离子液体中酶促转酯化合成咖啡酸苯乙酯的新工艺

New process for enzymatic synthesis of caffeic acid phenethyl ester via transesterification in ionic liquid

为提高抗肿瘤活性化合物咖啡酸苯乙酯的生物合成效率,建立离子液体中酶促转酯化合成新工艺.文中以咖啡酸甲酯和苯乙醇为原料,以脂肪酶和离子液体分别作为催化剂和反应介质,以咖啡酸苯乙酯得率为指标,考察了离子液体、脂肪酶、反应温度、底物摩尔比和酶用量等对咖啡酸苯乙酯得率的影响.结果表明:Novozym 435和[Bmim][Tf2N]分别为最佳的催化剂和反应介质;当反应温度90℃、醇酯摩尔比20∶1、酶酯质量比10∶1时,转酯化反应24 h,咖啡酸苯乙酯得率达66.40%.因此,离子液体中酶促转酯化合成咖啡酸苯乙酯相比直接酯化合成法得率高,耗时短.

To improve the biosynthesis efficiency of caffeic acid phenethyl ester （CAPE） with the antitumor ac- tivity, a new process for lipase-catalyzed transesterification in ionic liquid was established. In the present study, methyl caffeate （MC） and phenylethanol （PE） were used as substrates, lipase and ionic liquid were used as cat- alyst and reaction media, the CAPE yield was used as an evaluation index, the effects of several factors including ionic liquid, lipase, reaction temperature, substrate molar ratio and enzyme dosage on CAPE yield were as- sessed, respectively. The results indicated that Novozym 435 and [ Bmim] [ Tf2N] were selected as the optimal catalyst and reaction media, respectively. The highest CAPE yield achieved 66.40 % when the reaction after 24 h under the optimal condition as follows ： temperature 90 ℃, molar ratio of PE to MC 20： 1, mass ratio of No- vozym 435 to MC 10： 1. Therefore, the lipase-catalyzed synthesis of CAPE via transesterification in ionic liquid has higher yield and shorter time than direct esterification.