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|Section2= |Section3= }} 6-Nonenal is an organic compound with the formula C2H5CH=CH(CH2)4CHO. Other isomeric nonenals are also known to exist naturally, e.g. 2-nonenal. The ''cis''-isomer of 6-nonenal is often listed as the principal component in the aromas of muskmelon fruits. The ''trans''-isomer is listed as an off-flavor aroma of milk foams, and thought to be a possible polypropylene odorant. ==Biosynthesis== 6-Nonenal is thought to be synthesized in nature from γ-lineolenic acid through a lipoxygenase system. The lipoxygenase system cleaves carbon-carbon double bonds into hydroperoxides, which can be cleaved by hydroperoide lysase into the corresponding ''cis''-aldehydes. The rationale behind this mechanism is due to the observed odor properties of muskmelons based on air exposure. In the ripe, unmodified muskmelon there are small concentrations of ''cis''-6-nonenal. A large increase in the concentration of 6-nonenal is noticed when the cells are lysed and exposed to air. This is attributed to enzymatic activity of hydroperoxide lysases when exposed to a high oxygen environment not present in the cells. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「6-Nonenal」の詳細全文を読む スポンサード リンク
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