In vitro percutaneous penetration of polycyclic aromatic hydrocarbons from sunscreen creams

Introduction
Dermal exposure to Polycyclic Aromatic Hydrocarbons (PAHs) affects many outdoor workers such as asphalt workers. Usually the use of sunscreen creams is suggested to protect them from UV radiation. However sunscreen could prevent or facilitate dermal absorption of industrial chemicals. The aim of the study was to assess percutaneous penetration of anthracene using 2 different sunscreen creams as vehicle.

Methods
In vitro permeation experiments were carried out using standardized in vitro methods with static diffusion cells. Excised human skin prepared to approximately 350 micrometers thickness was fixed on the diffusion cells. The receiving phase was a saline solution with 6% PEG 20. The 2 sunscreen creams (one lipophilic and one idrophilic) were applied uniformly (2mg/cm2) on the skin mounted on the diffusion cell. After 20 minutes a solution of anthracene and artificial sweat was added. Analysis of anthracene in the receptor samples was carried out by beta counter analyzer (Packard).

Results
Results did not show a percutaneous penetration of anthracene from sunscreen creams while in previous studies in vitro percutaneous penetration of anthracene was demonstrated using the same methodology.

Discussion
The use of sunscreen creams among outdoor workers, would not seem to enhance percutaneous penetration of PAHs. On the contrary it would be able to reduce dermal absorption of anthracene in the workplace.