title: Effects of Two Surfactants and Beta-Cyclodextrin on Beta-Cypermethrin Degradation by Bacillus licheniformis B-1.
abstract: The biodegradation efficiency of beta-cypermethrin (β-CY) is low especially at high concentrations mainly due to poor contact between this hydrophobic pesticide and microbial cells. In this study, the effects of two biodegradable surfactants (Tween-80 and Brij-35) and β-cyclodextrin (β-CD) on the growth and cell surface hydrophobicity (CSH) of Bacillus licheniformis B-1 were studied. Furthermore, their effects on the solubility, biosorption, and degradation of β-CY were investigated. The results showed that Tween-80 could slightly promote the growth of the strain while Brij-35 and β-CD exhibited little effect on its growth. The CSH of strain B-1 and the solubility of β-CY were obviously changed by using Tween-80 and Brij-35. The surfactants and β-CD could enhance β-CY biosorption and degradation by the strain, and the highest degradation was obtained in the presence of Brij-35. When the surfactant or β-CD concentration was 2.4 g/L, the degradation rate of β-CY in Brij-35, Tween-80, and β-CD treatments was 89.4%, 50.5%, and 48.1%, respectively. The half-life of β-CY by using Brij-35 was shortened by 69.1 h. Beta-CY content in the soil with both strain B-1 and Brij-35 decreased from 22.29 mg/kg to 4.41 mg/kg after incubation for 22 d. This work can provide a promising approach for the efficient degradation of pyrethroid pesticides by microorganisms.
authors.affiliation: College of Light Industry, Textile & Food Engineering, Sichuan University , 610065, Chengdu, Sichuan, P. R. China.
authors.forename: Jiayuan
authors.initials: J
authors.lastname: Zhao
authors.affiliation: College of Light Industry, Textile & Food Engineering, Sichuan University , 610065, Chengdu, Sichuan, P. R. China.
authors.forename: Yuanlong
authors.initials: Y
authors.lastname: Chi
authors.affiliation: College of Light Industry, Textile & Food Engineering, Sichuan University , 610065, Chengdu, Sichuan, P. R. China.
authors.forename: Fangfang
authors.initials: F
authors.lastname: Liu
authors.affiliation: College of Light Industry, Textile & Food Engineering, Sichuan University , 610065, Chengdu, Sichuan, P. R. China.
authors.forename: Dongying
authors.initials: D
authors.lastname: Jia
authors.affiliation: College of Light Industry, Textile & Food Engineering, Sichuan University , 610065, Chengdu, Sichuan, P. R. China.
authors.forename: Kai
authors.initials: K
authors.lastname: Yao
mesh_terms: D001407:Bacillus / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D001673:Biodegradation, Environmental; D006207:Half-Life; D057927:Hydrophobic and Hydrophilic Interactions; D007306:Insecticides / Q000378:metabolism*; D007700:Kinetics; D011092:Polyethylene Glycols / Q000494:pharmacology; D011136:Polysorbates / Q000494:pharmacology; D011722:Pyrethrins / Q000378:metabolism*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000378:metabolism; D012995:Solubility; D013501:Surface-Active Agents / Q000494:pharmacology*; D047392:beta-Cyclodextrins / Q000493:pharmacokinetics*
chemical_list: D007306:Insecticides; D011136:Polysorbates; D011722:Pyrethrins; D012987:Soil; D012989:Soil Pollutants; D013501:Surface-Active Agents; D047392:beta-Cyclodextrins; C017160:cypermethrin; D011092:Polyethylene Glycols; C031215:betadex; C515901:Brij 35
keywords: Bacillus licheniformis B-1; beta-cyclodextrin; beta-cypermethrin; biodegradation; surfactants