“…HPLC with electrochemical detection is the most commonly used method for quantitative determination of biogenic amines and metabolites in tissue, plasma and urine (Cheng and Kuo, 1995;Chi et al, 1999;Davis et al, 1981;Gilinsky et al, 2001;Machida et al, 2006;Patel et al, 2005;Sabbioni et al, 2004;Sastre et al, 2004;Unceta et al, 2001). Another informative, but less used technique, for bioanalyte monitoring in tissue is capillary electrophoresis (CE) (Dillon and Sears, 1998;Markuszewski et al, 2003;Paxon et al, 2005;Qurishi et al, 2002;Shou et al, 2004).…”