
第22卷第8期
2014年8月文章编号
1004-924X(2014)08-2159-07
光学精密工程
Optics and Precision Engineering
Vol. 22No.8
Aug.2014
微流控细胞芯片LED诱导透射式荧光检测微系统
顾雯雯1,2.
(1.西南大学工程技术学院,重庆400715;
2.重庆大学新型微纳器件与系统技术国家重点学科实验室,重庆400030)
摘要:构建了用于微流控细胞分析芯片的发光二极管(LED)诱导透射式荧光检测微系统,以克服现有荧光检测系统体积大、能耗高,以及激发光光路、检测区域和荧光收集光路间光学耦合效率低等间题。该系统的激发光光路和荧光收集光路互成135°,LED发出的激发光经透镜聚焦和激发光滤色片滤光后,经直径为200μm的小孔光限束,然后投射到微流控芯片通道末端的检测区域;产生的荧光及杂散光经加工后置于微流控芯片底部的发射光高通干涉滤色薄膜后,被光电倍增管收集。以HepG2肝瘤细胞为测试样本对该荧光检测微系统的有效性进行了评测,结果显示;当LED工作电流为200mA,PMT控制电压为3.5V时,可产生与背景噪声明显区分的峰值信号;用250s观测时间得到了8个平均峰高为07V的峰值信号,与荧光显微镜观察结果一致,实现了细胞的在线计数检测功能。提出的系统为新型微全细胞分析提供了一种新的技术途径。
关键词:荧光检测;发光二极管(LED);透射式光路;微流控芯片;细胞计数检测
中图分类号:TH744.5:TN312.8
文献标识码:A
doi.10.3788/OPE.20142208.2159
LEDinducedtransmittedfluorescencedetector
integrated inmicrofluidic cellchip
GU Wen-wenl2.
(1.CollegeofEngineeringandTechnology,SouthwestUniuersity,Chongqing400715,China;
2.NationalKeyLaboratory ofFundamentalScienceof Micro/NanoDevice and SystemTechnology,ChongqingUniversity,Chongqing400030,China)
+Correspondingauthor,E-mail:guww1983@163.com
Abstract: A transmitted fluorescence detector induced by a Light Emitting Diode(LED) was estab-lished for integrating in a microfluidic cell chip. The detector overcomes the problems of system bulky in larger size,higher energy consumption and low coupling efficiency for inducing optical path, detec tion zone and fluorescence optical path. The angle for induced fluorescence optical path was designed to be 135°. The exciting light produced by the LED passed through an optical lens, an exciting light filter and a diaphragm aperture with a diameter of 200 μm, and then reached the detection zone of mi-crofluidic chip. The induced fluorescence light and stray light passed through emitting high pass inter ference thin film filter fabricated at the back of the microfluidic chip, and finally was collected by a
收稿日期:2014-01-05;修订日期:2014-02-30,
基金项目:中央高校基本科研业务费专项基金资助项目(No.XDJK2013C011);西南大学科研基金博士基金资助项
目(No.SWU112050);重庆大学新型微纳器件与系统技术国家重点学科实验室访问学者基金资助项目(No,2013MS05)