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Srovnávací in vitro studie permeace vybraných léčiv z lipofilních roztoků přes lidskou kůži
Koláčková, Lenka ; Doležal, Pavel (advisor) ; Zbytovská, Jarmila (referee)
A COMPARISON IN VITRO STUDY OF PERMEATION OF SELECTED DRUGS FROM LIPOPHILIC SOLUTIONS TROUGH HUMAN SKIN ABSTRACT The aim of the study was to compare the permeation of testosterone (TST), caffeine (CAF), flufenamic acid (FA) and benzoic acid (BA) from highly liquid paraffin through human heat-separated epidermis (HSE). For evaluation of saturation concentration of the drugs in the vehicle(csat), an excess of BA, CAF, FA or TST was suspended in 5 ml of highly liquid paraffin in a screw top scintillation vial (500 rpm, 32 řC; 24 h). After sedimentation of non- dissolved substance, samples were drawn from the supernatant, diluted 1:10 with dichloromethane and analyzed via UV/VIS-spectroscopy: (Lambda 35; Perkin Elmer, BA 228 nm; CAF 277 nm; FA 287 nm; TST 238 nm). Permeation experiments over human HSE of two donors (6 pieces of each) were performed in Franz diffusion cells at 32 řC. The donor was composed of TST, FA, BA (0.4 mg/ml), CAF (0.1 mg/ml) dissolved in paraffin. Samples of 0.4 ml were collected over the time, replaced by fresh acceptor solution (Soerensen phosphate buffer pH 7.4) and quantified by validated HPLC methods. The steady state flux (J) was evaluated from the linear part of cumulative amount versus time plots and dividing it by donor concentration (cdon), the apparent permeability coefficient...
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Srovnávací in vitro studie permeace vybraných léčiv z lipofilních roztoků přes lidskou kůži
Koláčková, Lenka ; Doležal, Pavel (advisor) ; Zbytovská, Jarmila (referee)
A COMPARISON IN VITRO STUDY OF PERMEATION OF SELECTED DRUGS FROM LIPOPHILIC SOLUTIONS TROUGH HUMAN SKIN ABSTRACT The aim of the study was to compare the permeation of testosterone (TST), caffeine (CAF), flufenamic acid (FA) and benzoic acid (BA) from highly liquid paraffin through human heat-separated epidermis (HSE). For evaluation of saturation concentration of the drugs in the vehicle(csat), an excess of BA, CAF, FA or TST was suspended in 5 ml of highly liquid paraffin in a screw top scintillation vial (500 rpm, 32 řC; 24 h). After sedimentation of non- dissolved substance, samples were drawn from the supernatant, diluted 1:10 with dichloromethane and analyzed via UV/VIS-spectroscopy: (Lambda 35; Perkin Elmer, BA 228 nm; CAF 277 nm; FA 287 nm; TST 238 nm). Permeation experiments over human HSE of two donors (6 pieces of each) were performed in Franz diffusion cells at 32 řC. The donor was composed of TST, FA, BA (0.4 mg/ml), CAF (0.1 mg/ml) dissolved in paraffin. Samples of 0.4 ml were collected over the time, replaced by fresh acceptor solution (Soerensen phosphate buffer pH 7.4) and quantified by validated HPLC methods. The steady state flux (J) was evaluated from the linear part of cumulative amount versus time plots and dividing it by donor concentration (cdon), the apparent permeability coefficient...
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