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Abstract:

The role of the nature and concentration of counterions and coions on the conformation of κ-carrageenan is discussed; particularly, that of iodide compared with chloride based on the results obtained from optical rotation, viscometry and microcalorimetry. Iodide gives a more stable helical conformation, with a larger degree of order; at the same time, it represses aggregation of the helices and the gelation ability. Concerning the ordered conformation obtained in the presence of iodide colons, the results obtained are not conclusive. From the enthalpy of the conformational change, it seems that, even in the presence of iodide, the ordered conformation remains a double helix. On the other hand, no doubling of molecular weight was obtained by MALLS/GPC. Thus, this aspect remains still under discussion.

Registro:

Documento: Artículo
Título:On the specific role of coions and counterions on κ-carrageenan conformation
Autor:Ciancia, M.; Milas, M.; Rinaudo, M.
Filiación:Ctr. Rech. sur les Macromolec. Veg., CERMAV-CNRS, University Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
Depto. de Quim. Orgánica, Fac. de Ciencias Exactas y Naturales, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Palabras clave:Ionic interaction; Solution conformation; κ-carrageenan; carrageenan; chloride; iodide; article; conformational transition; microcalorimetry; molecular weight; optical rotation; viscometry
Año:1997
Volumen:20
Número:1
Página de inicio:35
Página de fin:41
DOI: http://dx.doi.org/10.1016/S0141-8130(97)01149-5
Título revista:International Journal of Biological Macromolecules
Título revista abreviado:INT. J. BIOL. MACROMOL.
ISSN:01418130
CODEN:IJBMD
CAS:carrageenan, 9000-07-1, 9049-05-2, 9061-82-9, 9064-57-7; chloride, 16887-00-6; iodide, 20461-54-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01418130_v20_n1_p35_Ciancia

Referencias:

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Citas:

---------- APA ----------
Ciancia, M., Milas, M. & Rinaudo, M. (1997) . On the specific role of coions and counterions on κ-carrageenan conformation. International Journal of Biological Macromolecules, 20(1), 35-41.
http://dx.doi.org/10.1016/S0141-8130(97)01149-5
---------- CHICAGO ----------
Ciancia, M., Milas, M., Rinaudo, M. "On the specific role of coions and counterions on κ-carrageenan conformation" . International Journal of Biological Macromolecules 20, no. 1 (1997) : 35-41.
http://dx.doi.org/10.1016/S0141-8130(97)01149-5
---------- MLA ----------
Ciancia, M., Milas, M., Rinaudo, M. "On the specific role of coions and counterions on κ-carrageenan conformation" . International Journal of Biological Macromolecules, vol. 20, no. 1, 1997, pp. 35-41.
http://dx.doi.org/10.1016/S0141-8130(97)01149-5
---------- VANCOUVER ----------
Ciancia, M., Milas, M., Rinaudo, M. On the specific role of coions and counterions on κ-carrageenan conformation. INT. J. BIOL. MACROMOL. 1997;20(1):35-41.
http://dx.doi.org/10.1016/S0141-8130(97)01149-5