Rey-Salgueiro et al.37 also investigated the levels of 3-
hydroxybenzo[a]pyrene in the bile and plasma of Nile tilapia
after waterborne exposure to benzo[a]pyrene (10 and 100 mg/
L). Metabolites were detected in bile and plasma, and
conjugates of 3-hydroxybenzo[a]pyrene (glucuronide and/or
sulfate conjugates) were the majority forms in both biological
fluids, glucuronide 3-hydroxybenzo[a]pyrene being the main
metabolite in bile. The same research group, in a previous
study17 concerning food safety of commercial milk formulas
and infant cereals, reported that no hydroxy PAH metabolites
(1-hydroxypyrene and 3-hydroxybenzo[a]pyrene) or their
conjugates were detected in the analyzed foodstuffs.