光氧传感器具有树突保护和两光子吸收天线
Raymond P Briñas1, Thomas Troxler, Robin M Hochstrasser
1Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Journal of the American Chemical Society
|August 18, 2005
概括
研究人员开发了一种用于3D成像的新氧纳米传感器. 这种传感器使用天线合色氨酸来增强两光子吸收 (2PA) 诱导的光,改善生物氧测量.
科学领域:
- 生物医学工程 生物医学工程
- 摄影化学的使用.
- 材料科学 材料科学 材料科学
背景情况:
- 亚微米3D氧气成像需要先进的光技术.
- 传统的素,如Pt和Pd氨酸,具有低的二光子吸收 (2PA) 截面,限制了它们在多光子显微镜中的使用.
- 对于生物应用来说,需要增强氧气传感器.
研究的目的:
- 设计和合成一种用于氧气检测的新型纳米传感器.
- 为了放大二光子吸收 (2PA) 诱导金属氨酸的光,以改善成像.
- 开发一种水溶性,生物相容的传感器,用于生物氧测量.
主要方法:
- 设计了一种纳米传感器,采用2PA吸收天线,并通过分子内能量转移 (ET) 与色素核相结合.
- 合成的多功能性Pt氨酸衍生物和基于Pt氨酸-氨酸的传感器.
- 利用树突封装进行保护,控制氧气扩散和水溶性.
- 研究了合成传感器的光物理特性.
主要成果:
- 设计的纳米传感器有效地放大2PA诱导的光.
- 据证实,天线核心的能量传输 (ET) 机制是有效的.
- 传感器表现出强烈的近红外辐射,对氧气敏感.
- 树突外套提供了保护和水溶性.
结论:
- 开发的基于Pt氨酸的纳米传感器是生物组织中高分辨率3D氧气成像的一个有前途的工具.
- 天线-ET战略有效地克服了传统光器中低2PA截面的局限性.
- 这种方法使生物系统中氧气的增强多光子成像成为可能.
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