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Production of biodiesel fuel from soybean oil catalyzed by fungus whole-cell biocatalysts in ionic liquids

Paper ID Volume ID Publish Year Pages File Format Full-Text
17800 42696 2010 5 PDF Available
Title
Production of biodiesel fuel from soybean oil catalyzed by fungus whole-cell biocatalysts in ionic liquids
Abstract

The methanolysis of soybean oil to produce a fatty acid methyl ester (ME, i.e., biodiesel fuel) was catalyzed by lipase-producing filamentous fungi immobilized on biomass support particles (BSPs) as a whole-cell biocatalyst in the presence of ionic liquids. We used four types of whole-cell biocatalysts: wild-type Rhizopus oryzae producing triacylglycerol lipase (w-ROL), recombinant Aspergillus oryzae expressing Fusarium heterosporum lipase (r-FHL), Candida antarctica lipase B (r-CALB), and mono- and diacylglycerol lipase from A. oryzae (r-mdlB). w-ROL gave the high yield of fatty acid methyl ester (ME) in ionic liquid [Emim][BF4] or [Bmim][BF4] biphasic systems following a 24 h reaction. While lipases are known to be severely deactivated by an excess amount of methanol (e.g. 1.5 Mequiv. of methanol against oil) in a conventional system, methanolysis successfully proceeded even with a methanol/oil ratio of 4 in the ionic liquid biphasic system, where the ionic liquids would work as a reservoir of methanol to suppress the enzyme deactivation. When only w-ROL was used as a biocatalyst for methanolysis, unreacted mono-glyceride remained due to the 1,3-positional specificity of R. oryzae lipase. High ME conversion was attained by the combined use of two types of whole-cell biocatalysts, w-ROL and r-mdlB. In a stability test, the activity of w-ROL was reduced to one-third of its original value after incubation in [Bmim][BF4] for 72 h. The stability of w-ROL in [Bmim][BF4] was greatly enhanced by cross-linking the biocatalyst with glutaraldehyde. The present study demonstrated that ionic liquids are promising candidates for use as the second solvent in biodiesel fuel production by whole-cell biocatalysts.

Keywords
Ionic liquid; Whole-cell biocatalyst; Biodiesel fuel; Transesterification; Immobilization; Stabilization; Non-aqueous media
First Page Preview
Production of biodiesel fuel from soybean oil catalyzed by fungus whole-cell biocatalysts in ionic liquids
Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 46, Issue 1, 7 January 2010, Pages 51–55
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering