Structural heterogeneity of wheat arabinoxylans revealed by Raman spectroscopy

Carbohydrate Research
C BarronXavier Rouau

Abstract

A set of arabinoxylan samples differing in their arabinose composition and various samples of arabino-xylo-oligosaccharide samples were analysed by Raman spectroscopy. Specific signatures for arabinose substitution were found in several spectral regions, that is, 400-600, 800-950 and 1030-1100 cm(-1). A linear relationship was observed between the peak ratio 855/895 cm(-1) of the second derivative spectra and the A/X ratio determined by chemical analysis. Moreover, spectral changes were observed in the 400-600 cm(-1) region assigned to the coupled vibrations mode in the skeleton: while the intensity of the band at 570 cm(-1) increased with the degree of substitution, that at 494 cm(-1) decreased. Similarly, a linear relationship was observed between the peak intensity ratio 570/494 cm(-1) calculated on the second derivative spectra and the composition data. Analysis of Raman spectra of arabino-xylo-oligosaccharides allowed to identify specific spectral features of disubstitution.

Citations

Feb 7, 2012·Biotechnology Advances·Feng PengRun-Cang Sun
Mar 25, 2019·Applied Microbiology and Biotechnology·Alei GengJianzhong Sun
Apr 20, 2019·International Journal of Biological Macromolecules·Asima ShahBilal Ahmad Ashwar
May 22, 2009·Journal of Agricultural and Food Chemistry·Xiao-Ling ZhouDongfeng Wang

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