Bunge AL, Cleek RL. A new method for estimating dermal absorption from chemical exposure: 2. Effect of molecular weight and octanol-water partitioning.
Pharm Res 1995;
12:88-95. [PMID:
7724493 DOI:
10.1023/a:1016242821610]
[Citation(s) in RCA: 98] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A new method for estimating dermal absorption including the effects of exposure time and chemistry is described generally in Part 1 of this series. This method accounts for the larger absorption rates during the initial exposure period as well as the hydrophilic barrier which the viable epidermis presents to lipophilic chemicals. A key parameter in this procedure, the ratio of the stratum corneum and epidermis permeabilities (B) depends on molecular weight and octanol-water partitioning. Several approaches for approximating B and its affect on the dermal absorption prediction are discussed here. Generally, the parameter B is only important for highly lipophilic chemicals which also have relatively small molecular weights. When B is important, the recommended prediction for B is based on the Potts and Guy correlation for human stratum corneum permeability.
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