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Updated: Jun 28, 2026

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通过分子翻转在接口处测量局部pH值:用于设计EPR活性pH敏感标签和探针的概念

Maxim A Voinov¹, Nicholas Nunn¹, Roshan Rana¹

¹Department of Chemistry, North Carolina State University, 2620 Yarbrough Drive, Raleigh, NC 27695, USA. tismirno@ncsu.edy.

Organic & biomolecular chemistry

|April 22, 2024

概括

这项研究引入了一种新的电子磁共振 (EPR) 方法,通过监测分子旋转动态的变化来检测pH值. 这种方法为生物界面,特别是脂质双层的pH测量提供了增强的灵敏度.

科学领域:

生物物理化学生物物理化学
分析化学分析化学
材料科学材料科学材料科学

背景情况:

目前的pH测量探头依赖于电子结构的变化,影响光,NMR或EPR磁性参数.
这些方法在复杂接口上的灵敏度或适用性可能是有限的.
了解局部质子化状态对于生物和化学系统至关重要.

研究的目的:

探索一种用于测量局部质子化状态的新概念,使用电子自旋轴承分子旋转动态的变化.
为了证明这个概念对生物界面的pH值测量的实用性,特别是脂质双层.
开发新的pH敏感氧化物和自旋标记的脂,以增强基于EPR的传感.

主要方法:

合成pH敏感的氧化物和自旋标记的脂.
在EPR光谱中引发的质子变化的表征,专注于超细合常量.
使用连续波X波段EPR测量旋转相关时间,用于二层脂质中的自旋标记脂质.

主要成果:

新合成的氧化物显示了轻微的变化 (约. 0.5 G) 在高精度合常数中,在质子化时.
脂质二层中的自旋标记脂体在质子化后的旋转相关时间显著增加了约6倍.
旋转动态的实质性变化使得从EPR光谱分析中轻松确定pKa.

结论:

电子自旋轴承部分的旋转动力学的变化为pH测量提供了基于EPR的敏感方法.
这种方法在生物界面上特别有效,如脂质双层,这是由于探针与环境的相互作用.
开发的氧化物结构扩大了基于EPR的pH传感工具包,跨越各种范围,帮助研究静电现象.

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