Preparation of magnetic hyper-crosslinked polymer for high efficient preconcentration of four aflatoxins in rice and sorghum samples

Aflatoxins have carcinogenic effect on human health, developing effective adsorbents for their enrichment and detection is particularly required. A magnetic hyper-crosslinked polymer (MHCP-TPE) was prepared and used as a magnetic sorbent to adsorb and isolate aflatoxins from rice and sorghum samples prior to high performance liquid chromatography-fluorescence detection. MHCP-TPE exhibited good magnetic separation ability and reusability, with fast adsorption kinetics and quite good adsorption efficiency for the aflatoxins. At optimized conditions, a sensitive and reliable method was established for the determination of four aflatoxins (B1, B2, G1 and G2) in rice and sorghum samples. The limits of detection were 0.003-0.075 ng g-1 and 0.01-0.25 ng g-1 for rice and sorghum, respectively. Good method recoveries ranging from 83.0 % to 117 % were obtained, with relative standard deviations less than 8.0 %. This method offered a superior alternative to determine trace level of aflatoxins in cereal foods. MHCP-TPE holds great potential in separation science.