Effects of Fermentation Modification and Combined Modification with Heat-Moisture Treatment on the Multiscale Structure, Physical and Chemical Properties of Corn Flour and the Quality of Traditional Fermented Corn Noodles

This study investigates the effects of fermentation modification and combined modification with heat-moisture treatment (HMT) on the multiscale structure, physical and chemical properties, and quality of corn flour in the production of traditional fermented corn noodles (TFCNs). The results indicate that after fermentation modification, the starch granule size decreased while the amylopectin proportion increased. Fermentation also enhanced the relative crystallinity and short-range order of the starch, along with an increase in resistant digestion components and ester content in the noodles. After combined modification with HMT, starch granules lost their spherical, intact structure, underwent melting and reorganization, and displayed an increase in particle size. These changes led to a significant improvement in the thermal stability and textural properties of corn flour, resulting in noodles with enhanced cooking quality. Furthermore, the combined modification significantly increased the contents of flavor compounds such as aldehydes, acids, and alcohols in the noodles while reducing olefin and alkane levels, thus contributing to improved flavor development. These findings demonstrate that fermentation modification and combined modification with HMT play a crucial role in enhancing the multiscale structure and physical and chemical properties of corn starch, thereby improving the quality of TFCN.