Human lung surfactant-associated protein B (SP-B) ELISA kit can only be used for scientific research, not for medical diagnosis Human lung surfactant-associated protein B (SP-B) ELISA kit Instructions for use Testing principle: Reagent The cassette adopts double antibody one-step sandwich enzyme-linked immunosorbent assay (ELISA). To the coated microwells pre-coated with the lung surfactant-related protein B (SP-B) antibody, add the specimen, standard, and HRP-labeled detection antibody in sequence, incubate and wash thoroughly. The color is developed with the substrate TMB, which is converted into blue under the catalysis of peroxidase and into the final yellow under the action of acid. The color depth is positively correlated with the lung surfactant-related protein B (SP-B) in the sample. The absorbance (OD value) was measured with a microplate reader at a wavelength of 450 nm, and the sample concentration was calculated. Sample collection, processing and storage methods: 1. Serum: Use a test tube that does not contain pyrogens and endotoxins. Avoid any cell stimulation during the operation. After collecting blood, centrifuge at 3000 rpm for 10 minutes to quickly and carefully separate serum and red blood cells. 2. Plasma: EDTA, citrate or heparin anticoagulation. Take the supernatant by centrifugation at 3000 rpm for 30 minutes. 3. Cell supernatant: centrifuge at 3000 rpm for 10 minutes to remove particles and polymer. 4. Tissue homogenate: The tissue is crushed by adding appropriate amount of normal saline. Take the supernatant by centrifugation at 3000 rpm for 10 minutes. 5. Preservation: If the sample is not tested in time after collection, please aliquot it in one dose and freeze it at -20 ℃ to avoid repeated freezing and thawing. Thaw at room temperature and ensure that the sample is thawed evenly and fully. Self-provided items: 1.37 ° C incubator 2. High-precision sampler and pipette tip: 0.5-10uL, 2-20uL, 20-200uL, 200-1000uL Equilibrate at room temperature for 20 minutes at 2-8 ° C before use. The concentrated washing liquid taken out of the refrigerator will have crystals, which is a normal phenomenon. The water bath is heated to completely dissolve the crystals before use. 2. The slats not used in the experiment should be immediately returned to the ziplock bag, sealed (dried at low temperature) and stored. 3. The S0 standard with a concentration of 0 can be regarded as a negative control or blank; the sample has been diluted 5 times when operated according to the instructions, and the final result is multiplied by 5 to be the actual concentration of the sample. 4. Carry out the incubation operation strictly in accordance with the time, amount of liquid and sequence indicated in the manual. 5. Shake all liquid components thoroughly before use. Composition of Human Lung Surfactant Related Protein B (SP-B) ELISA Kit: 1. Name 96-well configuration 48-well configuration remarks 2. Microwell enzyme plate 12 wells × 8 strips 12 wells × 4 strips None 3. Standard 0.3mL * 6 tube 0.3mL * 6 tube None 4. Sample diluent 6mL 3mL None 5. Detection antibody-HRP 10mL 5mL None 6.20 × Wash buffer 25mL 15mL Dilute according to the instructions 7. Substrate A 6mL 3mL None 8. Bottom Substance B 6mL 3mL None 9. Stop solution 6mL 3mL None 10. Sealing film 2 sheets 2 sheets none 11. Instructions 1 part 1 part no 12. Ziplock bag 1 piece 1 no Note: The concentration of standard products (S0-S5) is in order For: 0, 3, 6, 12, 24, 48 pg / mL reagent preparation: 20 × wash buffer dilution: 1:20 dilution of distilled water, that is, 1 part of 20 × wash buffer plus 19 parts of distilled water. Plate washing method: 1. Automatic plate washing machine: inject 350μL of washing liquid into each well, soak for 1min, and wash the plate 5 times. 2. Manually wash the plate: throw away the liquid in the hole, fill each hole with the washing liquid, and after 1 minute, shake off the liquid in the hole, pat dry on absorbent paper, and wash the plate 5 times in this way. Operation steps: 1. Take out the required slats from the aluminum foil bag after equilibrating at room temperature for 20min, and the remaining slats shall be sealed in a ziplock bag and put back at 4 ℃. 2. Set up standard wells and sample wells, and add 50μL of standard products of different concentrations to the standard wells; 3. Add 10μL of the sample to be tested to the sample wells, and then add 40μL of the sample diluent; no blank wells. 4. In addition to the blank wells, add 100 μL of horseradish peroxidase (HRP) -labeled detection antibody to each of the standard wells and sample wells, seal the reaction wells with a sealing plate, and incubate in a 37 ° C water bath or incubator 60min. 5. Discard the liquid, pat dry on absorbent paper, fill each well with washing liquid, let stand for 1min, shake off the washing liquid, pat dry on absorbent paper, and repeat washing the plate 5 times (you can also wash the plate with a washing machine). 6. Add 50 μL of substrate A and B to each well, and incubate at 37 ° C in the dark for 15 minutes. 7. Add 50μL of stop solution to each well, and measure the OD value of each well at 450nm wavelength within 15min. 8. Judgment of results 9. Draw a standard curve: In the Excel worksheet, the standard product concentration is used as the abscissa, and the corresponding OD value is used as the ordinate. Kit performance: 1. Accuracy: R value of the linear regression of the standard product and the expected concentration, greater than or equal to 0.9900. 2. Sensitivity: The minimum detection concentration is less than 1.0pg / mL. 3. Specificity: does not cross-react with other soluble structural analogs. 4. Repeatability: The coefficients of variation within and between plates are less than 15%. 5. Storage: Store at 2-8 ℃, protected from light and moisture. 6. Validity: 6 months
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