Tropical Journal of Pharmaceutical Research | ||||||||||||||
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Development and in-vitro Evaluation of a Topical Drug Delivery System Containing Betamethazone Loaded Ethyl Cellulose Nanospheres Kumaraswamy
Santhi, Dhandapani Nagasamy Venkatesh*, Sokkalingam Arumugam Dhanaraj,
Shanmugasundaram Sangeetha and Bhojraj Suresh Dept of Pharmaceutics, J S S College of pharmacy, Ooty - 643 001. Tamil Nadu, India.
Tropical Journal of Pharmaceutical Research 2005; 4(2): 495-500 ISSN: 1596-5996
Abstract Purpose:
Lipid nanospheres are used for the passive targeting of cosmetic agents to skin,
thereby achieving major benefits such as reduction of total dose and avoidance
of systemic absorption. The present
study was carried out to exploit the feasibility of using polymeric nanospheres
as an alternative and cheaper carrier for targeting corticosteroids to the skin. Methods:
Nanospheres were prepared from ethyl cellulose by a modified method of
desolvation and cross linking. The
drug betamethazone was incorporated into nanospheres and the drug: polymer ratio
was evaluated to determine the carrier capacity of the polymer. In vitro release
studies of drug-loaded nanospheres were carried out by the centrifugal
ultrafiltration method. The
kinetics of release was determined and fitted to an empirical equation. The release of drug from drug-loaded nanospheres dispersing
in a conventional cream was evaluated. A
comparative in vitro diffusion study was carried out between a commercial brand
of cream and the cream incorporating nanospheres. Results:
Formulation of nanospheres of betamethazone by a modified method produced
discrete particles. Studies on drug:polymer ratio showed a linear relationship
between drug concentration and percentage of loading. The in vitro release of
drug-loaded nanospheres was found to be first order. The comparative in vitro diffusion study between the
commercial cream and the formulated cream showed a marked reduction in release
rate from nanospheres-bound cream. Conclusion:
Formulated topical cream containing nanospheres of betamethazone was found to be
a potential dermal delivery system for sustaining the release of the drug. To whom correspondence should be addressed: Tel: 91-423-2443393. Fax: 91-423-2442937.Email: dnvooty@sify.com
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Last updated: August 30, 2006 |