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Improvement in lipase-catalyzed synthesis of fatty acid methyl esters from sunflower oil



Improvement in lipase-catalyzed synthesis of fatty acid methyl esters from sunflower oil



Enzyme & Microbial Technology 33(1): 97-103, 16 July



Biodiesel as alkyl esters derived from vegetable oils has considerable advantages in terms of environmental protection. In the present work, methyl esters were produced from sunflower oil by lipase-catalyzed reactions. The effect of organic solvent on alcoholysis rate was investigated and highest conversion (80%) was found in n-hexane and petroleum ether. Among several microbial lipases tested for alcoholysis activity in a solvent-free system, the best conversion (>90%) was found with lipase from Pseudomonas fluorescens (Amano AK) at the highest molar equivalent of oil:methanol (1:4.5). To reduce inactivation of commercial immobilized lipases by methanol, a three-step protocol consisting of the stepwise addition of 1 M equivalent of methanol at 5 h intervals, was developed. Also with immobilized lipase from Rhizomucor miehei (Lipozyme RM IM) high conversion (>80%) was possible. Moreover, the transesterification could be conducted for at least 120 h during five batch runs without significant loss of activity.

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Accession: 010808476

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DOI: 10.1016/s0141-0229(03)00090-5


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