In vitro human skin penetration model for organophosphorus compounds with different physicochemical properties
1Swedish Defence Research Agency, Division of CBRN Defence and Security, Umeå, Sweden.
Summary
This study validated a flow-through diffusion cell for organophosphorus compounds (OPCs) penetration. Hydrophilicity and lipophilicity significantly influence OPC skin penetration rates, with optimal concentrations varying by compound type.
Area of Science:
- Toxicology
- Dermal Penetration Studies
Background:
- Organophosphorus compounds (OPCs) pose significant toxicological risks.
- Understanding dermal penetration is crucial for risk assessment and safety protocols.
Purpose of the Study:
- To validate a flow-through diffusion cell for in vitro human epidermal penetration studies of OPCs.
- To investigate the influence of physicochemical properties and application conditions on OPC dermal penetration.
Main Methods:
- Utilized a validated flow-through diffusion cell for in vitro human epidermal penetration studies.
- Applied organophosphorus compounds (OPCs) using infinite dosing.
- Varied agent concentration, physicochemical properties (hydrophilicity/lipophilicity), and receptor solution composition (ethanol/water ratios).
Main Results:
- Hydrophilic and lipophilic properties were major determinants of OPC penetration rate.
- Maximum penetration for lipophilic OPCs occurred at 20-75% concentration; for hydrophilic OPCs, at 10-20%.
- Low penetration was observed at 1% concentration or when neat agents were applied. Receptor solution ethanol concentration significantly impacted diluted OPC penetration.
Conclusions:
- The flow-through diffusion cell is effective for studying OPC epidermal penetration.
- OPC penetration rates are significantly influenced by dilution and receptor fluid composition.
- Physicochemical properties critically affect dermal absorption of organophosphorus compounds.
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