large pieces of equipment, including fume hoods, filter skids, cryo freezers and rotary evaporators, are expensive and require heavy management.

I think Elon Musk said the best process is no process. Anytime in an industrial process when you can remove steps in the process, that’s the direction you want to go in. And, that’s what we’ve done. With this recent work, we have effectively removed post processing for certain categories of end product.

Aaron: Do you have any patents on the new process?

Jeff: We have a patent pending on both the method and the equipment, which is allowing us to talk about this as much as we are.

Aaron: So, how does this work if somebody already owns an existing piece of Green Mill equipment? Is this something that can be retrofitted? Is it a software upgrade?

Jeff: There are two components. One is an equipment upgrade, which can be done retroactively for existing customers, and one is a methodology upgrade, which we assist our customers with. The automation software inherently can handle the settings that you need to run the methodology. In fact, it’s that software and the rest of our existing tech stack, the proprietary pump, the triple inline fractionation, the precision and stability of the overall system, that is what made this winterization advance possible.

Aaron: Where are you rolling this out first? And do you plan to go international?

Jeff: International is definitely in the plan, since we’ve already sold systems abroad. We are currently getting ready to announce the opening of our beta program with the new technology. So, we’re not ready to sell this widely at this time, but we are taking submissions from companies that want to get in early and join us at the forefront of CO₂ extraction innovation.

Aaron: Okay, great. Thanks Jeff, that’s the end of the interview.

February 16, 2021

THC Remediation of Hemp Extracts

By Darwin Millard

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Remediation of delta-9 tetrahydrocannabinol (d9-THC) has become a hot button issue in the United States ever since the Drug Enforcement Agency (DEA) released their changes to the definitions of marijuana, marijuana extract, and tetrahydrocannabinols exempting extracts and tetrahydrocannabinols of a cannabis plant containing 0.3% or less d9-THC on a dry weight basis from the Controlled Substances Act. That is because, as a direct consequence, all extracts and tetrahydrocannabinols of a cannabis plant containing more than 0.3% d9-THC became explicitly under the purview of the DEA, including work-in-progress “hemp extracts” that because of the extraction process are above the 0.3% d9-THC limit immediately upon creation.

The legal ramifications of these changes to the definitions on the “hemp extracts” marketplace will not be addressed. Instead, this article focuses on the amount of d9-THC that is available in the plant material prior to extraction and tracks a “hemp extract” from the point it falls out of compliance to the point it becomes compliant again and stresses the importance of accurate track-n-trace protocols at the processing facility. The model developed to support this article was intended to be academic and was designed to follow the d9-THC portion of a “hemp extract” through the lifecycle of a typical CO2-based extract from initial extraction to THC remediation. A loss to the equipment of 2% was used for each step.

Initial Extraction

For this exercise, a common processing scenario of 1000 kg of plant material at 10% cannabidiol (CBD) and 0.3% d9-THC by weight was modeled. This amount, depending on scale of operations, can be a facility’s total capacity for the day or the capacity for a single run. 1000 kg of plant material at 0.3% d9-THC has 3 kg of d9-THC that could be extracted, purified, and diverted into the marketplace. CO2 has a nominal extraction efficiency of 95%, meaning some cannabinoids are left behind in the plant material. The same can be said about the recovery of the extract from the equipment. Traces of extract will remain in the equipment and this little bit of material, if unaccounted for, can potentially open an operator up to legal consequences. Data for the initial extraction is shown in Image 1.

Image 1: Summary Data Table for Typical CO2-based Extraction of Phytocannabinoids

As soon as the initial extract is produced it is out of compliance with the 0.3% d9-THC limit to be classified as a “hemp extract”, and of the 3 kg of d9-THC available, the extract contains approx. 2.8 kg, because some of the d9-THC remains in the plant material and some is lost to the equipment.

Dewaxing via Winterization and Solvent Removal

Dewaxing a typical CO2 extract via winterization is a common process step. For this exercise, a wax content of 30% by weight was used. A process efficiency of 98% was attributed to the wax removal process and it was assumed that 100% of the loss can be accounted for in the residue recovered from the equipment rather than in the removed waxes. Data for the winterization and solvent recovery are shown in Image 2 and 3.

Image 2: Summary Data Table for Typical Winterization of a CO2 Extract

Image 3: Summary Data Table for Solvent Removal from a CO2 Extract

Two things occur during winterization and solvent removal, non-target constituents are removed from the extract and there is compounded loss from multiple pieces of process equipment. These steps increase the concentration of the d9-THC portion of the extract and produce two streams of noncompliant waste.

Decarboxylation & Devolatilization

Most cannabinoids in the plant material are in their acid form. For this exercise, 90% of the cannabinoids were considered to be acid forms. Decarboxylation is known to produce a mass difference of 87.7%, i.e. the neutral forms are 12.3% lighter than the acid forms. Heat was modeled as the primary driver and a process efficiency of 95% was used for the conversion rate during decarboxylation. To simplify the model, the remaining 5% acidic cannabinoids are presumed destroyed rather than degraded into other compounds because the portion of the cannabinoids which get destroyed versus degrade into other compounds varies from process to process.

