Recent advances on formation, transformation, occurrence, and analytical strategy of modified mycotoxins in cereals and their products

•Modified mycotoxins in cereals can be formed by plant, microorganism, and processing.•Transformation of modified with free mycotoxins can occur during cereal processing.•Modified mycotoxins co-occur with free mycotoxins in cereals and their products.•Modified mycotoxins can be detected by direct and indirect methods.