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Polyelectrolyte complexes of carboxyl-containing polyanions: Stabilization of complexes in neutral and weakly acidic media and factors affecting this phenomenonстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Автор: Izumrudov V.A.
- Журнал: Polymer Science, Series A
- Том: 49
- Номер: 4
- Год издания: 2007
- Издательство: Pleiades Publishing, Ltd
- Местоположение издательства: Road Town, United Kingdom
- Первая страница: 456
- Последняя страница: 462
- DOI: 10.1134/S0965545X0704013X
- Аннотация: The stability of insoluble polyelectrolyte complexes formed by various carboxyl-containing polyanions with a positively charged partner - a linear polycation or protein - has been studied by means of turbidimetric titration. In most cases, acidification of the reaction medium leads to a significant strengthening of complexes against the action of the added salt in neutral or weakly acidic media. The data concerning the effect of the chemical nature of polymer components, the degree of polymerization, the density of charge, and the structure of their chains on the pH-dependent profiles of complex dissociation provide evidence that this effect is related to stabilization of the polyelectrolyte complex through the system of hydrogen bonds formed by carboxyl groups of a partially charged polyanion incorporated into the complex. Owing to a sharp and reversible change in the stability of systems at a pH and ionic strength of solution that are favorable for functioning of biopolymers (proteins, enzymes, antibodies, and nucleic acids), polycarboxylate polyelectrolyte complexes offer promise for solving practically important problems, for example, in biotechnology for separation of biological mixtures.
- Добавил в систему: izumrudov