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
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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
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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
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Volumen: | 58
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Número: | 4
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Página de inicio: | 455
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Página de fin: | 460
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DOI: |
http://dx.doi.org/10.1016/j.carbpol.2004.08.006 |
Título revista: | Carbohydrate Polymers
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Título revista abreviado: | Carbohydr Polym
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ISSN: | 01448617
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CODEN: | CAPOD
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01448617_v58_n4_p455_Viana |
Referencias:
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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