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QuicKey Human VEGF-A(Vascular Endothelial Growth Factor A) ELISA Kit

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Price:   $390
Cat Number:  E-TSEL-H0026
Lead Time:   7~10 days

Reactivity:  Human

Detection Range:  0.04~10 ng/mL

Sensitivity:  0.03 ng/mL

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Product Details

QuicKey Series

Get more sensitive and precise results with saving at least 1h comparing to traditional ELISA Kits. The new developed technology in house will help to accelerate your science research in a more efficient way.


Assay type Sandwich-ELISA
Format 96T/48T
Assay time 2.5 h
Reactivity Human
Detection method Colormetric
Colormetric 0.04-10 ng/mL
Sensitivity 0.03 ng/mL
Sample volume 50μL/well
Sample type serum, plasma
Specificity This kit recognizes Human VEGF-A in samples. No significant cross-reactivity or interference between Human VEGF-A and analogues was observed.
Reproducibility Both intra-CV and inter-CV are < 10%.
Application This ELISA kit applies to the in vitro quantitative determination of Human VEGF-A concentrations in serum, plasma. Please consult technical support for the applicability if other biological fluids need to be tested.

Test principle

This ELISA kit uses the Sandwich-ELISA principle. The micro ELISA plate provided in this kit has been pre-coated with an antibody specific to Human VEGF-A. Samples (or Standards) and biotinylated detection antibody specific for Human VEGF-A are added to the micro ELISA plate wells. Human VEGF-A would combine with the specific antibody. Then Avidin-Horseradish Peroxidase (HRP) conjugate are added successively to each micro plate well and incubated. Free components are washed away. The substrate solution is added to each well. Only those wells that contain Human VEGF-A, biotinylated detection antibody and Avidin-HRP conjugate will appear blue in color. The enzyme-substrate reaction is terminated by the addition of stop solution and the color turns yellow. The optical density (OD) is measured spectrophotometrically at a wavelength of 450 ± 2 nm. The OD value is proportional to the concentration of Human VEGF-A. You can calculate the concentration of Human VEGF-A in the samples by comparing the OD of the samples to the standard curve.

Kit components & Storage

An unopened kit can be stored at 2-8℃ for six months. After test, the unused wells and reagents should be stored according to the table below. (The specific components might be slightly different in delivered kits, please refer to the manual for more information.)

Item Specifications Storage conditions after test
Micro ELISA Plate (Dismountable) 96T: 8 wells ×12 strips
48T: 8 wells ×6 strips
2-8℃, 1 month
Reference Standard 96T: 2 vials
48T: 1 vial
Discard unused reconstituted standard and dilutions
Reference Standard & Sample Diluent 1 vial, 20 mL 2-8℃
Biotinylated Detection Ab Working Solution 1 vial, 6 mL
HRP Conjugate Diluent 1 vial, 14 mL
Concentrated Wash Buffer (25×) 1 vial, 30 mL
Concentrated HRP Conjugate (100×) 96T: 1 vial, 120 μL
48T: 1 vial, 60 μL
2-8℃ (Protect from light)
Substrate Reagent 1 vial, 10 mL
Stop Solution 1 vial, 10 mL 2-8℃
Plate Sealer 5 pieces
Product Description 1 copy
Certificate of Analysis 1 copy

Note: All reagent bottle caps must be tightened to prevent evaporation and microbial pollution. The volume of reagents in partial shipments is a little more than the volume marked on the label, please use accurate measuring equipment instead of directly pouring into the vial(s).

Other supplies required

1. Microplate reader with 450nm wavelength filter

2. High-precision transfer pipette, EP tubes and disposable pipette tips

3. Incubator capable of maintaining 37℃

4. Deionized or distilled water

5. Absorbent paper

6. Loading slot for Wash Buffer

Technical Data

Sample values


Typical Standard Curve

As the OD values of the standard curve may vary according to the conditions of the actual assay performance (e.g. operator, pipetting technique, washing technique or temperature effects), the operator should establish a standard curve for each test. Typical standard curve and data is provided below for reference only.

