Comprehensive Foodomics Platform, Analytical Food Chemistry, Technical University Munich, Alte Akademie 10, 85354, Freising, Germany.
Research Unit Analytical BioGeoChemistry (BGC), Helmholtz Zentrum München, Ingolstädter Landstrasse 1, 85764, Neuherberg, Germany.
Sci Rep. 2018 Nov 15;8(1):16879. doi: 10.1038/s41598-018-34335-5.
Reactions between sugars and amino acids in the Maillard reaction produce a multitude of compounds through interconnected chemical pathways. The course of the pathways changes depending on the nature of the amino acids and sugars as well as the processing conditions (e.g. temperature, water activity). Some partial pathways have been elucidated using labelled precursors but the process is very time intensive. Here, we use rapid, non-targeted analysis with Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) to deliver the molecular formulae and ion intensities of the compounds generated from reaction of four amino acids with ribose (10 h at 100 °C) to study the effect of amino acid side chains on the reaction pathways. Using van Krevelen diagrams, known chemical changes during the reaction (e.g. dehydration or decarboxylation) can be studied. Comparison of the data from the four amino acids studied, showed a common pathway, which involved 73 Maillard reaction products (MRPs) where the differences were due only to the nature of the amino acid side chain. From the more than 1400 different molecular formulae found, pathways unique to the amino acids were also identified and the order of reactivity was lysine >cysteine >isoleucine ≈ glycine. While unequivocal identification of the compounds cannot be achieved with FT-ICR-MS, applying known chemical transformations found in the Maillard reaction, not only identifies new and known pathways, but also integrates the MRPs into a general Maillard reaction scheme that better represents the totality of the Maillard reaction.
在美拉德反应中,糖和氨基酸之间的反应通过相互关联的化学途径产生多种化合物。途径的进程取决于氨基酸和糖的性质以及加工条件(例如温度、水活度)。使用标记前体已经阐明了一些部分途径,但该过程非常耗时。在这里,我们使用快速、非靶向的傅里叶变换离子回旋共振质谱 (FT-ICR-MS) 分析,提供了四种氨基酸与核糖(100°C 下 10 小时)反应生成的化合物的分子公式和离子强度,以研究氨基酸侧链对反应途径的影响。使用范克里夫图,可以研究反应过程中的已知化学变化(例如脱水或脱羧)。比较研究的四种氨基酸的数据表明,存在一条共同途径,其中涉及 73 种美拉德反应产物 (MRP),差异仅归因于氨基酸侧链的性质。从发现的 1400 多个不同的分子式中,还确定了仅特定于氨基酸的途径,并且反应活性顺序为赖氨酸>半胱氨酸>异亮氨酸≈甘氨酸。虽然 FT-ICR-MS 无法对化合物进行明确识别,但应用美拉德反应中发现的已知化学转化,不仅可以识别新的和已知的途径,还可以将 MRP 整合到更全面的美拉德反应方案中,更好地代表美拉德反应的整体。
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