Immobilized pH gradient gel cell to study the pH dependence of drug lipophilicity

• Type: Article in International Scientific Journal
• Date: 2006

Authors

Lam, HT (Author) Other; Pereira, CM (Author) FCUP; Roussel, C (Author) Other; Carrupt, PA (Author) Other; Girault, HH (Author) Other

Journal

Title: Analytical Chemistry

Vol. 78

Pages: 1503-1508

ISSN: 0003-2700

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 29 Citations

Scopus - 27 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-004-MTX

DOI: 10.1021/ac051808a

Abstract (EN): An experimental setup to study the pH dependence of standard ion-transfer potentials at the water/NPOE interface is presented. The system is composed of a microhole generated by laser photoablation in a 12-mu m polyethylene terephthalate film, the aqueous phase consisting of a commercial immobilized pH gradient gel reswelled in electrolyte solution and a droplet of organic solution. Two electrodes are used, an Ag/AgCl aqueous electrode and an Ag/AgTPBCl organic electrode. This setup is applied to the study of two ionizable compounds (pyridine, 2,4-dinitrophenol). Thermodynamic parameters such as the standard transfer potential, the Gibbs energy of transfer, and the partition coefficients of the ionized forms as well as the neutral forms of these drug compounds are evaluated by differential pulse voltammetry. The data obtained are summarized in ionic partition diagrams, which are a useful tool for predicting and interpreting the transfer behavior of ionized drugs at the liquid/liquid interfaces mimicking the biological membranes.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6