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. Solubility Expand the full text Volatile oil is insoluble in water, but soluble in various organic solvents, such as petroleum ether, ether, carbon disulfide, grease and so on. It can be completely dissolved in high concentration ethanol,molecular distillation systems, while only a part of it can be dissolved in low concentration ethanol. 4. Physical constants Most of the volatile oils are lighter than water, and some are heavier than water (such as clove oil and cinnamon oil). The relative density is generally between 0.85 and 1.065; almost all of them have optical activity; and most of them have strong refractive index. The boiling point of volatile oil is generally between 70 ℃ and 300 ℃. 5. Stability It is easy to oxidize and deteriorate when exposed to light, air and heating. Volatile oil will gradually oxidize and deteriorate after frequent contact with air and light, which will increase the relative density of volatile oil, darken its color, lose its original fragrance and form resin-like substances, which can not be distilled with water vapor. Therefore, the method of preparing volatile oil should be appropriate, and the product should be sealed in a brown bottle and stored at low temperature. 6. Chemical properties Volatile oil often contains double bonds, alcoholic hydroxyl groups, aldehydes, ketones,wiped film distillation, acidic groups, lactones and other structures, so it can react with bromine and sodium bisulfite, condensation reaction with hydrazine,  Oils and fats generally have the property of absorbing volatile oil, which is often used to extract valuable volatile oil, rotovap distillation ,decarboxylation after extraction, such as rose oil, jasmine oil and so on. There are two kinds of absorption methods, namely cold absorption method and warm immersion absorption method. The mass spectrometer detects and analyzes the structure of each component to obtain the mass spectrum of each component, and the possible structure of the compound can be given by comparing the computer with the standard spectrum of the database,jacketed glass reactor, and can also be confirmed by referring to relevant literature data, thereby greatly improving the speed and research level of analysis and identification of volatile oil. In addition, the advent of multi-stage mass spectrometry (MSn) provides a new way for the qualitative and quantitative analysis of complex volatile oils. Return to Sohu to see more Responsible Editor:. toptiontech.com