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The kinetics and efficiency of the interaction between placental alkaline phosphatase and a monoclonal antibody (laboratory number 327) were determined by immunoassay using microtitre plates or magnetic beads. While only up to 45% of placental alkaline phosphatase was bound to microwells precoated with this antibody, even after prolonged incubation, no less than 60% and 100% binding were reached using magnetic beads after 1 and 3 h incubations, respectively. High-molecular-mass placental alkaline phosphatase and complexed placental alkaline phosphatase forms were also completely bound to magnetic beads in the presence of deoxycholate (up to 9 g/l for serum samples). The assay sensitivity was improved up to 4-fold. In addition, 100% binding of the antigen was achieved during simultaneous incubation of magnetic beads, monoclonal antibody (125 micrograms/l), and placental alkaline phosphatase. This one-step enzymatic assay, based on magnetic beads, is an attractive alternative to the classic assay performed in microtitre plates, enabling rapid, precise, and sensitive antigen detection, and only necessitating a minimum of laboratory equipment.

Magnetic Beads in Suspension. Enable a Rapid and Sensitive Immunodetection of Human Placental Alkaline Phosphatase