title: Isomerization and biodegradation of beta-cypermethrin by Pseudomonas aeruginosa CH7 with biosurfactant production.
abstract: Pseudomonas aeruginosa CH7, isolated from activated sludge, was able not only to isomerize and degrade beta-cypermethrin but also to utilize it as the sole source of carbon and energy for growth and produce biosurfactant. The strain effectively degraded beta-cypermethrin with inocula biomass of 0.1-0.2 g L(-1) at 25-35°C, pH 6-9, and a final concentration of beta-cypermethrin 25-900 mg L(-1). Via response surface methodology analysis, we found the optimal condition was 29.4°C, pH 7.0, and inocula biomass of 0.15 g L(-1); under these conditions, about 90% of the beta-cypermethrin could be degraded within 12 days. Noticeably, biosurfactant was detected in the MSM culture of strain CH7, suggesting that the biosurfactant (rhamnolipid) could potentially enhance the degradation of beta-cypermethrin by promoting the dissolution, adsorption, and absorption of the hydrophobic compounds. Therefore, CH7 may serve as a promising strain in the bioremediation of wastewater and soil polluted by beta-cypermethrin.
authors.affiliation: College of Resources and Environmental Sciences, China Agricultural University, Beijing 100094, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Zhang
authors.forename: Shenghui
authors.initials: S
authors.lastname: Wang
authors.forename: Yanchun
authors.initials: Y
authors.lastname: Yan
mesh_terms: D001673:Biodegradation, Environmental; D002851:Chromatography, High Pressure Liquid; D002855:Chromatography, Thin Layer; D004275:DNA, Ribosomal / Q000235:genetics; D008401:Gas Chromatography-Mass Spectrometry; D007536:Isomerism; D010802:Phylogeny; D011550:Pseudomonas aeruginosa / Q000235:genetics / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism*; D011722:Pyrethrins / Q000737:chemistry* / Q000302:isolation & purification*; D013501:Surface-Active Agents / Q000138:chemical synthesis*
chemical_list: D004275:DNA, Ribosomal; D011722:Pyrethrins; D013501:Surface-Active Agents; C017160:cypermethrin