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Abstract:

A homogeneous iota/nu-hybrid cairageenan (71% iota- and 21% nu-) isolated from Eucheuma denticulatum was used as a model compound to study the cyclization reaction of α-D-galactose 2,6-disulfate units to 3,6-anhydro-α-D- galactose 2-sulfate. The rate of cyclization, at 70°C, of this carrageenan is about 50 times faster than that of a porphyran (non-sulfated β-D-galactose linked to α-L-galactose 6-sulfate) and 210 times faster when compared with a lambda-carrageenan (2-sulfated β-D-units linked to α-D-galactose 2,6-disulfate). The use of this model compound confirms the previous hypothesis of the accelerating effect of the β-o-4-sulfate group as well as suggests the influence of the 2-sulfate of the α-D-galactose units on the 4C1 → 1C4 chair forms interchange. The easy of cyclization indicates that to produce commercial iota-carrageenans milder alkaline treatments could be used, avoiding degradation and increasing the gel strength. © 2004 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Alkali modification of carrageenans. Part V. the iota-nu hybrid carrageenan from Eucheuma denticulatum and its cyclization to iota-carrageenan
Autor:Viana, A.G.; Noseda, M.D.; Duarte, M.E.R.; Cerezo, A.S.
Filiación:Departamento de Bioquímica, Univ. Federal do Paraná, P.O. Box 19046, CEP 81531-990 Curitiba, Parana, Brazil
Depto. de Quim. Orgánica, Fac. de Ciencias Exactas y Naturales, Ciudad Universitária, Pabellón 2, 1428, Buenos Aires, Argentina
Palabras clave:Alkaline treatment; Cyclization rate; Eucheuma denticulatum; Iota-carrageenan; Alkaline earth metals; Degradation; Enzyme kinetics; Ethanol; Seaweed; Sol-gels; Alkaline treatment; Cyclization rate; Eucheuma denticulatum; Iota-carrageenan; Alkali metals; Eucheuma
Año:2004
Volumen:58
Número:4
Página de inicio:455
Página de fin:460
DOI: http://dx.doi.org/10.1016/j.carbpol.2004.08.006
Título revista:Carbohydrate Polymers
Título revista abreviado:Carbohydr Polym
ISSN:01448617
CODEN:CAPOD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01448617_v58_n4_p455_Viana

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Citas:

---------- APA ----------
Viana, A.G., Noseda, M.D., Duarte, M.E.R. & Cerezo, A.S. (2004) . Alkali modification of carrageenans. Part V. the iota-nu hybrid carrageenan from Eucheuma denticulatum and its cyclization to iota-carrageenan. Carbohydrate Polymers, 58(4), 455-460.
http://dx.doi.org/10.1016/j.carbpol.2004.08.006
---------- CHICAGO ----------
Viana, A.G., Noseda, M.D., Duarte, M.E.R., Cerezo, A.S. "Alkali modification of carrageenans. Part V. the iota-nu hybrid carrageenan from Eucheuma denticulatum and its cyclization to iota-carrageenan" . Carbohydrate Polymers 58, no. 4 (2004) : 455-460.
http://dx.doi.org/10.1016/j.carbpol.2004.08.006
---------- MLA ----------
Viana, A.G., Noseda, M.D., Duarte, M.E.R., Cerezo, A.S. "Alkali modification of carrageenans. Part V. the iota-nu hybrid carrageenan from Eucheuma denticulatum and its cyclization to iota-carrageenan" . Carbohydrate Polymers, vol. 58, no. 4, 2004, pp. 455-460.
http://dx.doi.org/10.1016/j.carbpol.2004.08.006
---------- VANCOUVER ----------
Viana, A.G., Noseda, M.D., Duarte, M.E.R., Cerezo, A.S. Alkali modification of carrageenans. Part V. the iota-nu hybrid carrageenan from Eucheuma denticulatum and its cyclization to iota-carrageenan. Carbohydr Polym. 2004;58(4):455-460.
http://dx.doi.org/10.1016/j.carbpol.2004.08.006