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Multiplex immunoassay

Manufactured by Eve Technologies
Sourced in Canada

The Multiplex immunoassay is a laboratory equipment used to simultaneously detect and quantify multiple analytes in a single sample. It employs a combination of antibodies and fluorescent dyes to identify and measure the presence of specific proteins, cytokines, or other biomolecules in a sample. The core function of this equipment is to provide efficient and high-throughput analysis of complex biological samples.

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3 protocols using multiplex immunoassay

1

Luminescence and ELISA Assay Protocol

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For luminescence assays, media was harvested 24 hours post-transfection. To detect luminescence from Gaussia luciferase, 20uL of tissue culture medium was transferred to a flat-bottomed white-walled plate (Corning). 25uL of BioLux Gaussia Luciferase reagent including stabilizer (New England Biolabs) was added to each sample and luminescence was measured on an Infinite 200Pro Microplate Reader (Tecan) after 45 seconds. Human erythropoietin was detected by solid phase sandwich ELISA (R&D Systems) essentially according to the manufacturer’s instructions. Cytokines in Figures 1, 3 and 5 were detected by Fireplex immunoassay (Abcam). Cytokines in Figures 2 and 6 were detected by individual or multiplex immunoassay (Eve Technologies). For all multi-day GLuc and hEpo data, expression is presented relative to the first day of expression for each condition.
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2

Characterization of Ileal Mucosal Disaccharidase and IgA

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Ileal mucosal scrapings (0.5 g) were added to 4.5 mL of PBS containing a protease inhibitor cocktail (Sigma Aldrich, St. Louis, MO) and triton (0.1%). The resulting solution was homogenized and centrifuged at 10,000 × g for 15 min at 4 °C and the supernatant was stored in aliquots. Total protein concentration of hydrolyzed mucosa was quantified using a Pierce bicinchoninic acid Protein Assay kit (Thermo Scientific, Woltham, MA). The intra-assay coefficient of variation was 6.4%. Disaccharidase-specific activity was determined as previously described by Dahlqvist (1964) (link) using lactose, maltose, and sucrose as substrates. The intra- and interassay coefficients of variation was 7.3 and 14.7%. Enzyme activity was expressed as μmol hydrolyzed substrate × min-1×g tissue protein-1. Concentration of secretory IgA was obtained using a porcine-specific ELISA kit following manufacturer’s instructions (Bethyl Laboratories, Inc., Montegomery, TX). The intra-assay coefficient of variation was 3.8%. Homogenized mucosa and plasma subsamples were analyzed for cytokines using a Multiplex Immunoassay (Eve Technologies, Calgary, AB, Canada).
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3

Multiplex Cytokine Quantification in BALF

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Cytokine protein levels in the bronchoalveolar lavage fluids (BALF) were determined by multiplex immunoassay (Eve Technologies, Calgary, AB, Canada). All samples were twofold diluted in 1% triton X-100 (final) for decontamination.
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