A hydrolytic reporter of Cu(II) availability in artificial liposomes

Giovanna Ghirlanda, Paolo Scrimin, Paolo Tecilla, Umberto Tonellato

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The dioctadecyl ammonium surfactant 1, functionalized with a p-nitrophenyl ester of picolinic acid, has been synthesized and its hydrolysis in covesicular blends of nonfunctional surfactants dihexadecyldimethylammonium bromide, 3, dioctadecyldimethylammonium bromide, 4, and racemic 1,2-bis(palmitoyloxy)-3-(trimethylammonium)propyl bromide, 5, studied after addition of Cu(II) ions at pH = 5.0 and different temperatures. The cleavage of 1 gives the p-nitrophenoxide surfactant 2, which shows a strong absorption band at 400 nm. Clear biphasic kinetics were observed for all vesicular systems at a temperature below the gel-to-liquid crystal phase transition temperature (Tc) of the membrane: the first, faster process (≈60% of the ester cleaved) was associated with the Cu(II)-catalyzed hydrolysis of the exovesicular ester; the slower one (the remaining ≈40% of the ester cleaved) was associated with the uncatalyzed hydrolysis of the endovesicular ester. Above Tc only a monoexponential process was observed. Variable temperature experiments allowed one to conclude that the cationic vesicles studied are totally impermeable to Cu(II) ions either below or above their Tc which controls the rate of the transbilayer movements of the lipids.

Original languageEnglish
Pages (from-to)3025-3029
Number of pages5
JournalJournal of Organic Chemistry
Volume58
Issue number11
Publication statusPublished - 1993

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Liposomes
Esters
Availability
Surface-Active Agents
Hydrolysis
Ions
Liquid Crystals
Bromides
Ammonium Compounds
Temperature
Absorption spectra
Phase transitions
Gels
Membranes
Lipids
Kinetics
Experiments

ASJC Scopus subject areas

  • Organic Chemistry

Cite this

Ghirlanda, G., Scrimin, P., Tecilla, P., & Tonellato, U. (1993). A hydrolytic reporter of Cu(II) availability in artificial liposomes. Journal of Organic Chemistry, 58(11), 3025-3029.

A hydrolytic reporter of Cu(II) availability in artificial liposomes. / Ghirlanda, Giovanna; Scrimin, Paolo; Tecilla, Paolo; Tonellato, Umberto.

In: Journal of Organic Chemistry, Vol. 58, No. 11, 1993, p. 3025-3029.

Research output: Contribution to journalArticle

Ghirlanda, G, Scrimin, P, Tecilla, P & Tonellato, U 1993, 'A hydrolytic reporter of Cu(II) availability in artificial liposomes', Journal of Organic Chemistry, vol. 58, no. 11, pp. 3025-3029.
Ghirlanda, Giovanna ; Scrimin, Paolo ; Tecilla, Paolo ; Tonellato, Umberto. / A hydrolytic reporter of Cu(II) availability in artificial liposomes. In: Journal of Organic Chemistry. 1993 ; Vol. 58, No. 11. pp. 3025-3029.
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