Multi-wall carbon nanotube-based electrochemical sensor for sensitive determination of Sudan I

作者：Gan Tian; Li Kai; Wu Kangbing^*

来源：Sensors and Actuators B: Chemical , 2008, 132(1): 134-139.

DOI：10.1016/j.snb.2008.01.013

• Sudan dyes
• electrochemical determination
• carbon nanotube
• food analysis

Herein, an electrochemical sensor for sensitive and convenient determination of Sudan I was developed based on the multi-wall carbon nanotube (MWNT) thin film-modified electrode. Owing to the unique properties of MWNT such as huge surface area, strong adsorptive ability, subtle electronic proper-ties and catalytic ability, the electrochemical oxidation signal of Sudan I significantly increases at the MWNT-based electrochemical sensor, suggesting that NWNT film exhibits obvious enhancement effect to the determination of Sudan I. Based on this, a sensitive and convenient electrochemical method was developed for the determination of Sudan L The linear range is over the range from 0.01 mg L(-1) (4.03 x 10(-8) mol L(-1)) to 1.0 mg L(-1) (4.03 x 10(-6) mol L(-1)), and the limit of detection is 5.0 mu g L(-1) (2.01 x 10(-8) mol L(-1)) after 3-min accumulation. Finally, this sensor was successfully employed to detect Sudan I in some hot chili samples.

• 出版日期2008-5-28
• 单位华中科技大学; 湖北民族大学