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Abstract:

The cyclization reaction (formation of 3,6-anhydro-α-D-galactose and 3,6-anhydro-α-D-galactose 2-sulfate units from α-D-galactose 6-sulfate and 2,6-disulfate residues, respectively) of carrageenans follows a pseudo-first-order kinetics. This reaction can be carried out, at reasonable rates, in sodium hydroxide solutions less concentrated than those usually employed or by using a milder base such as sodium carbonate. Rate constants were also determined at a fixed sodium hydioxide concentration but using different ionic strengths. No specific salt effects were observed at a given sodium hydroxide concentration and ionic strength. © 1997 Elsevier Science Ltd. * To whom correspondence should be addressed.

Registro:

Documento: Artículo
Título:Alkaline modification of carrageenans. Part III. Use of mild alkaline media and high ionic strengths
Autor:Ciancia, M.; Matulewicz, M.C.; Cerezo, A.S.
Filiación:Depto. de Quim. Orgánica, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Palabras clave:Carbonates; Caustic soda; Ionic strength; Reaction kinetics; Salts; Sugars; Caraggeenans; Cyclization reaction; Sodium carbonate; Starch
Año:1997
Volumen:32
Número:3-4
Página de inicio:293
Página de fin:295
DOI: http://dx.doi.org/10.1016/S0144-8617(96)00130-0
Título revista:Carbohydrate Polymers
Título revista abreviado:Carbohydr Polym
ISSN:01448617
CODEN:CAPOD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01448617_v32_n3-4_p293_Ciancia

Referencias:

  • Ciancia, M., Matulewicz, M.C., Finch, P., Cerezo, A.S., Determination of the structures of cystocarpic carrageenans from Gigartina skottsbergii by methylation analysis and NMR spectroscopy (1993) Carbohydrate Research, 238, pp. 241-248
  • Ciancia, M., Noseda, M.D., Matulewicz, M.C., Cerezo, A.S., Alkali modification of carrageenans: Mechanism and kinetics in the kappa /iota-, mu /nu and lambda series (1993) Carbohydrate Polymers, 20, pp. 95-98
  • Haines, A.H., Relative reactivities of hydroxyl groups in carbohydrates (1976) Advances in Carbohydrate Chemistry and Biochemistry, 33, pp. 11-109
  • Lee, T.S., Special experimental methods for the determination of rate data, part 2, competing rections (1953) Technique of Organic Chemistry, 8, p. 100. , eds S. L. Friess and A. Weissberger. Interscience, New York
  • Matulewicz, M.C., Ciancia, M., Noseda, M.D., Cerezo, A.S., Carrageenan systems from tetrasporic and cystocarpic stages of Gigartina skottsbergii (1989) Phytochemistry, 28, pp. 2937-2941
  • Rees, D.A., Estimation of the relative amounts of isomeric sulfate esters in some sulfated polysaccharides (1961) Journal of the Chemical Society, pp. 5168-5171
  • Yaphe, W., Colormetric determination of 3,6-anhydrogalactose and galactose in marine polysaccharides (1960) Analytical Chemistry, 32, pp. 1327-1330

Citas:

---------- APA ----------
Ciancia, M., Matulewicz, M.C. & Cerezo, A.S. (1997) . Alkaline modification of carrageenans. Part III. Use of mild alkaline media and high ionic strengths. Carbohydrate Polymers, 32(3-4), 293-295.
http://dx.doi.org/10.1016/S0144-8617(96)00130-0
---------- CHICAGO ----------
Ciancia, M., Matulewicz, M.C., Cerezo, A.S. "Alkaline modification of carrageenans. Part III. Use of mild alkaline media and high ionic strengths" . Carbohydrate Polymers 32, no. 3-4 (1997) : 293-295.
http://dx.doi.org/10.1016/S0144-8617(96)00130-0
---------- MLA ----------
Ciancia, M., Matulewicz, M.C., Cerezo, A.S. "Alkaline modification of carrageenans. Part III. Use of mild alkaline media and high ionic strengths" . Carbohydrate Polymers, vol. 32, no. 3-4, 1997, pp. 293-295.
http://dx.doi.org/10.1016/S0144-8617(96)00130-0
---------- VANCOUVER ----------
Ciancia, M., Matulewicz, M.C., Cerezo, A.S. Alkaline modification of carrageenans. Part III. Use of mild alkaline media and high ionic strengths. Carbohydr Polym. 1997;32(3-4):293-295.
http://dx.doi.org/10.1016/S0144-8617(96)00130-0