食品科学

• 基础研究 • 上一篇    下一篇

抗坏血酸/半胱氨酸体系美拉德反应形成风味物质动力学

唐乐攀1,2,杨小洪2,余爱农1,2,*   

  1. 1.生物资源保护与利用湖北省重点实验室,湖北 恩施 445000;
    2.湖北民族学院化学与环境工程学院,湖北 恩施 445000
  • 出版日期:2015-06-15 发布日期:2015-06-07

Kinetic Study of Volatile Favor Compound Formation in Ascorbic Acid-Cysteine Maillard Reaction System

TANG Lepan1,2, YANG Xiaohong2, YU Ainong1,2,*   

  1. 1. Key Laboratory of Biological Resources Protection and Utilization of Hubei Province, Enshi 445000, China;
    2. School of Chemistry and Environmental Engineering, Hubei University for Nationalities, Enshi 445000, China
  • Online:2015-06-15 Published:2015-06-07

摘要:

在抗坏血酸/半胱氨酸体系中,应用溶剂萃取法对美拉德反应形成的特征风味物质进行富集,通过气相色谱-质谱联用仪(gas chromatography-mass spectrometry,GC-MS)和气相色谱-氢火焰离子化检测器(gaschromatography-flame ionization detector,GC-FID)进行定性研究和准确的定量分析,研究其反应动力学。结果表明:基于抗坏血酸的美拉德反应与传统的美拉德反应存在明显差异,主要表现在起始反应温度和风味物质的种类及动力学上。对特征风味物质进行动力学分析发现,2-乙酰基噻吩和3-乙酰基噻吩由于结构相似,含量及动力学表现也极为相似;2-丙基四氢噻吩在高温下浓度会先升高后降低,最终均稳定在0.035 mmol/L左右;2-甲基-4-丙基噻唑和2-乙酰基噻唑含量差别很大,表明两者生成机理完全不同;2-甲基四氢噻吩-3-酮和四氢噻吩-3-酮结构相似,但后者会进一步反应使得两者含量差别较大;甲基吡嗪的生成满足零级动力学,且反应温度高于125 ℃时其生成速率基本保持不变。

关键词: 美拉德反应, 风味物质, 动力学

Abstract:

This study is based on the ascorbic acid-cysteine Maillard reaction system. The volatile favor compounds were
enriched by solvent extraction and analyzed qualitatively and quantitatively by GC-MS and GC-FID. The kinetics of their
formation was studied. The results indicated that Maillard reaction based on ascorbic acid was quite different from the
conventional one. The kinetic changes of 2-acetylthiophene and 3-acetylthiophene were resembled because of their similar
structures. At higher temperature, the concentration of 2-propyltetrahydrothiophene increased at first and then decreased to
0.035 mmol/L. The widely varying concentrations of 2-methyl-4-propylthiazole and 2-acetylthiazole were due to different
generation mechanisms. Although the molecular structures of 2-methyltetrahydrothiophen-3-one and tetrahydrothiophen-
3-one were similar, the latter one could conduct further reaction, thereby leading to a decrease in its concentration. The
generation of methylpyrazine was a zero-order reaction and the rate remained the same at a temperature above 125 ℃.

Key words: Maillard reaction, volatiles, kinetics

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