Development of Food-Starch Granules Structured with Surface Coating

Abstract

We have developed a new production process for food-starch granules structured with surface coating. This process consists of two ideas, modifying with food materials and under the dry condition keeping with starch powder. We investigated the utilization of gellan-gum as a food material and the application of Agro Master (manufactured by Hosokawa Micron Corporation) as a dry-modifying machine. The surface microstructures of the modified starches were observed under an atomic force microscopy (AFM) to analyze the coating of starch granules. The starch surface treated with gellan-gum was a smooth structure and not the same as native starch surface, which showed a rough protruding structure, 5-20 nm height and 50̶150 nm diameter. The gelatinization properties of the starch treated with gellan-gum and then Ca-cation were analyzed. The swelling power and the soluble-sugar value were decreased with modifying combination of gellan-gum and then Ca-cation. These results indicate that the starch modified by structuring with surface coating shows the lower swelling and solubility of the granule during gelatinization.