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Photostability studies of GarKS peptides for topical formulation development
Raj Kumar Thapa1, Hanne Cecilie Winther-Larsen2, Dzung B Diep3
1Section for Pharmaceutics and Social Pharmacy, Department of Pharmacy, University of Oslo, P. O. Box 1068 Blindern, NO-0316 Oslo, Norway.
Summary
Novel antimicrobial peptides (AMPs) show enhanced photostability in combinations, particularly GakA+GakB, making them suitable for topical wound treatments. Antioxidants further improve stability and efficacy.
Area of Science:
- Biochemistry
- Materials Science
- Dermatology
Background:
- Antimicrobial peptides (AMPs) are promising alternatives to conventional antibiotics for treating chronic wound infections.
- Assessing the photostability of AMPs is crucial for developing effective topical formulations.
- Garvicin KS (GarKS), a novel peptide complex, requires photostability evaluation for potential therapeutic use.
Purpose of the Study:
- To investigate the photostability of individual and combined Garvicin KS peptides (GakA, GakB, GakC).
- To evaluate the impact of photostabilizers on peptide stability and antimicrobial efficacy after UVA irradiation.
- To determine the suitability of GarKS peptide combinations for topical antimicrobial formulations.
Main Methods:
- Photostability assessment of aqueous peptide solutions under indoor and outdoor conditions using Suntest.
- Evaluation of antimicrobial efficacy (MIC values) post-UVA irradiation.
- Investigating the effect of antioxidants (glutathione) and scavengers (trehalose) on peptide photostability.
Main Results:
- Photodegradation followed first-order kinetics under both indoor and outdoor conditions.
- Peptide combinations (GakA+GakB, GakB+GakC, GakA+GakC) demonstrated superior photostability compared to individual peptides.
- The GakA+GakB combination exhibited the highest photostability; antioxidants further enhanced stability.
- Combinations showed minimal increases in MIC values post-irradiation, indicating preserved antimicrobial activity.
Conclusions:
- The GakA+GakB and GakA+GakB+GakC peptide combinations display significant photostability and retained antimicrobial efficacy.
- These findings support the development of Garvicin KS peptide combinations as potent topical formulations for chronic wound infections.
- Photostabilizers like glutathione can further enhance the therapeutic potential of these AMP formulations.
