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A hydrodynamic study of the depolymerisation of a high methoxy pectin at elevated temperatures

Morris, Gordon, Foster, T. J. and Harding, S. E. (2002) A hydrodynamic study of the depolymerisation of a high methoxy pectin at elevated temperatures. Carbohydrate Polymers, 48 (4). pp. 361-367. ISSN 0144-8617

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Abstract

The hydrodynamic properties (intrinsic viscosity, [η]; infinite dilution sedimentation coefficient, s20,w0; weight average molecular weight, Mw and translational frictional ratio, f/f0) of a high methoxy pectin have been evaluated at various temperatures (20-60°C). A reduction in the value of all four hydrodynamic parameters is indicative of depolymerisation and is in agreement with an earlier study using viscometry [Axelos, M.A.V., & Branger, M., (1993). Food Hydrocolloids, 7, 91-102]. The apparent linearity of the Mark - Houwink plot of log[η] vs log Mw suggests that the conformation of the pectin molecule does not change significantly over the temperature range studied. The evaluation of the Mark-Houwink viscosity exponent (a = 0.84) indicates a moderately extended structure. This then allows the calculation of the number of Kuhn statistical lengths per chain from the adapted 'blob' theory of Dondos [Dondos A. (2001). Polymer, 42, 897-901]. The weight average number of Kuhn statistical lengths per chain is reduced from (170 ± 10) to (125 ± 10) when the temperature is increased from 20-60°C. This may be of significance as many high methoxy pectins are exposed to high temperatures during processing in both the food and pharmaceutical industries. © 2002 Elsevier Science Ltd. All rights reserved.

Item Type: Article
Uncontrolled Keywords: β-elimination Adapted 'blob' theory Depolymerisation Elevated temperature analytical ultracentrifugation High methoxy pectin Kuhn statistical chain length Conformations Depolymerization High temperature effects Hydrodynamics Molecular weight Viscosity Biopolymers
Subjects: Q Science > QD Chemistry
Schools: School of Applied Sciences
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Language of Original Document: English
Correspondence Address: Morris, G.A.; Industrial Research Limited, Gracefield Road, Lower Hutt, New Zealand; email: g.morris@irl.cri.nz
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Depositing User: Gordon Morris
Date Deposited: 13 May 2011 11:27
Last Modified: 04 Jul 2011 14:09
URI: http://eprints.hud.ac.uk/id/eprint/10440

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