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Detection limit challenges associated with measuring low-abundance protein biomarkers can be addressed with hybrid immunoaffinity-mass spectrometric assays, such as antipeptide antibody capture followed by liquid chromatography/tandem mass spectrometry (LC-MS/MS). Popular assay formats use magnetic bead-based immunoaffinity enrichment and nanoflow LC-MS/MS or high-flow immunoaffinity chromatography coupled online to conventional LC-MS/MS. As a proof of principle, we describe a novel online immunoaffinity LC-MS/MS configuration that combines high-flow peptide immunoaffinity enrichment and nanoflow LC-MS/MS.

Online High-Flow Peptide Immunoaffinity Enrichment and Nanoflow LC-MS/MS: Assay Development for Total Salivary Pepsin/Pepsinogen