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Ochratoxin A (OTA) is one of the mycotoxins that often contaminate a variety of food stuffs, and it is a potential carcinogen for humans. Taking advantage of selective affinity binding and simple, rapid, and sensitive fluorescence polarization (FP)/fluorescence anisotropy (FA) analysis, here, we report two competitive FP/FA assays for OTA using tetramethylrhodamine (TMR)-labeled OTA as a fluorescence tracer and either antibody or aptamer as an affinity ligand to recognize OTA. In the absence of OTA, the TMR-labeled OTA binds with a larg
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