食品科学 ›› 2010, Vol. 31 ›› Issue (20): 325-328.doi: 10.7506/spkx1002-6630-201020068

• 分析检测 • 上一篇    下一篇

甲基戊酸中甲基位置对其香气强度的影响

刘玉平1,尹德才1,李 宁1 ,2,孙宝国1,陈海涛1 ,*   

  1. 1.北京工商大学化学与环境工程学院
    2.陕西科技大学化学与化工学院
  • 收稿日期:2010-07-07 出版日期:2010-10-25 发布日期:2010-12-29
  • 通讯作者: 陈海涛 E-mail:chenht@th.btbu.edu.cn
  • 基金资助:

    北京市优秀人才培养资助项目(20081D0500300127)

Effect of Methyl Position on Aroma Intensity of Methylvaleric Acids

LIU Yu-ping1,YIN De-cai1,LI Ning1,2,SUN Bao-guo1,CHEN Hai-tao1,*   

  1. 1. School of Chemical and Environmental Engineering, Beijing Technology and Business University, Beijing 100048, China;
    2. College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China
  • Received:2010-07-07 Online:2010-10-25 Published:2010-12-29
  • Contact: CHEN Hai-tao1 E-mail:chenht@th.btbu.edu.cn

摘要:

采用3 点选配法(3-AFC)并结合最优估计阈值(BET)法对这甲基戊酸的3 种同分异构体—— 2- 甲基戊酸、3- 甲基戊酸和4- 甲基戊酸阈值进行计算,得到3 种香料的阈值分别为63.49、0.886、0.713mg/kg。同时,使用电子鼻对3 种化合物的香气强度进行比较,在10、100、1000mg/kg 的溶液,3 种化合物的香气强度由强到弱的顺序为4- 甲基戊酸> 3- 甲基戊酸> 2- 甲基戊酸,这与3 种化合物的阈值测试情况吻合。结论:甲基位置对甲基戊酸的香气强度有影响,随着甲基与羧基距离的增加,甲基戊酸的香气强度逐渐增强。

关键词: 甲基戊酸, 香气强度, 阈值, 3 点选配法检验(3-AFC), 最优估计阈值(BET)

Abstract:

2-Methylvaleric acid, 3-methylvaleric acid and 4-methylvaleric acid are three isomers of methylvaleric acids and all of them can be used in food. Their aroma intensities are different. In this work, the aroma thresholds of the three methylvaleric acids were evaluated by 3-AFC test to be 63.49, 0.886 mg/kg and 0.713 mg/kg, respectively. Meanwhile, their aroma intensities were also compared with the determined values by electronic nose. Results showed that the aroma intensities of the three flavor compounds from strong to weak were 4-methylvaleric acid, 3-methylvaleric acid and 2-methylvaleric acid at identical concentrations of 10, 100 mg/kg and 1000 mg/kg. The determined results by both methods were consistent. Therefore, the position of the methyl group exhibited an obvious effect on aroma intensity of methylvaleric acids and the aroma intensity was increased with the increase of distance between the methyl group and the carboxyl group.

Key words: methylvaleric acid, aroma intensity, threshold, three alternative forced-choice test (3-AFC test), best estimated threshold

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