Devolatilization is the process of removing low-molecular weight constituents from an extract to stabilize it prior to distillation. Since the molecular constituents of cannabis resin extracts vary from variety to variety and process to process, the extracts were assumed to consist of 10% volatile compounds. The model combines the decarboxylation and devolatilization steps to account for complete decarboxylation of the available acidic cannabinoids and ignores their weight contribution to the volatiles collected during devolatilization. Destroyed cannabinoids result in an amount of loss that can only be accounted for through a complete mass balance analysis. Data for decarboxylation and devolatilization are shown in Image 4.

Image 4: Summary Data Table for Decarboxylation and Devolatilization of a CO2 Extract

As the extract moves along the process train, the d9-THC concentration continues to increase. Decarboxylation further complicates traceability because there is both a known mass difference associated with the process and an unknown mass difference that must be calculated and justified.

Distillation

A two-pass distillation was modeled. On each pass a portion of the extract was removed to increase the cannabinoid concentration in the recovered material. Average data for distilled “hemp extracts” was used to ensure the model did not over- or underestimate the concentration of the cannabinoids in the distillate. The variables used to meet these data constraints were derived experimentally to match the model to the scenario described and are not indicative of an actual distillation. Data for distillation is shown in Image 5.

After distillation, the d9-THC concentration is shown to have increased by 874% from the original concentration in the plant material. Roughly 2.2 kg of the available 3 kg of d9-THC remains in the extract, but 0.8 kg of d9-THC has either ended up in a waste stream or walking out the door.

Chromatography – THC Remediation Step 1

Chromatography was modeled to remove the d9-THC from the extract. Because there are several systems with variable efficiency rates at being able to selectively isolate the d9-THC peak from the eluent stream, the model used a 5% cut-off on the front-end and tail-end of the peak, i.e. 5% of the material before the d9-THC peak and 5% of the material after the d9-THC peak is assumed to be collected along with the d9-THC. Data for chromatography is shown in Image 6.

Image 6: Summary Data Table for d9-THC Removal using Chromatography

After chromatography, a minimum of three products are produced, compliant “hemp extract”, d9-THC extract, and noncompliant residue remaining in the equipment. The d9-THC extract modeled contains 2.1 kg of the available 3 kg in the plant material, and is 35% d9-THC by weight, an increase of 1335% from the distillation step and 11664% from the plant material.

CBN Creation – THC Remediation Step 2

For this exercise, the d9-THC extract was converted into cannabinol (CBN) using heat rather than cyclized into d8-THC, but a similar model could be used to account for this scenario. The conversion rate of the cannabinoids into CBN through heat degradation alone is low. Therefore, the model assumes half of the available cannabinoids in the d9-THC extract are converted to CBN. The entirety of the remaining portion of the cannabinoids are assumed to convert to some form of degradant rather than a portion getting destroyed. Data for THC destruction is shown in Image 7.

Image 7: Summary Data Table for THC Destruction through Degradation into CBN

Only after the CBN cyclization step has completed does the product that was the d9-THC extract become compliant and classifiable as a “hemp extract.”

Image 8: Summary Data Table for Reconciliation of the d9-THC Portion of the Hemp Extract

Throughout the process, from initial extraction to the final d9-THC remediation step, loss occurs. Of the 3 kg of d9-THC available in the plant material only 2.1 kg was recovered and converted to CBN. 0.9 kg was either lost to the equipment, destroyed in the process, attributable to the mass difference associated with decarboxylation, or was never extracted from the plant material in the first place. All of these potential areas of product loss should be identified, and their diversion risk fully assessed. Not every waste stream poses a risk of diversion, but some do; having a plan in place to handle waste the DEA considers a controlled substance is essential. Without a track-n-trace program following the d9-THC and identifying the potential risk of diversion would be impossible. The point of this is not to instill fear, instead the intention is to shed light on a very real issue “hemp extract” producers and state regulators need to understand to protect themselves and their marketplace from the DEA.

February 8, 2021

Hardware Platforms in Cannabis: A Q&A with Mike McDonald, President and CEO of Ammonite

By Aaron Green

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More and more we are seeing the development of proprietary hardware platforms in cannabis. With proprietary technology in hand, manufacturers often lean on MSOs, LPs and other brand partners to grow their business through existing sales channels.

We spoke with Mike McDonald, President and CEO at Ammonite, to learn more about the history of the Dablicator™ platform and Ammonite’s North American brand partner strategy. Mike formed Ammonite as a spin-off company from Jetty Extracts after getting to know the founders in a real estate transaction. Prior to Ammonite, Mike was an operator in the manufacturing and product development space, having helped to launch the Giant bicycle brand as well as growing and eventually selling the Atlas Snowshoe Company to K2 Sports.

Aaron: How did you get involved in cannabis?

Mike: Well, like a lot of folks in the industry, my background is pretty eclectic. I come primarily from an operator’s perspective – I’ve been in manufacturing, product development and company growth for my whole career. I lived in Taiwan for several years and helped to launch the Giant bicycle brand worldwide. I was also involved with a ski business that was started at Stanford as a thesis project called Atlas Snowshoe Company. Fast-forward, we built it into the largest snowshoe brand and activity in the US and later sold it to K2 Sports. So, I’ve always been involved in the growth of product-related businesses.

