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IN VIVO STUDIES FURTHER DETAILS


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In Vivo Study No: 713

METHODS

ChemicalMembraneConcentration mg/mlConcentration mg/mlloading (mg/cm2)SpeciesSiteArea (cm2)Occluded?Exposure Time (h)Analytical Method
Nicotinic Acid0.026.15550.12311ethyleneglycol:triton X-100 (90:10)RatBack124Radilabelled (14C)

RESULTS

Length of Study (h)% Recovery+/-Dose remaining on surface (mg)% remaining on SurfaceDose remaining in stratum corneum (mg)% remaining in stratum corneumDose remaining in the viable skin% remaining in the viable skinAmount Absorbed (mg)% Absorbed+/-% Absorbed
96      0.00060.4870.015212.3452.5512.345
Maximal Flux (mcrg/cm2/h)Average Flux (mcrg/cm2/h)+/-Time Plasma/Blood Levels Peaked (h)Peak Blood Concentration (mg/l)nkp (cm/h)Lag Time (h)
     5  

NOTES

Female hairless Sprague-Dawley rats were used. The application area was delimited by an open circular cell fixed by silicone glue to prevent spreading. % absorption was calculated by adding together the amounts found in the urine, faeces, epidermis + dermis of treated area and anumal body. The amount recovered in the stratum corneum was treated as unabsorbed.

REFERENCE

The Measurement Of The Stratum Corneum Reservoir. A Predictive Method For In Vivo Percutaneous Absorption Studies (1985) J. Investig. Dermatol., 84 :66-68