Membrane-buffer partition coefficients of semiquinones using the spin-broadening technique

Antonio E. Alegría, Sandra Rivera, Marilyn Hernández, Rafael Ufret, Mariely Morales

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Membrane-buffer partition coefficients have been determined for 1,4-benzosemiquinone (BQ.-), 1,4-naphthosemiquinone (NQ.-) and naphthazarin semiquinone (NZQ.-) in egg-yolk phosphatidylcholine (PC) multilamellar vesicles in sodium cacodylate buffer at pH 7.4, utilizing electron paramagnetic resonance (EPR) spectroscopy. Partition coefficients are in the order BQ.- < NZQ.- < NQ.-, which is the same order followed by the octanol-water partition coefficients of their parent neutral quinones. A method is proposed for the determination of the fraction of semiquinones at the membrane which are located in the hydrophobic inner site. This fraction also follows the same order as the partition coefficients.

Original languageEnglish (US)
Pages (from-to)3773-3777
Number of pages5
JournalJournal of the Chemical Society, Faraday Transactions
Volume89
Issue number20
DOIs
StatePublished - 1993

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partitions
Buffers
buffers
Cacodylic Acid
membranes
Membranes
Octanols
Quinones
coefficients
Phosphatidylcholines
Paramagnetic resonance
Sodium
Spectroscopy
Water
eggs
quinones
electron paramagnetic resonance
sodium
water
spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Membrane-buffer partition coefficients of semiquinones using the spin-broadening technique. / Alegría, Antonio E.; Rivera, Sandra; Hernández, Marilyn; Ufret, Rafael; Morales, Mariely.

In: Journal of the Chemical Society, Faraday Transactions, Vol. 89, No. 20, 1993, p. 3773-3777.

Research output: Contribution to journalArticle

Alegría, Antonio E. ; Rivera, Sandra ; Hernández, Marilyn ; Ufret, Rafael ; Morales, Mariely. / Membrane-buffer partition coefficients of semiquinones using the spin-broadening technique. In: Journal of the Chemical Society, Faraday Transactions. 1993 ; Vol. 89, No. 20. pp. 3773-3777.
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