Preparation, in Vitro and in Vivo Evaluation of Liposomal/Niosomal Gel Delivery Systems for Clotrimazole

Peking Union Medical College Hospital, Peping, Beijing, China
Drug Development and Industrial Pharmacy (Impact Factor: 2.1). 06/2005; 31(4-5):375-83. DOI: 10.1081/DDC-54315
Source: PubMed


Clotrimazole, which is an imidazole derivative antifungal agent, was widely used for the treatment of mycotic infections of the genitourinary tract. To develop alternative formulation for the vaginal administration of clotrimazole to provide sustained and controlled release of appropriate drug for local vaginal therapy, liposomes/niosomes were evaluated as delivery vehicles. To optimize the preparation of liposomes/niosomes with regard to size and entrapment efficiency, multilamellar liposomes/niosomes containing drug were prepared by lipid hydration method. The prepared liposomes/niosomes were incorporated into 2% carbopol gel, and the systems were evaluated for drug stability in phosphate-buffered saline (pH 7.4) and simulated vaginal fluid at 37 +/- 1 degrees C. Further, the vesicle gel system was evaluated by antifungal activity and tolerability on tissue level in rat.

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    • "Similar results have previously been reported for some lipophilic drugs as triamcinolone acetonide (36), clotrimazole (37), ciprofloxacin (38), dexamethasone (39), ibuprofen and diazepam (40). Cholesterol molecules are placed between the adjacent phospholipid molecules in liposomal bilayer and hence occupy some space and compete with α-tocopherol for incorporation into the bilayer. "
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    • "[informa internal users] At: 15:34 7 May 2009 (also shown in Figure 4) compared with the niosome gel, but the extent of release at 12 h was comparable. Incorporation of the niosomes into a structured gel vehicle resulted in a slower initial phase compared with niosome dispersion possibly because of the diffusion restriction imposed by the polymeric network of the gel (Glavas-Dodov, Fredro- Kumbaradzi, Goracinova, Calis, & Hincal, 2003; Ning et al., 2005; Turker, Erdogan, Ozer, Ergun, & Tuncel, 2005). "
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    ABSTRACT: Marketed topical gels of the antifungal drug naftifine hydrochloride contain 50% alcohol as cosolvent. Repeated exposure to alcohol could be detrimental to skin. The aim of this study is to develop an alcohol-free niosome gel containing 1% naftifine hydrochloride. Niosomes were prepared and formulation variables were optimized to achieve maximum entrapment coupled with stability. Maximum drug entrapment and niosome stability entailed imparting a negative charge to the vesicles where entrapment efficiency reached 50%. Niosomes were incorporated into a hydroxyethylcellulose gel. The final gel contained a total drug concentration of 1% (wt/wt) half of which was entrapped in the niosomes. The results suggest the potential usefulness of the niosome gel.
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