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The comparative aroma extract dilution analysis (cAEDA) applied to the volatile fractions of two types of fresh mint leaves (Peppermint and Spearmint) revealed 20 odor-active peaks with high FD factors (≥64). Among the perceived odorants, five “sweet/milky” and “caramel-like/spicy” notes showing high FD factors were characteristic for the peppermint aroma, and were identified as p-menthane lactone derivatives. Especially, the three p-menthane lactone derivatives, “rel-(3S,3aS,6R,7aS)-dihydromintlactone, (3S,3aS,6R)-epoxymenthofurolactone, and 2E-ethylidene-5-methylcyclohexanone”, were newly identified compounds in the peppermint. The biosynthetic routes of the p-menthane lactone derivatives have been suggested to be closely related to menthofuran. Therefore, these findings strongly suggest the possibility that the biosynthetic pathway leading to the p-menthane lactone derivatives via menthofuran plays a significantly important role in the formation of the characteristic aroma of peppermint.

Identification of the novel odor active compounds “p-menthane lactones” responsible for the characteristic aroma of fresh peppermint leaf