Light Scattering and Viscosity Investigation of Dilute Aqueous Solutions of Carboxymethyl Starch

Autor(en): Stojanovic, Zeljko P.
Jeremic, Katarina
Jovanovic, Slobodan
Nierling, Wolfgang
Lechner, M. Dieter
Stichwörter: AMYLOPECTIN; AMYLOSE; Aqueous salt solutions; Carboxymethyl starch; DERIVATIVES; DIMETHYL-SULFOXIDE; DISSOLUTION; EXAMPLES; Food Science & Technology; FRACTIONS; NONRANDOMLY BRANCHED MACROMOLECULES; PARTICULARITIES; Static light scattering; STRUCTURAL-PROPERTIES; Viscometry
Erscheinungsdatum: 2009
Herausgeber: WILEY-V C H VERLAG GMBH
Journal: STARCH-STARKE
Volumen: 61
Ausgabe: 3-4
Startseite: 199
Seitenende: 205
Zusammenfassung: 
Three samples of corn starch and three samples of potato starch were transformed to carboxymethyl starch (CMS) using a two-step etherification with sodium monochloroacetate in ethanol as the reaction medium. The degree of substitution (DS) of the synthesized samples was between 0.40 and 1.10. The structure parameters - solution properties relationships of the CMS samples were investigated by static light scattering and dilute solution viscometry in water and sodium-chloride aqueous solutions of different concentrations at 25 degrees C. The values of the mass average molar mass, M-W, radius of gyration, R-g, and second virial coefficient, A(2), were determined for all samples together with the limiting viscosity number. The results indicated that the M-w - R-g correlation was independent of the origin of the starch, as well as the exponent a(eta) and constant K-w from the Kuhn-Mark-Houwink equation. Values of the exponent nu for CMS in all sodium-chloride aqueous solutions were between 0.450 and 0.472, while for the CMS samples in aqueous solution the value of nu was 0.580. The values of the exponent a(eta) were around 0.3, which is typical for branched macromolecules.
ISSN: 00389056
DOI: 10.1002/star.200800085

Show full item record

Page view(s)

1
Last Week
0
Last month
0
checked on Feb 27, 2024

Google ScholarTM

Check

Altmetric