About this Journal Submit a Manuscript Table of Contents
International Journal of Carbohydrate Chemistry
Volume 2012 (2012), Article ID 459410, 9 pages
http://dx.doi.org/10.1155/2012/459410
Research Article

The Study of the Reaction of Pectin-Ag(0) Nanocomposites Formation

A.E. Favorsky Institute of Chemistry, Russian Academy of Sciences, Siberian Branch, Irkutsk 664033, Russia

Received 31 May 2012; Accepted 10 October 2012

Academic Editor: Yuriy A. Knirel

Copyright © 2012 Nadezhda Viktorovna Ivanova et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Pectin polysaccharides (PSs) were isolated from a bark of Larix sibirica Ledeb. Structure of PS fragments determined by chemical transformations, chromatography, and spectroscopic analyses was found to be a linear galacturonane comprising 1,4-linked α-D-GalpA residues and a rhamnogalacturonan I (RG-I). The fifth part of galacturonane residues was methyl esterified at at C-2 and/or C-3 and C-6 atoms. Some of RG-I side chains were identified as arabinogalactan subunits with highly branched structure consisting of linear backbone with 3,6)-β-D-Galp-(1 residues, substituted at C-6 by neutral side chains. This side chains contained 2,5)-α-L-Araf-(1 and 3,5)-α-L-Araf-(1 residues and terminal arabinose in the pyranose and furanose form. It was found that “pectin-Ag(0)” nanobiocomposites were formed via the interaction between PS aqueous solutions and silver nitrate, with PS playing both reducing and stabilizing functions. It was shown that the content of Ag(0) particles in “pectin-Ag(0)” depended on the reaction conditions and can range from 0.1 to 72 %, the size of Ag(0) particles being 3–27 nm. Using 13C NMR technique, it was revealed that PS underwent destructive changes and they they were more considerable, more than the lot of Ag(I) that was inputed into the reactionary medium.