I’ve also done some real estate development as well; I actually sold our building to the Jetty guys, which is how we met. In that process, I got involved with their company, helped Jetty reorganize its business model, raise some money, and then just got addicted to the whole industry and really found it fascinating. I liked the team at Jetty and couldn’t resist jumping in, and now I’ve been full-time in the business for over three years.

Aaron: How did you get involved in Ammonite?

Mike: Ammonite is actually a spin out company from Jetty Extracts, which is one of the largest brands in California. Our main Ammonite product is called the Dablicator™ Oil Applicator, which was originally invented at Jetty as a medical device for cancer patients. We saw a big demand for it as a private label partnership product, so we decided to spin out a separate hardware company and really focus on developing unique IP and CBD and cannabis related hardware.

Aaron: What trends are you following in the industry?

Mike: Certainly the MSOs of the world are really expanding and the top three to five are making a mark with growth and more sophistication in the market. I think the social equity movement is really a big component that we’re all excited about in the industry. You’re seeing the larger players really put their money where their mouth is around that. We’ve always been a big part of that in California.

Specifically, regarding trends in the cannabis space, Colorado and California are probably the two most mature markets. We generally say what’s happening in California and Colorado eventually make their way out to the rest of the world. Vaping was invented in California and Colorado, and now it’s a huge part of the business where before, four or five years ago, the market was mostly flower-centric.

There’s a trend away from inhalables, with more awareness around lung-related illnesses and of course COVID, so we’re seeing a big growth in edibles, drinks and so forth. Interestingly enough, although it’s an inhalable, infused pre-rolls are a big growth sector as well. Jetty is actually launching an infused pre-roll program in February.

Folks are looking for ways to get their medicine without smoking – and this has definitely led to a growth in the oil application business. Oil application has traditionally been delivered via a syringe. Dablicator™ oil applicator is essentially an improved, more convenient syringe. On the medical side, patients have been taking oil sublingually, putting it in food and drink and so forth for years because a lot of them can’t smoke. As that trend transfers over to the adult use market, oil application is becoming really big. You can take it sublingually; you can put it in your food or beverage. On the recreational side, you can add it to your loose flower or joints, or of course, dab it directly onto your rig via the heat resistant tip.

Further, you’re probably familiar with a lot of these portable dab rigs that are taking off, like the G Pen Roam and the Puffco Peak and a variety of others. So now you can dab on the go with your standard wax and shatter in a jar. It’s just not the most convenient way if you’re up on a hike or on a mountain bike ride. So now, with a portable dab rig and something like the Dablicator™ oil applicator, you can have a really convenient mess-free way to enjoy cannabis. The big growth in concentrates and areas that aren’t necessarily inhalables is where our product hardware really fits in.

Aaron: How did you come up with the idea for the Dablicator?

Mike: The Jetty team had a friend that had brain cancer. He was doing a lot of chemotherapy and was having trouble eating and keeping weight on and he couldn’t smoke. So, the guys at Jetty began to bring him cannabis oil, which he was able to use ingesting it from a spoon initially and it really helped him with his pain, his anxiety and his appetite. In that process, we realized that there wasn’t really a great way to deliver oil. Syringes were there, but they were kind of sketchy and they weren’t convenient.

So, the Jetty team developed a better mousetrap. Several iterations later, this Dablicator™ product was ready for patients. In fact, it became a big part of the Jetty Shelter Project, a non-profit where the team delivers cannabis to cancer patients, and it was a very much sought-after product delivery device in that world. So, it was developed inside of a need on the medical side and it’s really sort of grown inside the expansion on the adult-use side.

Aaron: Can you explain how the Dablicator™ oil applicator works from a perspective of form and function?

Mike: Pre-Dablicator™ you would use a syringe type product – for direct oil application, sublingual application, or as an add on to your flower. The difference between Dablicator™ oil applicator and a traditional syringe is that Dablicator™ is a twist and plunge product. Imagine a pen filled with oil, but instead of inhaling it, you’re able to dispense it through a tip that is heat resistant, which means you can apply directly to your dab rig nail. You’re able to put it in your pocket without fear of cannabis oil leakage. It’s discreet, precise, compact and portable.

Aaron: How does the user dose using Dablicator™ oil applicator?

Mike: Basically, there’s measurements on the plunger of 55 milligrams apiece – one click is 55 milligrams, and you can dispense as many clicks as you like. What’s cool about the product itself is if you’ve clicked too many times accidentally, you can back it off and the excess oil won’t dispense. You can go to dablicator.com and see demo videos as well.

Aaron: Dablicator™ oil applicator started as a Jetty Extracts spin-off. I see you are now white labeling for other oil brands. How do you go about selecting your partners?

Mike: We call it our brand partner program. It’s not too dissimilar to what other hardware manufacturers, like PAX and GPen, are doing. We’ve got a patented and innovative device where our brand partners, MSOs and leading brands throughout the US and Canada, can take their existing vape and tincture oils and offer them in Dablicator™ oil applicator hardware.

Our focus is signing up major, well respected brands and MSOs on to the “platform,” meaning they are able to immediately offer between six and ten new SKUs to their consumers. They take their existing oils, put them into a custom branded Dablicator™ hardware unit and add their custom branded packaging. It’s a full turnkey solution. For example, one of our partners, 710 Labs, is developing their RSO and were shopping for a delivery method specifically geared towards medical patients. Within eight weeks, we had a custom program for them and delivered hardware, and we assisted on the packaging front as well.

