广西发酵酸笋气味物质提取方法优化及比较分析
Optimization and Comparison Analysis of Extraction Methods of Odorant from Guangxi Fermentated Bamboo Shoots
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摘要: 为探索广西发酵酸笋的最佳气味物质提取方法,为进一步进行气味分析提供方法支持,本实验以广西发酵酸笋作为材料,使用气相色谱-质谱联用仪(GC-MS)分别对液液萃取(LLE)、同时蒸馏萃取(SDE)与顶空固相微萃取(HS-SPME)3种提取方法的提取条件进行了优化和比较。结果表明三种提取方法的最佳提取条件和提取效果为:LLE法以乙醚作为提取溶剂,饱和氯化钠溶液为稀释液,萃取物峰面积最大,萃取物质种类为34种,气味贡献物相对含量低;SDE法以二氯甲烷为提取溶剂,稀释液采用100 mL饱和氯化钠溶液,提取时间为2 h,气味贡献物相对含量高,但萃取物质峰面积最小,萃取物质种类最少,为24种;HS-SPME法采用65 μm PDMS/DVB萃取头,添加1.2 g氯化钠,萃取温度和时间分别为50 ℃和30 min,萃取峰面积较大,萃取物质种类最多,为41种,气味贡献物相对含量高。故HS-SPME法为最佳萃取发酵酸笋气味物质的方法。Abstract: To discover the best odorant extraction methods of Guangxi fermentated bamboo shoots for further flavor study, Guangxi fermented bamboo shoots were used as material in this research to optimize extraction conditions and compare extraction effects of liquid-liquid extraction method (LLE), simultaneous distillation extraction method (SDE) and headspace solid-phase microextraction method (HS-SPME) by gas chromatography-mass spectrometry (GC-MS). The results showed that the optimum extraction conditions and extraction effects of three methods were as follows:LLE, using ethyl ether as extraction solution and saturated salt solution as dilute solution, peak area was the largest and 34 kinds of extracted substances were detected, the relative content of odor contribution was low;SDE, using dichloromethane as extraction solution and 100 mL saturated salt solution as dilute solution, extraction time was 2 h, peak area was the smallest and 24 kinds of extracted substances were detected, the relative content of odor contribution was high;HS-SPME, using 65 μm PDMS/DVB extraction needle, adding 1.2 g sodium chloride to the sample, the extraction temperature was 50℃, and the extraction time was 30 min, peak area was large and 41 kinds of extracted substances were detected, and the relative content of odor contribution was the highest.The results showed that HS-SPME was more suitable for extracting odorants from fermented bamboo shoots.