A fluorescence study on the gel-to-sol transition of kappa-carrageenan

Pekcan, O; Tari, O

doi:10.1016/j.ijbiomac.2004.05.002

A fluorescence study on the gel-to-sol transition of kappa-carrageenan

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Pekcan O., Tari O.

INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, vol.34, no.4, pp.223-231, 2004 (SCI-Expanded)

Publication Type: Article / Article
Volume: 34 Issue: 4
Publication Date: 2004
Doi Number: 10.1016/j.ijbiomac.2004.05.002
Journal Name: INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Page Numbers: pp.223-231
Istanbul Technical University Affiliated: No

Abstract

The fluorescence technique was employed to study gel-to-sol transitions in K-carrageenan systems with various carrageenan contents. Pyranine was used as a fluorescence probe for monitoring these transitions. Fluorescence, I-p and scattered light, I-sc intensities were measured against temperature to determine critical phase transition temperatures and exponents. It was observed that gel-to-sol transition temperatures, T-gs are found to be dependent to the carrageenan content. The measured critical exponents gamma' and beta' were found to be very close to the weight average degree of polymerization, DPw and gel fraction G, exponents (gamma and beta) of the classical Percolation Model. (C) 2004 Elsevier B.V. All rights reserved.