4.7 Article

Synthesis and characterisation of starch cuprate

Journal

FOOD CHEMISTRY
Volume 129, Issue 3, Pages 1217-1223

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2011.05.114

Keywords

Microwave-assisted reactions; Potato starch; Cupration

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The cupration of granular potato starch with ammonium tetrachlorocuprate(II) was performed by a 20 min lasting microwave-assisted process and by 40 min convectional heating. In both cases the degree of esterification (DE) did not exceed 6.4 x 10(-3). A higher dose of cuprate had a positive effect on DE, regardless of whether the microwave irradiation or the convectional heating was applied, and on the thermal stability of the starch cuprate produced in the microwave-assisted way. As a result of cupration, the hydroxyl ligand of the starch D-glucose units was replaced by the chloride ligand of the tetrachlorocuprate(II) anion. In the starch cuprate formed in the microwave-assisted process, the cuprate anion additionally coordinated water molecules. The cupration reduced starch crystallinity, as indicated by X-ray diffractometry and differential scanning calorimetry. (C) 2011 Elsevier Ltd. All rights reserved.

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