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Production and characterization of glucoamylase from fungus Aspergillus awamori expressed in yeast Saccharomyces cerevisiae using different carbon sources

机译:使用不同碳源在酿酒酵母中表达的泡盛曲霉曲霉的葡糖淀粉酶的生产和表征

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摘要

Glucoamylase is widely used in the food industry to produce high glucose syrup, and also in fermentation processes for production beer and ethanol. In this work the productivity of the glucoamylase of Aspergillus awamori expressed by the yeast Saccharomyces cerevisiae, produced in submerged fermentation using different starches, was evaluated and characterized physico-chemically. The enzyme presented high specific activity, 13.8 U/mgprotein or 2.9 U/mgbiomass, after 48 h of fermentation using soluble starch as substrate. Glucoamylase presented optimum activity at temperature of 55°C, and, in the substratum absence, the thermostability was for 1h at 50°C. The optimum pH of activity was pH 3.5 - 4.0 and the pH stability between 5.0 and 7.0. The half life at 65°C was at 30.2 min, and the thermal energy of denaturation was 234.3 KJ mol-1. The hydrolysis of different substrate showed the enzyme’s preference for the substrate with a larger polymerization degree. The gelatinized corn starch was the substratum most susceptible to the enzymatic action.
机译:葡糖淀粉酶广泛用于食品工业中以生产高葡萄糖糖浆,还用于发酵过程中以生产啤酒和乙醇。在这项工作中,使用不同的淀粉在深层发酵中产生的酿酒酵母酵母所表达的泡盛曲霉的葡糖淀粉酶的生产率进行了评估,并进行了物理化学表征。在使用可溶性淀粉作为底物发酵48小时后,该酶表现出高比活度,即13.8 U / mg蛋白或2.9 U / mg生物量。葡糖淀粉酶在55°C的温度下具有最佳活性,在没有基质的情况下,其热稳定性在50°C持续1h。活性的最佳pH为pH 3.5-4.0,pH稳定性为5.0-7.0。 65℃下的半衰期为30.2min,变性的热能为234.3KJ mol s -1。不同底物的水解显示出酶对聚合度更高的底物的偏爱。糊化的玉米淀粉是最易受酶促作用的基质。

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