title: Influence of medium components on elastase production using crude sources by Bacillus sp. EL31410.
abstract: A newly isolated strain EL31410, producing elastase (E.C3.4.4.7) with high elastolytic activity was identified as Bacillus sp. In the medium optimization, it was found that wheat bran and soybean flour hydrosate were the best crude carbon and nitrogen source for enzyme production, respectively. Addition of corn steep flour can affect the bacterium growth and elastase production. A fractional factorial design was applied to study the main factors that affect the enzyme production, and central composite experimental design and response surface methodology were adopted to derive a statistical model for the effect of wheat bran and soybean flour hydrosate on elastase production. The experimental results showed that wheat bran had positive effect but soybean flour hydrosate had negative effect, on enzyme production. An initial concentration of 3.4% (w/v) wheat bran and 9.4% (v/v) soybean flour hydrosate were found to be optimal for enzyme production in batch culture. The time course of elastase production in the optimized medium composition was also described.
authors.affiliation: Department of Food Science and Nutrition, Zhejiang University, Hangzhou 310029, China. gqhe@zju.edu.cn
authors.forename: Guo-Qing
authors.initials: GQ
authors.lastname: He
authors.forename: Qi-He
authors.initials: QH
authors.lastname: Chen
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.forename: Xiao-Jie
authors.initials: XJ
authors.lastname: Liu
mesh_terms: D001407:Bacillus / Q000145:classification / Q000254:growth & development* / Q000378:metabolism*; D019149:Bioreactors; D002244:Carbon / Q000378:metabolism*; D002384:Catalysis; D002478:Cells, Cultured; D020650:Combinatorial Chemistry Techniques / Q000379:methods*; D003470:Culture Media / Q000378:metabolism*; D004043:Dietary Fiber / Q000378:metabolism; D002523:Edible Grain / Q000378:metabolism; D004549:Elastin / Q000378:metabolism; D004789:Enzyme Activation; D005240:Feasibility Studies; D005433:Flour; D005947:Glucose / Q000378:metabolism; D008954:Models, Biological; D008956:Models, Chemical; D017672:Nitrogen Compounds / Q000378:metabolism*; D010196:Pancreatic Elastase / Q000096:biosynthesis* / Q000378:metabolism; D011786:Quality Control; D012016:Reference Values; D012107:Research Design; D012680:Sensitivity and Specificity; D013025:Glycine max / Q000378:metabolism; D013045:Species Specificity; D013379:Substrate Specificity; D003313:Zea mays / Q000378:metabolism
chemical_list: D003470:Culture Media; D004043:Dietary Fiber; D017672:Nitrogen Compounds; D002244:Carbon; D004549:Elastin; D010196:Pancreatic Elastase; D005947:Glucose