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Structural studies of S-7, another exocellular polysaccharide containing 2-deoxy-arabino-hexuronic acid
Södertörn University, Avdelning Naturvetenskap.
2001 (English)In: Carbohydrate Research, ISSN 0008-6215, E-ISSN 1873-426X, Vol. 331, no 3, 285-290 p.Article in journal (Refereed) Published
Abstract [en]

The exocellular polysaccharide S-7, a heteropolysaccharide from Azotobacter indicus var, myxogenes has been studied using methylation analysis, Smith degradation, partial acid hydrolysis, NMR spectroscopy and mass spectrometry as the principal methods. It is concluded that the repeating unit has the following structure: -->4)-beta -D-Glcp-(1 -->4)-alpha -L-Rhap-(1 -->3)-beta -D-2-deoxy-arabino-HexpA-(1 --> 6 up arrow 1 beta -D-Glcp-(1 -->6)-beta -D-Glcp The absolute configuration of the deoxyhexuronic acid was deduced from H-1 NMR chemical shifts and is most likely D. Approximately two O-acetyl groups per repeating unit are present, one of which is presumably on the Rha residue. The structure bears great resemblance to another polysaccharide, recently studied, produced by Sphingomonas paucimobilis I-886.

Place, publisher, year, edition, pages
2001. Vol. 331, no 3, 285-290 p.
National Category
Biochemistry and Molecular Biology Chemical Sciences
Identifiers
URN: urn:nbn:se:sh:diva-15861DOI: 10.1016/S0008-6215(01)00050-7ISI: 000168214700008OAI: oai:DiVA.org:sh-15861DiVA: diva2:509053
Available from: 2012-03-12 Created: 2012-03-09 Last updated: 2012-03-12Bibliographically approved

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