Highly sensitive simultaneous electrochemical determination of myricetin and rutin via solid phase extraction on a ternary Pt@r-GO@MWCNTs nanocomposite

Tursynbolat, Satar; Bakytkarim, Yrysgul; Huang, Jianzhi; Wang, Lishi

The CVs of bare GCE and Pt@r-GO@MWCNTs/GCE in 50 mM myricetin and 50 mM rutin solutions are shown in Fig. 4A . Unlike the bare GCE, two pairs of redox peaks of myricetin and rutin were clearly observed when the Pt@r-GO@MWCNTs/GCE was used along with a larger background current. Thus, the Pt@r-GO@MWCNTs nanocomposite showed a good electrocatalytic effect for detection of both myricetin and rutin. In addition, the DPV results shown in Fig. 4B for the bare GCE (I pa ¼ 4.617 mA, E pa ¼ 0.276 V for myricetin, and I pa ¼ 1.316 mA, E pa ¼ 0.432 V for rutin) provided very small current signals. Moreover, the potential differences were insufficient to realize the simultaneous determination of myricetin I pa ¼ 44.45 mA, E pa ¼ 0.320 V for myricetin, and I pa ¼ 51.71 mA, E pa ¼ 0.496 V for rutin), the oxidation peak current signals increased by a factors of 11 and 50 for myricetin and rutin, respectively, over that of the bare GCE. In addition, the potential differences became large enough for the simultaneous detection of myricetin and rutin. Therefore, the Pt@r-GO@MWCNTs/GCE sensor was successful used for the simultaneous determination of myricetin and rutin.