Clinical Chemistry
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Clinical Chemistry 33: 1543-1547, 1987;
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Clinical Chemistry, Vol 33, 1543-1547, Copyright © 1987 by American Association for Clinical Chemistry

Application of novel chromium dioxide magnetic particles to immunoassay development

RC Birkmeyer, R Diaco, DK Hutson, HP Lau, WK Miller, NV Neelkantan, TJ Pankratz, SY Tseng, DK Vickery and EK Yang

We have used chromium dioxide magnetic particles as the solid support in developing a series of immunological tests. The high surface area (greater than 40 m2/g) available on the magnetic particles and their easy dispersion throughout a solution allow for rapid and complete capture of the target antigen. The magnetic responsiveness of the particles allows for rapid, high-efficiency washing to reduce nonspecific binding, which often limits the sensitivity of serological assays. These features form the basis of extremely rapid and flexible assays for several hormones and markers of cancer and infectious disease. Most of the assays involve monoclonal antibodies. Here we describe specific performance characteristics for thyroxin, follitropin, creatine kinase isoenzyme MB, and antibody to human immunodeficiency virus (HIV). All of the assays are performed in less than 90 min, many in 30 to 45 min. The technology is highly flexible and is suitable for a variety of formats, from manual to fully automated.


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D. J. Newman, Y. Olabiran, W. D. Bedzyk, S. Chance, E. G. Gorman, and C. P. Price
Impact of Antibody Specificity and Calibration Material on the Measure of Agreement between Methods for Cardiac Troponin I
Clin. Chem., June 1, 1999; 45(6): 822 - 828.
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Copyright © 1987 by the American Association for Clinical Chemistry.