ELISA Kit for C1q And Tumor Necrosis Factor Related Protein 9 (C1QTNF9)

CTRP9; C1QTNF9A; AQL1; Complement C1q and tumor necrosis factor-related protein 9A

Specificity

This assay has high sensitivity and excellent specificity for detection of C1q And Tumor Necrosis Factor Related Protein 9 (C1QTNF9).
No significant cross-reactivity or interference between C1q And Tumor Necrosis Factor Related Protein 9 (C1QTNF9) and analogues was observed.

Recovery

Matrices listed below were spiked with certain level of recombinant C1q And Tumor Necrosis Factor Related Protein 9 (C1QTNF9) and the recovery rates were calculated by comparing the measured value to the expected amount of C1q And Tumor Necrosis Factor Related Protein 9 (C1QTNF9) in samples.

Matrix Recovery range (%) Average(%)
serum(n=5) 83-101 88
EDTA plasma(n=5) 94-101 98
heparin plasma(n=5) 88-103 94

Precision

Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level C1q And Tumor Necrosis Factor Related Protein 9 (C1QTNF9) were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level C1q And Tumor Necrosis Factor Related Protein 9 (C1QTNF9) 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 C1q And Tumor Necrosis Factor Related Protein 9 (C1QTNF9) 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) 97-105% 79-98% 99-105% 98-105%
EDTA plasma(n=5) 95-105% 97-105% 87-101% 97-105%
heparin plasma(n=5) 88-96% 91-98% 84-96% 95-102%

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
Int J Obes (Lond). Association of serum C1q/TNF-Related Protein-9 (CTRP9) concentration with visceral adiposity and metabolic syndrome in humans. Pubmed: 24357853
J Clin Endocrinol Metab.? Association of Serum C1q/TNF-Related Protein-9 Concentration With Arterial Stiffness in Subjects With Type 2 Diabetes Pubmed:25105737
J Clin Endocrinol Metab.  C1q/TNF-Related Protein-9 (CTRP9) Levels Are Associated With Obesity and Decrease Following Weight Loss Surgery Pubmed:26982010
PLoS One. Circulating C1q complement/TNF-related protein (CTRP) 1, CTRP9, CTRP12 and CTRP13 concentrations in Type 2 diabetes mellitus: In vivo regulation by glucose. pubmed:28207876
Journal of Diabetes Research Plasma C1q/TNF-Related Protein-9 Levels Are Associated with Atherosclerosis in Patients withType 2 Diabetes without Renal Dysfunction. pubmed:28070523
diabetes research and clinical practice Circulating CTRP9 levels are increased in patients with newly diagnosed type 2 diabetes and correlated with insulin resistance pubmed:28743061
PLoS One Association of circulating CTRP9 with soluble adhesion molecules and inflammatory markers in patients with type 2 diabetes mellitus and coronary artery … Pubmed:29381773
archives of insect biochemistry and physiology Effect of a single bout of resistance exercise on zinc-α2-glycoprotein Pubmed: 31686532
J Diabetes Investig Association of serum CTRP9 levels with cardiac autonomic neuropathy in patients with type 2 diabetes mellitus 33417302
Neurol Ther Association Between Serum C1q Tumor Necrosis Factor-Related Protein 9 and the Clinical Characteristics and Prognosis of Ischemic Stroke 34727346
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