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  • Title: Modulation of rice starch physicochemical properties and digestibility: The role of highland barley non-starch polysaccharide fractions.
    Author: Zhang M, Xu S, Zuo Z, Xu H, Xu Q, Li T, Zhang X, Wang L.
    Journal: Int J Biol Macromol; 2024 Nov; 279(Pt 4):135206. PubMed ID: 39244124.
    Abstract:
    Highland barley non-starch polysaccharides (HBNP), particularly β-glucans, are known for their health-promoting effects, including modulation of glycemic response and enhancement of gut health. This study investigated the impact of different HBNP fractions on the properties and digestibility of high-glycemic index rice starch. HBNP was segmented into five fractions (HBNP-15, HBNP-30, HBNP-45, HBNP-60, and HBNP-75) using gradient ethanol precipitation, and these fractions exhibited varying molecular weights, monosaccharide compositions, and β-glucan contents. All fractions reduced rice starch's pasting viscosity, with 1 % HBNP-75 leading to a 99.1 % decrease in final viscosity. Morphological and size distribution analyses showed that HBNP fractions limited granule swelling and disrupted starch's continuous phase structure. HBNPs also reduced starch digestibility and increased the formation of resistant starch from 10 % to 28 %. These results suggest potential uses for HBNP fractions in developing low-glycemic starch-based foods.
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