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Sesamin is a natural endogenous anti-oxidant substance extracted from the seeds of the sesame plant of the flax family. It is white crystalline powder if the content more than 90%。Specific rotation is[α]D20+64.5°. Melt point is 125～126℃.It is easily soluble in chloroform, benzene, acetic acid, acetone, slightly soluble in ether and petroleum ether. Almost insoluble in water, alkaline solution and hydrochloric acid. Sesamin used in nutrition foods and medicines is dextrorotatory and extracted.