Electron spin echo modulation studies of doxylstearic acid spin probes in frozen vesicle solutions. Interaction of the spin probe with {sup 31}P in the surfactant headgroups

Journal Article · Thu Jun 29 04:00:00 EDT 1995 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/j100026a027· OSTI ID:81313

Kurshev, V V; Kevan, L ^[1]

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1. Univ. of Houston, TX (United States)

Electron spin echo studies have been carried out for a series of x-doxylstearic acid (x = 5, 7, 10, 12, 16) spin probes in frozen aqueous solutions of zwitterionic DL-{alpha}-dipalmitoylphosphatidylcholine (DPPC) vesicles and anionic dihexadecyl phosphate (DHP) vesicles. Modulation effects due to interactions of the nitroxide moiety in the doxyl group of the spin probe with {sup 31}P in the surfactant headgroups prove to be an effective method to obtain quantitative information about the conformation of the spin probes and the nitroxide moiety location relative to the vesicle-water interface. The x-doxylstearic acid spin probe penetrates about 0.51 nm into DHP vesicles and to a lesser extent into DPPC vesicles. 26 refs., 11 figs., 1 tab.

• Sponsoring Organization: USDOE
• OSTI ID: 81313
• Journal Information: Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 26 Vol. 99; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
66 PHYSICS
ACOUSTIC ESR
AQUEOUS SOLUTIONS
ELECTRON PROBES
ELECTRON SPECTROSCOPY
MICELLAR SYSTEMS
MODULATION
OCTADECANOIC ACID
PHOSPHORUS 31
SPIN ECHO
SURFACTANTS