Dual lifetime referenced fluorometry for the determination of doxorubicin in urine.

Abstract

Dual lifetime referencing (DLR) is introduced as a rapid and self-referenced method for measuring the concentration of a fluorescent analyte in solution. The fluorescent cancer chemotherapeutic doxorubicin was chosen as a medically relevant analyte and blended with a reference dye (Ru(dpp)(3)) that displays overlapping excitation and emission spectra. The relative contributions of the short-lived (nanoseconds) fluorescent analyte and the long-lived (microseconds) reference dye define the observed lifetime. Measuring this lifetime by both frequency-domain DLR and time-domain DLR yields similar analytical ranges and limits of detection (0.4 μM). To assess the matrix effect of medical samples, the standard addition method was employed to both modes of DLR. Urine was spiked with doxorubicin and recovery rates of ≥97% were obtained.

• Authors: Fernando Martínez Ferreras, Otto S Wolfbeis, Hans H Gorris
• Journal: Analytica chimica acta (Anal Chim Acta) Vol. 729 Pg. 62-6 (Jun 04 2012) ISSN: 1873-4324 [Electronic] Netherlands
• PMID: 22595434 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2012 Elsevier B.V. All rights reserved.

Chemical References

• Antibiotics, Antineoplastic
• Fluorescent Dyes
• Organometallic Compounds
• Phenanthrolines
• Doxorubicin
• tris(4,7-diphenyl-1,10-phenanthroline)ruthenium (II)

Topics

• Antibiotics, Antineoplastic (urine)
• Doxorubicin (urine)
• Fluorescent Dyes (chemistry)
• Fluorometry (methods)
• Humans
• Limit of Detection
• Organometallic Compounds (chemistry)
• Phenanthrolines (chemistry)