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Chemical Composition of Essential Oils and Storage Tips for Base Oils

Ⅰ. The chemical composition of essential oils

Essential oils are mixtures of various types of compounds, including aliphatic compounds, aromatic compounds, but more terpenoid derivatives.

1. Aliphatic compounds: There are hydrocarbons, alcohols, aldehydes, ketones, esters, etc., which are widely found in plants, especially fruits. Such as n-propanol, octanal, ethyl acetate, formic acid, ethyl octanoate, etc.

2. Terpenoids: The basic structure of terpenoids is mostly isoprene, with the general formula of (C5H8)n. C10H16 is called monoterpenes, C15H24 is called sesquiterpenes, C20H32 is called diterpenes, compounds composed of 6 or 8 isoprenes are called triterpenes and tetraterpenes, respectively, and are composed of more isopentyl compounds composed of dienes are called polyterpenes.

The terpenes in volatile oil are mainly monoterpenes and sesquiterpenes. Polyterpenes do not exist in volatile oils, but are components of certain resins, pigments, rubber, etc. Terpenoids in volatile oils can be oxygenated or non-oxygenated. For most volatile oils, oxygen-free hydrocarbons account for a large amount, but most of them have no suitable aroma and are not important components. Oxygen-containing derivatives include alcohols, aldehydes, ketones, ethers, acids, phenols, esters, etc. Although the content is small, most of them have excellent aromatic gas and are important components in volatile oils.

Ⅱ. The preservation of essential oils and base oils

1. Store in a dark glass bottle

Avoid sun exposure. High-intensity fluorescent lamps and light bulbs should also avoid exposure to essential oils. Essential oils must be stored in dark glass bottles to avoid direct damage from ultraviolet rays in the light.

2. Storage temperature

Put it in a cool and ventilated place. The proper storage temperature for essential oils is room temperature between 18°C and 28°C, and the optimal temperature is about 25°C. Essential oils are easy to deteriorate in places with too large temperature difference. At the same time, avoid places that are too humid and hot.

3. Tighten the cap after use

After opening the essential oil, after each use, the bottle cap should be tightened, otherwise it will be easily oxidized and deteriorated if exposed to the air for too long. After opening the bottle, try to use it up within 1 year. If it has been blended into massage oil, it is best to use it up within 1 month.

4. Avoid storing in the refrigerator

Think putting it in the refrigerator is the best way to avoid excessive temperature fluctuations? This kind of thinking is wrong. Essential oils are very sensitive. Take them out of the refrigerator and put them back after use, which will make the essential oils in a state of great temperature fluctuations and instability, which will make the essential oils easy to deteriorate, so they should not be stored in the refrigerator. 

5. Store it out of reach of children

Pure essential oils should not be taken by children themselves, so as not to cause harm due to misuse.

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