Concentration(ng/mL) 10 3.33 1.11 0.37 0.12 0.04 0
OD 2.2435 1.3365 0.602 0.2615 0.1355 0.0915 0.0765
Corrected OD 2.167 1.26 0.525 0.185 0.059 0.015 -


Intra-assay Precision (Precision within an assay): 3 samples with low, mid range and high level Human VEGF-A were tested 20 times on one plate, respectively.

Inter-assay Precision (Precision between assays): 3 samples with low, mid range and high level Human VEGF-A were tested on 3 different plates, 20 replicates in each plate.

Intra-assay Precision Inter-assay Precision
Sample 1 2 3 1 2 3
n 20 20 20 20 20 20
Mean(ng/mL) 0.48 1.13 4.28 0.42 1.19 4.51
Standard deviation 0.03 0.05 0.21 0.02 0.06 0.22
CV (%) 6.25 4.42 4.91 4.76 5.04 4.88


The recovery of Human VEGF-A spiked at three different levels in samples throughout the range of the assay was evaluated in various matrices.

Sample Type Range (%) Average Recovery (%)
Serum(n=8) 86-97 91
EDTA plasma(n=8) 82-96 90


Samples were spiked with high concentrations of Human VEGF-A and diluted with Reference Standard & Sample Diluent to produce samples with values within the range of the assay.

Serum(n=4) EDTA plasma (n=4)
1:2 Range (%) 97-110 98-104
Average (%) 103 101
1:4 Range (%) 97-110 84-94
Average (%) 104 90
1:8 Range (%) 88-101 97-108
Average (%) 93 105
1:16 Range (%) 86-95 101-108
Average (%) 92 104

Target information


Vascular endothelial growth factor A(VEGF-A) is a multifunctional cytokine that exerts in vivo a key role in physiological and pathological neoangiogenesis by stimulating endothelial cell proliferation and vessel hyperpermeability.[1] It is a member of the platelet-derived growth factor (PDGF)/vascular endothelial growth factor (VEGF) family and encodes a protein that is often found as a disulfide linked homodimer. In human, VEGF-A is produced by a group of isoforms as a result of alternative splicing and VEGF189, VEGF165, VEGF121 are widely expressed. Elevated levels of this protein is linked to POEMS syndrome, mutations in this gene have been associated with proliferative and nonproliferative diabetic retinopathy.[2] VEGF-A also has a major role in the pathogenesis of many other diseases including hypervascularized tumors, rheumatoid arthritis, cutaneous diseases. [3]
1. Murphy J F , Fitzgerald D J . Vascular endothelial growth factor induces cyclooxygenase-dependent proliferation of endothelial cells via the VEGF-2 receptor[J]. The FASEB Journal, 2001, 15(9):1667-1669.
2. Watanabe D, Suzuma K, Suzuma I, et al. Vitreous levels of angiopoietin 2 and vascular endothelial growth factor in patients with proliferative diabetic retinopathy[J]. American journal of ophthalmology, 2005, 139(3): 476-481.
3. Dixelius J , Olsson A K , Thulin A , et al. Minimal Active Domain and Mechanism of Action of the Angiogenesis Inhibitor Histidine-Rich Glycoprotein[J]. Cancer Research, 2006, 66(4):2089-2097.

Research area

Database Links

SwissProt P15692 Human
Entrez Gene 7422 Human





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Assay procedures

1. Add 50μL standard or sample to the wells, immediately add 50μL Biotinylated Detection Ab working solution to each well. Incubate for 90 min at 37°C
2. Aspirate and wash the plate for 3 times
3. Add 100μL HRP conjugate working solution. Incubate for 30 min at 37°C. Aspirate and wash the plate for 5 times
4. Add 90μL Substrate Reagent. Incubate for 15 min at 37°C
5. Add 50μL Stop Solution
6. Read the plate at 450nm immediately. Calculation of the results
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