Abstract:

In order to explore the optimal harvesting season and drying method, the content changes of fumonisin B1 and aflatoxin B1, B2, G1 and G2 in husk, cob and grain of purple corn during mature period and different drying methods were determined by high performance liquid chromatography. Results indicated that the best time for harvesting purple corn was its plantation after 10 weeks; the husk of purple corn exhibited the highest content of anthocyanin and was easy to be dried at this harvesting time point. Microwave drying had strong detoxification capability, however, it also resulted in the loss of anthocyanin. Thus, microwave drying was not suitable for industrialized production. Airflow drying was suitable for kernels. The loss of anthocyanin in husk and cob of purple corn was less during sunlight drying. In addition, sunlight drying method could degrade 50% toxins. Therefore, sunlight drying is an economic drying method and suitable for industrialized production.

Key words: purple corn, anthocyanin, fumonisin, aflatoxin, drying