共查询到19条相似文献,搜索用时 78 毫秒
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以提取过药用成分的杜仲叶渣为原料,提取杜仲胶。研究了分别用碱水解和酶解预处理杜仲叶渣,然后用溶剂提取杜仲胶,以及直接用溶剂提取杜仲胶的工艺。实验结果表明最佳工艺条件为:杜仲叶渣直接用正己烷作溶剂提取杜仲胶,原料与溶剂比例为1:20(g:mL),机械搅拌并加热回流浸提2h,趁热过滤,滤液放入冰箱在-20℃条件下冷却析晶1h,真空抽滤后自然干燥得到浅绿色杜仲胶产物,提取得率为4.42%。用丙酮多次精制得到白色的杜仲胶。对白色杜仲胶产物做红外光谱测定,确定为反式1,4-聚异戊二烯(TPI)。 相似文献
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酶法提取小檗碱工艺研究 总被引:9,自引:0,他引:9
用正交实验法研究了酶法提取小檗碱的最佳工艺条件。以小檗碱提取率为指标,分别考察了温度、时间、酶解pH值、加酶量对酶解反应的影响。确定了酶解黄连的最佳工艺条件:温度40℃、时间90 m in、pH 4.0、酶用量30 mg/g。在此条件下,对酶法提取小檗碱与传统乙醇浸提法进行比较,结果表明,酶法提取工艺比传统乙醇浸提法小檗碱产量提高了49%。 相似文献
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Zhanwei SUN Xiaoguo FU Hongzhang CHEN Yanhui WANG Runyu MA 《Frontiers of Chemical Engineering in China》2008,2(1):22-27
A novel method of enzymatic hydrolysis was developed in this paper to produce a high conversion yield and hydrolysis rate.
A comparison was described by using three methods of enzymatic hydrolysis and adsorption of steam exploded straw (SEWS): shaking
ball in the regime, shaking with stirrer bed, and static state. The most adequate filter-paper activity, speed and reaction
time were 3.6 × 10−27 mol/(s·mL), 150 r/min and 24 h, respectively, with the reducing sugar yield of 0.43. The results showed that the method of
shaking ball produced the highest adsorption, conversion yields and hydrolysis rate of the enzyme. This might be due to the
continuous frequency increase of enzyme adsorption and desorption on the substrate surface as well as the relieved end-product
inhibition. The morphological variation of SEWS was characterized by environmental scanning electron microscopy (ESEM).
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Translated from Journal of Beijing University of Chemical Technology, 2006, 33(6): 26-30 [译自: 北京化工大学学报] 相似文献
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SUN Zhanwei FU Xiaoguo CHEN Hongzhang WANG Yanhui MA Runyu 《Frontiers of Chemical Science and Engineering》2008,2(1):22
A novel method of enzymatic hydrolysis was developed in this paper to produce a high conversion yield and hydrolysis rate. A comparison was described by using three methods of enzymatic hydrolysis and adsorption of steam exploded straw (SEWS): shaking ball in the regime, shaking with stirrer bed, and static state. The most adequate filter-paper activity, speed and reaction time were 3.6 × 10-7 mol/(smL), 150 r/min and 24 h, respectively, with the reducing sugar yield of 0.43. The results showed that the method of shaking ball produced the highest adsorption, conversion yields and hydrolysis rate of the enzyme. This might be due to the continuous frequency increase of enzyme adsorption and desorption on the substrate surface as well as the relieved end-product inhibition. The morphological variation of SEWS was characterized by environmental scanning electron microscopy (ESEM). 相似文献