ISSN:
0022-3832
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
A number of examples are presented to show that cationic dyes bind to polymeric acids by simple electrostatic forces. Competitive binding for the substrate is illustrated by the addition of hydrogen ions, calcium ions, and streptomycin. Anionic binding to uncharged or to negatively charged substrates is attributed to hydrogen bonding with the carbonyl groups of the substrate. Van der Waals' forces also play an important role in the binding. Illustrations are given for the substrates, native serum albumin, denatured ovalbumin, polyvinylpyrrolidone, and water-soluble urea-formaldehyde resin. In the last-named case the binding increases with increasing molecular weight of the substrate. A new fluorometric technique for following the binding of anions is described. The changes in spectral and photochemical properties which dyes undergo when bound are summarized.
Zusätzliches Material:
5 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/pol.1955.120168213
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