Effects of Addition of Blocking Agents on Fluorescence Polarization Immunoassay of Okadaic Acid Using a Microfluidic Device

In analysis using microfluidic devices, adsorption of samples and other substances on the channel walls can be a problem. Especially in immunoassays using polydimethylsiloxane (PDMS) devices, the adsorption of antibodies and other substances to be measured greatly affects measurement performance. In this study, we investigated the effect of the addition of two blocking agents on the detection sensitivity of okadaic acid (OA), a diarrheal shellfish poison, by fluorescence polarization immunoassay. In addition, the dissociation constants for the antibody and tracer were calculated from the obtained calibration curve.