Enhanced production of intracellular dextran dextrinase from Gluconobacter oxydans using statistical experimental methods

Enhanced production of intracellular dextran dextrinase from Gluconobacter oxydans using statistical experimental methods
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使用统计实验方法增强氧化葡糖杆菌细胞内葡聚糖糊精酶的产量

DOI:
10.5897/ajb09.1760
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发表时间:
2010-02
影响因子:
--
通讯作者:
毛相朝
毛相朝
中科院分区:
--
文献类型:
--
作者:
毛相朝

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采用两种统计学方法对氧化葡糖酸杆菌M5产DD酶的摇瓶发酵培养基进行了优化。通过Plackett-Burman筛选发现,葡萄糖、胰蛋白胨、酵母膏和氯化钠四个变量显著影响DDase的产生。选择四因素五水平中心复合设计(CCD)来解释四种培养基组分的组合效应。最佳培养基组成为葡萄糖(17.670 g/L)、麦芽二糖(30 g/L)、胰蛋白胨(12.198 g/L)、酵母膏(13.528 g/L)、硝酸铵(15 g/L)、硫酸铜(0.01 g/L)、硫酸锌(0.01 g/L)和氯化钠(0.009 g/L);灭菌前设定初始pH 6.0。在优化培养基中,酶产量提高了17倍左右(0.238 U/mL)。在此优化条件下,实验值与预测值吻合较好,表明所选用的培养基组成优化方法是有效的,且相对简单,省时省料。
Optimization of the fermentation medium for DDase production by Gluconaobacter oxydans M5 was carried out in the shake flasks using two kinds of statistical methods. Four variables, namely glucose, tryptone, yeast extract and sodium chloride, were found to influence DDase production significantly by the Plackett-Burman screening. A four-factor five-level central composite design (CCD) was chosen to explain the combined effects of the four medium constituents. The optimum medium consisted of glucose (17.670 g/L), maltobiose (30 g/L), tryptone (12.198 g/L), yeast extract (13.528 g/L), ammonium nitrate (15 g/L), copper sulfate (0.01 g/L), zinc sulfate (0.01 g/L), and sodium chloride (0.009 g/L); the initial pH 6.0 was set prior to sterilization. The DDase yield obtained from optimized medium increased by 17-fold (0.238 U/mL) or so. Under these optimal conditions, the experimental values agreed with the predicted values, indicating that the chosen method of optimization of medium composition was efficient, relatively simple, time reducing and material saving.
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