Design and statistical optimization of glipizide loaded lipospheres using response surface methodology
Hagalavadi Nanjappa Shivakumar1, Pragnesh Bharat Patel, Bapusaheb Gangadhar Desai
1Department of Pharmaceutical, K.L.E.S's College of Pharmacy, Bangalore-560010, India. shivakumarhn@yahoo.co.in
Acta Pharmaceutica (Zagreb, Croatia)
|September 20, 2007
Summary
Glipizide lipospheres were developed using paraffin wax and stearic acid for sustained drug release. Optimized formulations demonstrated effective anti-diabetic activity in rats, showing promise for diabetes management.
Area of Science:
- Pharmaceutical Technology
- Drug Delivery Systems
- Materials Science
Background:
- Diabetes mellitus remains a significant global health challenge requiring effective therapeutic strategies.
- Glipizide is a widely used oral hypoglycemic agent, but its short half-life necessitates frequent dosing.
- Liposphere drug delivery systems offer potential for sustained release and improved patient compliance.
Purpose of the Study:
- To develop and optimize glipizide-loaded lipospheres for sustained drug release.
- To investigate the impact of formulation variables on liposphere characteristics and drug release kinetics.
- To evaluate the anti-diabetic efficacy of the optimized glipizide liposphere formulation in an animal model.
Main Methods:
- A 3^2 factorial design was utilized to produce glipizide lipospheres via emulsification phase separation.
- Paraffin wax and stearic acid were employed as retardants, with their levels and proportions as independent variables.
- Multiple linear regression analysis (MLRA) and analysis of variance (ANOVA) were used to model and analyze response parameters including particle size, encapsulation efficiency, and drug release.
Main Results:
- Both paraffin wax levels and stearic acid proportion significantly influenced liposphere characteristics and drug release (p < 0.05).
- Mathematical models were generated to predict and optimize formulation parameters.
- The optimized formulation exhibited a geometric mean diameter of 57.54 ± 1.38 µm, 86.28 ± 1.32% encapsulation efficiency, and sustained release profiles.
Conclusions:
- The study successfully developed optimized glipizide lipospheres with controlled release properties.
- Drug release kinetics followed first-order kinetics and adhered to the Higuchi diffusion model.
- The optimized liposphere formulation demonstrated sustained anti-diabetic activity in rats, indicating its therapeutic potential.
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