IN VITRO STUDIES FURTHER DETAILS
In Vitro Study No: 837
METHODS
Chemical
Conc. (mg/ml)
Volume (ml)
Loading (mg/cm2)
Vehicle
Species
Membrane
Site
Area (cm2)
Cell Type
Receptor Fluid
Temp. (oC)
Temp. Measured
Exposure Time (h)
Study Length (h)
Occluded
Analytical Method
Cypermethrin
28.4
0.0005
0.00559
oil based spray
Rat
Isolated Epidermis
Dorso-lumbar region
2.54
Static
20% fetal calf serum in saline
Not Given
8
8
2
Radiolabelled (14C)
RESULTS
% Recovery
+/-
% In Stratum Corneum
+/-
% in Viable Skin
+/-
% Penetrated
+/-
% Absorbed
+/-
s-s-flux (mcrg/cm2/h)
+/-
kp (cm/h)
n
Lag Time (h)
2.6
1
4
NOTES
Alpk/AP strain Wistar derived rats were used. Rat epidermal membranes were prepared by soaking in 2M NaBr solution before gently peeling away the epidermis. Results were given +/- SEM. I have converted this to SD for the purpose of this database.
REFERENCE
Comparison Of The In Vivo And In Vitro Percutaneous Absorption Of A Lipophilic Molecule (Cypermethrin, a Pyrethroid Insecticide) (1987) J. Investig. Dermatol., 89 :142-146