On the shelf of all dispensaries these days are a series of products that most cannabis users have never tried. They go by weird names like budder or wax.
Just what are cannabis concentrates and how does it differ from regular marijuana? Is it stronger and how is it made.
First a bit of bio-chem background. Marijuana is a collection of 3 major chemical types
- Tetrahydrocannabinol (Δ9-THC) – This is the main psychoactive ingredient in cannabis.
It has two major related substances including THCA which converts to THC when heated. This is what bonds to the cannabinoid receptors in the brain and is what gets users “high” (and paranoid…but more of that later)
- Cannabidiol. The two other major compounds found in cannabinoids are cannabidiol (CBD) and, once a sample has been aged, cannabinol (CBN). These are compounds that have been studied medicinally and have been shown to have medical benefits as far reaching as reductions in symptoms related to anxiety and nausea to seizure disorders. There are about 60 other compounds in the cannabinoid family that will reveal medical properties for years.
- Terpines – this is the mixture of about 60 or so different compounds that produce that unique smell of cannabis that can range wildly from strain to strain. They are only present in small amounts. One strain can smell of blueberry while another smells like lemon while yet another smells like pines. Alpha-Pinene and Beta-Pinene are what gives some strains that pine smell. Those terpines have properties as an antiseptic and memory retention but the neat thing about them is that they bind to the same receptors as THC does in the brain and are thought to partially counteract the effects of THC
Okay, chemistry lesson over. Now on to concentrates
Since the 70’s, cannabis growers have been breading plants to have more of the characteristics that users want to see – namely THC. It is common to see strains with THC upwards of 23%. What concentrates do it take it to the next level and after processing the cannabis can see THC levels as high as 80-90%.
How to they do that?
There are a couple of different methodologies for creating concentrates but I’m going to focus on producing concentrates with a solvent – Butane and CO2.
In the most simplistic terms – a solvent is used to dissolve the desired molecules (namely THC and Cannabinoids) and then a process is used to get rid of the solvent – leaving behind as much of the desired THC and Cannabinoids in a concentrated form.
A common method to do this is by using butane. Butane as a liquid is soluble for the THC and Cannabinoids to grab onto and ride away from the rest of the plant material. After the liquid leaves the butane chamber it is left so that the butane will evaporate. There is some risk as many brands of butane contain impurities that will remain in the end product and can leave a distinct taste but it is inexpensive and how the majority of grey or blackmarket solvent based concentrates are made.
Another method (and my preferred) is by using CO2 as the solvent. CO2 under pressure and at certain temperatures can be tuned to remove different profiles including THC and Cannabinoids and is a liquid. CO2 is food safe and is a process used widely in the food industry for decaffeinating coffee for instance.
Both of those methods produce a result that is similar – An extract from the marijuana plant that is almost entirely made up of THC with a few fats, terpenes and waxes that remain. Here is where the post processing takes place and differentiates Shatter from Budder.
Budder takes this concentrated material that you’ve extracted from the plant and lets it dry. As the gas escapes it creates honeycomb like features in the concentrate when the THC molecules start to crystallize. Some producers will even stir the mixture to add in additional air bubbles.
The consistency of the budder will depend on a few things including the texture of the incoming oil and if the process to remove contaminants (in the case of Butane you are removing Butane molecules and in the case of CO2, you are removing water). The end product can resemble a crumbly material (often called crumble or honeycomb) or a gooey wax called budder. Budder can contain up to 80% of the material being THC and Cannabinoids (the amount of each is dependent on the strain but most budder around 70%-80% THC and less than 1% CBD.
Shatter takes this product that remains at the end of the extraction process and uses a couple of different methodologies to remove the waxes and lipids that remain. This process is called winterization. It involves dissolving the extract in ethanol. Once the liquid is cooled, it will precipitate out the unwanted waxes and lipids leaving you with a pure cannabinoid (THC and CBD)/terpenoid mixture . The end product is placed in a vacuum oven to remove the remaining moisture and what is left is a clear sheet of amber that will shatter at room temperature. THC levels in Shatter can reach in the mid to high 80s.
Those are two of the major cannabis concentrates that are seen in the market today. Next time I will write about the different types of oils that can be formulated from cannabis extracts.