Our partners have to be reputable folks that are interested in developing or delivering oil in a unique and innovative way. Frankly, our early partners are those that see where the growth is. 710 Labs is on the platform, as well as Surterra in Florida, Ancient Roots in Ohio, and we’ve got multiple conversations going to some of the other MOSs and the LPs in Canada.

Aaron: Are the brand partners loading the oil applicator themselves?

Mike: We customize the product for them and then ship them unassembled and empty. In their lab, they use the same machinery and equipment they use to fill their vape cartridges. They then fill their Dablicator™, assemble it, package it and ship it out just like any other product that they’re processing and manufacturing.

Aaron: What kind of oils are suitable for Dablicator™?

Mike: Pretty much any oil that’s going into a vape cart is suitable and then some. Some of our customers, including Jetty, started out with a THC distillate. Live resin is becoming a big product category in California as well as solventless oils. Dablicator™ oil applicator can accommodate everything from distillate to live resin to solventless to RSO and even full spectrum CBD. If it can flow, if it doesn’t crystallize up like shatter and sugars and diamonds, you can put it into Dablicator™, even the thickest of oils. It’s designed to contain any kind of liquids that are flammable.

Aaron: What geographies are you currently in?

Mike: We’re in multiple states throughout the US and actually just signed up with an LP in Canada. We only launched the program in August of 2020, and today we’ve got partners California, Colorado, Ohio, Arizona, Missouri, Florida, soon to be Michigan, Illinois, and throughout Canada.

Aaron: Any plans for international expansion beyond North America?

Mike: We’re getting inquiries on a regular basis from all over the place, including internationally. We’re in conversations with some folks down in Brazil. Spain is actually a big cannabis market and we’re having some conversations with some folks there. The inquiries are coming in faster than we can process the relationships, but right now our major focus is on North America.

Aaron: What are your goals with Ammonite?

Mike: We are developing a category, right? So today, oil dispensing isn’t top of mind. Today, if you want oil, you go into a dispensary and say, “Hey, give me those syringes.” My goal is that a year from now, you can walk into Harborside in Oakland and you see a wall of different branded Dablicator™ oil applicators. The goal is to really turn the oil dispensing business into a category, and then position Dablicator™ oil applicator as the best and leading product in that category.

Aaron: What are you personally interested in learning more about?

Mike: Well, I’ve got two teenagers – two daughters, as a matter of fact, a freshman and a senior – and they’re being homeschooled right now. So that’s been quite an interesting development!

I think on the cannabis side, it’s just fascinating what it is as a business model. It’s the most recent multi-billion-dollar opportunity in consumer products. You only get a chance to participate in something like that maybe once in a lifetime. I’m really looking forward to seeing it become more adopted into the mainstream and it’s already becoming that way from a consumer perspective. I am watching the cannabis market become legal from a federal perspective, hoping that the social equity component of the industry really stays with it.

I’ve been in a lot of businesses over the years; I feel like one of the gray hairs in this business that is actually an operator versus someone who came over from the financial side. I am continuing to learn, grow and work with great people and this has been a really amazing experience for me.

Aaron: Okay, great. Mike, that’s the end of the interview. Thank you for your time today!

January 12, 2021

Advancements in Extraction & the Growth of the Concentrate Category

By Dr. Dominick Monaco

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Due to quick progressions in legalization, today’s cannabis industry bears little resemblance to the industry of five years ago. As the cannabis space gains mainstream acceptance, it resembles more “traditional” industries closely. In turn, how we consume cannabis has changed dramatically within this novel legal framework.

A brief visit to a cannabis dispensary quickly illuminates just how much the industry has changed in the past few years.

Within the dynamic of modern cannabis, perhaps no vertical has seen the same advancements as cannabis extracts. It’s precisely the growth of the concentrate category that has given rise to the many branded products that define the legal market.

To give a clear picture of how advancements in extraction have stimulated the concentrate category’s growth, we put together this brief exploration.

Standards & Technology

Before legalization, the production of cannabis extracts was a shady affair done in clandestine and often dangerous ways. Especially concerning BHO (Butane Hash Oil), home-based laboratories have long since been notorious fire hazards. Even more, with a total lack of regulation, black-market extracts are infamous for containing harmful impurities.

In the few short years that cannabis has been legal in Nevada, Washington and other states, extract producers have adopted standards and technology from more professional arenas. By borrowing from the food and pharmaceutical industries, concentrate companies have achieved excellence undreamed of a decade ago.

Good Manufacturing Practices

One of the essential elements in the extracts vertical advancements is the adoption of good manufacturing practices. According to the World Health Organization website, “Good Manufacturing Practice (GMP) is that part of quality assurance which ensures that products are consistently produced and controlled to the quality standards appropriate to their intended use.”

When adult-use cannabis was legalized in markets such as Colorado, cannabis companies were able to come out of the shadows and discuss GMPs with legit businesses. In doing so, they implemented professional controls on extract manufacturing in accordance with “quality standards” of state regulatory agencies.

Supercritical CO2 Extraction

As cannabis businesses adopted GMP from other industries, extract producers also embraced more sophisticated technology. Of these, supercritical CO2 has pushed the cannabis concentrates vertical into the future.

