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          規格: 價格:
          48T ¥1680.00
          96T ¥2400.00

          Overview 文獻

          Product name: Human TNFa(Tumor Necrosis Factor Alpha) ELISA Kit
          Reactivity: Human
          Alternative Names: TNF Alpha; DIF; TNF-A; TNFSF2; Cachectin; Tumor Necrosis Factor Ligand Superfamily Member 2
          Assay Type: Sandwich
          Sensitivity: 6.5 pg/mL
          Standard: 1000 pg/mL
          Detection Range: 15.63-1000 pg/mL
          Sample Type: serum, plasma, tissue homogenates, cell lysates, cell culture supernates and other biological fluids
          Assay Length: 3.5h
          Research Area: Cytokine;Tumor immunity;Infection immunity;
          Uniprot ID: P01375
          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 Human TNFa. Standards or samples are added to the appropriate microtiter plate wells then with a biotin-conjugated antibody specific to Human TNFa. 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 Human TNFa, 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 Human TNFa in the samples is then determined by comparing the OD of the samples to the standard curve.


          Concentration (pg/mL) OD Corrected OD
          1000.00 2.214 2.086
          500.00 1.784 1.656
          250.00 1.243 1.115
          125.00 0.872 0.744
          62.50 0.546 0.418
          31.25 0.325 0.197
          15.63 0.240 0.112
          0.00 0.128 0.000


          Intra-assay Precision (Precision within an assay):CV%<8%

          Three samples of known concentration were tested twenty times on one plate to assess intra-assay precision.

          Inter-assay Precision (Precision between assays):CV%<10%

          Three samples of known concentration were tested in forty separate assays to assess inter-assay precision.


          Matrices listed below were spiked with certain level of recombinant TNFa and the recovery rates were calculated by comparing the measured value to the expected amount of TNFa in samples.
          Matrix Recovery range Average
          serum(n=5) 83-95% 89%
          EDTA plasma(n=5) 88-102% 95%
          Heparin plasma(n=5) 79-97% 88%


          The linearity of the kit was assayed by testing samples spiked with appropriate concentration of TNFa and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected.
          Matrix 1:2 1:4 1:8 1:16
          serum(n=5) 87-96% 91-101% 87-98% 89-103%
          EDTA plasma(n=5) 84-94% 85-103% 94-105% 92-101%
          Heparin plasma(n=5) 88-104% 84-98% 95-105% 88-102%


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