Impedimetric sensor for toxigenic Penicilliumsclerotigenum detection in yam based on magnetite-poly(allylamine hydrochloride) composite

► A DNA biosensor for Penicillium sclerotigenum detection was obtained. ► The biosensor requires only small volumes and low concentrations of the analyte. ► EIS was successfully applied for detection of DNA sequences of toxigenic fungi. ► The sensor showed good specificity and sensitivity.