Effect of polyethylene glycols on the mobility of the polyphenolic constituents of wattle extract on cellulose

✍ Scribed by A.E. Russell; M. Corcoy; D.R. Cooper

• Publisher: Elsevier Science
• Year: 1973
• Tongue: English
• Weight: 522 KB
• Volume: 84
• Category: Article
• ISSN: 1873-3778
• DOI: 10.1016/s0021-9673(01)85376-0

✦ Synopsis

In a previous study, the effects of polyethylene glycols of increasing molecular weight in aqueous solution on the affinity of catechin on cellulose have beeninvestigated by paper chromatography.

In this paper, similar effects of the polyethylene gly-co1 series on theaffinityofthepolyphenolicconstituentsofwattleextractonpaperhave been investigated. As for catechin, the migration of the more mobile constituents increased with concentration and, in particular, with the degree of polymerization of the various glycols, conforming to the empirical expression

A,= Alnb

where A,and Ai are the activity functions for polymer and monomer, respectively (expressed as the molar change in & at infinite dilution), n is the number of repeat structural units in the molecule and b is a characteristic constant for the series. The rapid increase in mobility with polar group content of the polymers implicit in the above relationship is considered to be consistent with a mechanism involving cooperative hydrogen bonding of these groups to complementary sites on cellulose, resulting in competitive displacement of bound tannins.