# An electron spin resonance study of the soy bean phosphatidylcholine-based reversed micelles.

### Citation:

VD Fedotov, Natalija N Vylegzhanina, AE Altshuler, VI Shlenkin, Yu. F Zuev, and N Garti. 1998. “An electron spin resonance study of the soy bean phosphatidylcholine-based reversed micelles.” Applied Magnetic Resonance, 14, 4, Pp. 497–512.

### Abstract:

The ESR spectra of 1-palmitoyl-2-stearoyl-(n-doxyl)-glycero-3-phosphocholine spin label positional isomers (n = 5, 7, 10, 12 and 16) were studied in soy bean phosphatidylcholine (SPC)-based microemulsions with various vol. fractions of disperse phase over the wide temp. range. The max. hyperfine splitting 2Amax and the order parameters S were taken as indexes of the rotational mobility and the motion spatial restrictions of the labeled lipid chain segments. The temps. Ttr at which sharp enhancements of 2Amax and S occur depend on concn. and size of the reversed micelles in solns. To explain this, a plausible model, taking into account capability of the SPC mol. hydrocarbon chains to change a tilt angle with respect to the surface of a polar head group as temp. varies, is proposed. The estns. of the correlation times $\tau$sl obtained from the lineshape characteristics of the ESR spectra provided the possibility to suggest that these correlation times characterize the reorientations of the SPC chain axis about the normal to the surface of a polar head group of a reversed micelle. [on SciFinder(R)]
Last updated on 05/27/2020