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A non-instrumental rapid test was developed for the screening of aflatoxin M1 (AfM1) in milk at the 40ng/L level. The method combines on one immunoaffinity gel layer, AfM1 pre-concentration and direct competitive immunoassay detection with visual evaluation. Aflatoxin B1-horse radish peroxidase (AfB1-HRP) and Sepharose 4B-immobilized anti-aflatoxin B1 monoclonal antibody with a 79% cross-reaction...