想知道茶油的结构式,急!
Tea tree
General: The best known and economically most important species is the Australian Tea tree (Melaleuca alternifolia) (R. Saller etal. 1998). Tea tree oil obtained by steam distillation of the leaves of the above plant is widely used in aromatherapy and in cosmetics.
Constituents: Tea tree oil is a complex mixiture of approximately 100 compounds. It contains mainly alpha-terpinene-4-ol (ca. 40%).There are also small amounts of closely related monoterpenes, e.g., alpha-terpinene (10%), gamma-terpine ( 20%), terpinolene,alpha-phellandrene, p-cymene, limonene, beta-phellandrene and 1,8-cineole as well as the sesquiterpnes, aromadendrene,viridiflorene and delta-cadinene (R. Saller etal. 1998). There is a large natural variation in oil composition with the concenteration of two significiant components, terpine-4-ol and 1,8-cineole being inversily proportional to each other (S.D. Cox et al, 1997).
Steam distillation of tea tree (Melaleuca alternifolia) oil
Abstract
The steam distillation of tea tree (Melaleuca alternifolia Cheel) oil was investigated in a small batch still to ascertain the effect of operating variables on the yield, composition and rate of recovery of oil. Provided suitable distillation times (2-3 h) were used, the oil yield and composition did not vary with steam rate or pretreatment of the leaves by maceration. However, the rates of recovery of individual oil components were markedly affected.
The results demonstrate that the oil components can be divided into two main groups according to their distillation behaviour. Oxygenated components, particularly terpinen-4-ol and 1,8-cineole, are recovered the most rapidly, despite their high boiling points relative to other components. Their rates of recovery are increased with increasing steam rate, but are insensitive to leaf maceration. A second group of components, characterised by either a hydrophobic structure (the monoterpenes) or a larger molecular size (sesquiterpenes), exhibited the opposite behaviour. The rates of recovery of these components were unaffected by steam rate and improved by leaf maceration. It is hypothesised that the rate-limiting processes for oxygenated and hydrophobic components are different. For the former, recovery is mass-transfer film controlled, whereas the latter are diffusion controlled. This understanding provides the basis for manipulating oil quality by process conditions.
tea tree oil (review)
有没有中文的?看不
懂
茶油是一个混合物，主要由油酸、亚油酸、亚麻酸等不饱和脂肪酸组成。
你要想知道它的结构式，那只要知道其中各主要成分的结构式即可。
江西金海棠药用油有限公司生产：
药用茶油
注射用茶油
药用大豆油
注射用大豆油。
可与他们联系。
Tea tree
General: The best known and economically most important species is the Australian Tea tree (Melaleuca alternifolia) (R. Saller etal. 1998). Tea tree oil obtained by steam distillation of the leaves of the above plant is widely used in aromatherapy and in cosmetics.
Constituents: Tea tree oil is a complex mixiture of approximately 100 compounds. It contains mainly alpha-terpinene-4-ol (ca. 40%).There are also small amounts of closely related monoterpenes, e.g., alpha-terpinene (10%), gamma-terpine ( 20%), terpinolene,alpha-phellandrene, p-cymene, limonene, beta-phellandrene and 1,8-cineole as well as the sesquiterpnes, aromadendrene,viridiflorene and delta-cadinene (R. Saller etal. 1998). There is a large natural variation in oil composition with the concenteration of two significiant components, terpine-4-ol and 1,8-cineole being inversily proportional to each other (S.D. Cox et al, 1997).
Steam distillation of tea tree (Melaleuca alternifolia) oil
Abstract
The steam distillation of tea tree (Melaleuca alternifolia Cheel) oil was investigated in a small batch still to ascertain the effect of operating variables on the yield, composition and rate of recovery of oil. Provided suitable distillation times (2-3 h) were used, the oil yield and composition did not vary with steam rate or pretreatment of the leaves by maceration. However, the rates of recovery of individual oil components were markedly affected.
The results demonstrate that the oil components can be divided into two main groups according to their distillation behaviour. Oxygenated components, particularly terpinen-4-ol and 1,8-cineole, are recovered the most rapidly, despite their high boiling points relative to other components. Their rates of recovery are increased with increasing steam rate, but are insensitive to leaf maceration. A second group of components, characterised by either a hydrophobic structure (the monoterpenes) or a larger molecular size (sesquiterpenes), exhibited the opposite behaviour. The rates of recovery of these components were unaffected by steam rate and improved by leaf maceration. It is hypothesised that the rate-limiting processes for oxygenated and hydrophobic components are different. For the former, recovery is mass-transfer film controlled, whereas the latter are diffusion controlled. This understanding provides the basis for manipulating oil quality by process conditions.
tea tree oil (review)
有没有中文的?看不
懂
茶油是一个混合物，主要由油酸、亚油酸、亚麻酸等不饱和脂肪酸组成。
你要想知道它的结构式，那只要知道其中各主要成分的结构式即可。
江西金海棠药用油有限公司生产：
药用茶油
注射用茶油
药用大豆油
注射用大豆油。
可与他们联系。