Nonuniformity of starch/nanosilica composites and interfacial behaviour of water and organic compounds |
| |
Authors: | VM Gun’ko VV Turov AA Turova VI Zarko |
| |
Institution: | a Chuiko Institute of Surface Chemistry, 17 General Naumov Str., Kiev 03164, Ukraine b Faculty of Chemistry, Maria Curie-Sk?odowska University, 20031 Lublin, Poland |
| |
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 200-280 K), FTIR (293 K), TG (293-573 K), TSDC (90-265 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 200-280 K. The energetic and structural boundaries between weakly (unfrozen at 250-260 < T < 273 K) and strongly (unfrozen at 200 < T < 250-260 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. |
| |
Keywords: | Fumed silica Starch Quercetin Bound water Interfacial behaviour NMR |
本文献已被 ScienceDirect 等数据库收录! |
|