title: Optimization of immobilization for selective oxidation of benzyl alcohol by Gluconobacter oxydans using response surface methodology.
abstract: This study used the Box-Behnken design and response surface methodology to optimize immobilization of Gluconobacter oxydans in Ca-alginate gel for the production of benzaldehyde in a biphasic system. Immobilization parameters, such as Na-alginate concentration, cell load, and bead diameter, were optimized. The mathematical model developed was validated and proven to be statistically adequate and accurate in predicting the response. For both activity and stability responses, the best results were achieved at alginate concentration of 2.55% (w/v), cell load of 49.26 mg/ml, and 2.2 mm bead diameter. Under these conditions, retention activity of 87.6% could be attained for the immobilized cell. In addition, the oxidative activity of immobilized cells was retained at 53.2% compared with that of free cells after 10 repeated batch reactions, while only 15.7% of activity remained in free cells.
authors.affiliation: New World Institute of Biotechnology, State Key Lab of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Wu
authors.forename: Jia-Le
authors.initials: JL
authors.lastname: Wang
authors.forename: Min-Hua
authors.initials: MH
authors.lastname: Li
authors.forename: Jin-Ping
authors.initials: JP
authors.lastname: Lin
authors.forename: Dong-Zhi
authors.initials: DZ
authors.lastname: Wei
mesh_terms: D000704:Analysis of Variance; D001547:Benzaldehydes / Q000378:metabolism; D019905:Benzyl Alcohol / Q000378:metabolism*; D001709:Biotechnology / Q000379:methods*; D018914:Cells, Immobilized / Q000166:cytology / Q000378:metabolism; D020600:Gluconobacter oxydans / Q000166:cytology* / Q000378:metabolism*; D008954:Models, Biological; D010084:Oxidation-Reduction; D059027:Recycling; D015203:Reproducibility of Results
chemical_list: D001547:Benzaldehydes; D019905:Benzyl Alcohol; C032175:benzaldehyde