用aptamer覆盖的纳米晶体量子点:一种用于无标签蛋白质检测的新方法
Jong Hyun Choi1, Kok Hao Chen, Michael S Strano
1Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
Journal of the American Chemical Society
|December 7, 2006
概括
用aptamer封顶的量子点 (QD) 提供快速,无标签的蛋白质检测. 这种新型生物传感器利用选择性电荷转移在复杂的生物样本中进行敏感的血栓鉴定.
科学领域:
- 生物医学工程 生物医学工程
- 纳米技术纳米技术
- 生物化学 生物化学
背景情况:
- 量子点 (QD) 是具有可调节光学特性的半导体纳米晶体.
- 体是短的DNA或RNA序列,可以结合到特定的目标.
- 开发敏感和选择性蛋白质检测方法对于诊断至关重要.
研究的目的:
- 开发一种用于蛋白质检测的新型生物传感器,使用aptamer功能化量子点.
- 为了研究光灭在蛋白质结合时的机制.
- 评估开发的基于QD的传感器的选择性和灵敏度.
主要方法:
- 合成水溶性,近红外辐射硫化 (PbS) 量子点 (QDs) 的合成.
- 用结血红素结合的阿巴体对QD进行功能化,保持其四重复结构.
- 使用光光谱学来观察火的QD-蛋白相互作用的表征.
- 在干扰蛋白质存在时检测极限和选择性的评估.
主要成果:
- 采用Aptamer封顶的PbS QDs在1050nm左右表现出光.
- 血栓素选择性结合到aptamer功能化的QDs导致光火.
- 凝血素检测在1分钟内实现,检测极限约为1nM.
- 传感器显示出高选择性,不受其他蛋白质高度的影响.
结论:
- 采用aptamer封顶的近红外PbS QDs可通过选择性电荷转移快速且无标签地检测目标蛋白.
- 该QD-aptamer复合体保持结构完整性,用于特定的血栓结合.
- 这项技术在复杂的生物矩阵中对敏感蛋白质测定具有前景.
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