通过CEST使用CoII2MRI探针进行比度pH成像
Agnes E Thorarinsdottir1, Kang Du1, James H P Collins2
1Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States.
Journal of the American Chemical Society
|October 14, 2017
概括
研究人员使用化学交换和转移 (CEST) 开发了一种基于2的新型探针用于比值pH成像. 这种双核过渡金属探测器提供了度独立的pH测量,对体内研究有希望.
科学领域:
- 无机化学
- 磁共振成像技术
- 生物医学传感
背景情况:
- 精确的pH监测对于了解生物过程至关重要.
- 现有的pH成像技术经常面临敏感性和度依赖性的挑战.
- 化学交换和转移 (CEST) 为检测化学环境提供了一种敏感的方法.
研究的目的:
- 开发一种基于二的新型磁共振 (MR) 探测器,用于比值pH量测和成像.
- 在生理条件下研究探针的pH敏感度和稳定性.
- 建立用于pH成像的双核过渡金属探针的设计策略.
主要方法:
- 用CEST活性连接物 (四氧化碳胺) 和基替代双酸盐合成稳定在空气和水中的CO2复合物.
- 可变pH CEST和核磁共振 (NMR) 分析以评估pH依赖的峰值强度.
- 通过将 CEST 峰值强度比与溶液 pH 相对应,构建一个线性校准曲线.
主要成果:
- 一个含有胺和氧联体的Co(II) 2复合体在生理范围 (6.5-7.6) 中表现出高pH敏感度 (0.99(7) pH单位-1).
- 在水性缓冲剂和胎儿牛血清中,pH校准曲线与度无关,且一致.
- 幻影图像显示线性pH行为,探测器表现出对常见离子的稳定性和良好的细胞活力.
结论:
- 双核过渡金属PARACET探针可以提供度独立的pH测量.
- 开发的Co(II) 2探针适用于比值pH成像,并有可能用于体内应用.
- 本研究提出了用于生理pH监测的先进MR探针的设计策略.
相关概念视频
pH
121.5K
The potential of hydrogen (pH) is a measure of the acidity or basicity of a water-based solution determined by the concentration of hydronium ions (H3O+). In one liter of pure water at neutral pH, there are 1×10−7 moles of hydronium ions. However, the extensive range of hydronium ion concentrations present in water-based solutions makes measuring pH in moles cumbersome. Therefore, a pH scale was developed to convert moles of hydronium ions into the negative logarithm of the hydronium...
121.5K
Calculating pH Changes in a Buffer Solution
47.2K
A buffer can prevent a sudden drop or increase in the pH of a solution after the addition of a strong acid or base up to its buffering capacity; however, such addition of a strong acid or base does result in the slight pH change of the solution. The small pH change can be calculated by determining the resulting change in the concentration of buffer components, i.e., a weak acid and its conjugate base or vice versa. The concentrations obtained using these stoichiometric calculations can be used...
47.2K
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
1.2K
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
1.2K


