Generation of benzo(а) pyrene produced in oil-tea camellia seed oil

The benzo(a)pyrene contents in crude oil-tea camellia seed oil from different producing area and processing ways were analyzed.The results showed that: before roasting it was necessary for coarse grinding.For oil-tea camellia seed,small particles was easily generated because of the exist of thin,crisp,lower water and oil content shell.But for oil-tea camellia seed kernel,small particles was less because of the high oil content of the kernel.In the roasting process,the large particles were roasted just right,and the small particles were scorched and carbonized,which induced the form of benzo(a)pyrene.When the roasted material was pressed,the benzo(a)pyrene was further increased because of high temperature and pressure in the oil press,which resulted in the exist of benzo(a)pyrene in the oil and cake.