[Studies on Xipamide (4-chloro-5-sulfamoyl-2',6'-salicyloxylidide). Part 1: Physico-chemical and chemical properties (author's transl)]. / Untersuchungen mit Xipamid (4-Chlor-5-sulfamoyl-2',6'-salicyloxylidid). Teil I: Physikalisch-chemische und chemische Eigenschaften.
Arzneimittelforschung
; 27(11): 2140-3, 1977.
Article
em De
| MEDLINE
| ID: mdl-23792
ABSTRACT
The saluretic agent xipamide (4-chloro-5-sulfamoyl-2',6'-salicyloxylidide; Aquaphor) is a lipophilic substance as demonstrated by solubilities and partition coefficients. In the physiological pH-range, however, xipamide forms an anion which has an octanol-water partition coefficient of approx. 1. Two steps of ionization were investigated photometrically. The first one gives rise to a phenolate anion; pKa1 = 4.75. In the second one, ionization of the sulfamoyl group occurs; pKa2 = 10. Xipamide is stable in acidic as well as in basic media at room temperature. But when xipamide is acted upon by strong alkali and elevated temperature, 2,6-xylidine is formed by hydrolysis. For analytic use UV-photometric, colorimetric and TLC data of xipamide are given.
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01-internacional
Base de dados:
MEDLINE
Assunto principal:
Xipamida
/
Diuréticos
Idioma:
De
Revista:
Arzneimittelforschung
Ano de publicação:
1977
Tipo de documento:
Article