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Affinity capture mass spectrometry was used to isolate and ionize protein A from Staphylococcus aureus from both a commercial source and cell culture lysate using matrix assisted laser desorption/ionization (MALDI) mass spectrometry. Two surfaces are compared: gold surfaces with immunoglobulin G covalently immobilized and silica surfaces with a covalently bound small peptide discovered via biopanning. A detection limit of 2.22 bacterial cells/mL of culture fluid was determined for the immobilized peptide surfaces. This study emphasizes the ability to use peptide ligands to effectively capture a biomarker protein out of a complex mixture. This demonstrates the potential to use biopanning to generate capture ligands for a large variety of target proteins and subsequently detect the captured protein using MALDI mass spectrometry.

Affinity Capture Mass Spectrometry of Biomarker Proteins Using Peptide Ligands from Biopanning