In vitro human skin permeability coefficient data collected by Flynn (1990) have been analysed using multiple regression analysis. An improved model for the prediction of permeability coefficients has been derived by the inclusion of the melting point as an independent variable in addition to the octanol-water partition coefficient (as logP) and molecular volume. (The solubility […]
As the quest to develop useful in vitro test methodologies to replace rabbit eye and skin irritation tests continues, validation projects still depend on historical rabbit eye and skin irritation data as the benchmark against which to measure the performance of the in vitro assays. During our daily contact with sponsors, we are asked more […]
The neutral red cytotoxicity assay was used in vitro to evaluate the potencies of phenylpropanolamine (PPA), nicotine, caffeine, some of their metabolites, and related chemicals. The human cell types used as targets included fibroblast (HFF), melanoma (SK-Mel/27), and hepatoma (HepG2) cell lines and early passage endothelial (ENDO) cells and keratinocytes (NHEK). For all of these […]
Skin barrier disruption caused by organic solvents to human cadaver dermatomed skin was evaluated using an in vitro model system. Resultant changes in transepidermal water loss (TEWL), as measured with an evaporimeter, were recorded after topical application of either acetone, chloroform:methanol 2:1, hexane, hexane:methanol 2:3, or the control, water, for exposure times of 1, 3, […]
