title: Enrichment of peptides in serum by C(8)-functionalized magnetic nanoparticles for direct matrix-assisted laser desorption/ionization time-of-flight mass spectrometry analysis.
abstract: Human serum contains a complex array of proteolytically derived peptides (serum peptidome), which contain biomarkers of preclinical screening and disease diagnosis. Recently, commercial C(8)-functionalized magnetic beads (1-10 microm) were widely applied to the separation and enrichment of peptides in human serum, prior to matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) analysis. In this work, laboratory-prepared C(8)-functionalized magnetic nanoparticles (about 50 nm) were prepared and applied to the fast separation and the enrichment of peptides from serum. At first, the C(8)-magnetic nanoparticles were synthesized by modifying amine-functionalized magnetic nanoparticles with chlorodimethyloctylsilane. These synthesized C(8)-amine-functionalized magnetic particles have excellent magnetic responsibility, high dispersibility and large surface area. Finally, the C(8)-magnetic nanoparticles were successfully applied to fast and efficient enrichment of low-abundance peptides from protein tryptic digestion and human serum followed by MALDI-TOF-MS analysis.
authors.affiliation: Department of Chemistry, Fudan University, Shanghai 200433, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Yao
authors.forename: Hemei
authors.initials: H
authors.lastname: Chen
authors.forename: Huaqing
authors.initials: H
authors.lastname: Lin
authors.forename: Chunhui
authors.initials: C
authors.lastname: Deng
authors.forename: Xiangmin
authors.initials: X
authors.lastname: Zhang
mesh_terms: D000588:Amines / Q000737:chemistry; D006801:Humans; D008280:Magnetics; D053758:Nanoparticles / Q000737:chemistry; D010455:Peptides / Q000097:blood* / Q000378:metabolism; D011506:Proteins / Q000378:metabolism; D044967:Serum / Q000737:chemistry; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*
chemical_list: D000588:Amines; D010455:Peptides; D011506:Proteins