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Human sVEGFR2(Souble Vascular Endothelial Growth Factor Receptor 2) ELISA Kit
ELK9333
Size： Price：
48 T $320.00
96 T $458.00
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Overview

Product name: Human sVEGFR2(Souble Vascular Endothelial Growth Factor Receptor 2) ELISA Kit
Reactivity: Human
Alternative Names: sCD309; FLK1; VEGFR; KDR; A Type III Receptor Tyrosine Kinase; Kinase Insert Domain Receptor; Kinase Insert Domain Receptor; Fetal Liver Kinase-1
Assay Type: Sandwich
Sensitivity: 2.6 pg/mL
Standard: 500 pg/mL
Detection Range: 7.82-500 pg/mL
Sample Type: Serum, plasma, tissue homogenates and other biological fluids
Assay Length: 3.5h
Research Area: Signal transduction;CD & Adhesion molecule;Tumor immunity;
Test principle: The test principle applied in this kit is Sandwich enzyme immunoassay. The microtiter plate provided in this kit has been pre-coated with an antibody specific to Human sVEGFR2. Standards or samples are added to the appropriate microtiter plate wells then with a biotin-conjugated antibody specific to Human sVEGFR2. Next, Avidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. After TMB substrate solution is added, only those wells that contain Human sVEGFR2, biotin-conjugated antibody and enzyme-conjugated Avidin will exhibit a change in color. The enzyme-substrate reaction is terminated by the addition of sulphuric acid solution and the color change is measured spectrophotometrically at a wavelength of 450nm ± 10nm. The concentration of Human sVEGFR2 in the samples is then determined by comparing the OD of the samples to the standard curve.

Standard curve

Concentration (pg/mL) OD Corrected OD
500.00 2.131 2.046
250.00 1.703 1.618
125.00 1.135 1.050
62.50 0.864 0.779
31.25 0.541 0.456
15.63 0.353 0.268
7.82 0.236 0.151
0.00 0.085 0.000

Precision

Intra-assay Precision (Precision within an assay)：CV%<8%

Three samples of known concentration were tested twenty times on one plate to assess intra-assay precision.

Inter-assay Precision (Precision between assays)：CV%<10%

Three samples of known concentration were tested in forty separate assays to assess inter-assay precision.

Recovery

Matrices listed below were spiked with certain level of recombinant sVEGFR2 and the recovery rates were calculated by comparing the measured value to the expected amount of sVEGFR2 in samples.
Matrix Recovery range Average
serum(n=5) 87-95% 91%
EDTA plasma(n=5) 77-95% 86%
Heparin plasma(n=5) 84-106% 100%

Linearity

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of sVEGFR2 and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected.
Matrix 1:2 1:4 1:8 1:16
serum(n=5) 95-106% 87-101% 87-96% 93-108%
EDTA plasma(n=5) 80-101% 87-96% 88-96% 81-95%
Heparin plasma(n=5) 89-97% 95-106% 85-101% 87-102%