ELISA Kit for Immunoglobulin G (IgG)
FOR IN VITRO AND RESEARCH USE ONLY, NOT FOR USE IN CLINICAL DIAGNOSTIC PROCEDURES!
| Organism species | Homo sapiens (Human) |
| Product No. | CEA544Hu |
| Sample type | Serum, plasma and other biological fluids. |
| Format | 96-well strip plate |
| Assay length | 2.5 hours |
| Detection range | 1.23-100ug/mL The standard curve concentrations used for the ELISA’s were 100ug/mL, 33.33ug/mL, 11.11ug/mL, 3.7ug/mL, 1.23ug/mL |
| Sensitivity | The minimum detectable dose of this kit is typically less than 0.46ug/mL. |
Specificity
This assay has high sensitivity and excellent specificity for detection of Immunoglobulin G (IgG).
No significant cross-reactivity or interference between Immunoglobulin G (IgG) and analogues was observed.
Recovery
Matrices listed below were spiked with certain level of recombinant Immunoglobulin G (IgG) and the recovery rates were calculated by comparing the measured value to the expected amount of Immunoglobulin G (IgG) in samples.
| Matrix | Recovery range (%) | Average(%) |
| serum(n=5) | 80-94 | 85 |
| EDTA plasma(n=5) | 84-92 | 88 |
| heparin plasma(n=5) | 80-95 | 86 |
Precision
Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level Immunoglobulin G (IgG) were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level Immunoglobulin G (IgG) 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 Immunoglobulin G (IgG) 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) | 79-99% | 97-105% | 80-91% | 78-97% |
| EDTA plasma(n=5) | 79-97% | 90-104% | 87-96% | 81-99% |
| heparin plasma(n=5) | 85-102% | 82-96% | 78-92% | 85-98% |
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 |
| 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 37oC;
3. Aspirate and wash 5 times;
4. Add 90µL Substrate Solution. Incubate 15-25 minutes at 37oC;
5. Add 50µL Stop Solution. Read at 450 nm immediately.
Test principle
This assay employs the competitive inhibition enzyme immunoassay technique. An antibody specific to Immunoglobulin G (IgG) has been pre-coated onto a microplate. A competitive inhibition reaction is launched between Horseradish Peroxidase (HRP) labeled Immunoglobulin G (IgG) and unlabeled Immunoglobulin G (IgG) (Standards or samples) with the pre-coated antibody specific to Immunoglobulin G (IgG). After incubation the unbound conjugate is washed off. The amount of bound HRP conjugate is reverse proportional to the concentration of Immunoglobulin G (IgG) in the sample. After addition of the substrate solution, the intensity of color developed is reverse proportional to the concentration of Immunoglobulin G (IgG) in the sample.
