Open AccessMicrobeam X-ray diffraction study of lipid structure in stratum corneum of human skin
Author(s) -
Naoto Yagi,
Koki Aoyama,
Nobuhiro Ohta
Publication year - 2020
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0233131
Subject(s) - stratum corneum , microbeam , corneocyte , diffraction , x ray crystallography , materials science , crystallography , perpendicular , optics , chemistry , physics , biology , genetics , geometry , mathematics
Human skin, not previously frozen, was studied by small-angle X-ray diffraction. The samples were folded so that a 6μm X-ray beam passed through the top layer of skin, stratum corneum. Diffraction patterns recorded with this method consisted of peaks at about q = 0.5, 1.0 and 1.4 nm -1 in the direction perpendicular to the skin surface more clearly than in previous studies. These peaks are interpreted to arise from lipids between corneocytes. A simple unit of a linear electron density profile with three minima was used to account for the observed intensity profiles. Combinations of calculated diffraction from models with one, two and three units accounted for the major part of the observed diffraction pattern, showing the diversity in the structure of the intercellular lipids.