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Rheological characterization of acid pectin samples in the absence and presence of monovalent ions

Anna Ström (Institutionen för kemi- och bioteknik, Farmaceutisk teknologi ; SuMo Biomaterials) ; E. Schuster ; S. M. Goh
Carbohydrate Polymers (0144-8617). Vol. 113 (2014), p. 336-343.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Fine structure, Acid gelation, Blocky pectin, Random pectin, Weak gels, Entangled solution


This is an open access article under the CC BY-NC-ND license (http://creativecommons.orgilicenses/by-nc-nd/3.0/).



Denna post skapades 2014-11-25. Senast ändrad 2016-04-20.
CPL Pubid: 206515

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Farmaceutisk teknologi (2005-2014)
SuMo Biomaterials

Ämnesområden

Polymerteknologi

Chalmers infrastruktur