title: Evaluation of various parameters of calcium-alginate immobilization method for enhanced alkaline protease production by Bacillus licheniformis NCIM-2042 using statistical methods.
abstract: Calcium-alginate immobilization method for the production of alkaline protease by Bacillus licheniformis NCIM-2042 was optimized statistically. Four variables, such as sodium-alginate concentration, calcium chloride concentration, inoculum size and agitation speed were optimized by 2(4) full factorial central composite design and subsequent analysis and model validation by a second-order regression equation. Eleven carbon, 11 organic nitrogen and seven inorganic nitrogen sources were screened by two-level Plackett-Burman design for maximum alkaline protease production by using optimized immobilized conditions. The levels of four variables, such as Na-alginate 2.78%; CaCl(2), 2.15%; inoculum size, 8.10% and agitation, 139 rpm were found to be optimum for maximal production of protease. Glucose, soybean meal and ammonium sulfate were resulted in maximum protease production at 644 U/ml, 720 U/ml, and 806 U/ml when screened for carbon, organic nitrogen and inorganic nitrogen sources, respectively, using optimized immobilization conditions. Repeated fed batch mode of operation, using optimized immobilized conditions, resulted in continuous operation for 12 cycles without disintegration of beads. Cross-sectional scanning electron microscope images have shown the growth pattern of B. licheniformis in Ca-alginate immobilized beads.
authors.affiliation: Bioengineering and Environmental Centre, Indian Institute of Chemical Technology (CSIR), Tarnaka, Hyderabad, India.
authors.forename: Ravichandra
authors.initials: R
authors.lastname: Potumarthi
authors.forename: Ch
authors.initials: Ch
authors.lastname: Subhakar
authors.forename: A
authors.initials: A
authors.lastname: Pavani
authors.forename: Annapurna
authors.initials: A
authors.lastname: Jetty
mesh_terms: D000464:Alginates / Q000737:chemistry*; D001407:Bacillus / Q000201:enzymology*; D001426:Bacterial Proteins / Q000737:chemistry*; D001671:Biochemistry / Q000379:methods; D001709:Biotechnology / Q000379:methods*; D003470:Culture Media; D010450:Endopeptidases / Q000737:chemistry*; D004800:Enzymes, Immobilized / Q000737:chemistry*; D005285:Fermentation; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D015233:Models, Statistical; D010447:Peptide Hydrolases / Q000737:chemistry; D012044:Regression Analysis; D015203:Reproducibility of Results; D012697:Serine Endopeptidases / Q000737:chemistry
chemical_list: D000464:Alginates; D001426:Bacterial Proteins; D003470:Culture Media; D004800:Enzymes, Immobilized; D006603:Hexuronic Acids; D020723:Glucuronic Acid; D010450:Endopeptidases; D010447:Peptide Hydrolases; D012697:Serine Endopeptidases; C087822:alkaline protease