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Development of an in vitro dissolution method using microdialysis sampling technique for implantable drug delivery
A K Dash1, P W Haney, M J Garavalia
1Department of Pharmaceutical and Administrative Sciences, School of Pharmacy and Allied Health Professions, Creighton University, Omaha, Nebraska 68178, USA. adash@creighton.edu
Journal of Pharmaceutical Sciences
|October 9, 1999
Summary
Monitoring drug concentration from implantable drug delivery systems is challenging. This study introduces a microdialysis method as a novel in vitro dissolution technique for these systems.
Area of Science:
- Pharmacology
- Biomaterials Science
- Analytical Chemistry
Background:
- Accurate monitoring of drug concentration at the site of action is crucial for implantable drug delivery systems.
- Current methods for assessing drug release involve animal sacrifice or analyzing residual drug in implants, lacking in vitro dissolution options.
- Developing an effective in vitro dissolution method is essential for characterizing drug release from these advanced delivery systems.
Purpose of the Study:
- To develop a simple microdialysis sampling technique as an in vitro dissolution method for implantable drug delivery systems.
- To establish a validated HPLC method for quantifying ciprofloxacin.
- To evaluate the release characteristics of ciprofloxacin from poly(lactic acid) (PLA) and poly(lactic-glycolic acid) (PLGA) implants.
Main Methods:
- Preparation of ciprofloxacin implants by compressing microcapsules in PLA and PLGA.
- Development and validation of a sensitive High-Performance Liquid Chromatography (HPLC) method for ciprofloxacin assay.
- Application of a microdialysis sampling technique with a small release medium volume for in vitro drug release studies.
Main Results:
- A sensitive and validated HPLC method was successfully developed for ciprofloxacin quantification.
- An in vitro dissolution method utilizing microdialysis was established for implantable drug delivery systems.
- The study discusses the advantages and disadvantages of the developed microdialysis method compared to traditional USP methods.
Conclusions:
- The microdialysis sampling technique offers a viable and simple in vitro dissolution method for implantable drug delivery systems.
- This method facilitates the study of drug release characteristics, overcoming limitations of existing techniques.
- Further investigation into the advantages and disadvantages can optimize its application in drug delivery research.