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The Chemistry of Essential Oil is a fascinating subject for me as I have always been a science buff.
But for those who don't love chemistry, I will show you why it will be worth learning a little bit or at least having an understanding! This particularly holds true if you are interested in blending or mixing essential oils.
Why should I Learn Essential Oils Chemistry?
Here are my top reasons for teaching you essential oils chemistry!
What are the Main Groups of Compounds in Essential Oils?
There are two main groups of essential oil constituents that define the chemistry of essential oil. They are hydrocarbons and oxygenated compounds. These are further subdivided into sub-groups that are listed below.
Monoterpenes – are present in almost all essential oils. Monoterpenes also enhance the therapeutic values of other components and are the balancing portion of the oil. They all contain the functional group C10H16.
What Essential oils that have a High Percentage of Monoterpenes?
Sesquiterpenes – Are present in almost all essential oils. The chemistry of essential oils tells us that they are the largest group of terpenes known naturally in the plant and animal kingdom!
They are larger than monoterpenes and are very viscous (less volatile) so they are often used as fixatives in the perfume industry. Viscous oils have a longer half-life and blend well with lighter, more volatile oils.
What Essential oils that have a High Percentage of Sesquiterpenes?
Phenolics – Clean receptor sites of cells. They typically have a high level of oxygenating molecules.
What Essential oils that have a High Percentage of Phenolics?
Alcohols – have a high resistance to oxidation.
What Essential oils that have a High Percentage of Alcohols?
Esters – result from the reaction of an alcohol with an acid. They are the most relaxing, calming and balancing of all the essential oil constituents.
What Essential oils that have a High Percentage of Esters?
Aldehydes – are responsible for all the delightful fragrance of essential oils! They are calming to the nervous system. They are best known to relieve stress and promote relaxation.
Ketones – are not as prevalent as monoterpenes and alcohols. They have distinctive fragrances and are calming and sedative. They also support cell regeneration.
Oxides – are derived from other compounds such as alcohols, terpenes or ketones which have been oxidized. They are can be mildly stimulating. 1,8-cineol or eucalyptol is the most prevalent member of the oxide family and it is many plants!
Are there any other Classes of Compounds in Essential Oils?
There are other classes of compounds that are not discussed here but essential oils can contain small amounts of them. They are not the dominant classes; they are usually 20% or less. These are: Alkanes, Ethers, Carboxylic Acids, Lactones, Coumarins and Furanoids.
And most of these sub-groups can be broken down further into specific compounds. From there you can really see the total chemistry profile of the essential oil. And honestly it is quite interesting to look at!
Can you give an Example of an Essential Oil Chemistry Profile?
Yes, for example, one of the benefits of grapefruit is that it contains 86-92% d-limonene! D-limonene is a highly regarded antioxidant qualitites when taken internally as a dietary supplement, and is a monoterpene.
Grapefruit contains 90-95% monoterpenes, 3-8% Tetraterpenes, 1-3% Aldehydes, and less than 3% Furanocoumarins, Sesquiterpenones, Alcohols and Thiols.
So as we can see from the chemistry of essential oil that Grapefruit is a detoxifier, has cleansing properties because it is a mostly made of monoterpenes!
Even though I only provided an overview of the chemistry of essential oil, I hope you can see now how it connects to knowing more about your oil.
From the viscosity, volatility and medicinal properties, the chemistry profile can tell you a lot about the plant and your oil. Always consider the safety of essential oils as well.
David Stewart's book The Chemistry of Essential Oils (Made Simple) is a fantastic reference for you to have on hand. It will teach you chemistry simply and all the profiles and common and scientific names of your plants are contained in there as well. I highly recommend the book!
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