Optimization of Carboxymethyl-Xyloglucan-Based Tramadol Matrix Tablets Using Simplex Centroid Mixture Design

Area of Science:

• Pharmaceutical Sciences
• Drug Delivery Systems
• Polymer Science

Background:

• Oral drug delivery systems require controlled release mechanisms to improve therapeutic efficacy and patient compliance.
• Hydrophilic polymers are commonly used in sustained-release formulations, but can exhibit burst release.
• Carboxymethyl xyloglucan is a natural hydrophilic polymer with potential for drug release modification.

Purpose of the Study:

• To evaluate the release-modifying effect of carboxymethyl xyloglucan in oral sustained-release tramadol HCl tablets.
• To optimize the drug release profile using a simplex centroid design.
• To investigate the impact of carboxymethyl xyloglucan and HPMC K100M on drug release kinetics.

Main Methods:

• Sustained-release matrix tablets of tramadol HCl were prepared using wet granulation.
• Carboxymethyl xyloglucan (X1) and HPMC K100M (X2) were used as matrix-forming polymers, with dicalcium phosphate (X3) as a filler.
• A simplex centroid design optimized formulations based on drug release at 2 and 8 hours (Y1, Y2).

Main Results:

• Formulated tablets exhibited anomalous release mechanisms and followed matrix drug release kinetics.
• Regulated and complete drug release was achieved within 8 to 10 hours.
• Both carboxymethyl xyloglucan and HPMC K100M significantly affected drug release (P > 0.05).

Conclusions:

• Carboxymethyl xyloglucan is a viable polymer for developing sustained-release oral drug delivery systems.
• The developed mathematical models accurately predicted and optimized drug release profiles.
• The study validates the use of carboxymethyl xyloglucan and HPMC K100M for controlled tramadol HCl release.