ELISA Kit for Growth Hormone Releasing Hormone (GHRH)

GRF; GHRF; Somatocrinin; Growth-Hormone-Releasing Factor; Sermorelin; Somatoliberin

Specificity

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

Recovery

Matrices listed below were spiked with certain level of recombinant Growth Hormone Releasing Hormone (GHRH) and the recovery rates were calculated by comparing the measured value to the expected amount of Growth Hormone Releasing Hormone (GHRH) in samples.

Matrix Recovery range (%) Average(%)
serum(n=5) 82-103 99
EDTA plasma(n=5) 83-101 96
heparin plasma(n=5) 85-96 91

Precision

Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level Growth Hormone Releasing Hormone (GHRH) were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level Growth Hormone Releasing Hormone (GHRH) 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 Growth Hormone Releasing Hormone (GHRH) 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) 94-102% 82-101% 80-104% 85-93%
EDTA plasma(n=5) 83-94% 98-105% 78-102% 87-104%
heparin plasma(n=5) 96-104% 82-98% 78-96% 92-105%

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
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 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 90µL Substrate Solution. Incubate 10-20 minutes at 37°C;
7. Add 50µL Stop Solution. Read at 450 nm immediately.

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Magazine Citations
19 Role of GHRH in Sleep and Growth Impairments Induced by Upper Airway Obstruction in Rats Ers: 00197610
19 Role of growth hormone-releasing hormone in sleep and growth impairments induced by upper airway obstruction in rats PubMed: 21406516
Global Veterinaria Effect of Moringa Oleifera Extract on Nicotine Induced Neurotoxicity in Female Rat and Their Embryos Idosi: Source
Cell Reports Zika Virus Infection in Hypothalamus Causes Hormone Deficiencies and Leads to Irreversible Growth Delay and Memory Impairment in Mice Pubmed: 30404008
Drug Testing and Analysis An Immuno‐PCR screen for the detection of CJC‐1295 and other Growth Hormone Releasing Hormone analogues in equine plasma Pubmed: 30489688
Sleep and Breathing Effects of somatotropic axis on cognitive dysfunction of obstructive sleep apnea Pubmed: 31073904
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