ELISA Kit for Surfactant Associated Protein D (SPD)
SFTPD; COLEC7; PSP-D; SFTP4; SP-D; Pulmonary Surfactant Protein D; Collectin-7; Lung surfactant protein D
- Product No.SEB039Ra
- Organism SpeciesRattus norvegicus (Rat) Same name, Different species.
- Test MethodDouble-antibody Sandwich
- Assay Length3h
- Detection Range7.8-500pg/mL
- SensitivityThe minimum detectable dose of this kit is typically less than 2.6pg/mL.
- Sample TypeSerum, plasma, lung lavage fluid and other biological fluids
- Download Instruction Manual
- UOM 48T96T 96T*5 96T*10 96T*100
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Packages (Simulation)
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Packages (Simulation)
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Results demonstration
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Typical Standard Curve
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ISO9001: 2008, ISO13485: 2003 Registered
Specificity of the ELISA Kit for Surfactant Associated Protein D (SPD)
This assay has high sensitivity and excellent specificity for detection of Surfactant Associated Protein D (SPD).
No significant cross-reactivity or interference between Surfactant Associated Protein D (SPD) and analogues was observed.
Recovery of the ELISA Kit for Surfactant Associated Protein D (SPD)
Matrices listed below were spiked with certain level of recombinant Surfactant Associated Protein D (SPD) and the recovery rates were calculated by comparing the measured value to the expected amount of Surfactant Associated Protein D (SPD) in samples.
| Matrix | Recovery range (%) | Average(%) |
| serum(n=5) | 86-94 | 91 |
| EDTA plasma(n=5) | 93-101 | 97 |
| heparin plasma(n=5) | 81-98 | 91 |
Precision of the ELISA Kit for Surfactant Associated Protein D (SPD)
Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level Surfactant Associated Protein D (SPD) were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level Surfactant Associated Protein D (SPD) were tested on 3 different plates, 8 replicates in each plate.
CV(%) = SD/meanX100
Intra-Assay: CV<10%
Inter-Assay: CV<12%
Linearity of the ELISA Kit for Surfactant Associated Protein D (SPD)
The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Surfactant Associated Protein D (SPD) 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) | 90-104% | 85-97% | 89-98% | 96-103% |
| EDTA plasma(n=5) | 94-101% | 93-101% | 91-99% | 85-99% |
| heparin plasma(n=5) | 80-103% | 85-96% | 85-104% | 80-98% |
Stability of the ELISA Kit for Surfactant Associated Protein D (SPD)
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.
Assay procedure summary of the ELISA Kit for Surfactant Associated Protein D (SPD)
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.
Test principle of the ELISA Kit for Surfactant Associated Protein D (SPD)
The test principle applied in this kit is Sandwich enzyme immunoassay. The microtiter plate provided in this kit has been pre-coated with an antibody specific to Surfactant Associated Protein D (SPD). Standards or samples are then added to the appropriate microtiter plate wells with a biotin-conjugated antibody specific to Surfactant Associated Protein D (SPD). Next, Avidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. After TMB substrate solution is added, only those wells that contain Surfactant Associated Protein D (SPD), biotin-conjugated antibody and enzyme-conjugated Avidin will exhibit a change in color. The enzyme-substrate reaction is terminated by the addition of sulphuric acid solution and the color change is measured spectrophotometrically at a wavelength of 450nm ± 10nm. The concentration of Surfactant Associated Protein D (SPD) in the samples is then determined by comparing the O.D. of the samples to the standard curve.
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