Paige N Zambrana1, Peng Hou2, Dana C Hammell1, Tonglei Li3, Audra L Stinchcomb4. 1. Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, Maryland, 21201, USA. 2. Department of Industrial & Physical Pharmacy, Purdue University, West Lafayette, Indiana, 47907, USA. 3. Department of Industrial & Physical Pharmacy, Purdue University, West Lafayette, Indiana, 47907, USA. tonglei@purdue.edu. 4. Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, Maryland, 21201, USA. astinchc@rx.umaryland.edu.
Abstract
PURPOSE: It is often unclear how complex topical product formulation factors influence the transport kinetics through skin tissue layers, because of multiple confounding attributes. Environmental factors such as temperature effect are also poorly understood. In vitro permeation testing (IVPT) is frequently used to evaluate drug absorption across skin, but the flux results from these studies are from a combination of mechanistic processes. METHOD: Two different commercially available formulations of oxybenzone-containing sunscreen cream and continuous spray were evaluated by IVPT in human skin. Temperature influence between typical skin surface temperature (32°C) and an elevated 37°C was also assessed. Furthermore, a multiphysics-based simulation model was developed and utilized to compute the flux of modeled formulations. RESULTS: Drug transport kinetics differed significantly between the two drug products. Flux was greatly influenced by the environmental temperature. The multiphysical simulation results could reproduce the experimental observations. The computation further indicated that the drug diffusion coefficient plays a dominant role in drug transport kinetics, influenced by the water content which is also affected by temperature. CONCLUSION: The in vitro testing and bottom-up simulation shed insight into the mechanism of dermal absorption kinetics from dissimilar topical products.
PURPOSE: It is often unclear how complex topical product formulation factors influence the transport kinetics through skin tissue layers, because of multiple confounding attributes. Environmental factors such as temperature effect are also poorly understood. In vitro permeation testing (IVPT) is frequently used to evaluate drug absorption across skin, but the flux results from these studies are from a combination of mechanistic processes. METHOD: Two different commercially available formulations of oxybenzone-containing sunscreen cream and continuous spray were evaluated by IVPT in human skin. Temperature influence between typical skin surface temperature (32°C) and an elevated 37°C was also assessed. Furthermore, a multiphysics-based simulation model was developed and utilized to compute the flux of modeled formulations. RESULTS: Drug transport kinetics differed significantly between the two drug products. Flux was greatly influenced by the environmental temperature. The multiphysical simulation results could reproduce the experimental observations. The computation further indicated that the drug diffusion coefficient plays a dominant role in drug transport kinetics, influenced by the water content which is also affected by temperature. CONCLUSION: The in vitro testing and bottom-up simulation shed insight into the mechanism of dermal absorption kinetics from dissimilar topical products.
Authors: Soo Hyeon Shin; Priyanka Ghosh; Bryan Newman; Dana C Hammell; Sam G Raney; Hazem E Hassan; Audra L Stinchcomb Journal: Pharm Res Date: 2017-06-12 Impact factor: 4.200
Authors: Jinsong Hao; Priyanka Ghosh; S Kevin Li; Bryan Newman; Gerald B Kasting; Sam G Raney Journal: Expert Opin Drug Deliv Date: 2016-01-25 Impact factor: 6.648