Selective Monitoring of Rutin and Quercetin based on a Novel Multi-wall Carbon Nanotube-coated Glassy Carbon Electrode Modified with Microbial Carbohydrates α-Cyclosophorohexadecaose and Succinoglycan Monomer M3

Multi-wall carbon nanotube (MWNT)-modified glassy carbon electrodes (GCE) were prepared for simultaneous determination of rutin and quercetin. Microbial carbohydrates, alpha-cyclosophorohexadecaose (alpha-C16) and succinoglycan monomer M3 (M3) were doped into MWNTs to prepare a alpha-C16-doped MWNT-modified GCE ((alpha-C16 + MWNTs)/GCE) and a M3-doped MWNT-modified GCE ((M3 + MWNTs)/GCE), respectively. The sensitivities of the (alpha-C16 + MWNTs)/GCE to rutin and quercetin were 34.7 mu A.mu M-1.cm(-2) and 18.3 mu A.mu M-1.cm(-2) respectively, in a linear range of 2 similar to 8 mu M at pH 7.2. The sensitivities of the (M3 + MWNTs)/GCE was 2.44 mu A.mu M-1.cm(-2) for rutin and 7.19 mu A.mu M-1.cm(-2) for quercetin without interference.