Counterion binding in partially neutralized poly(D-glutamic acid) and poly(DL-glutamic acid)

✍ Scribed by Shintaro Sugai; Katsutoshi Nitta

• Publisher: Wiley (John Wiley & Sons)
• Year: 1969
• Tongue: English
• Weight: 370 KB
• Volume: 7
• Category: Article
• ISSN: 0006-3525
• DOI: 10.1002/bip.1969.360070407

✦ Synopsis

Sodium counterion association with partially neutralized poly(D-glutamic acid) or poly(DL-glutamic acid) was measured by use of Wall's transference method with radioactive sodium. In the region where both polyacids are in completely random coil form, fractions of association were considerably less than that with poly(acrylic acid) in the same region of degree of neutralization. Even in the region where poly(D-glutamic acid) is in the helical form, the fraction of association was less than that with poly(acrylic acid) in the same region. No pronounced characteristics attributable to counterion association corresponding to the helii-coil transition could be found. The association phenomena were discussed on the basis of a rodlike model of polyelectrolyte.