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An investigation of pectin and pectic acid in dilute aqueous solution

✍ Scribed by Robert C. Jordan; David A. Brant

Publisher
Wiley (John Wiley & Sons)
Year
1978
Tongue
English
Weight
692 KB
Volume
17
Category
Article
ISSN
0006-3525

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✦ Synopsis

Abstract

Light‐scattering measurements have been carried out on carefully clarified aqueous solutions of pectin and pectic acid. The strong dependence of the inverse excess scattering intensity on angle yields pectin chain dimensions that are inconsistent with the complete molecular dispersion of pectin molecules possessing the degrees of polymerization indicated by the measured osmotic molecular weights. Negligible or negative concertration dependences of the inverse scattering intensities coupled with the centrifugation, filtration, and gel permeation chromatography behavior of the samples likewise suggest nonequilibrium aggregation of the pectin molecules in solution. It is shown that the measured mean polymer chain dimensions can be rationalized in terms of the presence of a very small proportion of aggregated material.

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