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Open AccessArticle

Simultaneous Measurements of Structure and Water Permeability in an Isolated Human Skin Stratum Corneum Sheet

1
School of Science and Technology, Kwansei Gakuin University, Sanda 669-1337, Japan
2
Department of Research, Nagoya Industrial Science Research Institute, Nagoya 460-0008, Japan
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(5), 829; https://doi.org/10.3390/polym11050829
Received: 29 March 2019 / Revised: 24 April 2019 / Accepted: 5 May 2019 / Published: 8 May 2019
(This article belongs to the Special Issue Selected Papers from ECIS 2018)
Stratum corneum (SC), the outermost layer of human skin, acts as an intelligent physicochemical interface between the inside and the outside of our body. To make clear the relationship between structure and physical barrier properties of SC, we developed a method that enables us to simultaneously acquire X-ray diffraction (XD) patterns and transepidermal water loss (TEWL) values using a spread SC sheet isolated from human skin. The synchrotron X-ray was incident on the SC sheet surface at an angle of 45° to avoid interference between the two kinds of measurements. Detailed comparison between XD and TEWL data suggested that the thermal behavior of water permeability is closely related to the thermal expansion of the lattice spacings of the hexagonal phases above 40 °C and to the existence ratio of the orthorhombic phase below 40 °C. Thus, the new method we developed can give useful information on the mechanism of water permeation in SC without ambiguity caused by separate measurements of structure and water permeability with different samples. View Full-Text
Keywords: intercellular lipid; stratum corneum; transepidermal water loss; wide-angle X-ray diffraction intercellular lipid; stratum corneum; transepidermal water loss; wide-angle X-ray diffraction
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MDPI and ACS Style

Nakazawa, H.; Imai, T.; Suzuki, M.; Akakabe, N.; Hatta, I.; Kato, S. Simultaneous Measurements of Structure and Water Permeability in an Isolated Human Skin Stratum Corneum Sheet. Polymers 2019, 11, 829.

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