2014 Volume 20 Issue 2 Pages 375-383
Effects of cellulose, lignin and hemicellulose on the retrogradation of rice starch were investigated by RVA, Texture profile analysis, FTIR, XRD and SEM. Results showed that those three elements all delayed the retrogradation of rice starch. Among them, the best effect was hemicellulose, cellulose second, and lignin was the worst. RVA expressed that the addition group had lower but more stable pasting temperature and setback. Texture profile analysis demonstrated that the addition group had a lower hardness but higher adhesiveness. XRD analysis indicated that the addition group had no change in crystalline structure but had a lower degree of crystallinity being compared with the control group. FTIR revealed that addition of them had an interaction with starch by hydrogen-bond and a lower absorbance ratio (A1047/A1022). SEM confirmed that cellulose, lignin and hemicellulose will associate with starch, through reducing the chances of starch chains combining with themselves so as to retard staling.
