ELISA Kit for Glutamine synthetase (GS)

GLNS; GLUL; Glutamate-Ammonia Ligase; Glutamate decarboxylase


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


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

Matrix Recovery range (%) Average(%)
serum(n=5) 83-97 87
EDTA plasma(n=5) 90-99 93
heparin plasma(n=5) 79-90 83


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


The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Glutamine synthetase (GS) 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) 79-89% 84-92% 79-95% 89-96%
EDTA plasma(n=5) 99-105% 86-101% 84-98% 98-105%
heparin plasma(n=5) 78-94% 95-102% 96-103% 79-92%


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.



Magazine Citations
The FASEB Journal Cargo proteins of plasma astrocyte-derived exosomes in Alzheimer’s disease pubmed:27511944
Annals of Neurology  High complement levels in astrocyte‐derived exosomes of Alzheimer disease Pubmed:29406582
Journal of Neuroscience Sex differences in the glutamate signaling pathway in juvenile rats Pubmed:28861894
FASEB Journal Deficient neurotrophic factors of CSPG4-type neural cell exosomes in Alzheimer disease Pubmed:29924942
Hepatology Research Glutamine synthetase promotes tumor invasion in hepatocellular carcinoma through mediating epithelial–mesenchymal transition Pubmed: 31652385
FASEB JOURNAL Traumatic brain injury increases plasma astrocyte‐derived exosome levels of neurotoxic complement proteins Pubmed: 31916313
Translational Psychiatry Decreased mitochondrial electron transport proteins and increased complement mediators in plasma neural-derived exosomes of early psychosis Pubmed: 33106473
Drug Repurposing of Asparaginase and Vitamin C Targeting Glutamine Synthetase Improves Anticancer Effect in Metastatic Castration-resistant Prostate …
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