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ELISA Kit for Vascular Endothelial Growth Factor 121 (VEGF121)

Specificity

This assay has high sensitivity and excellent specificity for detection of Vascular Endothelial Growth Factor 121 (VEGF121).
No significant cross-reactivity or interference between Vascular Endothelial Growth Factor 121 (VEGF121) and analogues was observed.

Recovery

Matrices listed below were spiked with certain level of recombinant Vascular Endothelial Growth Factor 121 (VEGF121) and the recovery rates were calculated by comparing the measured value to the expected amount of Vascular Endothelial Growth Factor 121 (VEGF121) in samples.

Matrix Recovery range (%) Average(%)
serum(n=5) 85-102 98
EDTA plasma(n=5) 78-91 82
heparin plasma(n=5) 96-105 99

Precision

Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level Vascular Endothelial Growth Factor 121 (VEGF121) were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level Vascular Endothelial Growth Factor 121 (VEGF121) were tested on 3 different plates, 8 replicates in each plate.
CV(%) = SD/meanX100
Intra-Assay: CV<10%
Inter-Assay: CV<12%

Linearity

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Vascular Endothelial Growth Factor 121 (VEGF121) and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected.

Sample 1:2 1:4 1:8 1:16
serum(n=5) 92-99% 82-103% 83-101% 81-102%
EDTA plasma(n=5) 80-88% 99-105% 79-101% 87-101%
heparin plasma(n=5) 88-101% 98-105% 91-98% 83-97%

Stability

The stability of kit is determined by the loss rate of activity. The loss rate of this kit is less than 5% within the expiration date under appropriate storage condition.
To minimize extra influence on the performance, operation procedures and lab conditions, especially room temperature, air humidity, incubator temperature should be strictly controlled. It is also strongly suggested that the whole assay is performed by the same operator from the beginning to the end.

Reagents and materials provided

Reagents Quantity Reagents Quantity
Pre-coated, ready to use 96-well strip plate 1 Plate sealer for 96 wells 4
Standard 2 Standard Diluent 1×20mL
Detection Reagent A 1×120µL Assay Diluent A 1×12mL
Detection Reagent B 1×120µL Assay Diluent B 1×12mL
TMB Substrate 1×9mL Stop Solution 1×6mL
Wash Buffer (30 × concentrate) 1×20mL Instruction manual 1

Assay procedure summary

1. Prepare all reagents, samples and standards;
2. Add 100µL standard or sample to each well. Incubate 1 hours at 37°C;
3. Aspirate and add 100µL prepared Detection Reagent A. Incubate 1 hour at 37°C;
4. Aspirate and wash 3 times;
5. Add 100µL prepared Detection Reagent B. Incubate 30 minutes at 37°C;
6. Aspirate and wash 5 times;
7. Add 90µL Substrate Solution. Incubate 10-20 minutes at 37°C;
8. Add 50µL Stop Solution. Read at 450nm immediately.

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Magazine Citations
Oncogene Elevated PLGF contributes to small-cell lung cancer brain metastasis PubMed: 22797069
BMC Cancer VEGF-121 plasma level as biomarker for response to anti-angiogenetic therapy in recurrent glioblastoma Pubmed:29747600
JOURNAL OF CLINICAL NEUROSCIENCE A pediatric case of anaplastic astrocytoma with a gliomatosis cerebri; the growth pattern and changes in serum VEGF-121 levels after bevacizumab treatment Pubmed: 33222957
INTERNATIONAL JOURNAL OF DEVELOPMENTAL NEUROSCIENCE Associations between VEGF isoforms and impending retinopathy of prematurity Pubmed: 32737903
international journal of oncology Activin A triggers angiogenesis via regulation of VEGFA and its overexpression is associated with poor prognosis of oral squamous cell carcinoma Pubmed: 32377747
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