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Cannabis flower essential oil

Essential oil obtained from the hemp plant

Cannabis flower essential oil, also known as hemp essential oil, is an essential oil obtained by steam distillation from the flowers, panicles (flower cluster), stem, and upper leaves of the hemp plant (Cannabis sativa L.). Hemp essential oil is distinct from hemp seed oil (hemp oil) and hash oil: the former is a vegetable oil that is cold-pressed from the seeds of low-THC varieties of hemp, the latter is a THC-rich extract of dried female hemp flowers (marijuana) or resin (hashish).

A pale yellow liquid, cannabis flower essential oil is a volatile oil that is a mixture of monoterpenes, sesquiterpenes, and other terpenoid compounds. Beyond terpenes, there exist a number of other minor compounds that can drastically influence the aroma, such as volatile sulfur compounds, esters, and the heterocyclic compounds indole and skatole. The essential oil is manufactured from both low-THC ("fibre-type") and high-THC ("drug-type") varieties of hemp. As most of the phytocannabinoids are nearly insoluble in water, hemp essential oil contains only traces of cannabinoids. Most of the material is produced in Canada, as well as small scale cultivations in Switzerland and Germany.

Hemp essential oil is used as a scent in perfumes, cosmetics, soaps, and candles. It is also used as a flavoring in foods, primarily candy and beverages.

Constituents

Another report said there were 140 terpenoids, dominated by α-pinene and limonene which together often comprise 75% of the live plant's volatiles. However, extracted essential oils can change in composition, and the live plant, dried plant and essential oil can smell rather different.

Compound	Chemical
structure	% of total
Myrcene	[[Image:Myrcene beta acsv.svg	60px]]	29.4–65.8
α-Pinene	[[Image:Alpha-pinen.svg	75px]]	2.3–31.0
β-Pinene	[[Image:Beta-pinen.svg	75px]]	0.9–7.8
delta-3-Carene	[[Image:(+)-3-carene.svg	110px]]	trace–3.5
Limonene	[[Image:Limonene-2D-skeletal.svg	50px]]	0.2–6.9
β-phellandrene	[[Image:Phellandrene beta.svg	60px]]	0.2–0.6
cis-Ocimene	[[Image:Ocimene - cis.png	140px]]	trace–0.3
trans-Ocimene	[[Image:Ocimene.png	160px]]	0.3–10.2
α-Terpinolene	[[File:terpinolene.svg	50px]]	trace–23.8
α-Bergamotene	[[File:α-bergamotene.svg	150px]]	trace–0.8
trans-Caryophyllene	[[Image:Caryophyllene.svg	130px]]	3.8–37.5
α-Humulene	[[Image:Humulene.png	130px]]	0.7–7.4
β-Farnesene	[[Image:B-Farnesene.svg	180px]]	trace–1.4
β-Selinene	[[File:Beta-selinene.svg	140px]]	trace–0.5
Selina-3,7(11)-diene		trace–0.7
Caryophyllene oxide	[[File:Caryophyllene oxide.svg	100px]]	trace–11.3
Total monoterpenes		47.9–92.1
Total sesquiterpenes		4.0–47.5

Uses

The various terpenes in cannabis have antifungal, antimicrobial, antiviral and insect repellent functions that could be commercially valuable when used externally.

Cannabis essential oils that are cannabinoid-free have been tested for central nervous effects. Natural monoterpenes and sesquiterpenes from cannabis flowers have relaxing, sedative and anti-depressant effects when inhaled. Their application in aromatherapy is increasing, but the high price of the natural oil (50$ per milliliter) is a limiting factor.

In Switzerland and Austria, specific landraces with high essential oil content but no discernible amounts of cannabinoids have been developed for the purpose of flavoring beverage products. For those applications, oils with high monoterpene percentages (but a low alpha-humulene or caryophyllene oxide concentration) are desirable.

Terpenes used in THC vaping products, legal in some jurisdictions in the United States, are not true cannabis terpenes, but synthetic and racemic with potential health hazards. Due to health promoting effects, natural THC-free cannabis flower oil is the preferred ingredient in the legal European market. Unregulated additives in US vaping products have led to serious health consequences, including fatal outcomes.

References

Sources

References

(2005). "Steam Distillation of Essential Oils from Hemp Panicles". Journal of Natural Fibers.
Winstock, Adam R.. (2012-01-01). "29 - Psychoactive drug misuse". W.B. Saunders.
(2021-11-30). "Identification of a New Family of Prenylated Volatile Sulfur Compounds in Cannabis Revealed by Comprehensive Two-Dimensional Gas Chromatography". ACS Omega.
(2023-10-12). "Minor, Nonterpenoid Volatile Compounds Drive the Aroma Differences of Exotic Cannabis". ACS Omega.
(1997). "Essential oil of Cannabis sativa L. strains". Journal of the International Hemp Association.
(2019). "Yield and Quality of Essential Oils in Hemp Varieties in Different Environments". Agronomy.
(2018). "Cannabis Essential Oil: A Preliminary Study for the Evaluation of the Brain Effects". Evid Based Complement Alternat Med.
[https://www.about-drinks.com/cswiss-der-cannabis-eistee/ CSWISS – der Cannabis Eistee.] aboutdrinks.com. Retrieved September 1st 2019.
Mediavilla V. & Steinemann S. [http://www.internationalhempassociation.org/jiha/jiha4208.html Essential oil of Cannabis sativa L. strains]. Swiss Federal Research Station for Agroecology and Agriculture, Zurich. Retrieved September 1st 2019.
"E-cigarettes: Facts, stats and regulations".

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