Compact, high performance surface plasmon resonance imaging system

被引:54
作者
Chinowsky, Timothy M. [1 ]
Grow, Michael S. [1 ]
Johnston, Kyle S. [1 ]
Nelson, Kjell [1 ]
Edwards, Thayne [1 ]
Fu, Elain [1 ]
Yager, Paul [1 ]
机构
[1] Univ Washington, Dept Bioengn, Seattle, WA 98195 USA
关键词
surface plasmon resonance imaging; microfluidics;
D O I
10.1016/j.bios.2006.10.030
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
We report the construction and characterization of a new compact surface plasmon resonance imaging instrument. Surface plasmon resonance imaging is a versatile technique for detection, quantification and visualization of biomolecular binding events which have spatial structure. The imager uses a folded light path, wide-field optics and a tilted detector to implement a high performance optical system in a volume 7 in. x 4 in. x 2 in. A bright diode light source and an image detector with fast frame rate and integrated digital signal processor enable real-time averaging of multiple images for improved signal-to-noise ratio. Operating angle of the imager is adjusted by linear translation of the light source. Imager performance is illustrated using resolution test targets, refractive index test solutions, and competition assays for the antiepileptic drug phenytoin. Microfluidic flowcells are used to enable simultaneous assay of three sample streams. Noise level of refractive index measurements was found to decrease proportional to the square root of the number of pixels averaged, reaching approximately 5 x 10(-7) refractive index units root-mean-square for 160 x 120 pixels image regions imaged for 1 s. The simple, compact construction and high performance of the imager will allow the device to be readily applied to a wide range of applications. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:2208 / 2215
页数:8
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