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자료유형
학술저널
저자정보
저널정보
한국미생물생명공학회 Journal of Microbiology and Biotechnology Journal of Microbiology and Biotechnology 제15권 제6호
발행연도
2005.1
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1,183 - 1,184 (2page)

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Several lipases of commercial grade were screenedto catalyze the methanolysis of castor oil, and an immobilizedCandida antarctica (Novozym 435) had the highest activityamong the lipases tested. To enhance the yield of methylricinoleate, several reaction parameters were optimized. Theoptimum temperature was 50oC, and the original watercontent of lipase was sufficient to maintain the activity oflipase, and additional water supplied inhibited the methanolysisof castor oil. Because the lipase was deactivated by methanol,the reaction was tested by three-step addition of 1 molarequivalent of methanol to the oil. However, the oil was notcompletely converted to its methyl esters. The final reactionmixture using 3 molar equivalents of methanol to the oilconsisted of 70% methyl ricinoleate, 18% monoricinoleate,11% diricinoleate, and trace triricinoleate at the equilibriumstate. The yield of methyl ricinoleate was 97% at 6 molar ratioof methanol to the oil with 300 g of castor oil and 6 g ofimmobilized Candida antarctica at 50oC within 24 h.

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