Enhancement of dissolution rate of valdecoxib by solid dispersions technique with PVP K 30 & PEG 4000: preparation and in ... View Full Text


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Article Info

DATE

2009-02

AUTHORS

Jigar Shah, S. Vasanti, B. Anroop, Hiral Vyas

ABSTRACT

Solid dispersions of valdecoxib were prepared with the objective of dissolution enhancement by melt granulation technique using polyvinyl pyrollidone (PVP K 30) and polyethylene glycol (PEG 4000) alone (1:1) and in combination (1:0.5:0.5). Phase solubility studies showed a linear increase in valdecoxib solubility with increase in polymer concentration in both the cases. The FTIR spectroscopic studies showed the stability of valdecoxib and absence of well defined valdecoxib—PVP K 30–PEG 4000 interaction. Powder X-ray diffraction (XRD) and differential scanning calorimeter (DSC) were used to characterize the solid state of the dispersion, indicated a complete transformation of drug from crystalline to amorphous form. In vitro dissolution studies performed in 0.1 N HCl showed a significant enhance in dissolution rate when PEG 4000 and PVP K 30 were used in combination. Improved drug dissolution by both the carriers may be attributed to the improved wettability, reduction in drug crystallinity and solubilizing effects from solid dispersions of valdecoxib. Accelerated stability studies of solid dispersion with PVP K 30 and PEG 4000 does not show any significant change in the drug content and dissolution profile in 6 months study period. This study concluded that the dissolution rate of valdecoxib can be modulated by appropriate levels of hydrophilic carriers. More... »

PAGES

69-75

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URI

http://scigraph.springernature.com/pub.10.1007/s10847-008-9490-9

DOI

http://dx.doi.org/10.1007/s10847-008-9490-9

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