Effect of reaction solvents on the multi-scale structure of potato starch during acid treatment.

Authors :: Sun B
Tian Y
Wei B
Chen L
Bi Y
Jin Z
Source :: International journal of biological macromolecules [Int J Biol Macromol] 2017 Apr; Vol. 97, pp. 67-75. Date of Electronic Publication: 2017 Jan 03.
Publication Year :: 2017
Abstract: Potato starch was treated with 0.36% HCl in ethanol and water for various time periods, and its structural changes were evaluated and compared in this study. Acid-ethanol treated starch (AET-s) had relatively low average molecular weight (M <subscript>w</subscript> ) and z-average radius of gyration (R <subscript>g</subscript> ), and its solubility was higher than that of the counterpart acid-water treated starch (AWT-s). The granular appearance and differential scanning calorimetry (DSC) profile demonstrated that acid in ethanol and in water exhibited different attack pathways on the granules. No significant difference in crystallinity was observed for AET-s; however, the ratio of absorbance 1022/995cm <superscript>-1</superscript> and the peak intensity detected by small-angle X-ray scattering (SAXS) were increased with increasing treatment time. These results suggested that ethanol-acid treatment simultaneously attacked on the amorphous and crystalline regions, and the degradation extent on crystalline regions caused by ethanol-acid treatment was higher than that observed by acid-water treatment.<br /> (Copyright © 2017 Elsevier B.V. All rights reserved.)

Subjects :: Solubility
Temperature
Water chemistry
Hydrochloric Acid chemistry
Solanum tuberosum chemistry
Solvents chemistry
Starch chemistry
Sulfuric Acids chemistry

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