L-半胱氨酸电分析.pdfVIP

Microchim Acta (2008) 162: 219–225 DOI 10.1007/s00604-008-0940-2 Printed in The Netherlands Original Paper Electrocatalytic oxidation and sensitive determination of L-cysteine at a poly(aminoquinone)-carbon nanotubes hybrid film modified glassy carbon electrode 1;2 1 1 1 1 Xinman Tu , Qingji Xie , Zhao Huang , Xue’en Jia , Min Ye 1 Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research of the Ministry of Education of China, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, P.R. China 2 School of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang, P.R. China Received 29 September 2007; Accepted 3 January 2008; Published online 25 February 2008 # Springer-Verlag 2008 Abstract. Poly(aminoquinone) (PAQ) was synthesized even better when cured with curing agents like diep- through iodate-oxidation=Michael addition reaction oxides and isocyanates [9]. However, the PAQ materi- of 1,2-dihydroxybenzene with 4,40 -methylenedianiline als probably with electrochemical activity have hardly and characterized with SEM, FT-IR and UV-Vis been investigated for biosensing applications to date. techniques. The PAQ-multiwalled carbon nanotubes Recently, we synthesized a PAQ-multiwalled carbon (MWCNTs) hybrid film modified glassy carbon (GC) nanotubes (MWCNTs) composite from precursors of electrode showed well-defined redox peaks of the qui- 1,2-dihydroxybenzene and o-phenylenediamine in none groups of the polymer, which effectively med- the presence of MWCNTs, and the PAQ-MWCNTs iated the oxidation of L-cysteine (CySH) in a pH 7.0 composite modified electrode could be applied to ef- phosphate buffer, with an overpo