According to the equipment manufacturer Apeks Supercritical, “CO2 is considered to be a safer method of extraction because the solvent is non-volatile. The extract is purer because no trace of the solvent is left behind. It is also versatile and helps protect sensitive terpenes, by allowing cold separation.” By deriving methods from food production, supercritical equipment manufacturers have given cannabis companies a viable option for the commercial production of extracts.

Supercritical technology has helped push the concentrates vertical forward by providing a clean and efficient way to produce cannabis extracts. Nonetheless, supercritical CO2 equipment is highly sophisticated and carries a hefty price tag. Producers can expect to pay well over $100,000 for commercial supercritical CO2 extraction setup.

Products

Just as standards and technology have evolved in the cannabis extracts vertical, we have also seen products rapidly mature. Notably, the legal environment has allowed manufacturers to exchange ideas and methods for the first time. In turn, this dialogue has led to the development of new products, like isolates and live resin.

Isolates

Just as the name implies, isolates are concentrates made from a singular, pure cannabinoid. In today’s market, CBD isolates have grown increasingly popular because people can consume pure CBD without ingesting other cannabinoids or plant materials, including the legal 0.3% THC found in hemp.

Isolates are made by further purifying cannabis extracts in the process of purification, filtration and crystallization. As seen with other concentrates, isolates are used as the base for many cannabis products, such as gummies.

There is also growing interest in CBG isolate, which is another non-psychoactive cannabinoid when consumed orally.

Live Resin

The cannabis concentrate live resin has taken the industry by storm over the past few years. Live resin is a form of extract that is originally sourced from freshly harvested and frozen cannabis plants. The primary selling point behind this extract is the fact that fresh flowers produce much more vibrant aromas and flavors than dried cannabis. Interestingly, this pungency is tied to the preservation of terpenes in live resin.

Just a few of the dozens of various products types on the market today.

To make live resin, producers “flash freeze” fresh cannabis plants immediately after harvest. Valuable cannabinoids and terpenes are then extracted from the fresh, frozen plant material using hydrocarbon solvents. This whole process is done at extremely cold temperatures, ensuring no thermal degradation to the precious and volatile terpenes.

In lieu of these intricate steps to preserve the flower and extracts, live resin has continuously gained popularity. Namely because vaping with live resin is the best way to sample fresh cannabis terpene profiles in its most authentic fashion

It is amazing to see how much cannabis extracts have grown and progressed with legalization. Due to such amazing advancements in standards, technology, and products, the concentrates category has exploded on the dispensary scene. In today’s market, flowers have been largely sidelined in favor of concentrate-based products like gummies. These products now adorn dispensary shelves in beautiful packaging replete with purity and testing specifications.

It’s an often-overlooked fact that the purity standards of the legal extracts have made reliable cannabis brands possible in the first place. You cannot develop a cannabis brand without consistent products that customers can rely on; all things considered, it can be said that advancements in extraction have not only stimulated the concentrate category but the entire industry as we know it today.

February 19, 2020

Cannabis Extracts for the Informed Consumer: Solvent or Solventless

By Nick J. Bucci

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Editor’s Note: Nick Bucci is a freelance cannabis writer. You can view his work here

As cannabis markets continue to gain traction, inconsistent and largely unpredictable markets have left recreational consumers in an informational fog. Try as the industry may, or may not to inform consumers, the lack of knowledge was evident when an established Colorado hash company opened a second operation in California. Expecting high demand for their solventless concentrates, the demand for their solvent-based counterparts came as a surprise. Initially hoping to eliminate solvent extracts from their product line-up, the company was forced to devote about half their overall production to solvent extracts, until information spreads and attitudes start to change. Over the past year several companies have joined the solventless side of history, but consumer understanding remains largely stagnant. For those immediately overwhelmed by terminology, cannabis extracts, concentrates or hash are all interchangeable terms describing concentrated cannabis. Under these umbrella terms, two distinct categories emerge depending upon whether chemical solvents were or were not used to extract the hash. Hence: solvent or solventless. A brief overview of cannabis concentrates will help consumers to understand the evolution away from solvent extractions and toward a superior solventless future.

ecxtractionfig2 — Science and economics merge when considering all the possible uses of concentrated compounds to final product formulations

Before regulated cannabis markets, cannabis extracts had long been in use. These old-world methods of cannabis extraction use very basic solventless techniques to create more potent, concentrated forms of cannabis. Dry sifting is easily the oldest form of cannabis extraction and a prime example of one solventless technique. Something as simple as shaking dried cannabis over metal screens and collecting the residue underneath creates a solventless product called keif. Dark brown bubble-hash, made popular decades ago, is another ancient technique using only ice and water to perform extractions without chemical solvents. After decades of stagnant and limited old-world methods, changes in legislation allowed cannabis sciences to flourish. These old-world hash methods were quickly forgotten, replaced by the astonishing progress of modern solvent extractions.

Tetrahydrocannabinol (THC), just one of hundreds of cannabinoids found in cannabis.

