Journal
CARBOHYDRATE POLYMERS
Volume 124, Issue -, Pages 302-310Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.02.022
Keywords
Chemical modification; STMP; Aqueous ethanol; Aqueous acetone; Degree of cross-linking; RVA
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Funding
- Fonds Wetenschappelijk Onderzoek-Vlaanderen
- Methusalem programme 'Food for the future' (KU Leuven) [G.0557.12.]
- W.K. Kellogg Chair in Cereal Science and Nutrition at the KU Leuven
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Granular normal maize starch was reacted with sodium trimetaphosphate in deionized water (MSH2O), aqueous sodium sulfate solution (MSNa2SO4), aqueous ethanol (MSethanol) or aqueous acetone (MSacetone) under otherwise identical reaction conditions. Analysis of the resultant starches by Rapid Visco Analysis (RVA) showed that the starch was cross-linked to a higher degree in aqueous ethanol or aqueous acetone than in water or sodium sulfate solution, and with minimal starch leaching. While MSacetone and MSethanol had incorporated similar levels of phosphorous, RVA analysis and microscopic analysis showed that MSacetone were more effectively stabilized by cross-linking than MSethanol granules. Cross-linking in aqueous acetone is believed to either contain the greater numbers of distarch monophosphate (versus monostarch monophosphate), or occur more intensively at the granule outer layers than that in aqueous ethanol and, at the same time, to account for the greater granular strength of MSethanol than that of MSacetone. (C) 2015 Elsevier Ltd. All rights reserved.
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