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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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相关实验视频

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Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles
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目标触发多极性可切换多重复合的光电化学平台

Zi-Long Ma1, Jia-Jie Chen2, Xu-Fei Sun1

  • 1Key Laboratory of Chemistry and Engineering of Forest Products, State Ethnic Affairs Commission; Guangxi Key Laboratory of Chemistry and Engineering of Forest Products; Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products; Laboratory of Optic-electric Chemo/Biosensing and Molecular Recognition, Education Department of Guangxi Zhuang Autonomous Region. School of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning 530006, China.

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概括

这项研究引入了一种新的光电化学 (PEC) 传感器,用于同时检测疾病生物标志物. 创新的极性切换模式使社区查能够进行敏感和准确的多目标量化.

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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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科学领域:

  • 电化学 电化学 电化学
  • 生物感应是一种生物感应.
  • 纳米技术纳米技术

背景情况:

  • 精确量化多种疾病生物标志物对于有效的社区查至关重要.
  • 光电化学 (PEC) 传感器提供了敏感检测的潜力,但使用极性切换模式连续多目标检测的研究是有限的.

研究的目的:

  • 开发一种使用目标触发的"阳极-阴极-阳极"极性切换模式同时检测多个分析物的多重PEC生物试验.
  • 用microRNA-21 (miRNA-21) 和microRNA-141 (miRNA-141) 作为模型目标来证明传感器的能力.
  • 为了提高传感器的实用性和可负担性,以社区为基础的疾病查.

主要方法:

  • 一个多重 PEC 生物试验的设计是基于由目标结合触发的"阳极-阴极-阳极"极性切换机制.
  • 特定的光敏感材料组合 (Cu2O/黄金纳米粒子/TiO2和CdS/黄金纳米粒子/TiO2) 使用胡须DNA和DNA环结构组装.
  • 传感器内置了一个电容器和一个多度计-智能手机连接,以简化组装和降低成本.

主要成果:

  • 该PEC传感器实现了miRNA-21和miRNA-141的敏感和选择性量化.
  • 对miRNA-21和miRNA-141都观察到从0.01 fM到10 nM的线性检测范围.
  • 实现了超低的检测极限:miRNA-21的3.2 aM和miRNA-141的4.3 aM.
  • 极性切换模式有效地减少了干扰,并使高灵敏度检测成为可能.

结论:

  • 开发的目标触发多极性切换PEC生物测试可使多种疾病生物标志物的敏感和准确的同时检测.
  • 传感器设计可以通过修改DNA结构和光敏感材料来适应检测其他多重目标.
  • 这种方法对经济高效且方便的社区疾病查具有重大前景.