“…fibrates) it is advisable to acidify the samples to pH 2-3 while using Oasis MCX cartridge (Martin et al, 2011;Pereira et al, 2015). Statins are better extracted at neutral pH than under acidic conditions on mix mode polymeric sorbents 3,4,7,15,17,20,22,23,26,28,29,30,33,34,36,39,41,48,55,63,68,79,85 (Martin et al, 2011).…”