An ImmunoChip prototype for simultaneous detection of antiepileptic drugs using an enhanced one-step homogeneous immunoassay.
The development and characterization of a one-step homogeneous immunoassay-based multiwell ImmunoChip is reported for the simultaneous detection and quantitation of antiepileptic drugs (AEDs). The assay platform uses a cloned enzyme donor immunoassay (CEDIA) and a Beta-Glo assay system for generation of bioluminescent signal. Results of the one-step CEDIA for three AEDs (carbamazepine, phenytoin, and valproic acid), in the presence of serum, correlate well with the values determined by fluorescence polarization immunoassay. CEDIA intra- and interassay coefficients of variation are less than 10%. A microfabrication process, xurography, was used to produce the multiwell ImmunoChip. Assay reagents were dispensed and lyophilized in a three-layer pattern. The multiwell ImmunoChip prototype was used to detect and quantify AEDs in serum samples containing all three drugs. Luminescent signals generated from each well were recorded with a charge-coupled device (CCD) camera. The assays performed on an ImmunoChip were fast (5 min), requiring only small volumes of both the reagents (<1 microl/well) and the serum sample. The ImmunoChip assay platform described in this article may be well suited for therapeutic monitoring of drugs and metabolites at the point-of-care setting.
Yang
Xiaoyun
X
Department of Bioengineering, University of Utah, Salt Lake City, UT 84112, USA.
Janatova
Jarmila
J
Juenke
Joetta M
JM
McMillin
Gwendolyn A
GA
Andrade
Joseph D
JD
D000927:Anticonvulsants / Q000032:analysis*; D002220:Carbamazepine / Q000032:analysis*; D006801:Humans; D007118:Immunoassay / Q000295:instrumentation* / Q000379:methods*; D010672:Phenytoin / Q000032:analysis*; D011933:Reagent Kits, Diagnostic; D012680:Sensitivity and Specificity; D014635:Valproic Acid / Q000032:analysis*
D000927:Anticonvulsants; D011933:Reagent Kits, Diagnostic; D002220:Carbamazepine; D014635:Valproic Acid; D010672:Phenytoin