“…Therefore, its determination in biological samples such as blood, urine, and serum are great importance because the results of analyses provide information about long-term abuse and can also be used for forensic purposes 2-6 . To date, a number of studies have been performed including high performance liquid chromatography 7,8 , spectrophotometry 9 , electrochemiluminescence 10 , gas chromatography 11 and electrochemical methods [12][13][14] for quantitative analysis of TRH from drugs, biological fluids, environmental water samples. Electrochemical methods, one of these methods, provide not only benefits such as speed, precision, selectivity and cost compliance for chemical analysis, but also provide useful information about the oxido-reduction mechanism of the corresponding electroactive species.…”