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PubMed1990

A spin label ESR and saturation transfer ESR study of alpha-tocopherol containing model membranes.

An investigation into the effect of alpha-tocopherol on phospholipid model membranes has been carried out by electron spin resonance (ESR) and saturation transfer ESR. The use of stearic acid and of perdeutero -di-t-butyl nitroxide spin probes has allowed us to monitor, in particular, the effect of alpha-tocopherol on both the phospholipid chain order and the phospholipid chain mobility. The results obtained are mainly consistent with a differing action of alpha-tocopherol in the gel and in the liquid crystalline phases: in the former it induces a decrease of order and an increase in fluidity; while in the latter phase an indication of a slight increase in ordering and a clear decrease in fluidity are registered.

1,2-Dipalmitoylphosphatidylcholine↗
PubMedDate not supplied

[Spin label study of microviscosity and structural transitions in cell membrane lipids and proteins. I. Heat-induced structural changes in cell nuclei of mouse organs in normal conditions].

With the help of weakly bound spin probes the effect of temperature on structural transitions of protein and lipid components in the nuclei membranes of different organs of intact mice has been studied. Microviscosity of lipids in the membrane is found to differ sharply from proteins. Found by both probes breaks on Arrhenius curve of the correlation time dependence on reverse temperature within the temperature range of 25degreesC--27degreesC and 40degreesC-43degreesC seem to be connected with structural reconstructions of the whole membrane. The results obtained according to the behaviour of probes are identical for the nuclei of different organs.

Animals↗