Heterogeneous enzyme immunoassay of alpha-fetoprotein in maternal serum by flow-injection amperometric detection of 4-aminophenol.
A sandwich-type heterogeneous enzyme immunoassay with flow-injection analysis for alpha-fetoprotein (AFP) in human serum has been developed. 4-Aminophenol, the product of enzymatic reaction, is detected amperometrically. The interassay CV for this electrochemical enzyme immunoassay was less than 8.2%, with a minimum detection limit for AFP of 0.163 micrograms/L. The calibration curve had a linear range of 0.316-100 micrograms/L. Studies with 48 human maternal serum samples, comparing results by this method with those by a commercial kit, showed a good correlation (r = 0.961). This procedure provides an alternative method for determining low concentrations of AFP in human maternal serum.
Xu
Y
Y
Department of Chemistry, University of Cincinnati, OH 45221-0172.
Halsall
B
B
Heineman
W R
WR
D000627:Aminophenols / Q000097:blood*; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D011247:Pregnancy; D000509:alpha-Fetoproteins / Q000032:analysis*
D000627:Aminophenols; D000509:alpha-Fetoproteins; C026729:4-aminophenol