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Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film

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Sustained release solid lipid matrices processed by hot-melt extrusion (HME).

K Vithani¹, M Maniruzzaman, I J Slipper

¹University of Greenwich, School of Science, Chatham Maritime, Chatham, ME4 4TB Kent, UK.

Colloids and Surfaces. B, Biointerfaces

|June 14, 2013

Summary

This summary is machine-generated.

This study developed sustained release diclofenac sodium (Df-Na) lipid matrices using hot melt extrusion (HME). The resulting tablets provided 12-hour drug release, controlled primarily by diffusion.

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Area of Science:

Pharmaceutical Technology
Drug Delivery Systems

Background:

Diclofenac sodium (Df-Na) is a widely used non-steroidal anti-inflammatory drug.
Developing sustained release formulations can improve patient compliance and therapeutic efficacy.
Hot melt extrusion (HME) is a promising technique for creating solid lipid matrices for controlled drug release.

Purpose of the Study:

To develop sustained release solid lipid matrices of diclofenac sodium (Df-Na).
To investigate the impact of different hot melt extrusion (HME) processing parameters on matrix characteristics.
To evaluate the drug release profile from the developed HME lipid matrices.

Main Methods:

Solid lipid matrices of Df-Na were prepared using Compritol® 888 ATO via HME.
Various processing approaches including 'cold', 'hot', and pre-mixed formulations were employed.
Characterization included differential scanning calorimetry (DSC), hot stage microscopy (HSM), X-ray powder diffraction (XRPD), and energy dispersive X-ray (EDX) microanalysis.

Main Results:

The drug state (crystalline or amorphous) of Df-Na within the lipid matrix was dependent on processing conditions.
EDX microanalysis confirmed excellent surface distribution of Df-Na in the compressed tablets.
HME-developed lipid matrices exhibited sustained release of pre-mixed formulations for up to 12 hours.

Conclusions:

Hot melt extrusion is effective for developing sustained release diclofenac sodium solid lipid matrices.
The release mechanism from these matrices is primarily diffusion-controlled.
The processing conditions significantly influence the drug's physical state and distribution within the lipid matrix.