文献类型： 外文期刊
第一作者： Niu, Debao
作者： Niu, Debao;Wang, Lang-Hong;Zeng, Xin-An;Wen, Qing-Hui;Tang, Zhong-Sheng;Niu, Debao;Wang, Lang-Hong;Zeng, Xin-An;Wen, Qing-Hui;Brennan, Charles S.;Tang, Zhong-Sheng;Brennan, Charles S.;Wang, Man-Sheng
作者机构：
关键词： Ethanol; Acetobacter sp.; Fluidity; Membrane lipid conformation; Pulsed electric fields
期刊名称：INNOVATIVE FOOD SCIENCE & EMERGING TECHNOLOGIES （ 影响因子：5.916； 五年影响因子：6.159 ）
ISSN： 1466-8564
年卷期： 2019 年 52 卷
页码：
收录情况： SCI
摘要： The effects of low concentrations of ethanol (3% to 9%, v/v) on cell membrane fatty acid composition, membrane lipid conformation, membrane fluidity and pulsed electric fields (PEF) resistance of Acetobacter sp. in the stationary phase were investigated. Results showed that the growth of Acetobacter sp. was inhibited, and analysis of gas chromatography-mass spectrometry, Raman spectroscopy and fluorescence polarization indicated that membrane fluidity of Acetobacter sp. cells was significantly increased by modifying membrane fatty acid composition and membrane lipid conformation after exposure to ethanol. Moreover, results showed that cells cultivated in the medium with relatively high ethanol concentrations were more vulnerable to PEF. For example, the inactivation of Acetobacter sp. (10(9) CFU/mL) cultivated with 9% ethanol by PEF (20.0 kV/cm, 6.0 ms) could reach 5.17 log, significantly higher than those cultivated without ethanol (3.22 log). This was confirmed by morphological analysis, showing various changes on the cell surface after PEF treatment. Industrial relevance: Acetobacter sp. is one of spoilage microorganisms in winemaking, and it is able to convert the ethanol produced by yeasts into acetic acid and thereby increase volatile acidity in wine. In this study, the effect of ethanol as a growth substrate on PEF resistance in Acetobacter sp. cells was investigated. Results here reported will contribute to better understand the influencing mechanisms of ethanol on the inactivation of Acetobacter sp. cells by PEF treatment and further develop the application of PEF for inactivating acetic acid bacteria (AAB) in the wine industry.
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