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Dipeptides as co-formers in co-amorphous systems.

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Dipeptides effectively form co-amorphous systems with the drug mebendazole, significantly enhancing its dissolution rate and physical stability. These drug-dipeptide systems show promise for improving poorly water-soluble medications.

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Area of Science:

  • Pharmaceutical Sciences
  • Materials Science
  • Drug Delivery

Background:

  • Drug-amino acid co-amorphous systems are researched to enhance the dissolution rates of poorly water-soluble drugs.
  • Dipeptides, composed of two amino acids, offer a hypothesis for combining inherent properties to improve drug formulation.

Purpose of the Study:

  • To investigate dipeptides as co-formers for creating co-amorphous systems with the model drug mebendazole.
  • To evaluate the influence of dipeptide side chains and amino acid sequence on co-former performance.
  • To assess the impact of co-amorphization on drug dissolution rate and physical stability.

Main Methods:

  • Co-amorphization of mebendazole with five selected dipeptides (tryptophan-phenylalanine, phenylalanine-tryptophan, aspartic acid-tyrosine, histidine-glycine, proline-tryptophan) using ball milling.
  • Characterization of amorphous systems formed.
  • Dissolution studies to compare drug release from co-amorphous systems versus crystalline/amorphous mebendazole.
  • Physical stability assessments of the co-amorphous systems.

Main Results:

  • All mebendazole-dipeptide systems achieved amorphous states after 30 minutes of ball milling, unlike single amino acids or physical mixtures.
  • Significant increases in mebendazole dissolution rates were observed from most co-amorphous systems compared to crystalline and amorphous forms.
  • Co-amorphous mebendazole-dipeptide systems exhibited enhanced physical stability compared to amorphous mebendazole.
  • No clear trend in drug dissolution enhancement was identified across the different dipeptide co-formers.

Conclusions:

  • Dipeptides are effective co-formers for developing co-amorphous drug systems.
  • Co-amorphization with dipeptides improves both the dissolution rate and physical stability of mebendazole.
  • Dipeptides represent a promising strategy for formulating poorly water-soluble drugs.