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IN VITRO STUDIES FURTHER DETAILS

In Vitro Study No: 9

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

Benzoic Acid

0.0305

0.05

0.0238

Ethanol

Rat

Isolated Dermis

Back

0.64

flow-through

PBS

31.5

Skin

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)
								45.9	13.7			0.006	11	1.06

% Recovery

+/-

% In Stratum Corneum

+/-

% in Viable Skin

+/-

% Penetrated

+/-

% Absorbed

+/-

s-s-flux (mcrg/cm2/h)

+/-

kp (cm/h)

Lag Time (h)

45.9

13.7

0.006

1.06

NOTES

The flow rate in the cell was 1.9ml/min. The skin was taken from 4-5 wk old male Ola:Sprague Dawley rats it was soaked in 2M Sodium Bromide for 24 hours prior to the study to separate the epidermis and dermis.

REFERENCE

Absorption Of Hydrophilic And Lipophilic Compounds Through Epidermal And Subepidermal Strata Of Rat Skin in Vitro (1998) Toxicol. Vitro, 12 :47-55