COATED PLATE ASSAYS
The MicroBeta is and ideal instrument for the counting of radioimmunoassays based on coated microtitration plates. The following method describes a typical assay protocol for a TSH assay. The data presented compare the standard immunoassay microtitration plates with those manufactured by PerkinElmer Life Sciences.
The basic assay procedure is straightforward:
(1) Coat the wells according to the standard method described* or use commercially coated plates.
(2) Carry out the immunoassay procedure as described** - eg react the antigen to the coated antibody.
(3) Add Optiphase HiSafe II into each well and place on a plateshaker for 5 minutes (or if the plate is dried, add Meltilex using the Meltipipette 1495-034/035, and heat in oven until liquified. Allow to reset and count).
(4) Place into the MicroBeta cassette (1450- 105) and count in the MicroBeta (remember to correct for crosstalk prior to counting the sample plates).
(5) Collect and analyze the data with MultiCalc.
As a comparison two other commercially available plates (Labsystems-Polysorp and Nunc-Maxisorp) were also assayed in parallel to the Wallac (1450-401) plate to show any observable differences in plate performance.
The graphs (Fig.1) clearly illustrate that the MicroBeta can be used in clinical chemistry laboratories, the sensitivity required for this assay can be obtained by the MicroBeta. Additionally there appears to be little difference between using the Wallac plate to using specially surface treated plates from other companies.
1. Coating Buffer formulation:
50 mM carbonate buffer, pH 9.6
22.5 mM Na2CO3
27.5 mM NaHCO3