RSC Advances, 2016, vol 6, 109, pp. 107491-107497
DOI:10.1039/C6RA17922C
Abstract
Fully understanding the relationship between multi-scale structure and thermal properties of rice starch is important for starch-based food processing. Multi-scale structures of Indica rice starch were studied from molecules to aggregation structure. Gel-permeation chromatography (GPC) and high-performance anion-exchange chromatography (HPAEC) both show that the amylopectin from debranched rice starch exhibits bimodal distributions. Compared with amylose-rich rice starch, amylopectin-rich rice starch had the highest molar- and weight-based ratio of fraction faā² (DP 6ā12) and lower molar-based ratios of fractions fbā²3 (DP ā„ 37). X-ray diffraction (XRD) and small angle X-ray scattering (SAXS) confirm that amylopectin-rich starch has the highest crystallinity and scattering intensity. Differential scanning calorimetry (DSC) results show that amylopectin-rich starch has the highest onset and peak gelatinization temperatures; however, there is no significant difference in enthalpy, which may be due to the irregular double helix. Rapid visco-analysis (RVA) shows amylose-rich starch has a higher final and setback viscosity, which may be due to amylose molecule entanglement in starch gel and higher retrogradation ability.
