Determination of cidofovir in both skin layers and percutaneous penetration samples by HPLC

The aim of this study was to develop a direct, simple and rapid high performance liquid chromatographic method for the determination of cidofovir in both skin layers and percutaneous penetration experiments. Samples were chromatographed on a reversed phase encapped column 250×4 mm C 8 LiChrospher Select B. The phase mobile consisted on 3% of acetonitrile and 97% of 1.5 mM of tetrabutylammonium dihydrogen phosphate (TADP) and 3.5 mM of disodium hydrogenphosphate adjusted to pH 6. Detection was at 274 nm and the run time was 14 min. The limit of detection was 0.06 μg/ml. The detector response was found to be linear in the concentration range 0.1–10 μg/ml. This assay is a selective, sensitive and reproducible method for the quantification of cidofovir in skin layers and in the receptor compartment of Franz-type diffusion cells after percutaneous studies.