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  • Application Note

    A Novel DELFIA Time-Resolved Fluorescence Biomarker Detection Assay with Superior Performance to Conventional ELISA

    DELFIA® (Dissociated-Enhanced Lanthanide Fluorescent Immunoassay) TRF is a proven, robust immunodetection platform with over 20 years of history. DELFIA has a similar assay principle and workflow to that of a traditional ELISA, but with the added benefits of a stable, time-resolved fluorescent signal, and improved assay dynamic range.

    Download this application note to see how DELFIA TRF outperforms ELISA as a robust assay providing high sensitivity, superior signal stability, and a wider dynamic range.

  • Application Note

    Applicability of DELFIA Fluorescence-Based Immunoassay Technology to Detect and Quantitate Biomarker

    DELFIA® (Dissociated-Enhanced Lanthanide Fluorescent Immunoassay) TRF is a proven, robust immunodetection platform with over 20 years of history. DELFIA has a similar assay principle and workflow to that of a traditional ELISA, but with the added benefits of a stable, time-resolved fluorescent signal, and improved assay dynamic range.

    Download this application note to see how DELFIA time-resolved fluorescence (TRF) technology serves as an alternative to traditional ELISA with a wider dynamic range and superior signal stability for quantitation of biomarkers in complex sample types, including serum, plasma, and blood.

  • Application Note

    Guidelines for Optimization of a Cell-Labelling Method for DELFIA-TRF Cytotoxicity Assays

    The DELFIA® EuTDA Cytotoxicity Reagent Kit has been developed to label a specific cell population and monitor cytotoxic events by cell-mediated or antibody-dependent cellular cytotoxicity (ADCC). The method is based on the loading of BATDA into specifically labeled cell lines whose cell death follows the release of TDA into the cell supernatant. A europium solution is added, and the TDA then forms a highly fluorescent lanthanide chelate (EuTDA). Therefore, the cytotoxic effect on the target cells is proportional to the amount of time-resolved fluorescent signal generated by the final EuTDA product.

    In this application note, we see that the spontaneous release phenomenon leads to TDA release into the medium prior to cell death. We tested two efflux inhibitors on four cell lines (Daudi cells, CHO-K1 cells, Jurkat cells, NIH3T3 cells) to:

    • Minimize the spontaneous release of TDA in the cell environment
    • Evaluate the effectiveness of inhibitors in improving the test window
    • Obtain a specific release using a small cytotoxic molecule, Raptinal