title: A 5-kg time-resolved luminescence photometer with multiple excitation sources.
abstract: A luminescence photometer was developed based on lanthanide-sensitized luminescence to detect environmental pollutants and residues in foods including, in particular, two classes of antibiotics: tetracyclines and fluoroquinolones. Multiple excitation sources, a xenon flashlamp and ultraviolet light-emitting diodes (UV LEDs), were used to their advantages. A photomultiplier tube module, gated to reject time-domain interferences, was used as a photodetector. Using danofloxacin as a model analyte, luminescence signal was linear in more than three decades (0.5-2000 ng/mL) with R(2) > 0.998 in each decade. This photometer achieved a limit of detection of 2.0 ng/mL with 1.3% average relative standard deviation. It is field deployable at 4.6 kg and 15 W power consumption.
authors.affiliation: U. S. Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, 600 E. Mermaid Lane, Wyndmoor, Pennsylvania 19038, USA. guoying.chen@ars.usda.gov
authors.forename: Guoying
authors.initials: G
authors.lastname: Chen
mesh_terms: D002138:Calibration; D004867:Equipment Design; D024841:Fluoroquinolones / Q000032:analysis; D016014:Linear Models; D008163:Luminescent Measurements / Q000295:instrumentation* / Q000379:methods*; D013752:Tetracycline / Q000032:analysis; D014978:Xenon
chemical_list: D024841:Fluoroquinolones; D014978:Xenon; D013752:Tetracycline