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Abstract
A number of yeast species can transform ricinoleic acid into γ-decalactone, a high-value compound with fruity aroma, through β-oxidation. This study investigated the effect of l-carnitine on γ-decalactone production by Saccharomyces cerevisiae MF013 to increase the β-oxidation rate. Results showed that l-carnitine shortened the biotransformation period by approximately 10 h and increased γ-decalactone production by 19.5%. γ-Caprolactone, γ-octalactone, and γ-dodecalactone were separately added to the medium to prevent γ-decalactone degradation by yeast cells at the end of biotransformation. γ-Octalactone competitively inhibited γ-decalactone from binding to lactonase, resulting in an 11% increase in γ-decalactone production. This research proposed an effective approach to improve the γ-decalactone production rate, shorten the biotransformation period, and suppress the γ-decalactone degradation in S. cerevisiae.
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