High-affinity polyclonal antibodies directed against the synthetic cytokinin forchlorfenuron (CPPU) were produced from three immunizing haptens with equivalent spacer arms located at different positions. A competitive immunoassay was developed with a limit of detection in buffer of 12.42 +/- 3.06 ng/L. In addition, the ability of the produced antibodies to recognize a set of synthetic CPPU analogues was studied. It was evidenced that the linker position had a strong impact on the specificity of the generated polyclonals, which were more sensitive to changes at moieties of the target analyte located furthest from the derivatization site of the immunogen. Finally, matrix effects of gold and green kiwifruit over assay parameters were evaluated. Excellent recoveries and low coefficients of variation were found with just a 100-fold dilution of the sample in buffer, hence indicating the effectiveness of the developed immunoassay as an analytical tool for monitoring this agrochemical in kiwifruit samples.
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