Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4363896 | Food Microbiology | 2006 | 8 Pages |
Abstract
The isolated yeasts from strawberries could grow on the strawberry-agar, both under air conditions and modified atmosphere (MA) conditions. The maximum count for the yeasts reached 7.5-8.5 log cfu cmâ2 (air conditions) and 5.6-6.4 log cfu cmâ2 (MA conditions). Production or consumption of a number of compounds could be detected when microbial counts reached levels between 4.7 log cfu cmâ2 and 8.5 log cfu cmâ2 depending on species and atmospheric conditions. A range of volatile organic compounds, produced by the yeasts, was detected: acetone, ethyl acetate, ethanol, isopropyl acetate, ethyl butyrate, 1-propanol, 2-methyl-1-propanol, 1-butanol, 2-methyl-1-butanol, 3-methyl-1-butanol, 1-hexanol and hexyl acetate. These compounds are able to influence the sensory properties of strawberries. A simultaneous decrease in sugar concentrations (sucrose, glucose, fructose) was observed. When ethanol reached high concentrations, ethyl acetate and ethyl butyrate were produced. This production can be attributed to a detoxification of ethanol by yeasts. The fermentative metabolism of yeasts during aerobic conditions could be explained by the Crabtree effect. As the detected volatile organic compounds produced by yeasts are also found in fresh strawberries, it can be concluded that these compounds are produced both by microbiological and physiological processes.
Keywords
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Life Sciences
Agricultural and Biological Sciences
Food Science
Authors
P. Ragaert, F. Devlieghere, S. Loos, J. Dewulf, H. Van Langenhove, J. Debevere,