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Journal of Pharmaceutics
Volume 2016, Article ID 3240290, 9 pages
Research Article

Functional Performance of Chitosan/Carbopol 974P NF Matrices in Captopril Tablets

Departamento de Farmacia, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional de México, Ciudad de México, Mexico

Received 19 July 2016; Revised 19 September 2016; Accepted 5 October 2016

Academic Editor: Anthony A. Attama

Copyright © 2016 Yuritze Alejandra Aguilar-López and Leopoldo Villafuerte-Robles. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Chitosan and Carbopol have been used to form a complex through an electrostatic interaction between the protonated amine (NH3+) group of chitosan and the carboxylate (COO) group of Carbopol. In situ polyelectrolyte complexes formations based on the physical mixture of chitosan and sodium alginate were found and could be used as an oral controlled release matrix. The aim of this work is the assessment of a possible interaction between the particles of chitosan and Carbopol 974P NF that could modify their technological performance in captopril tablets. The drug and excipients were evaluated as mixtures of powders and tablets. The mixtures with captopril contained Carbopol 974P NF, chitosan, or a 1 : 1 mixture thereof with polymer proportions of 10%, 20%, and 30%. The evaluated parameters were the powder flow rate, the powder compressibility index, and the compactibility and release behavior of the tablets. The observed technological behavior points out to a greater interaction between the particles of polymers with different charge than between particles of the individual polymers. This produces more coherent matrices restricting more efficiently the drug dissolution, more coherent tablets with higher compactibility, and less flowing powder mixtures. All this, however, requires additional investigation to confirm the current results.