Influence of admired citric acid on the release profile of pelanserin hydrochloride from HPMC matrix tablets

Citation
R. Espinoza et al., Influence of admired citric acid on the release profile of pelanserin hydrochloride from HPMC matrix tablets, INT J PHARM, 201(2), 2000, pp. 165-173
Citations number
22
Categorie Soggetti
Pharmacology & Toxicology
Journal title
INTERNATIONAL JOURNAL OF PHARMACEUTICS
ISSN journal
03785173 → ACNP
Volume
201
Issue
2
Year of publication
2000
Pages
165 - 173
Database
ISI
SICI code
0378-5173(20000525)201:2<165:IOACAO>2.0.ZU;2-1
Abstract
Pelanserin is a weakly basic experimental drug with a short half-life and a prolonged release formulation was developed using hydroxypropyl methylcell ulose (HPMC) and citric acid to set up a system bringing about gradual rele ase of this drug. For this purpose powder mixtures were wet granulated with water and compressed with a hydraulic press at 55 MPa. Dissolution studies were made using 900 mi HCl 0.1 N, the first 3 h, and phosphate buffer pH 7 .4, h 3-8. Dissolution curves were described by M-t/M-inf= kt(n), applied s eparately for each dissolution medium. The dissolution mechanism involved a coupled diffusion/relaxation with a trend favoring the diffusion mechanism with increasing citric acid concentrations. Increasing concentrations of c itric acid produced increasing values of the kinetic constants, in a cubic relationship. Higher HPMC proportions produced slower dissolution rates but with a citric acid compensating more clearly a decreased solubility of pel anserin at pH 7.4. Individually calculated dissolution curves showed experi mental 8 h pelanserin dissolution in a ran ge of 65-99% for matrices with 1 00 mg HPMC/tab., while those with 200 mg HPMC/tab. were in the range 57-73% . (C) 2000 Elsevier Science B.V. All rights reserved.