title: Identification of variables and value optimization for optimum lipase production by Bacillus pumilus RK31 using statistical methodology.
abstract: In an effort to optimize the medium components, the statistical methodology was applied to achieve the optimum lipase production under shake flask conditions. The study was conducted in three steps on newly isolated Bacillus pumilus RK 31. In the first step, 12 different variables viz., Glucose, Olive oil, Yeast extract, Peptone, Tween 80, KH(2)PO(4), MgSO(4), NaNO(3), CaCl(2), Temperature, pH and Inoculum size were used to identify the most significant variables affecting lipase production using Plackett-Burman statistical design. Variance analysis showed that Olive oil, Tween 80 and KH(2)PO(4) played significant role in lipase production. In the second step, the values of the above-identified three variables were optimized by central composite design using three-level-three-factor approach. The optimum values of Olive oil, Tween 80 and KH(2)PO(4) were found to be 10.0ml/l, 5.0ml/l and 8.0g/l, respectively. KH(2)PO(4) was found to be responsible for maximum lipase production of 5.59IU/ml, experimental and 5.03IU/ml, predicted. In the third step, the optimum predicted values of the three factors and lipase production were verified by experimental approach. The amount of lipase produced in the designated medium was in agreement with that of predicted values by statistical method.
authors.affiliation: Department of Zoology and Biotechnology, H.N.B. Garhwal University, Srinagar (Garhwal) 246 174, Uttarakhand, India. rakesh_panchal1@yahoo.co.in
authors.forename: Rakesh
authors.initials: R
authors.lastname: Kumar
authors.forename: Shivani
authors.initials: S
authors.lastname: Mahajan
authors.forename: Arun
authors.initials: A
authors.lastname: Kumar
authors.forename: Deepak
authors.initials: D
authors.lastname: Singh
mesh_terms: D000704:Analysis of Variance; D001407:Bacillus / Q000187:drug effects / Q000201:enzymology*; D001709:Biotechnology / Q000379:methods*; D008049:Lipase / Q000096:biosynthesis*; D015233:Models, Statistical; D008969:Molecular Sequence Data; D000069463:Olive Oil; D010710:Phosphates / Q000494:pharmacology; D010938:Plant Oils / Q000494:pharmacology; D011136:Polysorbates / Q000494:pharmacology; D017680:Potassium Compounds / Q000494:pharmacology; D015203:Reproducibility of Results
chemical_list: D000069463:Olive Oil; D010710:Phosphates; D010938:Plant Oils; D011136:Polysorbates; D017680:Potassium Compounds; C013216:potassium phosphate; D008049:Lipase