Summary
The influence of anatomic site on the relationship between total penetration of a molecule and its quantities present in the stratum corneum (SC) 30 min after application was quantified in an in vivo study. For each site, six male volunteers received two symmetrical applications of 1,000 nmol benzoic acid 14C to an area of 1 cm2 for 30 min. The first application permitted measurement of total absorption of benzoic acid within 4 days (urinary excretion method), while the second enabled determination of the quantity of benzoic acid in the SC at the end of the application time. Total penetration according to site is: back < arm < chest < thigh < abdomen < forehead, (with the forehead being three times more permeable than the back). Whatever the sites and the origin of the differences observed, the results show that the single measurement of the amounts of a compound present in the SC at 30 min postapplication appears sufficient to predict its total penetration, these two parameters being linearly correlated (r=0.97, P<0.001).
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Rougier, A., Dupuis, D., Lotte, C. et al. Regional variation in percutaneous absorption in man: measurement by the stripping method. Arch Dermatol Res 278, 465–469 (1986). https://doi.org/10.1007/BF00455165
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DOI: https://doi.org/10.1007/BF00455165