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IJBT Vol.06(3) [July 2007] >


Title: Hapten synthesis, generation of polyclonal antibodies and development of ELISA for determination of thiamethoxam residues in food and environmental samples
Authors: Ramesh, Atmakuru
Thirugnanam, Perumal Elumalai
Balakrishnamurthy, Prakhya
Keywords: ELISA
residues
thaimethoxime
water and food samples
hapten
polyclonal antibodies
Issue Date: Jul-2007
Publisher: CSIR
IPC CodeInt. Cl.⁸ C07K19/00; G01N33/53
Abstract: An ELISA (enzyme-linked immunosorbent assay) method for the determination of thiamethoxam residues has been developed. The method involves the synthesis of hapten and generation of polyclonal antibodies in rabbit using the hapten-protein (bovine serum albumin) conjugate carrier. Recovery experiments show the accuracy of estimation of thiamethoxam residues that was within the linear working range of 1 to 60 ng mL⁻¹ with the r²=0.992. Influence of different parameters, like detergent concentration, solvent, pH, ionic strength, has been studied. Cross reactivity was tested using different analogs. The method tolerates the solvent methanol concentration up to 15%. However, other polar solvents influence negatively on the binding. The detergent Tween 20 has not made any impact on the absorbance. The optimized ELISA for thiamethoxam used 1-60 ng/well and an antiserum dilution between 10000 and 200000. Recoveries were above 98%. The method was successfully applied for the analysis of food and environmental samples.
Page(s): 365-371
ISSN: 0972-5849
Source: IJBT Vol.06(3) [July 2007]

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