“…Tetrahydro-β-carbolines and the fully aromatic oxidized form, Harman, have been extensively determined to occur naturally in many commercial foods such as fruit juices, soft drinks, fermented alcoholic beverages, fermented sauces, vinegar, meats, fish, cheese, yogurt, toasted bread, and coffee (Sen et al, 1995;Herraiz and Sanchez, 1997;Herraiz, 2000aHerraiz, ,b,c, 2002Herraiz and Galisteo, 2002;Pfau and Skog, 2004). High temperature cooking applications associated with Maillard chemistry, such as smoking, grilling, and frying of foods, have been shown to augment the formation of β-carbolines (Herraiz and Papavergou, 2004;Louis et al, 2007;Kim and Lee, 2010;Dong et al, 2011). Smoked foods accumulate greater amounts of β-carbolines, presumably caused by a reaction between the formaldehyde present in smoke and tryptophan (Papavergou and Herraiz, 2003).…”