Application of solid-phase extraction to the isolation and determination of paracetamol and its metabolites.

A series of clean-up columns for solid-phase extraction (SPE) were packed with various C18 phases of different physico-chemical surface properties. These SPE columns were used for the isolation and determination of paracetamol and its metabolites from biological samples. The packing with a monomeric structure of chemically bonded phase showed the best recovery of tested substances in urine.