Dissolution enhancement of atorvastatin calcium by co-grinding technique
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Abstract
Atorvastatin calcium (AC) is a BCS class II drug which shows poor bioavailability due to inadequate dissolution. Solid dispersions present a promising option to enhance the solubility of poorly soluble drugs. Co-grinding with hydrophilic excipients is an easy and economical technique to improve the solubility of poorly soluble drugs and is free from usage of organic solvents. The aim of the present study was to explore novel carrier VBP-1 (organosulphur compound) for formulating a solid dispersion by using a simple, commercially viable co-grinding technique to enhance the dissolution of AC and to develop an oral formulation of the same. Composition of the solid dispersion was optimized based on the release profile in pH 1.2 buffer. The optimized solid dispersion was further characterized for flow properties, DSC, FTIR spectroscopy, XRD, contact angle, SEM studies and release profile in phosphate buffer pH 6.8. The developed solid dispersion gave similar release profile as the innovator formulation (Lipitor® tablets) in both pH 1.2 buffer and phosphate buffer pH 6.8. The developed solid dispersion was formulated into hard gelatin capsules (size 3). The developed capsules were found to give similar release as the innovator formulation in both pH 1.2 buffer and phosphate buffer pH 6.8. The developed capsules were found to be stable for a period of 6 months. Anti-hyperlipidemic efficacy studies in rats showed higher reduction in cholesterol and triglyceride levels by the developed capsules in comparison to pure AC. In conclusion, novel carrier VBP-1 was successfully employed to enhance the dissolution of AC using co-grinding technique.
Keywords
Atorvastatin calcium Co-grinding Solid dispersion Solubility Wettability DissolutionNotes
Acknowledgments
The authors are thankful to University Grants Commission for Junior Research Fellowship. The authors also wish to thank Cadila Pharmaceuticals, Ahmedabad for the gift sample of AC; BASF, Mumbai for excipients and Haffkine Institute, Mumbai for providing the animals. The authors also thank Dr. Dalapathi Gugulothu, Dr. Harshad Shete, Dr. Soniya Jain, Jayesh Dhodi, Dr. S.S. Sathaye and Prof. A.R. Juvekar for their guidance in animal studies and Rubicon Research Private Limited, Mumbai for packaging of formulations.
Compliance with ethical standards
All institutional and national guidelines for the care and use of laboratory animals were followed.
Conflict of interest
The authors declare that they do not have any competing interests.
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