Molecular characteristics and physicochemical properties of very small granule starch isolated from Agriophyllum squarrosum seeds. (1st December 2021) - Han, Lihong
Abstract: Novel starch resources isolated from accessible botanical origins are of special interest to food scientists in the context of food security. In this study, Agriophyllum squarrosum starches (AS-1, AS-2, and AS-3) were isolated from three ecotypes of A. squarrosum seeds and compared with quinoa starch (QS). The mean particle diameter of AS granules ranged from 1.12 to 1.15 μm, and AS amylopectin had a significantly higher M w than QS ( p < 0.05). Compared with QS, AS samples had more branching and substitution of amylopectin structures. The peak viscosity, breakdown viscosity, and swelling degree of the AS samples were significantly lower than those of QS ( p < 0.05). AS showed a lower crystalline degree and higher gelatinization temperatures, and the freshly cooked AS showed a slower digestibility rate than QS. The physicochemical properties and chain profiles of AS facilitate the application of AS and the domestication of A. squarrosum crops. Graphical abstract: Unlabelled Image Highlights: Three A. squarrosum starches (ASs) and quinoa starch (QS) were isolated and studied. AS granules were spherical in shape with a mean particle diameter range of 1.12–1.15 μm. AS samples had higher Mw value and more substituted branching structures than QS. AS amylopectin contained more short external chains and less long unit chains. Viscosity and thermal properties of AS correlated with its molecular characteristics.