Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5357859 | Applied Surface Science | 2010 | 6 Pages |
Abstract
Hydrated starch alone and in composition with nanosilica A-300 and quercetin (natural antioxidant) was studied in the form of powders (mechanical mixture) and gels using 1H NMR (at 200-280Â K), FTIR (293Â K), TG (293-573Â K), TSDC (90-265Â K) and quantum chemistry methods. Influence of weakly polar (chloroform-d, CDCl3) and polar ((CD3)2SO, DMSO) deuterated solvents on bound water structure in these systems was also analysed at 200-280Â K. The energetic and structural boundaries between weakly (unfrozen at 250-260Â <Â TÂ <Â 273Â K) and strongly (unfrozen at 200Â <Â TÂ <Â 250-260Â K) bound waters become nonabrupt after the addition of these solvents to quercetin/starch/nanosilica composites because of the differences in water interaction with these substances differently affecting its freezing point depression.
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Authors
V.M. Gun'ko, V.V. Turov, V.N. Barvinchenko, A.A. Turova, A.A. Rugal, V.I. Zarko, R. Leboda,