The emergence of solvent extracts revolutionized cannabis around 2011, creating new categories of cannabis products that exploded onto the scene. Not only did solvent extracts produce the most potent and cleanest forms of hash ever seen at this point, it also created new possibilities for hash-oil vape cartridges and cannabis extract infused edibles. These solvent extracts use butane, propane, or other hydrocarbon solvents to extract, or “blast” cannabinoids from the plant. By running solvents through cannabis and then purging or removing leftover, residual solvents, a super-potent, premium hash product is achieved. Regulated markets require testing to ensure only a safe level, if any, of the solvent used in the extraction process remains in the final product. This technology ushered in the first wave of concentrates to medical and recreational markets under the descriptive titles of wax, shatter and crumble. While these effective and affordable products can still be found today, far superior products have largely replaced wax and shatter. Distillation techniques can further purify and isolate THC-a, while removing harmful residual solvents. For a time, Solvent-free was used to describe this ultra-purified distillate, but the needless term has fallen out of use. Solvent-free is still a solvent extraction using chemical solvents, don’t be fooled. Distillation and CO2 extractions have fallen into general disfavor as they destroy the flavorful terpenes and valuable cannabinoids, that when present create an “entourage effect.” This “entourage effect” happens when the medicinal and recreational properties are most effective, pronounced, and impactful due to a full range of terpenes and cannabinoids being present in the final product. With companies manually reintroducing terpenes to their final extracts, it’s an attempt to restore what was lost during solvent extraction processes. Many brands claim to use cannabis derived or food-grade terpenes to infuse or reintroduce terpenes into their purified hash oils. While this adds flavor and taste, especially to distillate cartridges, it’s far from an ideal solution. Armed with this new information, the informed consumer looks for a full profile of terpenes and cannabinoids in their hash.

With terpene preservation a new priority, all aspects of hash making were reevaluated. By using fresh-frozen cannabis flower, solvent extractions quickly reached new heights. Using the same techniques as prior solvent extractions, the cannabis plant is frozen immediately upon harvesting, rather than trimming and drying the crop as usual. Freezing the plant preserves valuable terpenes helping to create a new category for hydrocarbon extracts under the general label of live resins. This live resin, containing vastly greater profiles of terpenes and cannabinoids than earlier waxes, shatters or crumbles is sold as live-resin sauce, sugar, badder, frosting, diamonds and more. Many versions of live resin re-use previous terms that describe consistencies. These live resin solvent extracts outperform the wax, crumble and shatters of old, and are priced accordingly. Some of the best solvent extracts available today use butane to extract hash oil, which forms THC-a crystals and diamonds seen in live resin sauces. Having learned the value of terpenes and cannabinoids, early efforts to purify THC were clearly misled. The industry defining use of fresh-frozen cannabis flowers greatly improved the quality of all extracts having realized the psychoactive effects are largely dependent on the various profiles of cannabinoids and terpenes. Pure THC-a crystals and isolates are easily achieved with solvent extractions but, produce inferior effects both medicinally and recreationally. Discovering the “entourage effect” as described earlier, these elements of cannabis allowed old-world solventless techniques to be re-inspired and reinvigorated with the benefit of healthy genetics and a hearty understanding of past mistakes.

Having gone full circle, solventless techniques are again at the forefront of the cannabis industry, having attained near perfection for our current understanding of cannabis anatomy.

figure1 extract — The increasingly finer mesh works to separate and extract microscopic trichomes

Using the lessons and tendencies of prior extractions, the solventless method, in all its final forms, begin with the same initial process to make ice-water hash oil. Often referred to as solventless hash oil (SHO), fresh-frozen flowers are submerged in ice and water, soaked and agitated before the water is filtered through mesh screens. As these mesh screens are measured by microns, the increasingly finer mesh works to separate and extract microscopic trichomes that break free from the cannabis plant. The 120- and 90-micron mesh screens usually collect pristine trichome heads. After scraping the remaining material from the screens, its sieved onto trays where the hash can dry using modern techniques of sublimation. The results are beyond phenomenal and are sure to shock even life-long cannabis consumers. This technique isolates only the most potent and psychoactive parts of the plant, to produce white to clear solventless ice water hash. When done with precision 6-star ice water hash is formed. The hash can be sold and consumed as is or undergo additional solventless techniques to produce hash-rosin. Not to be confused with live-resins, rosin uses pressure and slight heat to squeeze ice-water hash, into hash-rosin. Some companies have elected to whip their rosins into a solventless badder or allow their hash rosins to undergo a cold cure process that creates textures and varieties like hash rosin sauce. Regardless of the final solventless product, they all begin as ice water extractions. These simple, natural methods of extraction are quickly being adopted by companies known for live resin. As solventless extracts are safer, cleaner and superior in quality to solvent chemical extractions, the race is on as the industry shifts toward a solventless future.

While I’d be happy to never see another solvent extract again, without the miraculous breakthroughs and advances in all aspects of cannabis manufacturing and production we may have not yet arrived where we are today. When using solvents to extract, the trichomes, which contain the full spectrum of terpenes and cannabinoids, are dissolved by the solvent, which is then evaporated off, leaving behind dissolved trichomes. In solventless hash, these trichomes remain whole and are never dissolved or broken down. Instead they are broken free by agitation in ice and water, separating the trichome heads from their less-active stems. These valuable trichomes heads contain everything pertinent and are never destroyed, dissolved or melted like solvent-extractions are forced to do. The benefit of keeping the heads of these trichomes whole results in a far superior product expressing the full profile of terpenes and cannabinoids the way mother nature intended. This natural profile of trichomes lends itself directly to the entourage effect that solvent extracts were found to be missing.

