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Kinetics and mechanism of the reaction of ammonium persulfate with ferulic acid and sugar-beet pectins

✍ Scribed by Jean-François Thibault; Carole Garreau; Dominique Durand

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
749 KB
Volume
163
Category
Article
ISSN
0008-6215

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✦ Synopsis

The actions of ammonium persulfate on (feruloylated) sugar-beet pectins and ferulate have been studied by spectrophotometry, viscometry, 'H-n.m.r. spectroscopy, and gel-permeation chromatography. The reactions followed a pseudo-firstorder law with respect to pectin and ferulate, whereas the order with respect to ammonium persulfate was unity for pectins and varied from 0.5 to >2 for ferulate. The rate constants mainly varied with the pH of the reaction mixture and there was an optimum at 3.8-5.7 for the gelation of the pectins. The results ruled out a simple condensation process between two ferulates (or feruloyl residues linked to the pectins) and suggested a free-radical polymerisation reaction.

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