Development of chemiluminescent enzyme immunoassay for the determination of aflatoxin M 1 in milk products.

In this study, an indirect competitive chemiluminescent enzyme immunoassay (ic-CLEIA) for determining aflatoxin M1(AFM1) in milk products has been developed. A luminol–hydrogen peroxide chemiluminescence system catalysed by horseradish peroxidase (HRP) was used as the signal detecting system. The effects of several factors, including concentration and pH of phosphate buffer, dilution ratio of antibody and antigen and other relevant variables on the immunoassay, were studied and optimised by single-factor experiments. The developed method presented an IC50of 0.05 ng/mL, a detection limit of 0.01 ng/mL and a linear range from 0.018 to 0.13 ng/mL. This method has been successfully applied to the evaluation of AFM1in milk products, the recoveries ranging from 71.9% to 109.0%. A good correlation with the commercial available ELISA kit for AFM1(r= 0.9978) was obtained, indicating that the ic-CLEIA method developed can be used to determine AFM1in real samples. [ABSTRACT FROM PUBLISHER]