Journal
DRUG DEVELOPMENT AND INDUSTRIAL PHARMACY
Volume 39, Issue 3, Pages 425-436Publisher
TAYLOR & FRANCIS LTD
DOI: 10.3109/03639045.2012.662505
Keywords
Metronidazole benzoate; periodontitis; poly-epsilon-caprolactone; carbopol 934P; in situ gel; experimental design; response surface methodology
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Funding
- UGC, New Delhi, India
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The objective of the present investigation was to develop and evaluate physiological environment responsive periodontal drug delivery system (PERPDDS) for local delivery of metronidazole benzoate. Poly-epsilon-caprolactone an in situ precipitating polymer was used in combination with, carbopol 934P, a pH simulative polymer to develop PERPDDS. The prepared PERPDDS was evaluated for various parameters such as in vitro gelling capacity, viscosity, rheology, compatibility study, and in vitro diffusion study. A 3(2) full factorial design was used to investigate the influence of formulation variables. Drug release data from all formulations were fitted to different kinetic models and the korsemeyer-peppas model was found the best fit model. The value of diffusional exponent (n) was in between 0.3283 and 0.3979 indicating purely fickian diffusion release mechanism. Increasing the concentration of each polymeric component increases viscosity, and time for 50% and 90% drug release was observed and graphically represented by the surface response and contour plots.
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