Microchip Electrophoretic Immunoassay for Serum Cortisol

An immunoassay performed using a microchip electrophoretic system is described. Separation and quantitation of free and bound labeled antigen in a competitive assay are carried out in channels micromachined into fused silica substrates. Such microchips are attractive because of their small size, rug...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 1996-01, Vol.68 (1), p.18-22
Main Authors: Koutny, Lance B, Schmalzing, Dieter, Taylor, Todd A, Fuchs, Martin
Format: Article
Language:English
Subjects:
Analytical, structural and metabolic biochemistry
Biochemistry
Biological and medical sciences
Biosensors
Blood
Electrophoresis - instrumentation
Fundamental and applied biological sciences. Psychology
Hormones
Humans
Hydrocortisone - blood
Immunoassay - instrumentation
Indicators and Reagents
Other biological molecules
Terpenes, steroids. Hormones
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Summary:An immunoassay performed using a microchip electrophoretic system is described. Separation and quantitation of free and bound labeled antigen in a competitive assay are carried out in channels micromachined into fused silica substrates. Such microchips are attractive because of their small size, ruggedness, and amenability to automated handling. The assay achieves the determination of cortisol in blood serum over the range of clinical interest (1−60 μg/dL) without the need for extraction or other sample preparation steps. The separation is performed in less than 30 s. Very high throughput is possible by operating the assay in multiple channels in parallel. These characteristics make microchip electrophoretic systems a promising technology for the rapid analysis of clinical samples.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac9508311