کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1389600 982898 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Isolation and characterization of poly- and oligosaccharides from the red microalga Porphyridium sp.
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Isolation and characterization of poly- and oligosaccharides from the red microalga Porphyridium sp.
چکیده انگلیسی

The current study forms part of an ongoing research effort focusing on the elucidation of the chemical structure of the sulfated extracellular polysaccharide of the red microalga Porphyridium sp. (UTEX 637). We report here on the chemical structure of a fraction separated from an acidic crude extract of the polysaccharide, as investigated by methylation analysis, carboxyl reduction–methylation analysis, desulfation–methylation analysis, partial acid hydrolysis, Smith degradation, together with 1D and 2D 1H and 13C NMR spectroscopy. This fraction with a molar mass of 2.39 × 105 g mol−1 comprised d- and l-Gal, d-Glc, d-Xyl, d-GlcA, and sulfate groups in a molar ratio of 1.0:1.1:2.1:0.2:0.7. The almost linear backbone of the fraction is composed of (1→2)- or (1→4)-linked d-xylopyranosyl, (1→3)-linked l-galactopyranosyl, (1→3)-linked d-glucopyranosyl, and (1→3)-linked d-glucopyranosyluronic acid and comprises a possible acidic building unit:[(2 or 4)-β-d-Xylp-(l→3)]m-α-d-Glcp-(1→3)-α-d-GlcpA-(1→3)-l-Galp(l→Attached to the backbone are sulfate groups and nonreducing terminal d-xylopyranosyl and galactopyranosyl residues, which occur at the O-6 positions of Glc-derived moieties in the main chain.

Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Research - Volume 344, Issue 3, 17 February 2009, Pages 343–349
نویسندگان
, , , , , ,