t has been known for centuries that codistillation of many plant materials with steam(called steam distillation produces a fragrant mixture of liquids known as plant essential oils These compounds have had a variety of uses, particularly in early medicine and in the making of perfumes
◼ It has been known for centuries that codistillation of many plant materials with steam (called steam distillation) produces a fragrant mixture of liquids known as plant essential oils. ◼ These compounds have had a variety of uses, particularly in early medicine and in the making of perfumes
Chemically, the essential oils of plants consist largely of mixtures of lipids called terpenes a Terpenes are small organic molecules that have an immense diversity of structure. Thousands of different terpenes are known; some are hydrocarbons and others contain oxygen; some are open chain molecules, and others contain rings
◼ Chemically, the essential oils of plants consist largely of mixtures of lipids called terpenes. ◼ Terpenes are small organic molecules that have an immense diversity of structure. Thousands of different terpenes are known; some are hydrocarbons, and others contain oxygen; some are openchain molecules, and others contain rings
Some terpenes isolated from essential oils Myrcene(oil of bay)a-Pinene(oil of turpentine) 月桂烯 α-蒎烯 Carvone(oil of spearmint) 香芹酮
Some terpenes isolated from essential oils Myrcene (oil of bay) -Pinene (oil of turpentine) O Carvone (oil of spearmint) 月桂烯 -蒎烯 香芹酮
According to the isoprene rule proposed by Ruzicka, terpenes can be considered to arise from head-to-tail joining of simple five-carbon Isoprene unIts. CH3 CH2-C-CH-CH Head Isoprene Tail 2-Methyl-1, 3-butadiene Tail Head rene Head Pinene
◼ According to the isoprene rule proposed by Ruzicka, terpenes can be considered to arise from head-to-tail joining of simple five-carbon isoprene units. CH2 C CH CH3 CH2 1 2 3 4 Isoprene 2-Methyl-1,3-butadiene Head Tail Tail Head Myrcene Tail Head -Pinene
Classification of Terpenes Carbon atoms I Isoprene units Classification 10 Monoterpenes 15 Sesquiterpenes 20 25 30 234568 Diterpenes Sesterterpenes Triterpenes 40 Tetraterpenes
Classification of Terpenes Carbon atoms Isoprene units Classification 10 2 Monoterpenes 15 3 Sesquiterpenes 20 4 Diterpenes 25 5 Sesterterpenes 30 6 Triterpenes 40 8 Tetraterpenes
β- Pinene Camphene Limonene β-蒎烯 莰烯 苧烯 β- Caryophyllene β-石竹烯
-Pinene Camphene Limonene -蒎烯 莰烯 苧烯 -Caryophyllene -石竹烯