Multiple length scale structure-property relationships of wheat starch oxidized by sodium hypochlorite or hydrogen peroxide

Carbohydrate Polymer Technologies and Applications

Bernadine M Flanagan¹  Michael J Gidley²  Sushil Dhital²  Madan Kumar Chapagai²  Torsten Witt³  Brenton Fletcher³ 

[1] Department of Chemical Engineering, Monash University, Clayton Campus, Victoria, Australia;Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, Queensland, 4072, Australia;School of Chemical Engineering, The University of Queensland, St Lucia, Queensland, 4072, Australia;

关键词: Wheat starch;    Oxidized starch;    Gelatinization;    Starch crystallinity;    Size exclusion chromatography;    Pasting properties;   

DOI  :  

来源: DOAJ

【 摘 要 】

Wheat is a potential source of oxidized starch, but there is no systematic study reporting the effects of oxidation conditions on the structural changes and subsequent physical properties. We report the properties of oxidized wheat starch granules treated with 2, 5, and 10% hydrogen peroxide (at pH 4 and 10) or sodium hypochlorite (at pH 4, 7, and 10). Increasing concentrations favored the formation of carbonyl groups by H2O2 and carboxyl groups by NaOCl. Granule morphology and molecular order were little affected, but increasing oxidant concentration reduced polymer size. Both oxidants influenced temperatures of gelatinization and caused major reductions in pasting viscosities. Principal component analysis (PCA) suggested that both functional group content and depolymerization contributed to the variations in gelatinization, pasting, and solubility properties. Controlled oxidation of wheat starch by H2O2 or NaOCl can produce oxidized starches of different functional properties useful in diverse potential applications.

【 授权许可】

Unknown