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Dodecylbenzene sulphonate (DOBC) was studied in in vitro penetration study through rat skin and human epidermis. Two test solutions of the [14C] DOBS were used, the first a 3 mM solution in 25% v/v Polyethylene Glycol 400 in water and a second a 3 mM suspension in water. 0.25 mL of the test solution was applied to the rat skin (4.9 cm²) and 0.1 mL to the human epidermal samples (0.78 cm²). The concentration of the test material in solutions was 1.2 mg/mL. After 2, 6 and 24 hours (rats) or after 0.5, 1, 2, 3, 4, 6, 7, 8, 24 and 48 hours (human) of exposure, the skin samples were washed with excess of water and the radioactivity was measured in the rinsings and in the tested skin samples to determine the penetration rates. The results show no measurable penetration (<0.1 µg/cm²) of DOBS through the rat skin up to 24 hours. DOBC did not penetrate human epidermis as well (<0.1 µg/cm²). 30% [14C] DOBS was recovered in the rinsings and 70% remained accociated with the skin of rats. 30-50% of [14C] DOBC retained in the human epidermis after rinsing.
To calculate percutaneous absorption rates, penetration of 0.1 µg/cm², the lower limit of detection was taken as worst-case. Based on the applied amount of 0.25 mL to the rat skin (4.9 cm²) and 0.1 mL to the human epidermis (0.78 cm²) and taken into account concentration of DOBC in vehicle of 1.2 mg/mL, 0.16% and 0.065% absorption through the skin was calculated for the rat skin and human epidermis, respectively.
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