Nano-optofluidic detection of single viruses and nanoparticles.

Nano-optofluidic detection of single viruses and nanoparticles.
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DOI:
10.1021/nn901889v
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发表时间:
2010-03-23
期刊:
影响因子:
17.1
通讯作者:
Novotny L
Novotny L
中科院分区:
材料科学1区
文献类型:
--
作者:
Mitra A;Deutsch B;Ignatovich F;Dykes C;Novotny L

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病毒和纳米颗粒的可靠检测、大小测定和分选对于生物传感、环境监测和质量控制非常重要。在这里,我们介绍了一个光学检测方案的实时和无标记的检测和识别的单个病毒和较大的蛋白质。该方法利用纳米流体通道结合光学干涉测量。从单个病毒穿过一个固定的激光焦点的Elvinous散射光检测与差分外差干涉仪和所产生的信号允许单个病毒的特点是单独的。外差检测消除了由于不同的粒子轨迹的相位变化,从而提高了识别精度相比,标准的光学干涉。我们通过分辨各种大小的纳米颗粒,以及从混合物中检测和识别不同种类的人类病毒来证明我们方法的实用性。该检测系统可以很容易地集成到更大的纳米流体架构中用于实际应用。
The reliable detection, sizing and sorting of viruses and nanoparticles is important for biosensing, environmental monitoring, and quality control. Here we introduce an optical detection scheme for the real-time and label-free detection and recognition of single viruses and larger proteins. The method makes use of nanofluidic channels in combination with optical interferometry. Elastically scattered light from single viruses traversing a stationary laser focus is detected with a differential heterodyne interferometer and the resulting signal allows single viruses to be characterized individually. Heterodyne detection eliminates phase variations due to different particle trajectories, thus improving the recognition accuracy as compared to standard optical interferometry. We demonstrate the practicality of our approach by resolving nanoparticles of various sizes, and detecting and recognizing different species of human viruses from a mixture. The detection system can be readily integrated into larger nanofluidic architectures for practical applications.
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