Condition optimization and kinetic evaluation of Novozym 435-catalyzed synthesis of aroma pyridine esters
作者:Qianrui Zhao、Xi Zhang、Meng Zhou、Miao Lai、Dingxia Zhou、Yake Wang、Fang Liu、Mingqin Zhao
DOI:10.1016/j.mcat.2023.113532
日期:2023.11
A new method for rapid synthesis of pyridine esters without stirring based on Novozym 435 catalysis had been reported, which was from pyridine methanols and vinyl esters. Based on single factor experiment, the optimization of the enzymatic transesterification was received by response surface methodology (RSM). The high yield of 82% was still reached when Novozym 435 had been recycled 12 times. Under
报道了一种基于Novozym 435催化、无需搅拌、以吡啶甲醇和乙烯基酯为原料快速合成吡啶酯的新方法。在单因素实验的基础上,采用响应面法(RSM)对酶促酯交换反应进行优化。Novozym 435 循环使用 12 次后,仍能达到 82% 的高产率。在最佳条件下,共合成了22种吡啶酯。通过酶法建立了Novozym 435催化乙酸乙烯酯与3-吡啶甲醇酯交换反应的动力学模型。发现该反应遵循Ping-Pong Bi-Bi机理,并且3-吡啶甲醇抑制该反应。采用气相色谱-质谱-嗅觉测定法(GC-MS-O)分析合成的吡啶酯,3e )、吡啶-3-基甲基肉桂酸酯( 3i )和2-(吡啶-2-基)乙基乙酸酯(3s)具有强烈且优异的香气。通过热重 (TG) 分析发现这三种风味化合物(3e、3i和 3s)在指定温度下具有良好的稳定性。