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Human NT-ProBNP(N-Terminal Pro-Brain Natriuretic Peptide) ELISA Kit
ELK1212
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48 T $265.00
96 T $376.00
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Overview

Product name: Human NT-ProBNP(N-Terminal Pro-Brain Natriuretic Peptide) ELISA Kit
Reactivity: Human
Alternative Names: NT-Pro-BNP; ; N-BNP; ANFB_HUMAN; BNP(1-32); BNP(5-29); BNP-32; Gamma-brain natriuretic peptide; nppb
Assay Type: Sandwich
Sensitivity: 15 pg/mL
Standard: 2500 pg/mL
Detection Range: 39.07-2500 pg/mL
Sample Type: serum, plasma, tissue homogenates, cell lysates, cell culture supernates and other biological fluids
Assay Length: 3.5h
Research Area: Endocrinology;Cardiovascular biology;
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 NT-ProBNP. Standards or samples are added to the appropriate microtiter plate wells then with a biotin-conjugated antibody specific to Human NT-ProBNP. 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 NT-ProBNP, 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 NT-ProBNP 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
2500.00 2.037 1.951
1250.00 1.572 1.486
625.00 1.216 1.130
312.50 0.921 0.835
156.25 0.563 0.477
78.13 0.403 0.317
39.07 0.256 0.170
0.00 0.086 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 NT-ProBNP and the recovery rates were calculated by comparing the measured value to the expected amount of NT-ProBNP in samples.
Matrix Recovery range Average
serum(n=5) 90-103% 96%
EDTA plasma(n=5) 81-96% 88%
Heparin plasma(n=5) 78-94% 86%

Linearity

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of NT-ProBNP 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) 82-94% 95-102% 87-103% 88-95%
EDTA plasma(n=5) 98-107% 90-99% 88-97% 85-97%
Heparin plasma(n=5) 81-94% 87-105% 79-95% 96-105%