A Process for Synthesizing High Purity Monoglyceride

高純度單酸甘油酯之製程

楊永慶(Yong-Ching Yang) ； 范力(Shaik Ramjan Vali) ； 朱義旭(Yi-Hsu Ju)

《Journal of the Chinese Institute of Chemical Engineers》 34卷6期 (2003/11) Pp. 617-623

https://doi.org/10.6967/JCICE.200311.0617

摘要

Synthesis of high-purity (＞99%) monostearin was carried out using a two-step process. The first step involved lipase-assisted enzymatic esterification of fatty acid with glycerol catalyzed by immobilized lipase Candida antarctica (Novozym 435) in acetone.The reaction was carried out at a fatty acid (FA) to glycerol molar ratio of 1:4 with 5% lipase based on the fatty acid (FA) weight. Equilibrium was attained within 8 h with a monoglyceride (MG) content and a degree of esterifcation of 82.4WT% and 85.5%, respectively. The addition of solvent shifted the equilibrium toward product formation and resulted in further increases of the MG content and the degree of esterification to 89.7 wt% and 92.7%,respectively,after 16 h (total: 24 h). The major impurities in the reaction product were free fatty acids (up to 7 wt%) and di- and triglycerides(＜3.5%). The second step involved the removal of fatty acids vy a mild alkali treatment, and it produced MG with purity greater than 99 wt% and an overall of 66.8%. Comparison of various solvents shows that the extent of esterification and product selectivity are strongly dependent on the solubility-solvation of the substrate and product in the reaction medium. Thus, monoglycerides was carried out using monostearin synthesis as model system in this investigation.

並列摘要

Synthesis of high-purity (＞99%) monostearin was carried out using a two-step process. The first step involved lipase-assisted enzymatic esterification of fatty acid with glycerol catalyzed by immobilized lipase Candida antarctica (Novozym 435) in acetone.The reaction was carried out at a fatty acid (FA) to glycerol molar ratio of 1:4 with 5% lipase based on the fatty acid (FA) weight. Equilibrium was attained within 8 h with a monoglyceride (MG) content and a degree of esterifcation of 82.4WT% and 85.5%, respectively. The addition of solvent shifted the equilibrium toward product formation and resulted in further increases of the MG content and the degree of esterification to 89.7 wt% and 92.7%,respectively,after 16 h (total: 24 h). The major impurities in the reaction product were free fatty acids (up to 7 wt%) and di- and triglycerides(＜3.5%). The second step involved the removal of fatty acids vy a mild alkali treatment, and it produced MG with purity greater than 99 wt% and an overall of 66.8%. Comparison of various solvents shows that the extent of esterification and product selectivity are strongly dependent on the solubility-solvation of the substrate and product in the reaction medium. Thus, monoglycerides was carried out using monostearin synthesis as model system in this investigation.

並列關鍵字

acylglycerols ； esterification ； lipase ； monoglycerides ； reaction equilibrium ； solvent polarity