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Structure characterization of high molecular weight heteropolysaccharide isolated from Artemisia sphaerocephala Krasch seed

Guo, Q., Cui, S.W., Wang, Q., Hu, X., Wu, Y., Kang, J., Yada, R. (2011). Structure characterization of high molecular weight heteropolysaccharide isolated from Artemisia sphaerocephala Krasch seed, 86(2), 742-746. http://dx.doi.org/10.1016/j.carbpol.2011.05.018

Abstract

The structure of a high molecular weight heteropolysaccharide (60P) isolated from Artemisia sphaerocephala Krasch was elucidated using methylation analysis and 2D NMR spectroscopy. 60P (Mw: 551 kDa) was isolated from A. sphaerocephala Krasch (ASK) seeds, using hot water extraction and ammonium sulphate salt precipitation. Methylation and GC-MS analysis indicated that 60P was mainly composed of three types of sugar residues: 4-Xylp (27.8%), 2,4-Xylp (26.0%) and T-GlcpA (22.5%); small amount of 4-GalpA, 4-Glcp, T-Araf, T-Arap and 4, 6-GalpA were also detected with comparable molar ratio. Based on the results of monosaccharide composition, methylation analysis and NMR spectroscopy, a proposed structure is shown below: R represents one of the following groups: T-Araf, T-Arap, T-Araf → 3-Araf (1→ and T-Arap → 3-Araf (1→.© 2011 Elsevier Ltd All rights reserved.

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