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用于生物分子局部捕获和检测的量子点生物共轭物阵列的微接触印刷。

Microcontact printing of quantum dot bioconjugate arrays for localized capture and detection of biomolecules.

作者信息

Pattani Varun P, Li Chunfei, Desai Tejal A, Vu Tania Q

机构信息

Department of Biomedical Engineering, Oregon Health & Sciences University, 3303 SW Bond Avenue, 13B, Portland, OR, 97239, USA.

出版信息

Biomed Microdevices. 2008 Jun;10(3):367-74. doi: 10.1007/s10544-007-9144-5.

Abstract

The nanometer size scale of quantum dots (QDs) along with their unique luminescent properties offers great potential as photostable, color-metrically addressable nanoparticle platforms for high-throughput detection and identification of proteins. Here we apply microcontact printing for assembling quantum dot nanoparticle arrays with retained biomolecular capture functionality onto glass surfaces. This method allows the creation of addressable QD arrays on macroscopic glass surfaces. Using fluorescence and AFM imaging, we find that microcontact-printed QDs self-assemble predominantly as monolayers with highly resolved definition. Microcontact-printed streptavidin-conjugated red QDs exhibit retained adsorption onto silane-treated glass and exhibit functionality as demonstrated by the capture of discrete groups of biotin-conjugated red QDs by printed streptavidin-green QD bioconjugates that is at the detection limit of a few discrete protein binding events. These results indicate that microcontact printing of QD bioconjugate arrays serves as a simple technique that allows localized spatial capture and sensitive detection of proteins. This technique may be useful for development of future fluorescent QD-based systems aimed at the parallel capture and detection of trace concentrations of protein.

摘要

量子点(QD)的纳米尺寸及其独特的发光特性,使其作为用于高通量蛋白质检测和鉴定的光稳定、可进行颜色计量寻址的纳米颗粒平台具有巨大潜力。在此,我们应用微接触印刷技术,将具有保留生物分子捕获功能的量子点纳米颗粒阵列组装到玻璃表面。该方法能够在宏观玻璃表面创建可寻址的量子点阵列。通过荧光和原子力显微镜成像,我们发现微接触印刷的量子点主要以高度清晰的单层形式自组装。微接触印刷的链霉亲和素共轭红色量子点在硅烷处理的玻璃上表现出保留的吸附能力,并通过印刷的链霉亲和素 - 绿色量子点生物共轭物捕获离散的生物素共轭红色量子点群展示出功能,这处于少数离散蛋白质结合事件的检测极限。这些结果表明,量子点生物共轭物阵列的微接触印刷是一种简单技术,可实现蛋白质的局部空间捕获和灵敏检测。该技术可能有助于未来基于荧光量子点的系统的开发,旨在并行捕获和检测痕量浓度的蛋白质。

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