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Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles
Published on: August 28, 2015
Formulation and Characterization of Carbopol-Based Porphyrin Gels for Targeted Dermato-Oncological Therapy:
Emma Adriana Ozon1, Mihai Anastasescu2, Adina Magdalena Musuc2
1Faculty of Pharmacy, "Carol Davila" University of Medicine and Pharmacy, 6 Traian Vuia St., 020956 Bucharest, Romania.
Abstract:
Malignant skin conditions are classified as the most common forms of cancer, with an evolution of one million new cases reported every year. Research efforts in the medical field are focused on developing innovative strategies for the dissemination of measures for preventing cancer and providing new antitumor compounds. The present research examines the development and evaluation of 1% Carbopol-based hydrogels incorporating two porphyrin derivatives-5,10,15,20-tetrakis-(4-acetoxy-3-methoxyphenyl) porphyrin (P2.1) and 5-(4-hydroxy-3-methoxyphenyl)-10,15,20-tris-(4-acetoxy-3-methoxyphenyl) porphyrin (P2.2)-to create formulations suitable for topical photodynamic therapy (PDT) applications. The physicochemical properties of the obtained hydrogels were carefully evaluated, revealing the successful integration of the porphyrins into the 1% Carbopol hydrogel matrix. Rheological analysis demonstrated pseudoplastic behavior, with an increase in viscosity properties for P2.1 and P2.2, suggesting interactions with the Carbopol polymer structure. UV-visible and fluorescence spectroscopy confirmed the maintenance of the porphyrins' photodynamic properties, essential for therapeutic efficacy. Pharmacotechnical studies highlighted the hydrogels' suitability for topical applications. The formulations maintained an optimal pH range, ensuring skin compatibility and minimizing the potential for skin irritation. Their mechanical properties, including elasticity and rigidity, provided stability during handling and application. The high swelling capacity indicated effective moisture retention, enhancing skin hydration and drug release potential. Furthermore, the hydrogels demonstrated excellent spreadability, enabling uniform application and coverage, crucial for efficient light activation of the photosensitizers. The combination of robust physicochemical and pharmacotechnical properties highlights the potential of these porphyrin-loaded 1% Carbopol hydrogels as promising carriers for topical PDT. These results permit further biological and therapeutic investigations to optimize the formulation for clinical use, advancing the development of effective localized photodynamic therapies.
Insights
New hydrogels loaded with porphyrin derivatives show promise for topical photodynamic therapy (PDT) in treating skin cancer. These formulations offer enhanced skin compatibility and drug delivery for effective localized treatment.
Area of Science:
- Pharmaceutical Sciences
- Dermatology
- Materials Science
Background:
- Malignant skin conditions represent a significant global health burden, necessitating innovative therapeutic strategies.
- Photodynamic therapy (PDT) is an effective localized cancer treatment modality that utilizes photosensitizers activated by light.
- Developing suitable drug delivery systems is crucial for enhancing the efficacy and applicability of PDT.
Purpose of the Study:
- To develop and evaluate 1% Carbopol-based hydrogels incorporating two novel porphyrin derivatives (P2.1 and P2.2) for topical PDT.
- To assess the physicochemical and pharmacotechnical properties of the developed hydrogel formulations.
- To determine the suitability of these hydrogels as carriers for topical photodynamic therapy of skin conditions.
Main Methods:
- Synthesis and characterization of porphyrin derivatives P2.1 and P2.2.
- Formulation of 1% Carbopol-based hydrogels incorporating P2.1 and P2.2.
- Evaluation of physicochemical properties: rheology, UV-visible and fluorescence spectroscopy, pH, mechanical properties, swelling capacity, and spreadability.
- Assessment of pharmacotechnical suitability for topical application.
Main Results:
- Successful incorporation of porphyrins into the Carbopol hydrogel matrix was confirmed.
- Rheological analysis indicated pseudoplastic behavior and increased viscosity due to porphyrin-polymer interactions.
- Spectroscopic studies verified the retention of porphyrins' photodynamic properties.
- Pharmacotechnical evaluations demonstrated optimal pH, stability, high swelling capacity, and excellent spreadability for topical application.
Conclusions:
- The developed porphyrin-loaded Carbopol hydrogels possess favorable physicochemical and pharmacotechnical properties for topical PDT.
- These hydrogels show significant potential as effective carriers for localized photodynamic treatment of skin cancers.
- Further biological and therapeutic investigations are warranted to optimize these formulations for clinical use.
