Chemical methods (HPLC, GC/MS) for the control of pesticides in water at low concentrations are time-consuming, expensive and need sample pre-concentration. Immunoassays offer the potential of rapid, inexpensive, sensitive and specific detection methods. This paper presents a flow injection system that is based on immunochemical reaction and which provides the opportunity for automated, quasi-continuous measurements for screening water samples for the presence of pesticides.
The method of flow injection immunoanalysis (FIIA) was compared with competitive ELISA (enzyme-linked immunosorbent assay). It is possible to measure in the range of interest of 0.1 ug litre-1, which is the limiting value of the European drinking water directive.
Measurements were made for the triazine herbicides atrazine and propazine, which both cross-react with the polyclonal antiserum used.
Furthermore, this device includes a new development of a membrane reactor for the exchange of used biological material, in this case antibodies. A brief comparison of ELISA and FIIA is presented, giving an overview of some aspects of the assays.
        
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Kramer PM, Schmid RD (1991) Automated quasi-continuous immunoanalysis of pesticides with a flow injection system Pest Sci32: 451-462