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Antifungal activity of topical microemulsion containing a thiophene derivative

Geovani Pereira Guimarães1, Mysrayn Yargo de Freitas Araújo Reis2, Dayanne Tomaz Casimiro da Silva2

  • 1Programa de Pós-Graduação em Ciências Farmacêuticas Universidade Estadual da Paraíba Campina GrandePB Brazil Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Estadual da Paraíba, Campina Grande, PB, Brazil.

Brazilian Journal of Microbiology : [Publication of the Brazilian Society for Microbiology]
|September 23, 2014
PubMed

Insights

A novel thiophene derivative (5CN05) in a microemulsion (ME) formulation shows enhanced antifungal activity, particularly against Cryptococcus neoformans. This study suggests a promising alternative therapy for fungal infections, especially in immunocompromised individuals.

Area of Science:

  • Mycology
  • Pharmaceutical Sciences
  • Drug Delivery Systems

Background:

  • Fungal infections pose a significant global health challenge, particularly for immunocompromised patients, with existing antifungal treatments facing limitations in efficacy and resistance.
  • Current antifungal therapies are limited, necessitating the development of novel agents with improved effectiveness and safety profiles.
  • Microemulsions offer a stable drug delivery system for enhancing the solubility and efficacy of lipophilic compounds.

Purpose of the Study:

  • To evaluate the antifungal activity of a thiophene derivative (5CN05) encapsulated within a microemulsion (ME) for potential topical application.
  • To compare the efficacy of the 5CN05-loaded microemulsion against Candida species and Cryptococcus neoformans with the free compound and a standard antifungal agent.
  • To explore the potential of microemulsion-based drug delivery systems for improving antifungal drug performance.

Main Methods:

  • The antifungal activity was assessed using the microdilution method to determine the minimum inhibitory concentration (MIC).
  • Physicochemical properties of the blank microemulsion (ME-blank) and the 5CN05-loaded microemulsion (ME-5CN05) were evaluated for topical suitability.
  • Amphotericin B was used as a control antifungal agent for comparative analysis.

Main Results:

  • The thiophene derivative 5CN05 demonstrated moderate to weak activity against Candida species (MIC = 270-540 μg/mL) but good activity against C. neoformans (MIC = 17 μg/mL).
  • Encapsulation in microemulsions significantly enhanced the antifungal potency of 5CN05 against Candida species (MIC = 70-140 μg/mL).
  • The ME-5CN05 formulation exhibited markedly improved activity against C. neoformans, with a MIC of 2.2 μg/mL, indicating a substantial increase in efficacy.

Conclusions:

  • The microemulsion formulation significantly potentiates the antifungal activity of the thiophene derivative 5CN05, especially against Cryptococcus neoformans.
  • The developed ME-5CN05 formulation shows promise as an effective and potentially less toxic alternative therapeutic strategy for treating C. neoformans infections.
  • This study highlights the potential of microemulsions as a viable drug delivery system for developing novel antifungal agents for pharmaceutical applications.
Keywords:
Cryptococcus neoformansantifungal susceptibilitymicroemulsionthiophene derivatives

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