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Related Experiment Video

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Routine Screening Method for Microparticles in Platelet Transfusions

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Published on: January 31, 2018

Microparticle preparation by a propylene carbonate emulsification-extraction method.

Daris Grizić¹, Alf Lamprecht²

¹Department of Pharmaceutics, Institute of Pharmacy, University of Bonn, Gerhard-Domagk-Str. 3, 53121 Bonn, Germany.

International Journal of Pharmaceutics

|April 10, 2018

Summary

This summary is machine-generated.

This study introduces propylene carbonate (PC) as a safer solvent for poly(lactic-co-glycolic-acid) (PLGA) microparticle formulation. An enhanced extraction method significantly reduces residual PC, improving microparticle properties and stability.

Keywords:

Enhanced solvent extraction Microparticles PLGA Propylene carbonate

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Area of Science:

Materials Science
Polymer Chemistry
Pharmaceutical Technology

Background:

Conventional organic solvents used in microparticle formulation pose significant health and environmental risks.
Poly(lactic-co-glycolic-acid) (PLGA) microparticles are widely used in drug delivery but their preparation often involves hazardous solvents.
Developing safer and more efficient methods for microparticle production is crucial for sustainable pharmaceutical manufacturing.

Purpose of the Study:

To evaluate propylene carbonate (PC) as a low-toxicity alternative solvent for PLGA microparticle preparation.
To develop and validate an enhanced solvent extraction method for PC from PLGA microparticles.
To assess the impact of residual PC on microparticle properties, including solidification and thermal characteristics.

Main Methods:

PLGA microparticles were prepared using an emulsification-solvent extraction method with PC as the solvent.
An additional solvent extraction step utilizing hydrolytic solvent cleavage was incorporated.
Microparticle morphology, size distribution, residual solvent content, and glass transition temperature (Tg) were analyzed.

Main Results:

Spherical PLGA microparticles with a volume median diameter of 20-60 µm were successfully produced.
The enhanced PC extraction step reduced residual PC content from 8.8% to 2.7%.
This reduction in residual PC significantly improved microparticle solidification, shifting Tg from 8.2°C to 37.7°C, indicating a reduced plasticizing effect.

Conclusions:

Propylene carbonate (PC) is a viable low-toxicity solvent for PLGA microparticle formulation.
The enhanced hydrolytic solvent cleavage extraction method effectively removes residual PC without compromising PLGA stability.
This approach offers a significant advancement in developing safer and more efficient microparticle preparation techniques, replacing conventional harmful organic solvents.