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Lu, Jike; Deng, Li; Zhao, Rui; Zhang, Ruisi; Wang, Fang; Tan, Tianwei
Journal of molecular catalysis. B, Enzymatic, 01/2010, Letnik: 62, Številka: 1Journal Article
Candida sp. 99-125 lipase immobilized on textile membrane was pretreated with several methods to improve its activity and methanol tolerance for biodiesel production. Lipase pretreatments with short chain alcohols from n-propyl alcohol to isobutyl alcohol did not have any positive effect on the lipase activity and methanol tolerance. While lipase treated with methanol solutions from 10 to 20% volume concentrations did enhance the enzyme activity and methanol tolerance, and this lipase activation effect did not exist when methanol volume concentration was 40%. 1 mM salt solutions of (NH 4) 2SO 4, CaCl 2, KCl, K 2SO 4 and MgCl 2 pretreatments were the useful tools to improve the lipase activity and methanol tolerance. The reason might be that salts could incorporate with the protein molecular to form a more stable molecular to resist conformation change induced by high methanol concentration. The operational stability of pretreated lipase was improved dramatically for biodiesel production during batch reactions.
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