Hydrophilic Carboxyl Cotton Chelator for Titanium(IV) Immobilization and Its Application as Novel Fibrous Sorbent for Rapid Enrichment of Phosphopeptides

TL;DRAbstract

Sample preparation methods with high selectivity, efficiency, and matrix resistance are essential for phosphoproteomic analysis. In this study, carboxyl cotton chelator-titanium(IV) (CCC-Ti4+) fibers, a novel CCC-based fibrous sorbent with excellent biocompatibility, were successfully synthesized on the basis of the coordination effect between double carboxyl groups on CCC and Ti4+. The synthesis of CCC-Ti4+ fibers was easy, and the incorporated titanium content was high. On the basis of immobilized metal ion affinity chromatography (IMAC), CCC-Ti4+ fibers were used for specific capture of phosphopeptides using a lab-in-syringe solid-phase extraction (SPE) from multiple biological samples, including standard protein digests, nonfat milk digests, human serum, and animal tissue. The proposed sorbent exhibited high selectivity (β-casein/BSA=1:1000) and good sensitivity (10 fmol) in phosphopeptides analysis. Meanwhile, the lab-in-syringe SPE greatly simplified the entire process of enrichm

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