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Abstract:

Sequential extraction of tetrasporic Pterocladiella capillacea with water at room temperature and then at 50°C led to the isolation of two products that were each fractionated with cetrimide to give a soluble fraction and a precipitate. The precipitates were then subjected to fractional solubilization in solutions of increasing sodium chloride concentration. The whole treatment yielded two major fractions in each case, one soluble in the cetrimide medium and the other soluble in 0.5 M NaCl, which were further fractionated by anion-exchange chromatography. Structural analysis, carried out by methylation, desulfation-methylation, 13C NMR spectroscopy and determination of the absolute configuration of the 2,6-di-O-methylgalactose units in the permethylated products, indicated the presence of xylogalactans, with low content of 3,6-anhydrogalactose and low molecular weight. These polysaccharides varied in the level of xylopyranosyl and sulfate substitution, primarily on the 6-position of the 3-linked β-D-galactopyranosyl and on the 3-position of the 4-linked α-galactopyranosyl units. Moreover, herein we report, for the first time, the presence of 3-substituted, 4-linked D-galactopyranosyl residues in an alga belonging to the Gelidiales. © 2003 Elsevier Science Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Unusual structures in the polysaccharides from the red seaweed Pterocladiella capillacea (Gelidiaceae, Gelidiales)
Autor:Errea, M.I.; Matulewicz, M.C.
Filiación:Depto. de Quím. Orgán., Universidad de Buenos Aires, Pabellon 2-Ciudad Universitaria, 1428 Buenos Aires, Argentina
Palabras clave:Agarans; Galactans, D-galactose blocks; Galactans, sulfated; Gelidiales; Polysaccharide, red algal; Pterocladiella capillacea; Fractionation; Liquid chromatography; Molecular structure; Nuclear magnetic resonance spectroscopy; Plants (botany); Substitution reactions; Weed control; Sequential extraction; Polysaccharides; 2,6 di o methylgalactose; 3,6 anhydrogalactose; cetrimide; polysaccharide; sodium chloride; unclassified drug; alga; anion exchange chromatography; article; carbohydrate analysis; carbohydrate synthesis; carbon nuclear magnetic resonance; desulfurization; fractionation; isolation procedure; methylation; molecular weight; nonhuman; precipitation; priority journal; pterocladiella capillacea; room temperature; seaweed; solubilization; structure analysis; algae; Gelidiaceae; Gelidiales; Pterocladiella; Pterocladiella capillacea; Pterocladiella capillacea
Año:2003
Volumen:338
Número:9
Página de inicio:943
Página de fin:953
DOI: http://dx.doi.org/10.1016/S0008-6215(03)00037-5
Título revista:Carbohydrate Research
Título revista abreviado:Carbohydr. Res.
ISSN:00086215
CODEN:CRBRA
CAS:cetrimide, 57-09-0, 6899-10-1, 8044-71-1; sodium chloride, 7647-14-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00086215_v338_n9_p943_Errea

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Citas:

---------- APA ----------
Errea, M.I. & Matulewicz, M.C. (2003) . Unusual structures in the polysaccharides from the red seaweed Pterocladiella capillacea (Gelidiaceae, Gelidiales). Carbohydrate Research, 338(9), 943-953.
http://dx.doi.org/10.1016/S0008-6215(03)00037-5
---------- CHICAGO ----------
Errea, M.I., Matulewicz, M.C. "Unusual structures in the polysaccharides from the red seaweed Pterocladiella capillacea (Gelidiaceae, Gelidiales)" . Carbohydrate Research 338, no. 9 (2003) : 943-953.
http://dx.doi.org/10.1016/S0008-6215(03)00037-5
---------- MLA ----------
Errea, M.I., Matulewicz, M.C. "Unusual structures in the polysaccharides from the red seaweed Pterocladiella capillacea (Gelidiaceae, Gelidiales)" . Carbohydrate Research, vol. 338, no. 9, 2003, pp. 943-953.
http://dx.doi.org/10.1016/S0008-6215(03)00037-5
---------- VANCOUVER ----------
Errea, M.I., Matulewicz, M.C. Unusual structures in the polysaccharides from the red seaweed Pterocladiella capillacea (Gelidiaceae, Gelidiales). Carbohydr. Res. 2003;338(9):943-953.
http://dx.doi.org/10.1016/S0008-6215(03)00037-5