Studies on the Immobilized-Lipase-Catalyzed Esterification of Alkyl Oleates in Solvent-Free Systems

Hui Zhong; Zheng Fang; Bao Hua Zou; Xin Li; Kai Guo

doi:10.4028/www.scientific.net/AMR.645.19

Paper Titles

Preface

Synthesis and Characterization of Exotic Carbon Fibers with Branched Spurs Using Nickel Catalyst Precursor
p.3

Synthesis and Self-Assemble Behavior of Block Copolymerization of Vinyl Acetate and N-Vinylacetamide
p.10

Study on Engineering Property of Water-Based Epoxy Resin Mortar
p.15

Studies on the Immobilized-Lipase-Catalyzed Esterification of Alkyl Oleates in Solvent-Free Systems
p.19

Catalytic Synthesis and Growth Mechanism of Multi-Branched Carbon Fibers by Cupric Solution Precursors
p.24

Decay Characteristic of Fiber Bragg Grating and Fabrication of High Temperature Resistance Grating Temperature Sensor
p.30

The Impacts of Different Charge Compensators on the Luminescence Properties of BaMg₂ (PO₄)₂: Eu ³⁺
p.34

Manufacturing Composite from Regenerated Wood Fiber and Polyethylene via Platen-Pressing Process
p.39

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Studies on the Immobilized-Lipase-Catalyzed Esterification of Alkyl Oleates in Solvent-Free Systems

Abstract:

The esterification of oleic acid with alkyl alcohols in solv ent-free systems was catalyzed by an immobilized lipase from Candida sp . 99-125. The influence of several factors, including enzyme concentration, temperature, molar ratio between oleic acid and alkyl alcohols, and structure of alcohol was also investigated. The results indicated that the reactions catalyzed by lipase at 20 o C, in the presence of 3% (w/w) lipase, on the molar ratio of 1:1 between oleic acid and alcohols, afforded products in high yield. It showed high selectivity to primary and low selectivity to secondary alcohols and tertiary alcohols because of the sterically hindered effect. Methanol has certain toxicity on the activity of the lipase. The lipase from Candida sp. 99-125 was identified to be an effective catalyst in the esterification of alcohol and oleic acid at low temperature.