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Production of γ-Decalactone by Yeast Strains under Different Conditions


Dayana Pereira de Andrade1small orcid_display_4pp, Beatriz Ferreira Carvalho2small orcid_display_4pp, Rosane Freitas Schwan1small orcid_display_4pp and Disney Ribeiro Dias3*small orcid_display_4pp


1Department of Biology, Federal University of Lavras, Campus Universitario, BR-37200-000, Lavras, MG, Brazil
2Department of Animal Science, Federal University of Lavras, Campus Universitario, BR-37200-000, Lavras, MG, Brazil
3Department of Food Science, Federal University of Lavras, Campus Universitario, BR-37200-000, Lavras, MG, Brazil




Article history:
Received October 2, 2016
Accepted April 19, 2017



Key words:
castor oil, crude glycerol, Lindnera saturnus, microbial γ-decalactone, Yarrowia lipolytica


Summary:
γ-Decalactone is a flavour compound that when obtained by biotechnological production using microorganisms is classified as natural. The aim of this study is to evaluate various conditions for γ-decalactone production by tropical yeast strains Yarrowia lipolytica CCMA 0242 and Lindnera saturnus CCMA 0243. The growth of and γ-decalactone production by Y. lipolytica CCMA 0242 were higher in castor oil than in glycerol. γ-Decalactone production in single batch or fed-batch fermentation did not differ significantly. The γ-decalactone production by L. saturnus CCMA 0243 was better at initial pH=5, while the production by Y. lipolytica CCMA 0242 was better at initial pH=6. The yeast L. saturnus CCMA 0243 produced more γ-decalactone than Y. lipolytica CCMA 0242 under the same fermentation conditions. The crude glycerol was not an alternative substrate for γ-decalactone production by Y. lipolytica CCMA 0242. Castor oil at volume fraction of 30 % showed better results as a substrate. The strain L. saturnus CCMA 0243 showed better results of γ-decalactone production. This yeast species can be considered an alternative producer of γ-decalactone in biotechnological processes.




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