Natural abundance 14C content of dibutyl phthalate (DBP) from three marine algae

Analysis of the natural abundance C-14 content of dibutyl phthalate (DBP) from two edible brown algae, Undaria pinnatifida and Laminaria japonica, and a green alga, Ulva sp., revealed that the DBP was naturally produced. The natural abundance C-14 content of di-(2-ethylhexyl) phthalate (DEHP) obtained from the same algae was about 50-80% of the standard sample and the C-14 content of the petrochemical (industrial) products of DBP and DEHP were below the detection limit.