Extraction techniques are not equal and depend upon whether quality or mass production is the aim. Solvent extracts have quickly begun to represent the old-guard of mass-produced cannabis concentrates, with the solventless new-guard focusing on quality, small batch, hash-rosin excellence.

December 30, 2019

How to Grow Cannabis Plants for Concentrate Production

By Andrew Myers

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While flower is still the most popular way to consume cannabis, the concentrates market is booming. Some predict concentrates will be nearly as popular as flower by 2022, with an estimated $8.5 billion in retail sales. That’s a lot of concentrates and, chances are, cannabis producers are already feeling the pressure to keep up.

Concentrates refer to products made from processing cannabis – often resulting in much higher THC or CBD percentages. The category includes oils, wax, dabs, shatter, live resin and hash. Consumers are increasingly drawn to these cannabis products for their near-immediate and intense effects. They’re often consumed through vaporization, dabbing or sublingual absorption and are sometimes favored by those who want to avoid smoking. Cannabis growers who have traditionally focused on flower yields may decide to prioritize quality and potency levels in order to tap into these changing consumer tastes.

What Growers Should Focus on to Produce High Quality Concentrates
We’ll let you in on a little secret: making good concentrates starts with good flower. If you’re starting with low-quality flower, it’s impossible to create a high-quality concentrate. Whatever qualities inherent to the flower you’re starting with will be amplified post-processing. So, really, the concentrate-making process starts at the seedling level, requiring the right care and attention to coax out the results you’re looking for.

But what makes good flower? While this can be a subjective question, those producing concentrates generally look for flowers with big, abundant trichomes. Trichomes are the small, dewy structures found across the cannabis plant on buds, leaves and even the stem. They’re responsible for producing the plant’s cannabinoids and terpenes – the chemical compounds that give a strain its unique benefits, aroma and taste. Evolutionarily, trichomes attract pollinators, deter hungry herbivores and provide some defense against wind, cold and UV radiation.

Generally, trichomes indicate how potent the flower is. Plus, what we’re most often looking for when making concentrates is higher cannabinoid and terpene profiles, while also ensuring absolute safety.

What measures can growers take to produce crops that are ideal for concentrate production? Start with the following:

Avoiding Contaminants
Just like you would wash your fruits and vegetables before consumption, consumers want to be sure there’s no dangerous residuals in the concentrate they are ingesting. Growers can avoid any post-process residuals by taking a few key steps, including:

Photo: Michelle Tribe, Flickr

Cutting out the pesticides. Any pesticides that are on your flowers before they go through processing will show up in your concentrates, often even more – you guessed it – concentrated. This is a serious health concern for consumers who might be sensitive to certain chemicals or have compromised immune systems. It’s dangerous to healthy consumers, too. Rather than spraying hazardous chemicals, growers could consider integrated pest management techniques, such as releasing predatory insects.
Limiting foliar spraying. Some growers will use foliar spraying to address nutrient deficiency or pest-related issues through delivering nutrients straight to the leaves. However, this can also result in contaminated concentrates. If you really need to spray, do it during the vegetative stage or investigate organic options.
Taking the time to flush the crop. This is a critical step in reducing potential contaminants in your concentrate, especially if you’re using a non-organic nutrient solution or fertilizer. Flushing simply means only giving your plants water during the final two weeks of flowering before harvest, resulting in a cleaner, non-contaminated flower and therefore a cleaner concentrate.

Perfecting the Indoor Environment
When cultivating cannabis indoors, growers are given ultimate control over their crop. They control how much light the plants receive, the lighting schedule, temperature and humidity levels. Creating the ideal environment for your cannabis crop is the number one way to ensure healthy plants and quality concentrates. There are many factors to consider when maintaining an indoor grow:

Temperature regulation. Trichomes are sensitive to temperature changes and start to degrade if they’re too hot or too cold. To maintain the best trichome structure, you’ll want to maintain an ideal temperature – for most strains, this falls between an idyllic 68 and 77 degrees.
Adequate light. For plants to perform photosynthesis indoors, they’ll need an appropriate light source – preferably one that is full-spectrum. Full-spectrum LEDs are able to closely replicate the sun and provide ample, uniform light to your crop. Another selling point for LEDs is their low heat output, making it much easier for growers to regulate ambient heat.
Rows of cannabis plants drying and curing following harvest
CO2. Another necessary ingredient for photosynthesis is CO2. Providing your indoor crops with CO2 can boost plant size and yields and, therefore, provides more surface area for trichomes to develop and thrive.
Cold snap prior to harvest. Some growers rely on this age-old tactic for one last push before harvest – lowering their temperature for a few days right at the end of the flower cycle. They believe this puts the plants into a defense mode and will produce more trichomes in order to protect themselves.

Following Best Practices Post-Harvest
You made it to harvest – you’re almost done!

When harvesting and storing your plants, handle them with care to reduce damage to trichomes. If you’re planning on immediately making concentrates, you can move forward to the drying and curing process. If you’re going to wait a few weeks before processing, freeze your plants. This will preserve the cannabinoid and terpene profiles at their peak.

