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Matrices containing NaCMC and HPMC 1. Dissolution performance characterization.

S Conti1, L Maggi, L Segale

  • 1Department of Pharmaceutical Chemistry, Via Taramelli, 12, I-27100 Pavia, Italy. stefania.conti@unipv.it

International Journal of Pharmaceutics
|January 9, 2007
PubMed
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This study shows that mixing hydroxypropylmethylcellulose (HPMC) and sodium carboxymethylcellulose (NaCMC) improves controlled drug release from matrix tablets. The polymer blend offers better control over drug release rate and mechanism at specific pH levels.

Area of Science:

  • Pharmaceutical Technology
  • Polymer Science
  • Drug Delivery Systems

Background:

  • Controlled drug release is crucial for therapeutic efficacy.
  • Hydrophilic polymers like HPMC and NaCMC are widely used in matrix tablet formulations.
  • Understanding polymer-drug interactions and release mechanisms is essential for optimizing drug delivery.

Purpose of the Study:

  • To investigate the controlled release performance of matrix tablets using hydroxypropylmethylcellulose (HPMC) and sodium carboxymethylcellulose (NaCMC).
  • To evaluate the effect of polymer composition (individual polymers vs. mixture) and dissolution medium pH on drug release profiles.
  • To elucidate the relationship between gel properties (texture analysis) and drug release kinetics/mechanisms.

Main Methods:

  • Formulation of matrix tablets containing a soluble drug with HPMC, NaCMC, or a mixture of both.

Related Experiment Videos

  • In vitro drug release studies conducted at different pH values (1, 4.5, 6.8).
  • Texture analysis of swollen tablets to characterize gel properties and correlate with release mechanisms.

    • Main Results:

    • The mixture of HPMC and NaCMC demonstrated superior control over drug release rate and mechanism at pH 4.5 and 6.8 compared to individual polymers.
    • Texture analysis revealed that stronger, more consistent gels (from the polymer mixture) exhibited slower erosion and diffusion-controlled drug release.
    • Weaker gels (from individual polymers) showed increased susceptibility to erosion and polymer relaxation, leading to a different release mechanism.

    Conclusions:

    • A blend of HPMC and NaCMC offers enhanced control over drug release from matrix tablets, particularly at neutral and slightly acidic pH.
    • Gel strength and consistency, assessed by texture analysis, are critical factors influencing drug release mechanisms (diffusion vs. erosion/relaxation).
    • This study provides valuable insights for designing effective matrix tablet formulations with tailored drug release profiles.