Highly sensitive electrochemical detection of methyl salicylate using electroactive gold nanoparticles.
Highly sensitive electrochemical detection of methyl salicylate using electroactive gold nanoparticles.
复制标题
使用电活性金纳米颗粒对水杨酸甲酯进行高灵敏电化学检测。
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
R. Ramasamy
中科院分区：
文献类型：
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作者：
Yogeswaran Umasankar;R. Ramasamy
利用纳米金修饰丝网印刷碳电极（SPCE）实现了水杨酸甲酯的电化学传感。研究了平面金电极、SPCE和AuNP-SPCE在碱性电解液中存在和不存在水杨酸甲酯时的电化学响应，以了解各种电化学反应的安培响应。反应机理包括水杨酸甲酯的水解和阴离子的氧化。电化学响应记录使用循环伏安法和差分脉冲伏安法技术，其中的结果显示水杨酸甲酯氧化的特征信号。在所研究的电极中，AuNP-SPCE具有比平面金高3倍的灵敏度，比SPCE高35倍的灵敏度（在0.5 V下）。AuNP-SPCE传感水杨酸甲酯的重复性变异系数<5%，即使多次使用（n = 8），一周的稳定性能也不超过15%的活性损失。即使存在高浓度的干扰化合物，如顺式-3-己烯醇，乙酸己酯和顺式-己烯基乙酸酯，AuNP-SPCE保留>95%的水杨酸甲酯的响应。大豆提取物的电分析结果表明，AuNP-SPCE可用于真实的样品中水杨酸甲酯的测定。
Electrochemical sensing of methyl salicylate, a key plant volatile has been achieved using a gold nanoparticle (AuNP) modified screen printed carbon electrode (SPCE). The electrochemical response of planar gold electrodes, SPCE and AuNP-SPCE in alkaline electrolyte in the presence and absence of methyl salicylate were studied to understand the amperometric response of various electrochemical reactions. The reaction mechanism includes hydrolysis of methyl salicylate and the oxidation of negative species. The electrochemical responses were recorded using cyclic voltammetry and differential pulse voltammetry techniques, where the results showed characteristic signals for methyl salicylate oxidation. Among the examined electrodes, AuNP-SPCE possessed three fold better sensitivity than planar gold and 35 times better sensitivity than SPCE (at 0.5 V). The methyl salicylate sensing by AuNP-SPCE possessed <5% variation coefficient for repeatability, one week of stable performance with no more than 15% activity loss even if used multiple times (n = 8). Even in the presence of high concentration of interfering compounds such as cis-3-hexenol, hexyl acetate and cis-hexenyl acetate, AuNP-SPCE retained >95% of its methyl salicylate response. The electroanalytical results of soybean extract showed that AuNP-SPCE can be employed for the determination of methyl salicylate in real samples.
影响因子：
11.4
作者：
Laothawornkitkul, Jullada;Moore, Jason P.;Paul, Nigel D.
通讯作者：
Paul, Nigel D.