Enzyme-immunoassay for carcinoembryonic antigen
First Claim
1. In a solid phase-sandwich method for the rapid determination of carcino-embryonic antigen (CEA) which comprises incubating a sample to be investigated with a first CEA antibody, which is bound to or becomes bound to a water-insoluble carrier, and a second CEA antibody, to which peroxidase is bound directly or via a biotin/avidin bridge, separating the solid and liquid phase and measuring of the peroxidase activity either in the solid or in the liquid phase as the amount of CEA present, wherein the improvement comprises carrying out the incubation in the presence of 0.4-1.0 mol/l of phosphate ions, of 0.2-0.4 mol/l of sulfate ions or of 0.2-0.4 mol/l of tartrate ions.
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Accused Products
Abstract
A solid phase-sandwich enzyme-immunoassay method for the rapid determination of carcinoembryonic antigen (CEA). The sample to be investigated is incubated with a first CEA antibody, which is bound to a water-insoluble carrier, and a second CEA antibody, to which peroxidase is bound directly or via a biotin/avidin bridge. The immunological reaction can be carried out in one or two steps. By the presence of 0.4-1.0 mol/l of phosphate ions, 0.3-0.4 mol/l of sulfate ions or 0.2-0.4 mol/l of tartrate ions in the immunological reaction or in the second step thereof (insofar as it is carried out in two steps) the incubation time period is shortened considerably. After the immunological reaction, the phases are separated, whereupon the peroxidase activity is measured either in the solid or in the liquid phase as the amount of CEA present in the sample.
22 Citations
16 Claims
- 1. In a solid phase-sandwich method for the rapid determination of carcino-embryonic antigen (CEA) which comprises incubating a sample to be investigated with a first CEA antibody, which is bound to or becomes bound to a water-insoluble carrier, and a second CEA antibody, to which peroxidase is bound directly or via a biotin/avidin bridge, separating the solid and liquid phase and measuring of the peroxidase activity either in the solid or in the liquid phase as the amount of CEA present, wherein the improvement comprises carrying out the incubation in the presence of 0.4-1.0 mol/l of phosphate ions, of 0.2-0.4 mol/l of sulfate ions or of 0.2-0.4 mol/l of tartrate ions.
- 9. CEA antibody, to which peroxidase is coupled directly or via a biotin/avidin bridge, in an aqueous solution of pH 4-9, wherein the solution contains 0.4-1.0 mol/l of phosphate ions, 0.2-0.4 mol/l of sulfate ions or 0.2-0.4 mol/l of tartrate ions.
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11. A test kit for determining carcinoembryonic antigen (CEA) in a sample, comprising:
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(a) a first CEA antibody which is bound to water-insoluble carrier; (b) a second CEA antibody labeled with peroxidase wherein the peroxidase is bound directly or via a biotin/avidin bridge; (c) an aqueous solution of pH 4-9 comprising 0.4-1.0 mol/l of phosphate ions, 0.2-0.4 mol/l of sulfate ions or 0.2-0.4 mol/l of tartrate ions. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification