Influence of Pectin Fine Structure on the Mechanical Properties of Calcium-Pectin and Acid-Pectin Gels
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- 作者：Anna Strö ; m ; Pascual Ribelles ; Leif Lundin ; Ian Norton ; Edwin R. Morris ; Martin A. K. Williams
- 刊名：Biomacromolecules
- 出版年：2007
- 出版时间：September 2007
- 年：2007
- 卷：8
- 期：9
- 页码：2668 - 2674
- 全文大小：172K
- 年卷期：v.8,no.9(September 2007)
- ISSN：1526-4602
文摘
The in vitro and in vivo functionality of the anionic plant polysaccharide pectin depends not only on the amountof ion-binding groups attached to the polymer but also on the distribution of such groups along the backbone. Ithas been proposed recently that information regarding this intramolecular distribution can be quantified by defininga degree of blockiness (DB or DBabs), and the usefulness of such measures in discriminating qualitatively betweenpectins originating from different sources has been demonstrated. Despite this, the value of these parameters inpredicting the pseudoequilibrium elastic modulus of gels remains untested. This study seeks to address this problemthrough the sourcing and in-house modification of a variety of pectins in order to produce a library of distinctrepresentative fine structures. These were subsequently characterized in terms of their relevant properties, includingthe determination of the proposed DB and DBabs, and the formation of gels of these samples was monitored usingsmall deformation mechanical spectroscopy. In addition to ionotropic calcium gels the effect of the fine structureon acid gelation was also studied.