高压脉冲电场对酿酒酵母细胞膜流动性及脂肪酸组成的影响
首发时间:2012-12-20
摘要:本文主要从高压脉冲电场作用下酿酒酵母细胞膜流动性及脂质组成的变化探究高压脉冲电场作用对酿酒酵母细胞膜的损伤机制。通过荧光偏振法对酿酒酵母细胞膜流动性的检测发现,在30 kV/cm的电场强度下,随着PEF处理时间的延长,酿酒酵母细胞膜流动性逐渐降低,且二者呈线性关系。采用气相色谱-质谱联用(GC-MS)技术对30kV/cm、200μs PEF处理的酿酒酵母细胞脂肪酸成分分析结果表明:经PEF处理过的酵母细胞膜总脂肪酸相对含量由94.74%减少到90.83%,其中不饱和脂肪酸相对含量由原来的71.14%减少为60.56%。PEF处理过程中氢自由基的产生可能是脂质过氧化以及细胞膜流动性降低的主要诱导因素。
关键词: 食品科学技术 高压脉冲电场(PEF) 细胞膜流动性 脂肪酸
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Effect of Pulsed Electric Fields on lipid composition and membrane fluidity of Saccharomyces cerevisiae
Abstract:The effect of PEF on lipid composition and membrane fluidity of Saccharomyces cerevisiae were examined in the present work in order to explore the membrane damage mechanism of the S.cerevisiae cells induced by pulse electric fields (PEF). Fluorescence polarization was used as the method of detection of membrane fluidity, which was found to be gradually reduced with the PEF processing time prolonged at the electric field of 30kV/cm. The fatty acid component of S. cerevisiae cells was obtained by Gas chromatography-mass spectrometry (GC-MS) analysis before and after PEF treatment (30kV/cm, 200μs). After PEF treatment, the relative content of the total fatty acids of the yeast cells decreased from 94.74% to 90.83%, wherein the relative content of unsaturated fatty acid reduced from 71.14% to 60.56%. The generation of hydrogen radicals in PEF process was the main factor of lipid peroxidation and reduced membrane fluidity.
Keywords: Food Science and Technology Pulsed Electric Field membrane fluidity fatty acid
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高压脉冲电场对酿酒酵母细胞膜流动性及脂肪酸组成的影响
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