alexa Galactomannan with novel structure produced by the coral endophytic fungus Aspergillus ochraceus.
Chemical Engineering

Chemical Engineering

Journal of Analytical & Bioanalytical Techniques

Author(s): Guo S, Mao W, Yan M, Zhao C, Li N,

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Abstract The homogeneous extracellular polysaccharide, AW1, was obtained from the fermented broth of the fungus Aspergillus ochraceus derived from coral Dichotella gemmacea. AW1 was a galactomannan with a molar ratio of mannose and galactose of 2.16:1.00 and a molecular weight of about 29.0kDa. The structure of AW1 was investigated by chemical and spectroscopic methods, including methylation analysis, one- and two-dimensional nuclear magnetic resonance (1D, 2D NMR) and electrospray mass spectrometry with collision-induced dissociation (ES-CID MS/MS) spectroscopic analyses. The results showed that the backbone of AW1 consisted of (1⟶2)-linked α-d-mannopyranose residues. The mannopyranose residues in the backbone were substituted at C-6 by the (1⟶)-linked α-d-mannopyranose units and (1⟶5)-linked β-d-galactofuranose oligosaccharides with different degrees of polymerization. The investigation demonstrated that AW1 was a novel galactomannan with different structural characteristics from other fungal galactomannans, and could be a potential resource of the (1⟶5)-linked β-d-galactofuranose oligosaccharides. Copyright © 2014 Elsevier Ltd. All rights reserved. This article was published in Carbohydr Polym and referenced in Journal of Analytical & Bioanalytical Techniques

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