The solid phase microextraction gas chromatography-mass spectrometry (SPME/GC/MS) analytical technique has been used to study quantitatively the outgases from materials aging. The detective method and its conditions h...The solid phase microextraction gas chromatography-mass spectrometry (SPME/GC/MS) analytical technique has been used to study quantitatively the outgases from materials aging. The detective method and its conditions have been discussed. The effect of extracting time on analysis results and the linear correlations between the concentration and its peak areas and the repeatability of this method have been researched.. The correlative factors of quantitatively extracting some organic components have been received.展开更多
为筛选风味优良的发酵剂菌株。该实验在前期研究的基础上,以具有良好风味的德氏乳杆菌保加利亚亚种和嗜热链球菌为实验菌株,进行复配发酵,采用固相微萃取-气相色谱-质谱(solid phase microextraction and gas chromatography-mass spect...为筛选风味优良的发酵剂菌株。该实验在前期研究的基础上,以具有良好风味的德氏乳杆菌保加利亚亚种和嗜热链球菌为实验菌株,进行复配发酵,采用固相微萃取-气相色谱-质谱(solid phase microextraction and gas chromatography-mass spectrometry,SPME-GC-MS)等方法对复配发酵乳香气成分进行检测分析。SPME-GC-MS分析结果表明,对照菌株JD和6组复配发酵乳中共检测出116种挥发性风味物质,其中有酸类化合物(17种)、醛类化合物(11种)、酮类化合物(17种)、醇类化合物(15种)、酯类化合物(11种)、烷烃类(30种)、含氮化合物(15种)。气味活度值(odor activity values,OAV)结果表明发酵乳中关键性风味物质(OAV≥1)有6种,包括3-甲基丁醛、苯甲醛、正壬醛、双乙酰、乙偶姻和2-壬酮。而其他化合物,如辛酸、乙醛、3-羟基丁醛、庚醛、癸醛和2-庚酮等对发酵乳的整体风味起修饰作用(0. 1≤OAV <1)。其中,这些关键性风味物质在样品中浓度较高,赋予发酵乳优良风味。主成分分析及线性判别分析结果表明,A6复配组有良好产香特性,在发酵过程中产生的风味和酸类化合物、酮类化合物、醇类化合物、含氮类化合物、烷烃类化合物等呈正相关。展开更多
文摘The solid phase microextraction gas chromatography-mass spectrometry (SPME/GC/MS) analytical technique has been used to study quantitatively the outgases from materials aging. The detective method and its conditions have been discussed. The effect of extracting time on analysis results and the linear correlations between the concentration and its peak areas and the repeatability of this method have been researched.. The correlative factors of quantitatively extracting some organic components have been received.
