Evaluation of single-point equations to determine intrinsic viscosity of sodium alginate and chitosan with high deacetylation degree

2017 ◽  
Vol 63 ◽  
pp. 427-433 ◽  
Author(s):  
Marcia Parente Melo da Costa ◽  
Marcia Cerqueira Delpech ◽  
Ivana Lourenço de Mello Ferreira ◽  
Maurício Tavares de Macedo Cruz ◽  
Jacira Aparecida Castanharo ◽  
...  
Keyword(s):  
Sodium Alginate ◽  
Intrinsic Viscosity ◽  
Single Point ◽  
Deacetylation Degree

Single point determination of intrinsic viscosity

1963 ◽  
Vol 7 (4) ◽  
pp. S30-S31 ◽  
Author(s):  
R. Z. Naar ◽  
H. H. Zabusky ◽  
R. F. Heitmiller
Keyword(s):  
Intrinsic Viscosity ◽  
Single Point ◽  
Point Determination

Single-point determination of intrinsic viscosity

1960 ◽  
Vol 4 (10) ◽  
pp. 92-94 ◽  
Author(s):  
R. J. Valles ◽  
M. C. Otzinger ◽  
D. W. Levi
Keyword(s):  
Intrinsic Viscosity ◽  
Single Point ◽  
Point Determination

Single point determination of intrinsic viscosity

1963 ◽  
Vol 7 (6) ◽  
pp. S30-S31 ◽  
Author(s):  
R. Z. Naar ◽  
H. H. Zabusky ◽  
R. F. Heitmiller
Keyword(s):  
Intrinsic Viscosity ◽  
Single Point ◽  
Point Determination

MOLECULAR WEIGHT AND HYDRODYNAMIC PROPERTIES OF SODIUM ALGINATE

1954 ◽  
Vol 32 (3) ◽  
pp. 227-239 ◽  
Author(s):  
W. H. Cook ◽  
David B. Smith
Keyword(s):  
Molecular Weight ◽  
Sodium Alginate ◽  
Intrinsic Viscosity ◽  
Diffusion Coefficients ◽  
Linear Relation ◽  
Hydrodynamic Properties ◽  
Viscosity Measurements ◽  
Molecular Weights ◽  
Extension Ratio ◽  
Good Agreement

Sedimentation, diffusion, and viscosity measurements were made on five unfractionated samples of sodium alginate ranging in intrinsic viscosity from 3.1 to 17.5. Diffusion coefficients were subject to large errors and are believed to be overestimated.Though the molecular weights obtained from sedimentation–diffusion (Svedberg equation) and sedimentation – intrinsic viscosity (Perrin–Simha equations) showed good agreement and yielded values of 3 to 21 × 104, higher values (4.6 to 37 × 104) from sedimentation–viscosity (Mandelkern–Flory equation) appear to be the better estimates. A linear relation between intrinsic viscosity and molecular weight was found with a slope (Mandelkern–Flory equation values) equivalent to Km = 13.9 × 10−3. The results indicate that sodium alginate has a relatively high extension ratio.

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