Wang Peng, Hu Xiaozhong, Cheng Qin, Zhao Xiaoya, Fu Xiaofang, Wu Kangbing
Technology Center, Hubei Entry-Exit Inspection and Quarantine Bureau, Wuhan 430022, China.
J Agric Food Chem. 2010 Dec 8;58(23):12112-6. doi: 10.1021/jf103263p. Epub 2010 Nov 9.
Amaranth is widely added to food and can cause many adverse health effects when it is excessively consumed. Therefore, the monitoring of amaranth is quite important. Herein, an electrochemical sensor for the sensitive and rapid detection of amaranth was reported using multiwall carbon nanotube (MWNT) as the sensing film. Due to the large surface area and high accumulation efficiency, the MWNT sensor showed a strong enhancement effect on the oxidation of amaranth, and greatly increased the current signal. The detection conditions such as pH value, amount of MWNT, accumulation potential and time were optimized. The linear range is from 40 nM to 0.8 μM, and the limit of detection is 35 nM. Finally, the new sensor was successfully employed to detect amaranth in soft drinks, and the results were tested by high-performance liquid chromatography.
苋菜被广泛添加到食品中，过量食用会对健康造成许多不良影响。因此，对苋菜的监测非常重要。在此，报道了一种以多壁碳纳米管（MWNT）为传感膜的用于灵敏快速检测苋菜的电化学传感器。由于具有大的表面积和高的富集效率，MWNT传感器对苋菜的氧化表现出强烈的增强作用，并大大增加了电流信号。对pH值、MWNT用量、富集电位和时间等检测条件进行了优化。线性范围为40 nM至0.8 μM，检测限为35 nM。最后，该新型传感器成功用于检测软饮料中的苋菜，结果通过高效液相色谱法进行了验证。
