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- W1986241478 abstract "Octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) are cyclic siloxanes used as chemical intermediates with some applications in consumer products. The in vitro percutaneous absorption of 14C-D4 and 14C-D5 was studied in flow-through diffusion cells. Single doses were applied neat and in antiperspirant formulations to dermatomed human skin for 24h. The majority of applied D4 and D5 ( approximately 90%) volatilized before being absorbed. Only 0.5% of applied D4 was absorbed while the absorption of D5 (0.04%) was one order of magnitude lower. The largest percentage (>90%) of the absorbed D4 and D5 was found in the skin. The fate of D4 and D5 absorbed in the skin was studied in rat in vivo. A single dose of 14C-D4 (10, 4.8 and 2mg/cm2) and 14C-D5 (10mg/cm2) was topically applied inside a dosing chamber attached to the dorsal area. Rats were housed in metabolism cages up to 24h to enable collection of urine, feces, expired/escaped volatiles. The majority of applied D4 or D5 had volatilized from the skin surface. Less than 1.0% of the applied D4 and only 0.2% of applied D5 was absorbed with approximately 60% of absorbed D4 and 30% of absorbed D5 reaching systemic compartments. The amount absorbed into the skin decreased with time showing that residual D4 and D5 diffused back to the skin surface and continued to evaporate. Overall, a low tendency to pass through the skin into systemic compartments was demonstrated for both D4 (< or = 0.5% of applied dose) and D5 (<0.1% of applied dose)." @default.
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- W1986241478 date "2008-03-01" @default.
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- W1986241478 title "In vitro and In vivo percutaneous absorption of 14C-octamethylcyclotetrasiloxane (14C-D4) and 14C-decamethylcyclopentasiloxane (14C-D5)" @default.
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- W1986241478 doi "https://doi.org/10.1016/j.yrtph.2007.11.003" @default.
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