Selective electrochemical detection of cysteine in complex serum by graphene nanoribbon.
Selective detection of cysteine in serum samples was achieved on a graphene nanoribbon (GNR) and Nafion nanocomposite modified electrode with high precision. The superior conductivity and abundant amount of active chemical oxygen groups on the edge of GNR led to extremely highly electrocatalytic activity of GNR towards the electrochemical oxidation of cysteine at +0.025 V. The electrocatalytic behavior was further used for sensitive detection of cysteine by differential pulse voltammetry. Under optimized conditions, the calibration curve was linear in the range from 25 nM to 500 μM. The electrochemical sensor showed strong antifouling ability, good stability and selectivity. It could effectively exclude the interferences from other kinds of biothiols and the biological relevant species, thus had great perspective for in vivo analysis of biological samples.
School of Chemistry, Dalian University of Technology, Dalian 116023, PR China. wushuo@dlut.edu.cn
Shuo
S
Wu
Xiaoqin
X
Lan
Feifei
F
Huang
Zhengzi
Z
Luo
Huangxian
H
Ju
Changgong
C
Meng
Chunying
C
Duan
D015374:Biosensing Techniques / Q000379:methods*; D003545:Cysteine / Q000097:blood*; D055664:Electrochemical Techniques / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D006801:Humans; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010084:Oxidation-Reduction; D012680:Sensitivity and Specificity
D037742:Nanotubes, Carbon; D006108:Graphite; D003545:Cysteine