HS-SPME结合GC-O-MS技术分析不同大曲中的香气活性化合物
发布时间:2018-04-14 00:24
本文选题:大曲 + 顶空-固相微萃取 ; 参考:《食品工业科技》2017年06期
【摘要】:通过顶空-固相微萃取(HS-SPME)结合气相色谱-嗅闻-质谱(GC-O-MS)联用技术,研究了大曲的香气成分,同时考察了萃取头、萃取时间、萃取温度和样品量对大曲样品中挥发性成分分析的影响。结果表明:取1.5 g样品在50℃下平衡10 min后,用50/30μm DVB/CAR/PDMS纤维萃取头在50℃下萃取30 min,萃取效果较好;在此条件下分析大曲样品,7种大曲中共检出69种挥发性成分,包括醇类9种、酯类13种、醛类8种、酮类4种、酸类3种、吡嗪类9种、芳香族类8种、酚类5种、杂环类2种、烷烃类3种和其他类5种;采用GC-O-MS检出17种为香气活性化合物,定性出14种化合物,其中2-乙基-3,5-二甲基吡嗪、苯乙醛是OAV值较大且香气强度较大的香气活性化合物,贡献了烤土豆香、蜂蜜香、甜香,综合组成了大曲独特的风味。
[Abstract]:The aroma constituents of Daqu were studied by headspace-solid phase microextraction (HS-SPME-HS-SPME-GC-O-MS) combined with gas chromatography-sniffing mass spectrometry (GC-O-MS). The extraction head and extraction time were also investigated.The effects of extraction temperature and sample quantity on the analysis of volatile components in Daqu samples.The results showed that the extraction of 1.5 g sample at 50 鈩,
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