title: Enzymatic synthesis of sialic acid derivative by immobilized lipase from Candida antarctica.
abstract: The effects of important reaction parameters on the enhancement of sialic acid derivative lipophilic properties through the lipase-catalyzed esterification of N-acetyl neuraminic acid methyl ester are investigated in this study. It is found that the lipase Novozym 435 from Candida antarctica is particularly useful in the preparation of sialic acid methyl ester monononanoate (SAMEMN). The optimum temperature for the SAMEMN synthesis reaction using Novozym 435 is 60°C, and nonanoic anhydride is found to be the best substrate among all acyl donors. The Novozym 435-catalyzed esterification of N-acetyl neuraminic acid methyl ester gave a maximum yield of 87.7% after 6h in acetonitrile at 60°C. Because the novel method developed is simple, yet effective, it could potentially be used industrially for the production of sialic acid derivatives.
authors: School of Applied Chemistry, Chung Shan Medical University, Taichung 40201, Taiwan, ROC.
authors: Chi-Min
authors: CM
authors: Chau
authors: Kuan-Ju
authors: KJ
authors: Liu
authors: Chun-Hung
authors: CH
authors: Lin
mesh_terms: D055162:Biocatalysis; D002175:Candida / Q000201:enzymology*; D004800:Enzymes, Immobilized / Q000378:metabolism*; D004952:Esters / Q000378:metabolism; D005656:Fungal Proteins; D008049:Lipase / Q000378:metabolism*; D019158:N-Acetylneuraminic Acid / Q000096:biosynthesis*; D012997:Solvents; D013696:Temperature; D013997:Time Factors
chemical_list: D004800:Enzymes, Immobilized; D004952:Esters; D005656:Fungal Proteins; D012997:Solvents; C093667:Novozyme 435; D008049:Lipase; D019158:N-Acetylneuraminic Acid