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Validation of USP apparatus 4 method for microsphere in vitro release testing using Risperdal Consta.

Archana Rawat¹, Erika Stippler, Vinod P Shah

¹School of Pharmacy, University of Connecticut, 69 North Eagleville Rd, Unit 3092, Storrs, CT 06269, USA. archana.rawat@uconn.edu

International Journal of Pharmaceutics

|September 6, 2011

Summary

A new in vitro release testing method for parenteral microspheres was validated using USP apparatus 4. This accelerated method correlates well with real-time testing and is suitable for compendial adaptation.

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Area of Science:

Pharmaceutical Sciences
Drug Delivery Systems
Analytical Chemistry

Background:

Controlled release parenteral microspheres require validated in vitro release testing methods.
Current methods may lack efficiency or compendial adaptability.
Standardized testing is crucial for quality control and regulatory approval.

Purpose of the Study:

To validate an in vitro release testing method for controlled release parenteral microspheres.
To adapt a USP apparatus 4 method for potential compendial use.
To assess the correlation between accelerated and real-time release profiles.

Main Methods:

Validation of a USP apparatus 4 method using commercial microspheres (Risperdal Consta).
Conducting accelerated and real-time in vitro release tests.
Performing robustness and reproducibility testing under varied conditions.

Main Results:

The accelerated method significantly reduced test duration with good correlation to real-time profiles.
Method robustness was confirmed; release was not flow rate dependent and unaffected by minor variations.
Temperature (± 0.5°C) significantly impacted risperidone-catalyzed PLGA degradation and release.
The accelerated method demonstrated reproducibility across different systems and analysts.

Conclusions:

The modified USP apparatus 4 method is suitable for in vitro release testing of microspheres.
The validated accelerated method offers a time-efficient alternative for quality control.
This work supports the potential compendial adaptation of the method for microsphere drug release testing.