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

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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结合使用两种膜电位敏感染料来测定仿生油/水界面上的伽伐尼电位差

DOI:
10.1007/s00216-014-7776-x
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发表时间:
2014
期刊:
Anal. Bioanal. Chem.
影响因子:
--
通讯作者:
Toshiyuki Osakai
Toshiyuki Osakai
中科院分区:
--
文献类型:
--
作者:
Tatsuya Yoshimura;Hirohisa Nagatani;Toshiyuki Osakai

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阴离子膜电位敏感染料双(1,3-二丁基巴比妥酸)三甲川氧杂菁 (DiBAC4(3)) 和双-(1,3-二乙基硫代巴比妥酸)三甲川氧杂菁 (DiSBAC2(3)) 在仿生 1,2-二氯乙烷 (DCE)/水 (W) 下的荧光行为 通过电位调制荧光(PMF)光谱研究界面。由于 DCE/W 界面处的吸附/解吸,相应的染料给出了明确的 PMF 信号。研究还发现,两种染料发出 PMF 信号的电位相差约 100 mV。然后,我们尝试结合使用两种染料来测定 DCE/W 界面上的伽伐尼电势差。当 40 μM DiBAC4(3) 和 15 μM DiSBAC2(3) 最初添加到 W 相中时,不同界面电位获得明显不同的光谱。 530 和 575 nm(相应染料的荧光最大波长)处的 PMF 信号强度之比显示出对界面电位的明显依赖性。这些结果表明联合使用两种染料在测定体内膜电位方面的潜在效用。图联合使用两种膜电位敏感染料,在其特定的吸附电位下显示不同颜色的荧光发射。
The fluorescence behavior of anionic membrane-potential-sensitive dyes,bis-(1,3-dibutylbarbituric acid) trimethine oxonol (DiBAC4(3)) andbis-(1,3-diethylthiobarbituric acid)trimethine oxonol (DiSBAC2(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 DiBAC4(3) and 15 μM DiSBAC2(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.FigureCombined use of two membrane-potential-sensitive dyes that show different colors of fluorescence emission at their specific adsorption potentials.
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