biological activities. However, the low hydrophilicity and lipophilicity of CA limited its application. Dodecyl caffeate (DC) is the lipophilic ester of caffeic acid (CA), and also has high antioxidant activity. In this work, CA, used as a substrate, and three ionic liquids with different acidities and H2SO4 were used as economic catalysts for DC preparation. The effects of variables on DC yield were
咖啡酸(CA)广泛存在于自然界中,具有广泛的
生物活性。然而,CA的低亲
水性和亲油性限制了其应用。
咖啡酸十二烷基酯(DC)是
咖啡酸(CA)的亲脂性酯,也具有高抗氧化活性。本工作以CA为底物,采用三种不同酸度的
离子液体和H 2 SO 4作为经济的催化剂来制备DC。通过响应面法 (RSM) 研究并优化了变量对 DC 产量的影响。并对CA与
十二醇酯化反应的动力学和热力学参数进行了评价。结果表明,以
离子液体([Hnmp]HSO 4 )为催化剂,成功合成了亲脂性DC。 RSM的最佳条件为底物比10.2:1、IL用量9.8%、87℃、118min。在可选条件下,最大直流产率为94.67±1.32%。 k 0 、 E a 、Δ H 、Δ S和Δ G分别为 7.18 × 10 7 mol (L min) -1 、 65.77 kJ mol -1 、 63.10 kJ (mol K) -1 、 -103.80