کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1206329 1493734 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Post-column reactor of coaxial-gap mode for laser-induced fluorescence detection in capillary electrophoresis
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Post-column reactor of coaxial-gap mode for laser-induced fluorescence detection in capillary electrophoresis
چکیده انگلیسی
A post-column reactor with coaxial-gap mode is developed for laser-induced fluorescence detection (LIF) in capillary electrophoresis (CE). The reactor can be assembled simply and conveniently, in which a thin polyimide sleeve of 10-mm length obtained from the capillary coating is used to align separation and reaction capillary with a 20 μm gap. Naphthalene-2,3-dicarboxaldehyde and 2-mercaptoethanol are used as derivatization reagents and delivered into the reaction capillary through the annulus between the separation capillary and polyimide sleeve and the gap of two capillaries by gravity. A reaction distance from the gap to detection point is 5 mm. For the post-column reactor of CE-LIF, several configuration parameters are optimized, including liquid level difference between the derivatization solution and outlet buffer, annular dimension between the outer diameter of etched separation capillary and the inner diameter of polyimide sleeve, and reaction distance, etc. The detection limits in the range from 8.0 × 10−8 to 1.0 × 10−6 mol/L and linear calibration range more than two orders of magnitude are obtained for amino acids. The separation efficiency ranges from 1.35 × 105 to 1.67 × 105 theoretical plates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1171, Issues 1–2, 9 November 2007, Pages 133-139
نویسندگان
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