Isolation and structure of D-xylans from pericarp seeds of Opuntia ficus-indica prickly pear fruits |
| |
Authors: | Habibi Youssef Mahrouz Mostafa Vignon Michel R |
| |
Institution: | Centre de Recherches sur les Macromolécules Végétales, CNRS, and Université Joseph Fourrier, BP 53, F-38041 cedex 9, Grenoble, France. |
| |
Abstract: | Xylans were isolated from the pericarp of prickly pear seeds of Opuntia ficus-indica (OFI) by alkaline extraction, fractionated by precipitation and purified. Six fractions were obtained and characterized by sugar analysis and NMR spectroscopy. They were assumed to be (4-O-methyl-D-glucurono)-D-xylans, with 4-O-alpha-D-glucopyranosyluronic acid groups linked at C-2 of a (1-->4)-beta-D-xylan. The sugar composition and the 1H and 13C NMR spectra showed that their chemical structures were very similar, but with different proportions of D-Xyl and 4-O-Me-D-GlcA. Our results showed that, on average, the water soluble xylans have one nonreducing terminal residue of 4-O-methyl-D-glucuronic acid for every 11 to 14 xylose units, whereas in the water non-soluble xylans, xylose units can varied from 18 to 65 residues for one nonreducing terminal residue of 4-O-methyl-D-glucuronic acid. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|