Improved long-term reproducibility for pulsed amperometric detection of carbohydrates via a new quadruple-potential waveform

被引:143
作者
Rocklin, RD [1 ]
Clarke, AP [1 ]
Weitzhandler, M [1 ]
机构
[1] Dionex Corp, Sunnyvale, CA 94088 USA
关键词
D O I
10.1021/ac970906w
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A new quadruple-potential waveform is introduced for detection of carbohydrates using pulsed amperometry. The new waveform cleans the electrode by application of a potential more negative than the potential limit. In contrast to a commonly used triple-potential waveform, negative cleaning allows the time during which gold oxide is formed to be minimized, thus minimizing the dissolution and resulting recession of the gold working electrode as a result of gold oxide formation/reduction cycles. Preventing gold electrode recession is shown to improve long-term reproducibility. Waveform parameters were chosen to maximize signal-to-noise ratio and freedom from electrode fouling caused by matrix components in the sample. Compared to the triple-potential waveform, the quadruple-potential waveform shows similar minimum detection limits but greatly improved long-term reproducibility.
引用
收藏
页码:1496 / 1501
页数:6
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