Available with Lead Time!
Sample Type (Matrix): EDTA Plasma, Serum
Sample Volume: 25 µl
Incubation time: 2h 40m
Standard Range: 3-600 µmol/l
Size: 96 wells
Regulatory Status: For research use only in the U.S.
Kit Manual: Download
The Tyrosine ELISA is intended for the quantitative determination of L-tyrosine in human EDTA plasma and serum.
For research use only. Not for use in diagnostic procedures.
For Laboratory Professional Use Only.
Test Principle of the Tyrosine ELISA
The Tyrosine ELISA is based on the method of competitive enzyme-linked immunoassays.
The sample preparation includes the addition of a derivatization reagent for L-tyrosine derivatization. Afterward, the treated samples and a polyclonal L-tyrosine antiserum are incubated in wells of a microtiter plate coated with L-tyrosine-derivative (tracer). During the incubation period, the target L-tyrosine in the sample competes with the tracer, immobilized on the wall of the microtiter wells, to bind the polyclonal antibodies. The L-tyrosine in the sample displaces the antibodies out of the binding to the tracer.
During the second incubation step, a peroxidase conjugate is added to each microtiter well to detect the anti-L-tyrosine antibodies. After washing away the unbound components, tetramethylbenzidine is added as a peroxidase substrate.
Finally, the enzymatic reaction is terminated by an acidic stop solution. The color changes from blue to yellow, and the absorbance is measured in a photometer at 450 nm. The intensity of the yellow color is inversely proportional to the L-tyrosine concentration in the sample; this means a high L-tyrosine concentration in the sample reduces the concentration of tracer-bound antibodies and lowers the photometric signal.
A dose-response curve of absorbance unit (optical density, OD at 450 nm) vs. concentration is generated using the values obtained from the standards. L-tyrosine, present in the patient samples, is determined directly from this curve.
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