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E1S(Estrone Sulfate) ELISA Kit
ELK7928
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48 T $265.00
96 T $376.00
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Overview

Product name: E1S(Estrone Sulfate) ELISA Kit
Reactivity: General
Alternative Names: E1S
Assay Type: Competitive Inhibition
Sensitivity: 0.51 ng/mL
Standard: 100 ng/mL
Detection Range: 1.57-100 ng/mL
Sample Type: Serum, plasma and other biological fluids.
Assay Length: 2h
Research Area: Reproductive science;
Test principle: This assay employs the competitive inhibition enzyme immunoassay technique. The microtiter plate provided in this kit has been pre-coated with E1S protein. Standards or samples are added to the appropriate microtiter plate wells then with a biotin-conjugated antibody specific to E1S. Next, Avidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. After TMB substrate solution is added. 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 E1S 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
100.00 0.232
50.00 0.397
25.00 0.689
12.50 0.856
6.25 1.139
3.13 1.596
1.57 1.799
0.00 2.325

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 E1S and the recovery rates were calculated by comparing the measured value to the expected amount of E1S in samples.
Matrix Recovery range Average
serum(n=5) 85-97% 91%
EDTA plasma(n=5) 97-105% 101%
Heparin plasma(n=5) 83-99% 90%

Linearity

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of E1S 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) 87-98% 85-92% 87-101% 89-99%
EDTA plasma(n=5) 88-104% 84-98% 95-105% 88-102%
Heparin plasma(n=5) 89-99% 79-96% 89-101% 85-97%