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Tropical Journal of Pharmaceutical Research
Pharmacotherapy Group, Faculty of Pharmacy, University of Benin, Benin City, Nigeria
ISSN: 1596-5996
EISSN: 1596-5996
Vol. 13, No. 2, 2014, pp. 205-210
Bioline Code: pr14029
Full paper language: English
Document type: Research Article
Document available free of charge

Tropical Journal of Pharmaceutical Research, Vol. 13, No. 2, 2014, pp. 205-210

 en Ispaghula Husk-Based Extended Release Tablets of Diclofenac Sodium: Formulation, Evaluation and In vitro Release Studies
Raja, D.; Poornima, D.; Bhaskar, K. & Saravanan, M.


Purpose: To formulate extended-release tablets of diclofenac sodium based on ispaghula husk
Methods: Tablets with varying proportions of diclofenac sodium and ispaghula husk were formulated by wet granulation technique at a fixed compression force of 10 kN. The formulated tablets were evaluated for physicochemical parameters as well as by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and x-ray diffraction (XRD).
Results: Content uniformity, weight variation, thickness and friability of the formulated tablets were within acceptable limits. The hardness of the tablet decreased from 5.4 to 4.2 kg/cm2 with increasing quantity of ispaghula husk in the formulation. In contrast, disintegration time increased from 12 to 70 min with increasing amount of husk. Tablets formulated with 1:0.25 and 1:0.5 drug/husk ratio failed to extend drug release whereas tablets prepared with 1:0.75 and 1:1 ratio extended release up to 5 and 6 h, respectively. FTIR, DSC and XRD analysis of tablets revealed the absence of diclofenac–ispaghula interaction and crystalline nature of diclofenac sodium. Drug release data fitted well with Korsmeyar- Peppas and the n value of 0.98 indicate non-Fickian diffusion. The tablets were stable on storage and retained its physicochemical properties within acceptable limits.
Conclusion: The results indicate the possibility of formulating extended-release tablets based on ispaghula husk. The tablets were stable during storage and free from drug-excipient interactions. However further studies are required to ascertain the safety of the husk and to optimize the release properties of the tablets.

Ispaghula husk; Extended release tablet; Diclofenac sodium; Release kinetics

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