一种新型微通道分析系统——发光二极管诱导荧光检测器

报道了一种新型发光二极管诱导荧光检测器。该系统采用共线性光学结构、通过柱上检测可与微通道分析系统在线联用。以异硫氰酸荧光素(FITC)及其标记的氨基酸为标样、结合毛细管电泳和流动注射技术评价了该系统。对FITC标记的苯丙氨酸浓度检测限为10-8 mol·L-1(柱上检测，0.05 mm内径)，在1×10-7～2×10-5 mol·L-1有很好的线性关系(r2 =0.999)，6次连续进样所得峰高值相对标准偏差(RSD)小于3 %。

A Novel Light-Emitting Diode-Induced Fluorescence Detector for Micro-Scale Flow Analysis System

A compact light-emitting diode-induced fluorescence detector based on collinear scheme is described. The detector was assembled by all-solid-state optical-electronic components and easily coupled with micro-scale flow analysis system by on-column detection mode. Fluorescein isothiocyanate (FITC) and FITC-labeled amino acids were used as test analytes to evaluate the detector performance by capillary electrophoresis and flow injection analysis techniques. The concentration limit of detection was 10(-8) mol x L(-1) for FITC-labeled phenylalanine at a signal-to-noise ratio (S/N) of 3 (on-column, 0.05 mm i.d.). The system exhibited a good linear response in the range of 1 x 10(-7) -2 x 10(-5) mol x L(-1) (r2 = 0.999). The relative standard deviation (RSD) of 6 repetitive injections on peak heights is less than 3%.