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研究了脂类氧化产物庚醛、(E)-2-庚烯醛和(E,E)-2,4-癸二烯醛对L-半胱氨酸与D-木糖组成的模型体系热反应挥发性产物的影响。采用固相微萃取-气质联用法对不同模型体系热反应挥发性产物进行分析,检测到的挥发性成分主要包括含氮、含硫及杂环类化合物,烃类,醇类,酮类和酯类物质。当模型体系中加入脂肪醛时,热反应产物中大多数含氮、含硫类化合物的含量明显减少,尤其是一些硫醇类,如2-甲基-3-呋喃硫醇和2-糠硫醇,并且随着反应体系中脂肪醛不饱和度的增加,其含量逐渐降低;一些噻吩类化合物含量也显著减少,如3-甲基噻吩和2,5-噻吩二甲醛等。然而,当体系中加入不饱和脂肪醛时,形成了一些新的噻吩类物质,如2-戊基噻吩和2-己基噻吩。此外,与对照相比,加入脂肪醛的热反应体系中新增了一些醇类、酮类和酯类物质。
The effects of the lipid oxidation products heptanal, (E) -2-heptenal and (E, E) -2,4-decadienal on the model system consisting of L-cysteine and D-xylose The reaction of volatile products. The volatile compounds in the reaction of different model systems were analyzed by solid-phase microextraction-gas chromatography-mass spectrometry (GC-MS / MS). The volatile components mainly included nitrogen, sulfur and heterocyclic compounds, hydrocarbons, alcohols, ketones and esters Substances. When the aliphatic aldehydes were added into the model system, the content of most nitrogenous and sulfur compounds in the thermal reaction products was obviously reduced, especially some thiols such as 2-methyl-3-furanyl mercaptan and 2-furfuryl mercaptan , And with the increase of unsaturation of aliphatic aldehydes in the reaction system, the content decreased; some thiophene compounds also decreased significantly, such as 3-methylthiophene and 2,5-thiophene dicarboxaldehyde. However, when unsaturated fatty aldehydes were added to the system, some new thiophene species were formed, such as 2-pentylthiophene and 2-hexylthiophene. In addition, alcohols, ketones and esters were added to the thermal reaction system with fatty aldehydes compared to the control.