Abstract
Abstract The chain ordering of a triglycerol membrane was investigated by continuous wave (CW) electron spin resonance (ESR) in conjunction with a spin probe method. Order parameters (S0) obtained by a slow-tumbling computational analysis for 7-doxylstearic acids (7-DSA), 12-DSA, and 16-DSA in poly(oxyethylene) hydrogenated castor oil (HCO) membrane at 20 °C were 0.68, 0.25, and 0.04, respectively. The S0 results suggest that the membrane chains are well ordered around the probe moiety for 7-DSA and very fluid around the 16-DSA moiety in the HCO membrane. The relative magnitude of the chain order for 12-DSA was very different from that obtained by the conventional order parameter using hyperfine coupling values. The conventional hyperfine analysis cannot verify the subtle spectral changes for 12-DSA. Moreover, the S0 values for 7- and 12-DSA decreased differently when the temperature increased. Thus, the results obtained by a slow-tumbling simulation revealed detailed membrane chain ordering.
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