为了初步研究食品添加剂L-苯丙氨酸对苹果醋发酵过程中的特征性香气成分乙酸-2-苯乙酯的合成途径及关键酶活的影响，采用HS-SPME-GC-MS和ELISA，检测各合成相关基质生成量和关键酶活性的变化。结果表明，不同添加量的L-苯丙氨酸有明显促进乙酸-2-苯乙酯及其相关合成基质生成量积累的作用，并且对ADH、AAT的酶活性也有一定的促进作用，而对Esterase酶活性有抑制作用。其中当L-苯丙氨酸添加量为8 g/L时，乙酸-2-苯乙酯生成量显著提高了43.76%~86.59%。因此，本试验初步将8 g/L作为L-苯丙氨酸的最佳添加量，初步推测L-苯丙氨酸通过醇酰基转移酶途径促进乙酸-2-苯乙酯的合成及其相关基质和关键酶活的生成量，赋予苹果醋产品更多独特的香气和风味，为生产工艺提供一定的参考依据。

In order to study the effects of L-phenylalanine (a food additive) on the synthetic pathway and key enzyme activity related to acetic acid-2-phenyl ethyl ester in apple vinegar fermentation, HS-SPME-GC-MS and ELISA were employed to detect the changes of the matrix concentration and key enzyme activities in the synthesis of acetic acid-2-phenyl ethyl ester. It was shown that different amounts of L-phenylalanine can significantly promote the production of acetic acid-2-phenyl ethyl ester and the synthesis of the related matrix, and L-phenylalanine can increase the enzymatic activities of ADH and AAT, however, it suppressed the activity of Esterase enzyme. When 8 g/L of L-phenylalanine was added, the concentration of acetic acid-2-phenyl ethyl ester significantly increased from 43.76% to 86.59%;Therefore, the optimum additive amount of L-phenylalanine was 8 g/L, speculating that L-phenylalanine induced the synthesis of acetic acid-2-phenyl ethyl ester and its related matrix, and increased key enzyme activities through alcohol acyltransferase pathway, which increased the unique aroma and flavor of apple vinegar products and provided a reference for the production process.

国家现代农业产业技术体系建设专项（CARS-27）；国家自然科学基金地区基金项目（31460449）；甘肃省农牧厅科技项目(GNKJ-2018-10)；甘肃省农业科学院农业科技创新专项中青年创新基金项目（2016GAAS49）