Chain ordering of Stratum corneum lipids investigated by EPR slow-tumbling simulation.
We investigated the chain ordering of the lipid bilayer of Stratum corneum (SC) using an electron paramagnetic resonance (EPR) spin probe method in conjunction with slow-tumbling simulation. The ordering of SC lipids was evaluated by analysis of the signals of 5-doxylstearic acid (5-DSA) spin probe incorporated into the lamellar lipids. The result obtained with the conventional method of calculating the order parameter using hyperfine values was 0.80. The value of the order parameter obtained by spectral simulation was 0.73. It was found that the conventional method of calculating the chain ordering using hyperfine values could not differentiate subtle EPR spectral changes. However, EPR slow-tumbling simulation can differentiate such subtle spectral changes. Thus, the present EPR investigation suggests that simulation provides more detail about the structure of the lipid bilayer than the conventional method.
Nakagawa
K
K
RI Research Center, Fukushima Medical University, 1 Hikarigaoka, Fukushima 960-1295, Japan. nakagawa@fmu.ac.jp
Mizushima
J
J
Takino
Y
Y
Sakamoto
K
K
Maibach
H I
HI
D003198:Computer Simulation; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D005227:Fatty Acids / Q000032:analysis; D006801:Humans; D008055:Lipids / Q000032:analysis*; D012867:Skin / Q000737:chemistry*; D013113:Spin Labels; D013816:Thermodynamics
D005227:Fatty Acids; D008055:Lipids; D013113:Spin Labels