As the cannabis industry continues to expand, more consumers are likely to reach for concentrates at their local dispensaries. It makes sense that businesses want to diversify their offerings to satisfy customers looking for the most effective way to consume cannabis. As with any cannabis-derived product, producers will want to prioritize quality and safety – especially in the concentrate market.

May 4, 2016

AOCS Highlights Cannabis Lab Standards, Extraction Technology

By Aaron G. Biros

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The American Oil Chemists’ Society (AOCS) held its annual conference in Salt Lake City this week, with a track focused on cannabis testing and technology. Cynthia Ludwig, director of technical services at AOCS and member of the advisory panel to The Emerald Test, hosted the two-day event dedicated to all things extraction technology and analytical testing of cannabis.

Highlights in the discussion surrounding extraction technologies for the production of cannabis concentrates included the diversity of concentrate products, solvent selection for different extraction techniques and the need for cleaning validation in extraction equipment. Jerry King, Ph.D., research professor at the University of Arkansas, began the event with a brief history of cannabis processing, describing the physical morphologies in different types of extraction processes.

J. Michael McCutcheon presents a history of cannabis in medicine

Michael McCutcheon, research scientist at Eden Labs, laid out a broad comparison of different extraction techniques and solvents in use currently. “Butane is a great solvent; it’s extremely effective at extracting active compounds from cannabis, but it poses considerable health, safety and environmental concerns largely due to its flammability,” says McCutcheon. He noted it is also very difficult to get USP-grade butane solvents so the quality can be lacking. “As a solvent, supercritical carbon dioxide can be better because it is nontoxic, nonflammable, readily available, inexpensive and much safer.” The major benefit of using supercritical carbon dioxide, according to McCutcheon, is its ability for fine-tuning, allowing the extractor to be more selective and produce a wider range of product types. “By changing the temperature or pressure, we can change the density of the solvent and thus the solubility of the many different compounds in cannabis.” He also noted that, supercritical carbon dioxide exerts tremendous pressure, as compared to hydrocarbon solvents, so the extraction equipment needs to be rated to a higher working pressure and is generally more expensive.

John A. Mackay, Ph.D., left at the podium and Jerry King, Ph.D., on the right

John A. Mackay, Ph.D., senior director of strategic technologies at Waters Corporation, believes that cannabis processors using extraction equipment need to implement cleaning SOPs to prevent contamination. “There is currently nothing in the cannabis industry like the FDA CMC draft for the botanical industry,” says Mackay. “If you are giving a child a high-CBD extract and it was produced in equipment that was previously used for another strain that contains other compounds, such as CBG, CBD or even traces of THC extract, there is a high probability that it will still contain these compounds as well as possibly other contaminants unless it was properly cleaned.” Mackay’s discussion highlighted the importance of safety and health for workers throughout the workflow as well as the end consumer.

Jeffrey Raber, Ph.D., chief executive officer of The Werc Shop, examined different testing methodologies for different applications, including potency analyses with liquid chromatography. His presentation was markedly unique in proposing a solution to the currently inconsistent classification system for cannabis strains. “We really do not know what strains cause what physiological responses,” says Raber. “We need a better classification system based on chemical fingerprints, not on baseless names.” Raber suggests using a chemotaxonomic system to identify physiological responses in strains, noting that terpenes could be the key to these responses.

Cynthia Ludwig welcomes attendees to the event.

Dylan Wilks, chief scientific officer at Orange Photonics, discussed the various needs in sample preparation for a wide range of products. He focused on sample prep and variation for on-site potency analysis, which could give edibles manufacturers crucial quality assurance tools in process control. Susan Audino, Ph.D., chemist and A2LA assessor, echoed Wilks’ concerns over sample collection methods. “Sampling can be the most critical part of the analysis and the sample size needs to be representative of the batch, which is currently a major issue in the cannabis industry,” says Audino. “I believe that the consumer has a right to know that what they are ingesting is safe.” Many seemed to share her sentiment about the current state of the cannabis testing industry. “Inadequate testing is worse than no testing at all and we need to educate the legislators about the importance of consumer safety.”

46 cannabis laboratories participated in The Emerald Test’s latest round of proficiency testing for potency and residual solvents. Cynthia Ludwig sits on the advisory panel to give direction and industry insights, addressing specific needs for cannabis laboratories. Kirsten Blake, director of sales at Emerald Scientific, believes that proficiency testing is the first step in bringing consistency to cannabis analytics. “The goal is to create some level of industry standards for testing,” says Blake. Participants in the program will be given data sets, judged by a consensus mean, so labs can see their score compared to the rest of the cannabis testing industry. Proficiency tests like The Emerald Test give labs the ability to view how consistent their results are compared to the industry’s results overall. According to Ludwig, the results were pleasantly surprising. “The results were better than expected across the board; the vast majority of labs were within the acceptable range,” says Ludwig. The test is anonymous so individual labs can participate freely.

The AOCS cannabis working groups and expert panels are collaborating with Emerald Scientific to provide data analytics reports compliant with ISO 13528. “In the absence of a federal program, we are trying to provide consistency in cannabis testing to protect consumer safety,” says Ludwig. At the AOCS annual meeting, many echoed those concerns of consumer safety, proposing solutions to the current inconsistencies in testing standards.