Add time:08/16/2019 Source:sciencedirect.com
Thea sinensis; Theaceae; tea; cis-3-hexenal: leaf aldehyde; leaf alcohol; linolenic acid; biosynthesis of leaf alcohol.Linolenic acid and cis-3-hexenal were found in macerated leaves of Thea sinensis and this aldehyde may be produced from linolenic acid by an enzyme contained in macerated leaves in the presence of oxygen. This aldehyde was easily isomerized to trans-2-hexenal, and was converted to cis-3-hexenol by alcohol dehydrogenase. During maceration of freshly picked tea leaves, the amounts of trans-2-hexenal quickly increased and were influenced by maceration time, heating, oxygen and the pH. But in unpicked tea leaves the occurrence of trans-2-hexenal is extremely doubtful.
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