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Synthesis of fatty esters by polyethylene glycol-modified lipase


Basri, Mahiran and Ampon, Kamaruzaman and Wan Yunus, Wan Md. Zin and Abdul Razak, Che Nyonya and Salleh, Abu Bakar (1995) Synthesis of fatty esters by polyethylene glycol-modified lipase. Journal of Chemical Technology and Biotechnology, 64 (1). pp. 10-16. ISSN 0268-2575; ESSN: 1097-4660


Monomethoxypolyethylene glycols (PEG) of molecular masses 1900 and 5000 were activated using p-nitrophenyl chloroformate to form PEG–nitrophenyl carbonates (activated PEG) with high yield (96–98%). The activated PEG was covalently attached to Candida rugosa lipase. Increasing the molar ratio of activated PEG to the enzyme increased the degree of lipase modification. These modified lipases exhibited specific ester synthesis activities on organic solvents compared with native lipase. The degree of activity enhancement depended on the size of activated PEG used and the degree of modification of the enzyme. Maximal activity was attained after exhaustive of modification. The effects of different solvents, reaction temperature, and fatty acids on the esterification activity and the stability of the modified enzyme were investigated. The optimum esterification temperature (40°C) and preference of fatty acids as acyl donors of the modified lipase were very similar to those of the native enzyme. The modified lipase exhibited higher activity non-polar solvents than in polar solvents, and showed higher temperature, solvent and storage stability then the native lipase.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science and Environmental Studies
DOI Number: https://doi.org/10.1002/jctb.280640103
Publisher: Society of Chemical Industry
Keywords: PEG activation; Lipase modification; Esterification; Selectivity; Stability
Depositing User: Nabilah Mustapa
Date Deposited: 02 Feb 2016 04:04
Last Modified: 02 Feb 2016 04:04
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1002/jctb.280640103
URI: http://psasir.upm.edu.my/id/eprint/22572
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