title: Isolation, identification and characterization of a novel Rhodococcus sp. strain in biodegradation of tetrahydrofuran and its medium optimization using sequential statistics-based experimental designs.
abstract: Statistics-based experimental designs were applied to optimize the culture conditions for tetrahydrofuran (THF) degradation by a newly isolated Rhodococcus sp. YYL that tolerates high THF concentrations. Single factor experiments were undertaken for determining the optimum range of each of four factors (initial pH and concentrations of K(2)HPO(4).3H(2)O, NH(4)Cl and yeast extract) and these factors were subsequently optimized using the response surface methodology. The Plackett-Burman design was used to identify three trace elements (Mg(2+), Zn(2+)and Fe(2+)) that significantly increased the THF degradation rate. The optimum conditions were found to be: 1.80 g/L NH(4)Cl, 0.81 g/L K(2)HPO(4).3H(2)O, 0.06 g/L yeast extract, 0.40 g/L MgSO(4).7H(2)O, 0.006 g/L ZnSO(4).7H(2)O, 0.024 g/L FeSO(4).7H(2)O, and an initial pH of 8.26. Under these optimized conditions, the maximum THF degradation rate increased to 137.60 mg THF h(-1) g dry weight in Rhodococcus sp. YYL, which was nearly five times of that by the previously described THF degrading Rhodococcus strain.
authors.affiliation: Institute of Microbiology, College of Life Science, Zhejiang University, 338 Yuhangtang Road, Hangzhou, Zhejiang 310058, China.
authors.forename: Yanlai
authors.initials: Y
authors.lastname: Yao
authors.forename: Zhenmei
authors.initials: Z
authors.lastname: Lv
authors.forename: Hang
authors.initials: H
authors.lastname: Min
authors.forename: Zhenhua
authors.initials: Z
authors.lastname: Lv
authors.forename: Huipeng
authors.initials: H
authors.lastname: Jiao
mesh_terms: D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D018929:Cell Culture Techniques / Q000379:methods*; D003198:Computer Simulation; D003470:Culture Media / Q000737:chemistry / Q000378:metabolism; D003627:Data Interpretation, Statistical; D005663:Furans / Q000302:isolation & purification / Q000378:metabolism*; D008954:Models, Biological; D015233:Models, Statistical; D012240:Rhodococcus / Q000145:classification* / Q000378:metabolism*; D013045:Species Specificity; D014874:Water Pollutants, Chemical / Q000302:isolation & purification* / Q000378:metabolism; D018508:Water Purification / Q000379:methods
chemical_list: D003470:Culture Media; D005663:Furans; D014874:Water Pollutants, Chemical; C018674:tetrahydrofuran