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题名: A glycerol assisted light-emitting diode-induced fluorescence detector for capillary flow systems
作者: Xu, Jing1;  Chen, Shiheng1;  Xiong, Yan1;  Yang, Bingcheng1;  Guan, Yafeng1
关键词: light-emitting diode ;  fluorescence detection ;  capillary electrophoresis ;  fefractive index matching fluid
刊名: TALANTA
发表日期: 2008-05-30
DOI: 10.1016/j.talanta.2007.11.064
卷: 75, 期:4, 页:885-889
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical
研究领域[WOS]: Chemistry
英文摘要: A glycerol assisted light-emitting diode (LED)-induced fluorescence detector (IF) for capillary flow systems was constructed and evaluated. A blue LED was used as the excitation source, and optical fibers (OF) were used to transmit the excitation light and collect the fluorescence. A commercial available 5-port manifold was used as detection cell, where the capillary tube and the OF were fixed into the manifold. The precision of the holes on the manifold ensured a self-alignment of optical path. A refractive index matching fluid (RIMF)-glycerol was used to eliminate the interfaces between the OF and the LED, as well as between the fused silica capillary and the transmitting/collecting fiber. The enhancement of excitation light led to 2.8-folds improvement on the signal-to-noise ratio. The use of RIMF also eliminates focusing effect of the capillary wall and reduces both the excitation light directed to the detection cell and background signal, resulting in reduction in the fluorescence intensity and noise level. The intensity was reduced to 47-63% for laser and 60-77% for LED, respectively, for capillaries with i.d. from 50 to 250 mu m; while the noise level was reduced to 1/3 when RIMF was used for both laser and LED on the tested capillaries. About 5.6-fold enhancement in signal-to-noise ratio was obtained in total. The detection limit of the LED-IF for fluorescein isothiocyanate (FITC) was 4 nM. Application of the LED-IF for the analysis of FITC-labeled amino acids by electrophoresis was demonstrated. (c) 2008 Elsevier B.V. All rights reserved.
关键词[WOS]: ELECTROPHORESIS SYSTEM ;  ARRAY ELECTROPHORESIS ;  INJECTION ;  CELL ;  SAMPLE
语种: 英语
WOS记录号: WOS:000256208200003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140976
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dept Analyt Chem & Microinstrumentat, Dalian 116023, Peoples R China

Recommended Citation:
Xu, Jing,Chen, Shiheng,Xiong, Yan,et al. A glycerol assisted light-emitting diode-induced fluorescence detector for capillary flow systems[J]. TALANTA,2008,75(4):885-889.
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