“…This method is believed to be an accurate method for screening for total MCs because it can measure MMPB derived from the unusual C 20 amino acid, -amino acid (2S, 3S, 8S, 9S)-3-amino-9-methoxy-2, 6, 8-trimethyl-10-phenyldeca-4, 6-dienoic acid (Adda), which is a common constituent moiety of MCs [7]. Oxidizing toxins using the Lemieux oxidation method [33][34][35][36][37] have been widely used as a highly sensitive method for the detection of total MCs in a wide range of sample matrices, including cyanobacteria [38,39], animal tissues [40][41][42][43][44] and serum samples [45][46][47]. However, no studies have been conducted to evaluate the influence of reaction conditions on the formation of MMPB during the oxidation of MCs using permanganate-periodate.…”