Solid phase extraction using magnetic core mesoporous shell microspheres with C18-modified interior pore-walls for residue analysis of cephalosporins in milk by LC–MS/MS.

Highlights: [•] A cephalosporins enrichment technique based on C18-Fe3O4@mSiO2 was developed. [•] The mesopores on the surface of the microspheres exclude proteins. [•] The strong magnetic behaviors of the microspheres ensure a fast separation. [ABSTRACT FROM AUTHOR]