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ELK Biotechnology

ELK9706

Rat CREB(Cyclic AMP Response Element Binding Protein) ELISA Kit

Rat CREB(Cyclic AMP Response Element Binding Protein) ELISA Kit

Sensitivity

Rat CREB(Cyclic AMP Response Element Binding Protein) ELISA Kit

Overview

Product name: Rat CREB(Cyclic AMP Response Element Binding Protein) ELISA Kit
Reactivity: Rat
Alternative Names: CREB; active transcription factor CREB; cAMP responsive element binding protein 1; cAMP-response element-binding protein-1; cAMP-responsive element-binding protein 1; CREB-1; cyclic AMP-responsive element-binding protein 1; MGC9284; transactivator protein
Assay Type: Sandwich
Sensitivity: 0.132 ng/mL
Standard: 20 ng/mL
Detection Range: 0.32-20 ng/mL
Sample Type: Tissue homogenates and other biological fluids.
Assay Length: 3.5h
Research Area: Epigenetics and Nuclear Signaling; Immunology; Neuroscience
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 Rat CREB. Standards or samples are added to the appropriate microtiter plate wells then with a biotin-conjugated antibody specific to Rat CREB. 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 Rat CREB, 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 Rat CREB 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
20.00 2.126 2.058
10.00 1.593 1.525
5.00 1.185 1.117
2.50 0.826 0.758
1.25 0.572 0.504
0.63 0.386 0.318
0.32 0.225 0.157
0.00 0.068 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 CREB and the recovery rates were calculated by comparing the measured value to the expected amount of CREB in samples.
Matrix Recovery range Average
serum(n=5) 88-106% 97%
EDTA plasma(n=5) 81-95% 88%
Heparin plasma(n=5) 86-99% 92%

Linearity

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of CREB 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) 85-101% 87-102% 89-95% 95-102%
EDTA plasma(n=5) 93-101% 81-89% 95-103% 90-99%
Heparin plasma(n=5) 87-95% 89-97% 93-104% 87-96%
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