Synthesis and Characterization of 8-O-Carboxymethylpyranine (CM-Pyranine) As a Bright, Violet-Emitting, Fluid-Phase Fluorescent Marker in Cell Biology

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2015 Jul 18

PMID 26186650

Citations 5

Authors

Eric A Legenzov

Nathaniel D A Dirda

Brian M Hagen

Joseph P Y Kao

Affiliations

Soon will be listed here.

Abstract

To avoid spectral interference with common fluorophores in multicolor fluorescence microscopy, a fluid-phase tracer with excitation and emission in the violet end of the visible spectrum is desirable. CM-pyranine is easily synthesized and purified. Its excitation and emission maxima at 401.5 nm and 428.5 nm, respectively, are well suited for excitation by 405-nm diode lasers now commonly available on laser-scanning microscopes. High fluorescence quantum efficiency (Q = 0.96) and strong light absorption (ε405 > 25,000 M-1cm-1) together make CM-pyranine the brightest violet aqueous tracer. The fluorescence spectrum of CM-pyranine is invariant above pH 4, which makes it a good fluid-phase marker in all cellular compartments. CM-pyranine is very photostable, is retained for long periods by cells, does not self-quench, and has negligible excimer emission. The sum of its properties make CM-pyranine an ideal fluorescent tracer. The use of CM-pyranine as a fluid-phase marker is demonstrated by multicolor confocal microscopy of cells that are also labeled with lipid and nuclear markers that have green and red fluorescence emission, respectively.

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