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荧光分子传感器信号输出方式

荧光分子传感器信号输出方式. 商贵芹 200425033. 荧光分子传感器的组成 传感器设计 荧光信号输出方式: 比色荧光 荧光强度的变化 荧光光谱移动 比率荧光. 主要内容:. excimer or exciplex FRET EIPT ICT. 荧光分子传感器的基本组成:. A Fluorescent Chromophore. A Binding Unit. A Suitable Linker. Target. Substrares.

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荧光分子传感器信号输出方式

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  1. 荧光分子传感器信号输出方式 商贵芹 200425033

  2. 荧光分子传感器的组成 传感器设计 荧光信号输出方式: 比色荧光 荧光强度的变化 荧光光谱移动 比率荧光 主要内容: excimer or exciplex FRET EIPT ICT

  3. 荧光分子传感器的基本组成: A Fluorescent Chromophore A Binding Unit A Suitable Linker Target Substrares Tetrahedron Letters 45 (2004) 1659-1662

  4. 传感器设计: 如图: 共价连接 指示剂 兼职形式

  5. 荧光增强 (1)在原来峰位置增强 (2)出现新峰且荧光增强(ICT、FRET、EIPT等 ) (3)荧光回升(常见的stop PET、FRET) Org. Lett. 2005; 7(1); 87-90 荧光减弱或猝灭 (1)重原子效应 (2)PET (3)FRET Sci.Technol.12. (2001 R53.) Org. Lett.;2003; 5(12); 2083-2086 荧光强度的变化:

  6. ICT引起的光谱移动: Donor Acceptor LUMO HOMO ICT:实质是一种分子内近距离的共轭电子云的偏移

  7. ICT引起的光谱移动: Donor :HOMO Donor :HOMO Donor :HOMO Acceptor:LUMO Acceptor:LUMO Acceptor:LUMO J. Am. Chem. Soc.2005; 127(12); 4124-4125.

  8. 小结: 单一依靠单波长荧光强度或光谱变化的分子传感器的缺点: (1)易受一些难以定量的可变性因素干扰 例如:光漂白、传感分子浓度、微环境(极性、 PH、温度、 仪器、操作人员等) (2)难以实现精确测定 J. Am. Chem. Soc.; 2002; 124(8); 1653-1657. Org. Lett.; 2005; 7(5); 889-892

  9. 比率荧光: 同时记录两峰位的波长下If值并计算If,入1/ If,入2的值从而获得比单波长传感更准确的数据. Chem.Eur.J.2003,9,No.7 1479-1485 比率荧光的优点 常见的几种比率荧光

  10. 比率荧光的优点: • 克服了以上所述的缺点 • 能获得较精确的数据,甚至使精确定量成为可能 • 对外部环境及内部微环境可以进行内校正 • 更高的选择性和灵敏度 J. Am. Chem. Soc.; 2002; 124(8); 1653-1657. Org. Lett.; 2005; 7(5); 889-892

  11. 常见的几种比率荧光: • 目标物种结合诱导的monomer -excimer • ICT引起光谱移动的比率荧光 • FRET引起光谱移动的比率荧光 • 两传感分子连用的比率荧光 • PET引起的比率荧光 • EIPT引起的比率荧光 • 其它… J. Am. Chem. Soc.;2003,125;8666-8671 Org.lett.Vol.5,No.15,2003,2667-2670 Chem.Eur.J.200410,3015-3025 J. Am. Chem. Soc.; 2000; 122(1); 174-175. J. Am. Chem. Soc.; 2003;125;11458-11459 J. Am. Chem. Soc.; 2003;125;16174-16175

  12. monomer -excimer 型 传感P2O74- 芘 J. Am. Chem. Soc.1999; 121(40); 9463-9464.

  13. J. Am. Chem. Soc. 2003; 125(10); 2884-2885. 传感Ag+: 传感H2PO4-: Org.Lett.,Vol.4,No.4,2002;561-564

  14. 基于ICT型: Cu Cu Org. Lett.; (Communication); 2005; 7(5); 889-892.

  15. 其它例子: 传感氟离子: R= Sensors and Actuators B 104 (2005) 103–110 Tetrahedron 60 (2004) 11109–11115

  16. FRET引起光谱移动的比率荧光:J. Am. Chem. Soc. 2002; 124(8); 1653-1657. 香豆素:Donor 荧光素:Accetor 磷酸二酶酯

  17. 对时间的光谱响应图:

  18. FRET引起的比率荧光其它文献: • Nature,1997,338,882-887 • Science.1998,279,84-88 • J.Am.Chem.Soc.2002,124,14286-14287 • Chem.Eur.J.2003,9,N.7 1479-1495

  19. 两传感分子连用的比率荧光:J. Am. Chem. Soc.; 2005; 127(6); 1612-1613.  

  20. The sensor system must meet the following criteria: • Both 1 and 2 must show marked change in fluorescence upon complexation of Cd2+ • ligands 1 and 2 must form 1:1 complexes with each of the metal ions • the binding affinity of 1 toward Cd2+ and Cu2+ has to be at least 2 orders of magnitude superior to that of 2 • in an analogous manner, 1 should bind Cu2+ better than Cd2+ for the system to achieve a reliable discrimination between “on” and “off” states

  21. 传感Cu2+的分子及谱图:

  22. 总结: 荧光分子传感器以其独特的优点吸引了众多分析科学家的注意,而且取得了显著的成绩。 但是,就目前的发展和研究来看,由于大部分分子传感器缺乏水溶性或者其激发波长局限在紫外区,因而失去了其在生物领域的应用,使其实用价值大大降低。这将成为以后我们努力的方向。

  23. Thank you for your attention!

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