Chenglu Bi

Publications (3)9.71 Total impact

• Article: Determination of Etofenprox in environmental samples by HPLC after anionic surfactant micelle-mediated extraction (coacervation extraction).

  Guifang Jia, Chenglu Bi, Qiuxia Wang, Jing Qiu, Wenjing Zhou, Zhiqiang Zhou
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  ABSTRACT: A method is described for determination of residues of the insecticide Etofenprox in environmental samples. Anionic surfactant micelle-mediated extraction (coacervation extraction) was evaluated for isolation of Etofenprox before HPLC. The optimum conditions used for extraction included: 0.09 g sodium dodecanesulfonate (SDoS), 3.1 mL (3.3, for concentrations below 0.04 mg L(-1)) 12 mol L(-1) HCl, 5 min vortex stirring, 5 min centrifugation at 4000 rpm, 2 h equilibration time. The limits of quantification (LOQ) and detection (LOD) were 0.01 and 0.004 mg L(-1), respectively, and recoveries obtained from five real samples ranged from 94.33+/-2.48 to 100.13+/-2.71%. The precision of the method was good; relative standard deviations (RSD) were less than 7%.
  Analytical and Bioanalytical Chemistry 04/2006; 384(6):1423-7. · 3.78 Impact Factor
• Article: Stereoselective degradation kinetics of theta-cypermethrin in rats.

  Qiuxia Wang, Jing Qiu, Wentao Zhu, Guifang Jia, Junling Li, Chenglu Bi, Zhiqiang Zhou
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  ABSTRACT: The enantioselective degradation and chiral conversion of theta-cypermethrin (TCYM) in rats have been studied via intravenous (i.v.) injection. The degradation kinetics and the enantiomer fraction (EF) were determined by means of normal-phase high-performance liquid chromatography (HPLC) with diode array detection (DAD) and a cellulosetris-(3,5-dimethylphenylcarbamate)-based chiral stationary phase (CDMPC-CSP). The degradation followed pseudo-first-order kinetics. The degradation of the (+)-TCYM was much faster than that of the (-)-TCYM in plasma, heart, liver, kidney, and fat after administration of racemic TCYM (rac-TCYM). The EFs were over 0.500 in these tissues and muscle. The results showed the conversion of (+)-enantiomer to (-)-enantiomer in plasma after injection of (-)- and (+)-TCYM separately. The results for the major differences in the degradation of the enantiomers may have some implication for the environmental and ecological risks assessment for chiral pesticides.
  Environmental Science and Technology 03/2006; 40(3):721-6. · 5.23 Impact Factor
• Article: Direct Optical Resolution of Chiral Pesticides by HPLC on Emamectin CSP under Normal Phase Conditions

  Chenglu Bi, Ercheng Zhao, Yu Liu, Jing Qiu, Prof. Zhiqiang Zhou
  Journal of Liquid Chromatography &amp Related Technologies 01/2006; 29(11):1601-1607. · 0.71 Impact Factor