title: Development and validation of an analytical method for the quantification of cytochrome c in skin transport studies.
abstract: A simple isocratic HPLC method for the quantification of Cytochrome c in skin permeation samples was developed and validated. The mobile phase comprised a 41 : 59 mixture of an organic phase A (0.1% trifluoroacetic acid in a 90 : 10 mixture of MeCN-H(2)O) and an aqueous phase B (0.1% trifluoroacetic acid in H(2)O). The Cytochrome c retention and run times were 2.62 and 8.0 min, respectively--much shorter than those for existing gradient methods. The response was accurate, precise and linear from 2.5 to 25 microg/mL. The mean recoveries for intra-day and inter-day analysis ranged from 88.5 to 103.8% and the RSD varied from 0.05 to 1.55%. The assay was used to quantify transport of Cytochrome c across intact and laser-microporated porcine skin in vitro. Cytochrome c permeation and the amount of protein retained within the membrane over 24 h were quantified as a function of the number of micropores. Although no Cytochrome c permeation was observed across intact skin, laser microporation enabled delivery of 22.9 +/- 3.3 and 56.0 +/- 15.9 microg/cm(2) of the protein across skin samples with 300 and 1800 micropores, respectively. In conclusion, the HPLC method provided a fast, efficient means to quantify Cytochrome c in samples from skin transport studies.
authors.affiliation: School of Pharmaceutical Sciences, University of Geneva and University of Lausanne, 30 Quai Ernest Ansermet, Geneva, Switzerland.
authors.forename: Yogeshwar G
authors.initials: YG
authors.lastname: Bachhav
authors.forename: Yogeshvar N
authors.initials: YN
authors.lastname: Kalia
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D045304:Cytochromes c / Q000032:analysis* / Q000378:metabolism*; D066298:In Vitro Techniques; D010539:Permeability; D012867:Skin / Q000737:chemistry* / Q000378:metabolism*; D013552:Swine
chemical_list: D045304:Cytochromes c