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Human C4d(Complement Component 4d) ELISA Kit
ELK6431
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48 T $320.00
96 T $458.00
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Overview

Product name: Human C4d(Complement Component 4d) ELISA Kit
Reactivity: Human
Alternative Names: C4d
Assay Type: Sandwich
Sensitivity: 0.96 ng/mL
Standard: 140 ng/mL
Detection Range: 2.19-140 ng/mL
Sample Type: serum, plasma and other biological fluids
Assay Length: 3.5h
Research Area: Signal transduction;Infection immunity;Hematology;
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 C4d. Standards or samples are added to the appropriate microtiter plate wells then with a biotin-conjugated antibody specific to Human C4d. 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 C4d, 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 C4d in the samples is then determined by comparing the OD of the samples to the standard curve.

Standard curve

Concentration (ng/mL) OD Corrected OD
140.00 2.268 2.173
70.00 1.562 1.467
35.00 1.174 1.079
17.50 0.726 0.631
8.75 0.591 0.496
4.38 0.368 0.273
2.19 0.129 0.034
0.00 0.095 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 C4d and the recovery rates were calculated by comparing the measured value to the expected amount of C4d in samples.
Matrix Recovery range Average
serum(n=5) 92-105% 98%
EDTA plasma(n=5) 95-105% 100%
Heparin plasma(n=5) 80-95% 87%

Linearity

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of C4d 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) 81-97% 88-102% 85-93% 83-97%
EDTA plasma(n=5) 95-104% 87-96% 89-101% 97-105%
Heparin plasma(n=5) 85-92% 88-96% 87-98% 95-102%