کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9748928 | 1493796 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Integrated capillary electrophoresis amperometric detection microchip with replaceable microdisk working electrode
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
The interference of separation high voltage with the electrochemical detection is a major challenge to the microchip capillary electrophoresis-electrochemical detection systems with end-channel detection mode. Using dopamine and catechol as model analytes, the influences of channel cross-sectional area and channel-to-electrode distance on the high-voltage interference, accordingly on the separation and detection performances of the microchip capillary electrophoresis-electrochemical detection system were investigated. With the increase of the channel cross-sectional area from 312 through 450-615 μm2, the apparent half-wave potentials of hydrodynamic voltammetry for dopamine at the field strength of 288 V/cm shifted positively from 285 through 330-400 mV. By using a chip with the smallest channel cross-section (312 μm2 with top width of 37.3 μm and depth of 8.9 μm) the residual high-voltage field in the detection cell was small, so that detection was conducted at a channel-to-electrode distance of 20 μm to achieve better performances of separation and detection.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1080, Issue 2, 8 July 2005, Pages 192-198
Journal: Journal of Chromatography A - Volume 1080, Issue 2, 8 July 2005, Pages 192-198
نویسندگان
Yurong Wang, Hengwu Chen,