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Viscometric Study of the Gelatin Solutions Ranging from Dilute to Extremely Dilute Concentrations.
- Source :
- Journal of Macromolecular Science: Physics; Aug2011, Vol. 50 Issue 8, p1481-1490, 10p, 6 Graphs
- Publication Year :
- 2011
-
Abstract
- The viscosity of gelatin solutions with concentrations between 10-4 and 10-5 g/cm3, covering the extremely dilute zones, was studied via a photoelectric viscometer, and the effects of the electrolyte, pH, surfactant, urea, and temperature were discussed. The results showed that the reduced viscosity (ηsp/C) of gelatin exhibited a drastic increase with dilution in the extremely dilute aqueous solutions, this being a typical polyelectrolyte effect. The reduced viscosity of gelatin underwent several oscillations with varying pH; the minimum value of the viscosity was at pH = 5.0, corresponding to its isoelectric point, where gelatin exhibited antipolyelectrolyte behavior. The reduced viscosity of gelatin decreased with increasing temperature, which was due to the helix-coil transition in the gelatin solution. The temperature of the helix-coil transition was 30.0°C in gelatin aqueous solution; however the temperature of helix-coil transition decreased to 20.0°C in urea. Upon cooling, the gelatin molecules in aqueous solution underwent a coil-helix transition. Hydrophobic interactions caused chain folding in the presence of the surfactant sodium dodecylsulphate. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222348
- Volume :
- 50
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Journal of Macromolecular Science: Physics
- Publication Type :
- Academic Journal
- Accession number :
- 62667265
- Full Text :
- https://doi.org/10.1080/00222348.2010.518540