1 March 2009 Calibration beads containing luminescent lanthanide ion complexes
Author Affiliations +
J. of Biomedical Optics, 14(2), 024022 (2009). doi:10.1117/1.3103646
The reliability of lanthanide luminescence measurements, by both flow cytometry and digital microscopy, would be enhanced by the availability of narrowband emitting, UV excited lanthanide calibration beads. 0.5-, 3-, and 5-μm beads containing a luminescent europium-complex are manufactured. The luminescence distribution of the 5-μm beads is measured with a time-delayed light-scatter-gated luminescence flow cytometer to have a 7.0% coefficient of variation (CV) The spacial distribution of the europium-complex in individual beads is determined to be homogeneous by confocal microscopy. Emission peaks are found at 592, 616 (width 9.9 nm), and 685 nm with a PARISS® spectrophotometer. The kinetics of the luminescence bleaching caused by UV irradiation of the 0.5- and 5-μm beads measured under LED excitation with a fluorescence microscope indicate that bleaching does not interfere with their imaging. The luminescence lifetimes in water and air were 340 and 460 μs, respectively. Thus, these 5-μm beads can be used for spectral calibration of microscopes equipped with a spectrograph, as test particles for time-delayed luminescence flow cytometers, and possibly as labels for macromolecules and cells.
Robert C. Leif, Sean Yang, Dayong Jin, James A. Piper, Lidia M. Vallarino, John W. Williams, Robert M. Zucker, "Calibration beads containing luminescent lanthanide ion complexes," Journal of Biomedical Optics 14(2), 024022 (1 March 2009). https://doi.org/10.1117/1.3103646




Ultraviolet radiation


Ultraviolet light emitting diodes


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