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Titolo:
Effect of polyelectrolyte counterion specificity on dextran sulfate-amphiphile interaction in water and aqueous/organic solvent mixtures
Autore:
Hugerth, A; Sundelof, LO;
Indirizzi:
Univ Uppsala, Ctr Biomed, S-75123 Uppsala, Sweden Univ Uppsala Uppsala Sweden S-75123 Ctr Biomed, S-75123 Uppsala, Sweden
Titolo Testata:
LANGMUIR
fascicolo: 11, volume: 16, anno: 2000,
pagine: 4940 - 4945
SICI:
0743-7463(20000530)16:11<4940:EOPCSO>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLY-ELECTROLYTE INTERACTIONS; HELIX-COIL TRANSITION; LINEAR CHARGE-DENSITY; AQUEOUS-SOLUTION; ALKYLTRIMETHYLAMMONIUM SURFACTANTS; DODECYLTRIMETHYLAMMONIUM IONS; SODIUM POLY(STYRENESULFONATE); ALKYLPYRIDINIUM CATIONS; ANTIDEPRESSANT DRUGS; BINDING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Hugerth, A Univ Uppsala, Ctr Biomed, Box 574, S-75123 Uppsala, Sweden UnivUppsala Box 574 Uppsala Sweden S-75123 23 Uppsala, Sweden
Citazione:
A. Hugerth e L.O. Sundelof, "Effect of polyelectrolyte counterion specificity on dextran sulfate-amphiphile interaction in water and aqueous/organic solvent mixtures", LANGMUIR, 16(11), 2000, pp. 4940-4945

Abstract

The effect of polyelectrolyte counterion specificity on the interaction between dextran sulfate (DxS) with a charge density corresponding to 0.43, 0.7, 1..3, and 1.6 sulfate groups per monosaccharide unit, respectively, and the cationic amphiphile amitriptyline (3-(10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-ylidene)-N,N-dimethyl-1-propanamine) was investigated by means ofa dialysis equilibrium technique in water and aqueous/organic solvent mixtures. The binding isotherms for amitriptyline to DxS with 30 mM LiCl, NaCl,KCl, RbCl, and CsCl, respectively, followed the counterion sequence Li+, Na+ > K+ > Rb+ approximate to Cs+ i.e., at the same free amphiphile concentration, the degree of bound amphiphile decreased according to the order given. This sequence was retained in aqueous methanol as well as aqueous l-propanol mixtures. Furthermore, on addition of organic solvent, the critical aggregation concentration increased and the cooperativity of the amphiphile aggregation decreased.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 03:43:36