Thomas Hall Frame

US Patent:

59050284, May 18, 1999

Filed:

Oct 11, 1996

Appl. No.:

8/728751

Inventors:

Thomas H. Frame - Spring TX
David E. Hatcher - Houston TX
John J. Moulds - Houston TX

Assignee:

Gamma Biologicals, Inc. - Houston TX

International Classification:

G01N33/537;33/546;33/548;33/558

US Classification:

435 725

Abstract:

The present invention is a method useful for the detection of bloodgroup antigens and antibodies. The method of the present invention is envisioned for two types of assays: a direct assay and an indirect assay. The direct assay comprises adding a sample of erythrocytes to a reaction tube charged with two layers of immunoreactive particles, a first layer, preferably Sepharose, having Protein G coupled to the surface of those particles and a second layer, preferably Sephacryl S-200, having Protein A coupled to those particles in a buffer solution. Antibodies specific for the bloodgroup antigens tested for are coupled to the Protein G. The reaction tube is then centrifuged for a time sufficient to force to the bottom of the reaction tube erythrocytes that do not attach to the antibodies. The indirect assay comprises obtaining samples of erythrocytes, blood serum or blood plasma to be tested and mixing the erythrocytes, serum, or plasma with a known antibody or antigen reagent, depending on whether antigens or antibodies are being tested for. The mixture is incubated in a reaction tube above two layers of immunoreactive particles, a first layer, preferably Sepharose, having Protein G coupled to the surface of those particles and a second layer, preferably Sephacryl S-200, having Protein A coupled to those particles in a buffer solution.

US Patent:

56655584, Sep 9, 1997

Filed:

May 17, 1994

Appl. No.:

8/243296

Inventors:

Thomas H. Frame - Spring TX
David E. Hatcher - Houston TX
John J. Moulds - Houston TX

Assignee:

Gamma Biologicals, Inc. - Houston TX

International Classification:

G01N 33538
G01N 33546
G01N 33558
G01N 33566

US Classification:

435 725

Abstract:

The present invention is a method and apparatus useful for the detection of bloodgroup antigens and antibodies. There are two preferred embodiments of the method: a direct assay and an indirect assay. The direct assay comprises adding a sample of erythrocytes to a reaction tube charged with a column of immunoreactive particles having an immunoglobulin binding ligand selected from the group consisting of Protein A, Protein G, Protein A/G or a universal kappa light chain binding protein coupled to the surface of the particles. Antibodies specific for bloodgroup antigens tested for are coupled to the ligand on the particles. The reaction tube is then centrifuged for a time sufficient to force to the bottom of the reaction tube erythrocytes that do not attach to the antibodies on the particles. The indirect assay comprises obtaining either a sample of erythrocytes or a sample of blood serum to be tested and mixing the erythrocytes or serum with a known antibody or antigen reagent, depending on whether antigens or antibodies are being tested for. The mixture is incubated in a reaction tube above a column of immunoreactive particles having immunoglobulin binding ligands selected from the group consisting of Protein A, Protein G, Protein A/G or a universal kappa light chain binding protein coupled to the surface of the particles.