General description of the structure of branched polymers

Gray-Weale, Angus and Gilbert, Robert G. (2009) General description of the structure of branched polymers. Journal of Polymer Science Part A - Polymer Chemistry, 47 15: 3914-3930. doi:10.1002/pola.23458

Author Gray-Weale, Angus
Gilbert, Robert G.
Title General description of the structure of branched polymers
Journal name Journal of Polymer Science Part A - Polymer Chemistry   Check publisher's open access policy
ISSN 0887-624X
Publication date 2009-08-01
Sub-type Article (original research)
DOI 10.1002/pola.23458
Volume 47
Issue 15
Start page 3914
End page 3930
Total pages 17
Editor Mitsuo Sawamoto
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Collection year 2010
Language eng
Subject C1
860199 Processed Food Products and Beverages (excl. Dairy Products) not elsewhere classified
090899 Food Sciences not elsewhere classified
Formatted abstract
A multidimensional distribution function is defined to describe the branching structure of branched homopolymers such as starch and polyacrylates. Averages of this function give distributions which can be measured using, for example, the number and weight distributions as a function of hydrodynamic volume from size-exclusion chromatography and field-flow fractionation, and two-dimensional separation methods. This provides means to plot data to obtain physically meaningful quantities, and to test mechanistic postulates for the (bio)synthesis, of branched polymers. A simple enzyme-kinetic model for a reduced form of this multidimensional distribution for starch biosynthesis is derived and solved. One application is to derive number distributions for the molecular weight distribution of debranched glycogen. Fitting this to experiment gives estimates of this ratio for two forms of glycogen. We propose that number distributions from size separation for starch (which, it is pointed out, are obtained directly from in-line viscometric detection) have a simple and meaningful form when plotted as ln(number distribution) against Vhp, where Vh is hydrodynamic volume, and p a parameter of order unity determined from multiple-detection size separation measurements. The new function is also used to propose a two-dimensional experiment which can yield an unambiguous measurement of the amylose: amylopectin ratio in starch.
Keyword Branched
Gel permeation chromatography (GPC)
Separation of polymers
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
Centre for Nutrition and Food Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 23 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 24 times in Scopus Article | Citations
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Created: Thu, 19 Nov 2009, 16:38:46 EST by Emma Cushworth on behalf of Centre for Nutrition and Food Sciences