Magnetic multi-walled carbon nanotubes (mag-MWCNTs) were used for sulfonylurea (SU).
Mag-MWCNTs proved effective for magnetic solid-phase extraction (MSPE) of SU.
The mag-MWCNTs-MSPE showed high-effective enrichment and rapid separation of SU.
The mag-MWCNTs-MSPE-HPLC method proved fast, sensitive, reusable and practical.