双磁芯/外纳米探针与可调节交换合,用于高分辨率和敏感磁粒子成像
Qilong Li1, Changjian Li2, Yueqi Wang3
1Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, School of Biomedical Engineering, National Center for Translational Medicine, Shanghai Jiao Tong University, Shanghai, 200240, China.
Angewandte Chemie (International ed. in English)
|October 31, 2024
概括
工程双磁芯/外纳米晶体 (BMCS) 显著提高磁粒子成像 (MPI) 的分辨率和灵敏度. 这一突破使得更精确的瘤成像和对结直肠癌等疾病的敏感检测成为可能.
科学领域:
- 生物医学工程 生物医学工程
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
背景情况:
- 磁粒子成像 (MPI) 提供了多种生物医学应用,包括瘤成像和细胞跟踪.
- 目前的MPI追踪器在分辨率和灵敏度方面存在局限性,这阻碍了临床翻译.
- 优化追踪器属性对于推进MPI功能至关重要.
研究的目的:
- 为了改进MPI性能,设计新的双磁核心/外纳米晶体 (BMCS).
- 通过优化的异构结构和交换合来提高MPI分辨率和灵敏度.
- 评估BMCS作为一种用于疾病检测的高性能MPI追踪器的有效性.
主要方法:
- 通过优化异构来设计和合成双磁核/外纳米晶体 (BMCS).
- 调节了BMCS内的磁组件之间的交换合效应.
- 与传统的追踪器相比,评估了MPI性能,包括信号强度,分辨率和灵敏度.
主要成果:
- BMCS表现出显著增加的易感性和磁化与低强制性.
- 与同等度的常规标记剂相比,BMCS显示信号强度增加了5.08倍.
- 实现了1毫米的前所未有的MPI分辨率,使得在小鼠中能够灵敏地检测正管结直肠癌.
结论:
- 设计的BMCS代表了MPI追踪器开发的重大进步.
- 在核心/外纳米结构中优化交换合是高性能MPI的有效策略.
- BMCS显示出高分辨率MPI和敏感的生物医学成像应用的巨大潜力.
相关概念视频
NMR Spectrometers: Resolution and Error Correction
674
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
674
Atomic Nuclei: Magnetic Resonance
634
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
634
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
263
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...
263
Double Resonance Techniques: Overview
191
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
191


