Distinctive pressure effects on partitioning and rotational motions of nitroxide spin probes in dispersions of a triglyceride membrane

Shinpei Iwamoto, Daisuke Yoshioka, Yoshimi Sueishi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The effects of pressure were examined for the partitioning and rotational correlation time of nitroxide probes, TEMPO and DTBN, in dispersions of a triglyceride membrane. As external pressures increased, nitroxide probes shifted from the vesicle phase to the aqueous phase. Rotational correlation times of TEMPO and DTBN in the vesicle phase, determined from ESR line broadening, increased remarkably with increasing pressure, dependent of the molecular size of the nitroxide probes: ΔV = 65.6 cm3 mol-1 for TEMPO and 24.4 cm3 mol-1 for DTBN. Based on the results, the microscopic properties inside the triglyceride membrane are discussed.

Original languageEnglish
Pages (from-to)314-318
Number of pages5
JournalChemical Physics Letters
Volume430
Issue number4-6
DOIs
Publication statusPublished - Oct 30 2006

Fingerprint

Pressure effects
pressure effects
Dispersions
Triglycerides
membranes
Membranes
probes
Paramagnetic resonance
TEMPO

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces
  • Condensed Matter Physics

Cite this

Distinctive pressure effects on partitioning and rotational motions of nitroxide spin probes in dispersions of a triglyceride membrane. / Iwamoto, Shinpei; Yoshioka, Daisuke; Sueishi, Yoshimi.

In: Chemical Physics Letters, Vol. 430, No. 4-6, 30.10.2006, p. 314-318.

Research output: Contribution to journalArticle

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AB - The effects of pressure were examined for the partitioning and rotational correlation time of nitroxide probes, TEMPO and DTBN, in dispersions of a triglyceride membrane. As external pressures increased, nitroxide probes shifted from the vesicle phase to the aqueous phase. Rotational correlation times of TEMPO and DTBN in the vesicle phase, determined from ESR line broadening, increased remarkably with increasing pressure, dependent of the molecular size of the nitroxide probes: ΔV‡ = 65.6 cm3 mol-1 for TEMPO and 24.4 cm3 mol-1 for DTBN. Based on the results, the microscopic properties inside the triglyceride membrane are discussed.

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