Heterocyclic amin heterocyclic amines HCAs PHIP and HCAs PHIP and HCAs PHIP and HCAs PHIP and HCAs Heterocyclic Amines PHIP and HCAs PHIP and HCAs heterocyclic amines HCAs Heterocyclic amine formation in meat 異環胺 (Heterocyclic amine, HCA)