کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8333777 1540261 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An arabino(glucurono)xylan isolated from immunomodulatory active hemicellulose fraction of Salvia officinalis L.
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
An arabino(glucurono)xylan isolated from immunomodulatory active hemicellulose fraction of Salvia officinalis L.
چکیده انگلیسی
From the aerial parts of sage (Salvia officinalis L.) an arabino-(4-O-methyl-glucurono)-xylan (AGX) was isolated by alkaline extraction followed by precipitation with barium hydroxide solution. Polymer was isolated from sage as a light brown polysaccharide material of molecular mass (Mp) 84,000. Compositional analyses of sage AGX revealed xylose (81%), arabinose (10%), glucuronic acid (8%) and small amounts of hexoses (1%). Linkage sugar analyses showed the (1 → 4)-linked xylopyranosyl backbone with low degree of substitution (9-10%) at O-2 and O-3. Arabinofuranose residues were found as the terminal, 1,3-, 1,5- and 1,3,5-linked. NMR structural analyses of acidic oligomers, generated by partial acidic hydrolysis of AGX, confirmed a substitution of xylose residues by glucuronic acid and its 4-O-methyl derivate at O-2 at an average on every fourteenth xylose residue. NMR and FT-IR measurements, as well as a high negative optical rotation confirmed the β configuration of glycosidic linkages in AGX backbone.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Biological Macromolecules - Volume 59, August 2013, Pages 396-401
نویسندگان
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