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适应器介导的能量接收器敏感化策略驱动反向双信号变化,用于构建高对比度升级转换纳米探针.

Wei Jia1,2, Xiaohui Kang1,2, Zhenzhen Xie1,2

  • 1Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.

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概括

这项研究引入了一种新的上转换纳米探针,使用阿普他默介导的能量转移进行高度敏感的检测. 新设计增强了信号对比度,克服了传统上转换纳米探针的局限性,以改善传感应用.

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科学领域:

  • 纳米技术和材料科学 材料科学
  • 分析化学和传感传感
  • 生物医学工程 生物医学工程

背景情况:

  • 上转换纳米探测器 (UCNPs) 提供低背景干扰和近红外激发感应.
  • 目前的UCNPs主要使用单个信号的发光共振能量转移 (LRET).
  • 在UCNP中,有限的LRET效率限制了信号对比度和灵敏度.

研究的目的:

  • 开发一种高度敏感的升级转换纳米探针,具有增强的信号对比度.
  • 为了引入一个aptamer介导的能量接受器敏感化策略,用于反向的双信号变化.
  • 为了证明纳米探针在检测微量Pb2+的有效性.

主要方法:

  • 通过将Cy3染料标记的aptamer与UCNP结合而制造纳米探针.
  • 在Pb2+结合时,利用阿普坦体的结构转变为G-四重复合体.
  • 从UCNP激活LRET到Cy3染料,导致发光灭和敏感化.

主要成果:

  • 纳米探测器表现出反向的双信号变化:灭绿色发光 (540 nm) 和敏感的Cy3光 (565 nm).
  • 使用540/565比率实现了Pb2+的低至51 pM的检测极限.
  • 该探测器在复杂样品中表现出高选择性,抗干扰能力和出色的性能.

结论:

  • 通过aptamer介导的能量受体敏感化策略有效地克服了UCNP中的信号对比度限制.
  • 这种多功能方法显著提高了上转换纳米探针的灵敏度.
  • 开发的纳米探针显示出在环境和农业样本中检测Pb2+等微量污染物的巨大前景.