Journal: Journal of immunological methods
Article Title: Endogenous peroxidases in sputum interfere with horse-radish peroxidase-based ELISAs
doi: 10.1016/j.jim.2017.11.005
Figure Lengend Snippet: Schematic representation of commonly used immunoassays and colour-development protocols in sputum research: (A) AP-based ELISA, (B) HRP-based ELISA, It is to be noted that some ELISA protocols like the R&D system duo-sets, follows a peroxidase based colour development for biotinylated secondary antibodies. An intermediate streptavidin-HRP complex reagent is used where the streptavidin binds covalently to the biotin while the HRP catalyzes the substrate to generate the chromogenic product. (C) Milliplex or bead-based multiplex system employs polystyrene beads surface-conjugated with capture antibodies. Essentially, the sandwich structure (capture antibody-antigen-detection antibody) of an ELISA is maintained but without the requirement of an enzymatic reaction. Instead, the detection is based on Streptavidin-conjugated phycoerythrin (PE, emission at 578 nm) which covalently binds to the biotinylated detection antibody. (D) IL-8 absolute values obtained from n=47 samples analysed by the three methods, Data represented as median (Interquartile range). Kruskal-Wallis test, Dunn multiple comparison test. P<0.05 considered as significant difference.
Article Snippet: IL-8 levels were hence analysed with a Millipore Milliplex kit (Human High Sensitivity T-Cell Discovery Array 14-plex) on BioPlex 200 system by Eve Technologies Inc., (Calgary, Alberta, Canada).
Techniques: Enzyme-linked Immunosorbent Assay, Multiplex Assay