USE OF ULTRAFILTRATION ON THE EVALUATION AND QUANTIFICATION OF THE INTERACTIONS BETWEEN POLYMERS AND LOW MOLECULAR-WEIGHT MOLECULES IN AQUEOUS SOLUTIONS

Moreno-Villoslada, I; Miranda, V; Oyarzun F.; Hess S.; Luna, M.; Rivas BL

Abstract

The theory and mathematical treatment of the evaluation of the interactions of water-soluble polymers with low molecular-weight molecules is presented. The interaction of the water-soluble polymer poly(sodium 4-styrenesulfonate) with L-tryptophan (Try), L-phenylalanine (Phe), chlorpheniramine maleate (CPM), and 2,3,5-triphenyl-2H-tetrazolium chloride (TTC) is studied by this technique. Ultrafiltration experiments at pH 7.5, and different ionic strength values show weak interactions of the low molecular weight molecules TTC and CPM with the polymer with apparent dissociation constants of 0.26 and 0.32 respectively in the absence of NaNO3, and 2.02 and 1.2 in the presence of 0.10 of NaNO3 and 0.13 M of NaCl respectively. Negligible interactions are found for Try or Phe at pHs ranging between 4 and 10 and NaNO3 concentrations ranging between 0.0 and 0.15 M. This suggests that the interactions are mainly due to both long-range electrostatic forces and short-range interactions that may include hydrophobic forces or charge transfer complexation. The interaction of TTC with PSS in the absence of NaNO3 is reflected in UV-Vis spectroscopic studies by a decrease on the intensity of the maximum at 248 nm

Más información

Título según WOS: Use of ultrafiltration on the evaluation and quantification of the interactions between polymers and low molecular-weight molecules in aqueous solutions.
Título según SCOPUS: Use of ultrafiltration on the evaluation and quantification of the interactions between polymers and low molecular-weight molecules in aqueous solutions
Título según SCIELO: USE OF ULTRAFILTRATION ON THE EVALUATION AND QUANTIFICATION OF THE INTERACTIONS BETWEEN POLYMERS AND LOW MOLECULAR-WEIGHT MOLECULES IN AQUEOUS SOLUTIONS
Título de la Revista: JOURNAL OF THE CHILEAN CHEMICAL SOCIETY
Volumen: 49
Número: 2
Editorial: 2013
Fecha de publicación: 2004
Página de inicio: 121
Página final: 126
Idioma: English
DOI:

10.4067/S0717-97072004000200003

Notas: ISI, SCIELO, SCOPUS