Sequestration, fluorometric detection, and mass spectroscopy analysis of lanthanide ions using surface modified magnetic microspheres for microfluidic manipulation.
Several methods for rapid sequestration, fluorometric detection, and the subsequent mass spectroscopic analysis of lanthanide ions using surface modified polystyrene magnetic microspheres are demonstrated. Mixed-ligand antenna complexes of Eu(3+) in which one of the ligands is attached to the surface of the microspheres have been used as a means for the sequestration, immobilization, and detection of these ions. Using the ion-exchange properties of these microspheres, this scheme has been extended to the detection of nonluminescent ions. The principles of these assays form the basis for operation of a portable microfluidic device for general analytical and nuclear forensics applications and indicate the manner in which the established methods of analytical chemistry, such as liquid-liquid extraction and ion-exchange chromatography, can be adapted for such miniature devices.
Shkrob
Ilya A
IA
Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Ave, Argonne, Illinois 60439, USA. shkrob@anl.gov
Kaminski
Michael D
MD
Mertz
Carol J
CJ
Rickert
Paul G
PG
Derzon
Mark S
MS
Rahimian
Kamyar
K