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Titanium dioxide (TiO2) has been widely used for phosphopeptide enrichment. Several approaches have been reported to produce magnetic TiO2 affinity probes. In this report, we present a facile approach to immobilize TiO2 onto poly(acrylic acid)‐functionalized magnetic carbon‐encapsulated iron nanoparticles as affinity probes for efficient enrichment of phosphopeptides. By using the new magnetic TiO...