Keywords: 1-OHP; 1-hydroxypyrene; 2-NAPH; 2-naphthol; 8-OHdG; 8-hydroxy-2â²-deoxyguanosine; CV; coefficient of variation; ELISA; enzyme-linked immunosorbent assay; GM; geometric mean; GSD; geometric standard deviation; HPLC; high performance liquid chromatography;