Rheological characterization of acid pectin samples in the absence and presence of monovalent ions
Journal article, 2014

Pectins are traditionally divided into two groups, high methoxy and low methoxy. The groupings determine the charge of the pectin and the gelation mechanism. However, not as yet extensively studied is the impact on gelation of the distribution of the charges as characterized by an absolute degree of blockiness (DBabs). The aim of this study was to characterize rheologically the acid gelation of a pectin with a high DBabs and a degree of methyl esterification of similar to 37%, in the absence and presence of monovalent ions. The results obtained suggest that a pectin with a blocky charge distribution at pH conditions close to or below the pKa exhibits weak gel-like properties at intermediate frequencies, despite the absence of a permanent network structure. The addition of monovalent ions changed the rheological behavior to resemble that of a strong gel whose properties depended on the type and concentration of the ions.

Fine structure

Entangled solution

Weak gels

Acid gelation

Random pectin

Blocky pectin


Anna Ström

Chalmers, Chemical and Biological Engineering, Pharmaceutical Technology

SuMo Biomaterials

E. Schuster

SIK – the Swedish Institute for Food and Biotechnology

S. M. Goh

Singapore Institute of Technology

Carbohydrate Polymers

0144-8617 (ISSN)

Vol. 113 336-343

Subject Categories

Polymer Technologies



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