A simple mathematical model of skin diffusion of nerve agent VX in vitro

Autor: Christopher H. Dalton, Stuart Graham, John Jenner
Rok vydání: 2021
Předmět:
Zdroj: Computational Toxicology. 17:100137
ISSN: 2468-1113
DOI: 10.1016/j.comtox.2020.100137
Popis: A simple compartmental mathematical model has been used to describe the penetration of VX, a relatively non-volatile, persistent organophosphorus nerve agent, through pig and guinea pig skin in vitro. Rate constants were derived by fitting the mathematical model to the experimentally measured accumulation of agent in the receptor fluid of Franz type diffusion cells over 24 h following application of a small drop (10 µL) to the surface of the skin and left uncovered. The predictive capability of the model was tested by using these rate constants to predict diffusion when the cells were covered to restrict evaporation and when the agent was applied diluted in a solvent. For guinea pig skin, rate constants derived from the uncovered condition produced reasonable predictions of diffusion in occluded diffusion cells and when small amounts of VX were applied in a volatile solvent. The slightly under-predicted VX absorption under occlusion was consistent with the effects of hydration of the skin. Differences between predicted and experimental values were larger for diffusion through pig skin, possibly due to the lower absorption rates in this species. The model is recommended for use as a relatively simple method of analysis of in vitro diffusion cell data that enhances understanding of the results and eliminates the need to assume abstract mathematical relationships between time and amount absorbed. Assumptions made in the modelling have highlighted areas where further research is required.
Databáze: OpenAIRE
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