“…On the other hand, the SY and TT always coexist together to restore the yellow color, so the development of simultaneous determination method for them based on electrochemical technique is necessary (Gan et al, 2012). In recent years, different modified electrodes were developed for the electrochemical determination of SY and TT such as MWCNT modified GCE (Zhang, Liu, Zheng, Huang, & Wan, 2009), graphene/mesoporous TiO 2 composite-coated electrode (Gan, Sun, Meng, Song, & Zhang, 2013), graphene layer-wrapped phosphotungstic acid (PTA) hybrid modified GCE (Gan et al, 2012), and b-cyclodex trin/poly(diallyldimethylammonium chloride)/graphene composite modified GCE (Ye, Du, Lu, & Wang, 2013).…”