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Clinical Chemistry 39: 1659-1661, 1993;
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Clinical Chemistry, Vol 39, 1659-1661, Copyright © 1993 by American Association for Clinical Chemistry

Space-resolved fluoroimmunoassay for quantifying alpha-fetoprotein in serum

WK Wang, LT Ho and Y Chiang
Biophysics Laboratory, Academia Sinica, Taipei, Taiwan, Republic of China.

A nickel-coated surface was used to adsorb a monolayer of anti-human alpha-fetoprotein antibody. After incubation with a patient's serum, the sample was stained with fluorescein isothiocyanate (FITC)- conjugated anti-human alpha-fetoprotein antibody. These slides were then read with a space-resolved fluorometer to determine the amount of FITC adsorbed onto the metal surface. We used an argon laser as the light source in the fluorometer. The parallel laser beam was tilted at about 45 degrees to the sample surface. The fluorescence from FITC was read with a perpendicular photon counter to reduce noise. The CV for these tests was approximately 10%. Comparison of these results (y) with those of a conventional radioimmunoassay (x) produced the regression equation y = 0.99x + 0.5, over the range 10-140 micrograms/L (n = 51).




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Copyright © 1993 by the American Association for Clinical Chemistry.