Human Alpha 1-Antitrypsin ELISA


The Human Alpha 1-Antitrypsin ELISA Assay Kit is a highly sensitive two-site enzyme linked immunoassay (ELISA) for measuring A1AT in biological fluid of humans.

SKU: HAP39-K01 Categories: , ,

Human Alpha 1-Antitrypsin ELISA

The Human Alpha 1-Antitrypsin ELISA is For Research Use Only

Size: 1×96 wells
Sensitivity: 1.094 ng/ml
Standard Range: 7.81 – 500 ng/ml
Incubation Time: 100 minutes
Sample Type: Human Biological Fluids
Sample Size: 100 µl
Alternative Name:A1AT

Assay Principle

The principle of the double antibody sandwich ELISA is represented in Figure 1. In this assay the Alpha 1-Antitrypsin present in samples reacts with the anti-Alpha 1-Antitrypsin antibodies which have been adsorbed to the surface of polystyrene microtitre wells. After the removal of unbound proteins by washing, anti-A1AT antibodies conjugated with horseradish peroxidase (HRP), are added. These enzyme-labeled antibodies form complexes with the previously bound A1AT. Following another washing step, the enzyme bound to the immunosorbent is assayed by the addition of a chromogenic substrate, 3,3’,5,5’-tetramethylbenzidine (TMB). The quantity of bound enzyme varies directly with the concentration of A1AT in the sample tested; thus, the absorbance, at 450 nm, is a measure of the concentration of A1AT in the test sample. The quantity of A1AT in the test sample can be interpolated from the standard curve constructed from the standards, and corrected for sample dilution.

Specimen Collection and Handling
Blood should be collected by venipuncture. The serum should be separated from the cells after clot formation by centrifugation. For plasma samples, blood should be collected into a container with an anticoagulant and then centrifuged. Care should be taken to minimize hemolysis, excessive hemolysis can impact your results. Assay immediately or aliquot and store samples at -20°C. Avoid repeated freeze-thaw cycles.

Related Products

Human Alpha 2-Macroglobulin ELISA Kit
Human Alpha 1-Microglobulin ELISA
Human Alpha 1-Antichymotrypsin ELISA Assay

Additional Information

Assay Background

Alpha 1-Antitrypsin is a 52 kDA serine protease inhibitor (serpin) in blood, which protects tissue from enzymes from inflammatory cells, especially elastase. In certain acute phase inflammatory reactions, A1AT is elevated in order to limit the damage caused by activated neutrophil granulocytes and their enzyme elastase. Disorders of A1AT include A1AT deficiency, a hereditary disorder that can lead to severe tissue breakdown during inflammation. This may result in pulmonary emphysema and liver cirrhosis, in severe cases. Genetic variants of A1AT do occur.

Typical Standard Curve


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