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CLIA Kit for Arginine (Arg)

(S)-2-Amino-5-Guanidinopentanoic Acid

Specificity

This assay has high sensitivity and excellent specificity for detection of Arginine (Arg).
No significant cross-reactivity or interference between Arginine (Arg) and analogues was observed.

Recovery

Matrices listed below were spiked with certain level of Arginine (Arg) and the recovery rates were calculated by comparing the measured value to the expected amount of Arginine (Arg) in samples.

Matrix Recovery range (%) Average(%)
serum(n=5) 90-104 96
EDTA plasma(n=5) 98-105 102
heparin plasma(n=5) 88-102 95

Precision

Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level Arginine (Arg) were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level Arginine (Arg) 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 Arginine (Arg) 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) 88-98% 99-105% 78-99% 90-102%
EDTA plasma(n=5) 94-101% 79-103% 79-90% 79-94%
heparin plasma(n=5) 83-91% 80-88% 81-95% 98-105%

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
Substrate A 1×10mL Substrate B 1×2mL
Wash Buffer (30 × concentrate) 1×20mL Instruction manual 1

Assay procedure summary

1. Prepare all reagents, samples and standards;
2. Add 50µL standard or sample to each well.
    And then add 50µL prepared Detection Reagent A immediately.
    Shake and mix. Incubate 1 hour at 37°C;
3. Aspirate and wash 3 times;
4. Add 100µL prepared Detection Reagent B. Incubate 30 minutes at 37°C;
5. Aspirate and wash 5 times;
6. Add 100µL Substrate Solution. Incubate 10 minutes at 37°C;
7. Read RLU value immediately.

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Magazine Citations
The Journal of Physiology Asymmetric dimethylarginine (ADMA) elevation and arginase up-regulation contribute toendothelial dysfunction related to insulin resistance in rats and morbidly obese humans. pubmed:26840628
Cell Death & Disease α-ketoglutarate dehydrogenase inhibition counteracts breast cancer-associated lung metastasis Pubmed:29988033
Nutrition, Metabolism and Cardiovascular Diseases Arginine bioavailability and endothelin-1 system in the regulation of vascular function of umbilical vein endothelial cells from intrauterine growth restricted newborns Doi: 10.1016/j.numecd.2018.09.002
Nitric Oxide Effects of dietary nitrate supplementation on microvascular physiology at 4559 m altitude–A randomised controlled trial (Xtreme Alps) Pubmed: 31604146
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