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Since its introduction in 1998, genetically encoded pH-sensitive sensor ratiometric pHluorin proved to be a valuable tool for cell physiology studies. Here, we show how the sensitivity of pHluorin-based monitoring of intracellular pH changes performed with cell suspensions can be enhanced by using synchronously scanned fluorescence spectroscopy. In the suspensions of S. cerevisiae cells subjected to varying extracellular pH values, we have been able to measure statistically significant changes in intracellular pH of less than 0.1 unit, which were not detectable using a standard ratiometric approach.

Citation

Jaromír Plášek, Adéla Melcrová, Dana Gášková. Enhanced sensitivity of pHluorin-based monitoring of intracellular pH changes achieved through synchronously scanned fluorescence spectra. Analytical chemistry. 2015 Oct 6;87(19):9600-4

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PMID: 26325679

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