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毕赤酵母展示稻米脂肪酶催化乙酸乙酯研究
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Rice Lipase Displayed on Pichia pastoris Surface Catalyzed Synthesis of Ethyl Acetate
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DOI:10.3969/j.issn.1673-1689.2018.05.013
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中文关键词: 稻米脂肪酶 合成乙酸乙酯 毕赤酵母
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英文关键词: rice lipase,synthesis of ethyl acetate,Pichia pastoris
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中文摘要:
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论文利用展示在毕赤酵母表面的稻米脂肪酶作为催化剂在正己烷中催化合成乙酸乙酯,考察了稻米脂肪酶的酶活、底物摩尔比、反应温度、反应时间和3A分子筛添加量对合成乙酸乙酯反应的影响.结果表明,在15 mL正己烷体系中,n(乙酸/乙醇,摩尔比)为1.2∶1,稻米脂肪酶的酶活为15 750 U/g,发酵时间为4 h,反应温度为40 ℃,3A分子筛添加质量为8%是合成乙酸乙酯的最佳条件。在此条件下,稻米脂肪酶催化合成乙酸乙酯的转化率达到90.92%。
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英文摘要:
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In this study,the rice lipase(RL) was displayed on the surfaceof Pichia pastoris to catalyze synthesis of ethyl acetate in n-hexane,the influence of some factors such as the enzyme activity of rice lipase,substrate concentration,reaction temperature,reaction time,the amount of 3A molecular sieve on the synthesis of ethyl acetate was investigated. The study showed that,acetic acid / ethanol(mol/mol) ratio1.2∶1,reaction time of 4 h,reaction temperature of 40 ℃,the enzyme activityof rice lipase 15 750 U/g,the adding amount of 3A molecular sieve8 % in 15 mL n-hexane was the optimum condition . Under the condition,the reaction conversion of rice lipase catalyzed synthesis of ethyl acetate reached 90.92%.
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