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正交试验法优选洋葱中S-甲基半胱氨酸亚砜的提取工艺研究 被引量:1
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作者 吴悟贤 李生才 《上海中医药杂志》 北大核心 2003年第12期47-48,共2页
以洋葱中降血糖主要成分S -甲基半胱氨酸亚砜 (SMCS)的含量为指标 ,采用正交试验法优选最佳的提取工艺参数。结果显示 ,上柱前对洋葱煮沸灭活 6 0min ,用 80 %的乙醇萃提 ,调节 pH至 6 5 ,过柱层析分离后得到的SMCS含量能达到 4 0 %以... 以洋葱中降血糖主要成分S -甲基半胱氨酸亚砜 (SMCS)的含量为指标 ,采用正交试验法优选最佳的提取工艺参数。结果显示 ,上柱前对洋葱煮沸灭活 6 0min ,用 80 %的乙醇萃提 ,调节 pH至 6 5 ,过柱层析分离后得到的SMCS含量能达到 4 0 %以上。此工艺条件对SMCS的提取分离效果较好且操作简便。 展开更多
关键词 洋葱/化学 SMCS 中药制药工艺 HPLC 正交试验法
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Selection of Strains Producing Lipase with Transesterification Activity and Its Characterization
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作者 Gabriel Luls Castighoni Jorge Alberto Vieira Costa +1 位作者 Giovana da Silva Padilha Ranulfo Monte-Alegre 《Journal of Chemistry and Chemical Engineering》 2016年第2期68-76,共9页
The interest for lipase production is due to the ability of this enzyme to catalyze some reactions, such as the transesterification. Although industrial biodiesel is produced chemically, there are several problems ass... The interest for lipase production is due to the ability of this enzyme to catalyze some reactions, such as the transesterification. Although industrial biodiesel is produced chemically, there are several problems associated with this technology that can be prevented through the use of lipases. The present work aimed to select microorganisms with potential for production of lipase with transesterification activity. The lipase from Burkholderia cepacia was the one with the most promising results for this type of reaction, showing results of hydrolytic activity at 37 ℃and pH 8.0. The pH and volume of crude enzyme extract that showed favorable for synthesis ofbiodiesel is at about pH 6.0 and 3.75 mL, respectively, which represents approximately 42% of water in the system, ensuring the conversion of nearly 60% to biodiesel. 展开更多
关键词 BIODIESEL Burkholderia cepacia CHARACTERIZATION LIPASE transesterification.
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