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Clinical Chemistry 31: 54-59, 1985;
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Clinical Chemistry, Vol 31, 54-59, Copyright © 1985 by American Association for Clinical Chemistry

Highly sensitive solid-phase immunoenzymometric assay for placental and placental-like alkaline phosphatases with a monoclonal antibody and monodisperse polymer particles

JL Millan, K Nustad and B Norgaard-Pedersen

We have used a mouse monoclonal antibody (H7) to placental alkaline phosphatase (PLAP, EC 3.1.3.1) in developing an immunoenzymometric assay for PLAP and PLAP-like enzymes. The antibody is bound to sheep anti-mouse IgG (Ab2) covalently coupled to tosylated shell-and-core light (1.07 g/cm3) monodisperse polymer particles. Adding the H7-Ab2- polymer particle suspension to a PLAP-containing sample gives maximal binding of the antigen within 10 min. PLAP and PLAP-like enzymes remain active and bound to the solid-phase throughout all assay manipulations, and can thus be saved for future testing. In testing the enzymes for inhibition by L-Phe, L-Phe-Gly-Gly, L-Leu, and L-homoarginine, the effect of all the inhibitors is fully reversible. The assay is highly versatile, and its sensitivity (routinely 0.05 micrograms/L) can be increased 1000-fold by adjusting the sample volume and incubation time (sample volume is irrelevant between 50 microL and 5 mL). We have measured the basal activities of PLAP in men and women and, by using enzyme inhibitors, have characterized it as corresponding to the PLAP- like phenotypes described in normal human testis.


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Multiplexed Analysis of Human Cytokines by Use of the FlowMetrix System
Clin. Chem., September 1, 1998; 44(9): 2057 - 2060.
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