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Vol. 131, Issue 8, August 2011, pp.91-100

 

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A Flow Injection Immunosensor for the Detection of Atrazine in Water Samples

 

1Shaveena THAKUR, 2Sonu GANDHI, 1A. K. PAUL, 2C. Raman SURI

1Central Scientific Instrument Organization, Sector 30-C, Chandigarh 160 030, India

(Council of Scientific and Industrial Research)

Tel.: ++91-172-2642545, fax: ++91-172-2642545

2 Institute of Microbial Technology, Sector 39-A, Chandigarh 160 036, India

(Council of Scientific and Industrial Research)

Tel.: ++91-172-2636680, fax: ++91-172-2690632

E-mail: paul_ak@rediffmail.com, raman@imtech.res.in

 

Received: 10 June 2011   /Accepted: 22 August 2011   /Published: 30 August 2011

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Abstract: Quantification of atrazine in a sample was performed using a post-reactive column consisting rabbit anti-immunoglobulin G for trapping atrazine specific antibodies bound to antigen and tracer. The assay is based on a competitive enzyme immunoassay where the analyte and known amount of tracer (peroxidase labeled hapten) bind competitively to available sites of anti-atrazine antibodies. The absorbance signal, proportional to the amount of antigen present, is generated with the unbound tracer passing through the column, and monitored continuously with a spectrophotometer. Several parameters which affect the immunosensor response were evaluated, including the flow rate through the column, stability of enzyme tracer in the column, for increasing the sensitivity of the system. The immunosensor has a detection limit of 1 ng/ml with good signal precision app. 2 % in the optimum working concentration range between 1 100 ng/ ml of atrazine in standard water samples.

 

Keywords: Atrazine, Flow-through immunosensor, Post-reactive column, Anti-atrazine antibody

 

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