Pasting properties of colored rice starch by ball-mill treatment

Abstract

Physically modified rice starch by ball-mill is important for making good quality bread, noodles, and several processed foods. The production of rice flour was done by ball-mill in an industrial scale. The effects of ball-mill treatment on the physicochemical properties of rice starch were investigated. The gel pasting properties of Joseongheugchal employed to ball-mill treatment showed that pasting time was 0.44 min shorter than that of the control and it also decreased peak viscosity (PKV), hot peak viscosity (HPV), and cold paste viscosity (CPV). In Hongjinju rice, RVA (rapid visco analyzer) pasting trace was characterized with high peak viscosity (3,448 RVU: rapid visco unit), and cold paste viscosity (2,975 RVU), also with high breakdown viscosity (1,597 RVU). The onset, peak, and conclusion gelatinization temperatures of ball-milled Josengheugchal rice starch were 57.4, 64.2, and 76.5°C, respectively, which were significantly higher than those of the control. The parameters of DSC (Differential scanning calorimetry) of ball-milled Hongjinju rice were 57.9, 65.1, and 77.3°C, respectively. The mean particle size of starch in both Josengheugchal and Hongjinju by ball-milling was decreased. The distribution of mean particle size in ball-milled rice starch was smaller in Josengheugchal than in Hongjinju compared to the native starch. As rice grains were ball-milled, the regions of amorphism were becoming larger and larger at the expense of crystalline regions, and diffraction peak patterns were decreased commonly in two colored rice cultivars. The 13C FT-solid state NMR patterns of starches showed dramatic chemical shifts of the 13C resonances by ball-milled treatment.