Tropical Journal of Pharmaceutical Research
Pharmacotherapy Group, Faculty of Pharmacy, University of Benin, Benin City, Nigeria
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
© Copyright 2014 - Tropical Journal of Pharmaceutical Research
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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