Biotransformation of monoterpenoids, (-)-and (+)-menthols, terpinolene and carvotanacetone by Aspergillus species
1991
Asakawa, Y. | Takahashi, H. | Toyota, M. | Noma, Y.
Four monoterpenoids, (-)- and (+)-menthols, terpinolene and carvotanacetone were biotransformed by Aspergillus niger and several related species. Aspergillus niger converted (-)-menthol to 1-, 2-, 6-, 7-, and 9-hydroxymenthols and the mosquito repellent-active 8-hydroxymenthol. On the other hand, (+)-menthol was smoothly biotransformed by A. niger to give 7-hydroxymenthol. Aspergillus cellulosae biotransformed (-)-menthol specifically to 4-hydroxymenthol. Terpinolene and (-)-carvotanacetone were converted by A. niger to two alpha, beta-unsaturated ketones, a fenchane-type compound and diastereoisomeric p-menthane-2,9-diols and 8-hydroxycarvomenthol, respectively.
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