title: Development and evaluation of new microemulsion-based hydrogel formulations for topical delivery of fluconazole.
abstract: The aim of the present investigation was to develop and evaluate microemulsion-loaded hydrogels (MEHs) for the topical delivery of fluconazole (FZ). The solubility of FZ in oils, surfactants and cosurfactants was evaluated to identify the components of the microemulsion. The pseudo-ternary phase diagrams were constructed using the novel phase diagram by micro-plate dilution method. Carbopol EDT 2020 was used to convert FZ-loaded microemulsions into gel form without affecting their structure. The selected microemulsions were assessed for globule size, zeta potential and polidispersity index. Besides this, the microemulsion-loaded hydrogel (MEH) formulations were evaluated for drug content, pH, rheological properties and in vitro drug release through synthetic membrane and excised pig ear skin in comparison with a conventional hydrogel. The optimised MEH FZ formulations consisting of FZ 2%, Transcutol P 11.5% and 11%, respectively, as oil phase, Lansurf SML 20-propyleneglycol 52% and 50%, respectively, as surfactant-cosurfactant (2:1), Carbopol EDT 2020 1.5% as gelling agent and water 34.5% and 37%, respectively, showed highest flux values and high release rate values, and furthermore, they had low surfactant content. The in vitro FZ permeation through synthetic membrane and excised pig ear skin from the studied MEHs was best described by the zero-order and first-order models. Finally, the optimised MEH FZ formulations showed similar or slightly higher antifungal activity as compared to that of conventional hydrogel and Nizoral® cream, respectively. The results suggest the potential use of developed MEHs as vehicles for topical delivery of FZ, encouraging further in vitro and in vivo evaluation.
authors.affiliation: Department of Pharmaceutical Technology, Faculty of Pharmacy, "Victor Babeş" University of Medicine and Pharmacy, Eftimie Murgu Square 1, 300041, Timişoara, Romania.
authors.forename: Georgeta
authors.initials: G
authors.lastname: Coneac
authors.forename: Vicenţiu
authors.initials: V
authors.lastname: Vlaia
authors.forename: Ioana
authors.initials: I
authors.lastname: Olariu
authors.forename: Ana Maria
authors.initials: AM
authors.lastname: Muţ
authors.forename: Dan Florin
authors.initials: DF
authors.lastname: Anghel
authors.forename: Cornelia
authors.initials: C
authors.lastname: Ilie
authors.forename: Călin
authors.initials: C
authors.lastname: Popoiu
authors.forename: Dumitru
authors.initials: D
authors.lastname: Lupuleasa
authors.forename: Lavinia
authors.initials: L
authors.lastname: Vlaia
mesh_terms: D000287:Administration, Topical; D000818:Animals; D000935:Antifungal Agents / Q000008:administration & dosage*; D004655:Emulsions; D015725:Fluconazole / Q000008:administration & dosage*; D020100:Hydrogels; D066298:In Vitro Techniques; D013552:Swine
chemical_list: D000935:Antifungal Agents; D004655:Emulsions; D020100:Hydrogels; D015725:Fluconazole