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- W2011519246 abstract "The dyes carboxy-SNARF-1 and BCECF are fluorescent probes of intracellular pH that exhibit changes in spectral shape upon proton binding which allow one to use measurements of fluorescence at two or more wavelengths in order to measure pH without artifacts associated with variability in dye loading, etc. In evaluating these dyes for this study, whole spectra, rather than measurements at two wavelengths, were analyzed. For BCECF, the effects of the intracellular milieu were minimal: both the pH-sensitive excitation spectrum and the pKa agreed closely with values found in extracellular solution. In contrast, both the spectra and the pKa for the emission spectrum-shifting carboxy-SNARF-1 showed significant differences between intracellular and extracellular dye. As a result, extremely misleading values for intracellular pH will be obtained if one attempts to use extracellular dye to calibrate intracellular carboxy-SNARF-1 measurements. Multiple origins were found for the discrepancy: (i) the intracellular dye was found to be significantly quenched, with the deprotonated form being more strongly quenched than the protonated form; and (ii) the pKa for the equilibrium with intracellular hydrogen ions was shifted by +0.2 pH units. These effects were readily reversed by disruption of the cell, but were not due to sequestering of dye in an acidic cell compartment." @default.
- W2011519246 created "2016-06-24" @default.
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- W2011519246 date "1992-07-01" @default.
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- W2011519246 title "Comparison of spectrum-shifting intracellular pH probes 5′(and 6′)-carboxy-10-dimethylamino-3-hydroxyspiro[7H-benzo[c]xanthene-7, 1′(3′H)-isobenzofuran]-3′-one and 2′,7′-biscarboxyethyl-5(and 6)-carboxyfluorescein" @default.
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- W2011519246 doi "https://doi.org/10.1016/0003-2697(92)90140-3" @default.
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