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ELISA Kit for Surfactant Associated Protein D (SPD) Homo sapiens (Human) Sandwich ELISA

SFTPD; COLEC7; PSP-D; SFTP4; SP-D; Pulmonary Surfactant Protein D; Collectin-7; Lung surfactant protein D

  • Product No.SEB039Hu
  • Organism SpeciesHomo sapiens (Human) Same name, Different species.
  • Sample Typeserum, plasma, tissue homogenates, cell lysates, lung lavage fluid, cell culture supernates and other biological fluids
  • Test MethodDouble-antibody Sandwich
  • Assay Length3h
  • Detection Range0.625-40ng/mL
  • SensitivityThe minimum detectable dose of this kit is typically less than 0.233ng/mL.
  • Specificity 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.
  • ApplicationsEnzyme-linked immunosorbent assay for Antigen Detection.
  • DownloadInstruction Manual
  • UOM 48T96T 96T*5 96T*10 96T*100 Ensure in stock; if not, free redo!
  • FOB US$ 349.00 US$ 498.00 US$ 2,241.00 US$ 4,233.00 US$ 34,860.00
  • Quantity
  • Add to Cart Distributors
  • ELISA Kit for Surfactant Associated Protein D (SPD) Packages (Simulation)
  • ELISA Kit for Surfactant Associated Protein D (SPD) Packages (Simulation)
  • ELISA Kit for Surfactant Associated Protein D (SPD) Results demonstration
  • SEB039Hu.jpg Typical Standard Curve
  • Certificate ISO9001: 2008, ISO13485: 2003 Registered


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) 88-96 92
EDTA plasma(n=5) 79-97 91
heparin plasma(n=5) 78-93 81


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%


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) 91-99% 97-104% 89-98% 86-103%
EDTA plasma(n=5) 85-103% 96-105% 99-105% 92-101%
heparin plasma(n=5) 88-95% 92-99% 80-101% 94-102%


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.

ELISA Kit for Surfactant Associated Protein D (SPD)

Test principle

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.


  • The American Journal of Rhinology & AllergySurfactant protein A and D in chronic rhinosinusitis with nasal polyposis and corticosteroid responseIngenta: art00005
  • J Occup HealthEvaluation of acute oxidative stress induced by NiO nanoparticles in vivo and in vitroPubMed: 21233593
  • Inhalation ToxicologyComparison of acute oxidative stress on rat lung induced by nano and fine-scale, soluble and insoluble metal oxide particles: NiO and TiO2PubMed: 22642288
  • American Journal of Rhinology & AllergyDetection of surfactant proteins A, B, C, and D in human nasal mucosa and their regulation in chronic rhinosinusitis with polypsPubMed: 23406594
  • Plos oneStaphylococcus aureus and Pseudomonas aeruginosa Express and Secrete Human Surfactant ProteinsPubMed: PMC3551896
  • Plos oneThe Detection of Surfactant Proteins A, B, C and D in the Human Brain and Their Regulation in Cerebral Infarction, Autoimmune Conditions and Infections of the CNSPubMed: PMC3787032
  • Nachweis und Charakterisierung des Oberfl?chenproteins PLUNC (Palate, Lung and Nasal Clone Protein) an der Augenoberfl?che und Bedeutung für das Trockene AugeOpus4:Source
  • PLoS OneThe Cerebral Surfactant System and Its Alteration in HydrocephalicConditions.pubmed:27656877
  • Frontiers in Aging NeuroscienceCorrelations of Ventricular Enlargement with Rheologically Active SurfactantProteins in Cerebrospinal Fluid.pubmed:28101052

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