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• W2034017705 abstract "The effect of α-tocopherol on the lipid fluidity of porcine intestinal brush-border membranes was studied using pyrene as a fluorescent probe. Addition of α-tocopherol to the medium decreased fluorescence intensity and lifetime, but increased the fluorescence polarization of pyrene-labeled membranes. β-, γ-, and δ-Tocopherols gave no appreciable effect on the fluorescence intensity and polarization of the complex. The apparent dissociation constant (3.1 ± 0.12 μM) of the interaction of α-tocopherol with the membranes, estimated from the change in the fluorescence intensity with varying concentrations of α-tocopherol, was in good agreement with the concentration required to cause the half-maximal inhibition of lipid peroxidation of the membranes performed by incubation with 100 μM ascorbic acid and 10 μM Fe2+. Decrease of the slope in the thermal Perrin plot of the polarization of pyrene-labeled membranes by α-tocopherol suggests that the movement of pyrene molecules in the membranes is restricted by binding of the tocopherol. This interpretation was confirmed by an increased harmonic mean of the rotational relaxation time of the dye molecules in the membranes from 10.9 ± 0.16 to 18.5 ± 0.51 μs after addition of 25 μM α-tocopherol to the medium. The perturbation of lipid phase in the membranes induced by α-tocopherol was also suggested from a decreased quenching rate constant of pyrene fluorescence in the membranes for Tl+. Based on these results, the effect of α-tocopherol on the lipid fluidity of the membranes is discussed." @default.
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• W2034017705 date "1986-06-01" @default.
• W2034017705 modified "2023-09-25" @default.
• W2034017705 title "Effects of α-tocopherol on the lipid peroxidation and fluidity of porcine intestinal brush-border membranes" @default.
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• W2034017705 doi "https://doi.org/10.1016/0005-2736(86)90334-2" @default.
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