Combined use of two membrane-potential-sensitive dyes for determination of the Galvani potential difference across a biomimetic oil/water interface

The fluorescence behavior of anionic membrane-potential-sensitive dyes, bis -(1,3-dibutylbarbituric acid) trimethine oxonol (DiBAC 4 (3)) and bis -(1,3-diethylthiobarbituric acid)trimethine oxonol (DiSBAC 2 (3)), at a biomimetic 1,2-dichloroethane (DCE)/water (W) interface was studied by the mean of...

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Veröffentlicht in:Analytical and bioanalytical chemistry 2014-05, Vol.406 (14), p.3407-3414
Hauptverfasser: Yoshimura, Tatsuya, Nagatani, Hirohisa, Osakai, Toshiyuki
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Nagatani, Hirohisa
Osakai, Toshiyuki
description The fluorescence behavior of anionic membrane-potential-sensitive dyes, bis -(1,3-dibutylbarbituric acid) trimethine oxonol (DiBAC 4 (3)) and bis -(1,3-diethylthiobarbituric acid)trimethine oxonol (DiSBAC 2 (3)), at a biomimetic 1,2-dichloroethane (DCE)/water (W) interface was studied by the mean of potential-modulated fluorescence (PMF) spectroscopy. The respective dyes gave a well-defined PMF signal due to the adsorption/desorption at the DCE/W interface. It was also found that the potentials where the two dyes gave the PMF signals were different by about 100 mV. We then attempted a combined use of the two dyes for determination of the Galvani potential difference across the DCE/W interface. When 40 μM DiBAC 4 (3) and 15 μM DiSBAC 2 (3) were initially added to the W phase, distinctly different spectra were obtained for different interfacial potentials. The ratio of the PMF signal intensities at 530 and 575 nm (the fluorescence maximum wavelengths for the respective dyes) showed a clear dependence on the interfacial potential. These results suggested the potential utility of the combined use of two dyes for the determination of membrane potentials in vivo. Figure Combined use of two membrane-potential-sensitive dyes that show different colors of fluorescence emission at their specific adsorption potentials.
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The respective dyes gave a well-defined PMF signal due to the adsorption/desorption at the DCE/W interface. It was also found that the potentials where the two dyes gave the PMF signals were different by about 100 mV. We then attempted a combined use of the two dyes for determination of the Galvani potential difference across the DCE/W interface. When 40 μM DiBAC 4 (3) and 15 μM DiSBAC 2 (3) were initially added to the W phase, distinctly different spectra were obtained for different interfacial potentials. The ratio of the PMF signal intensities at 530 and 575 nm (the fluorescence maximum wavelengths for the respective dyes) showed a clear dependence on the interfacial potential. These results suggested the potential utility of the combined use of two dyes for the determination of membrane potentials in vivo. Figure Combined use of two membrane-potential-sensitive dyes that show different colors of fluorescence emission at their specific adsorption potentials.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><pmid>24687435</pmid><doi>10.1007/s00216-014-7776-x</doi><tpages>8</tpages></addata></record>
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subjects Acids
Adsorption
Analysis
Analytical Chemistry
Barbiturates - chemistry
Biochemistry
Biomedical materials
Biomimetics
Characterization and Evaluation of Materials
Chemical properties
Chemistry
Chemistry and Materials Science
Chemistry Techniques, Analytical
Dyes
Electrochemistry
Ethylene Dichlorides - chemistry
Fluorescence
Fluorescent Dyes - chemistry
Food Science
In vivo testing
In vivo tests
Isoxazoles - chemistry
Laboratory Medicine
Mathematical analysis
Membrane Potentials
Molecular Structure
Monitoring/Environmental Analysis
Oils
Research Paper
Signal transduction
Spectra
Spectrometry, Fluorescence
Surface active agents
Water - chemistry
Wavelengths
title Combined use of two membrane-potential-sensitive dyes for determination of the Galvani potential difference across a biomimetic oil/water interface
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