title: 2',7'-bis-(2-carboxyethyl)-5(6)-carboxyfluorescein as a dual-emission fluorescent indicator of intracellular pH suitable for argon laser confocal microscopy.
abstract: The widely used fluorescent probe 2',7'-bis-(2-carboxyethyl)-5(6)-carboxyfluorescein (BCECF) serves as a pH-sensitive indicator in classical microscopy. Characteristics of BCECF were studied and a way of employing the probe in a confocal laser scanning microscope equipped with an argon laser at 488 nm was developed, based on the fact that the emission fluorescence spectra are pH-dependent with spectral maximum shift from 518 to 529 nm. Optical filters for the dual-emission ratio method were set to 506 and 529 nm. pH values measured inside a single cell of Saccharomyces cerevisiae were similar to those obtained with other pH estimation methods.
authors.affiliation: Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
authors.forename: E
authors.initials: E
authors.lastname: Lanz
authors.forename: J
authors.initials: J
authors.lastname: Slavík
authors.forename: A
authors.initials: A
authors.lastname: Kotyk
mesh_terms: D001128:Argon; D005434:Flow Cytometry / Q000379:methods; D005452:Fluoresceins; D005456:Fluorescent Dyes; D006863:Hydrogen-Ion Concentration; D007424:Intracellular Fluid / Q000378:metabolism*; D007834:Lasers; D018613:Microscopy, Confocal / Q000379:methods*; D012441:Saccharomyces cerevisiae / Q000378:metabolism; D013050:Spectrometry, Fluorescence
chemical_list: D005452:Fluoresceins; D005456:Fluorescent Dyes; D001128:Argon; C043829:2',7'-bis(carboxyethyl)-5(6)-carboxyfluorescein