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金属微量元素对氧化铁造影剂弛豫率的影响。

Impact of metallic trace elements on relaxivities of iron-oxide contrast agents.

作者信息

Ma Ji, Chen Kezheng

机构信息

Lab of Functional and Biomedical Nanomaterials, College of Materials Science and Engineering, Qingdao University of Science and Technology Qingdao 266042 China

出版信息

RSC Adv. 2019 Sep 30;9(53):30932-30936. doi: 10.1039/c9ra07227f. eCollection 2019 Sep 26.

DOI:10.1039/c9ra07227f
PMID:35529357
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9072193/
Abstract

In this work, well-defined 3 nm-sized Ca, Fe, Na, Mg, Zn, Ni, Co, and Cd cation-adsorbed FeO/γ-FeO nanoparticles were used as prototype systems to investigate the influence of metallic trace elements in body fluids on the relaxivities of iron-oxide contrast agents. It was found that surface-adsorbed cations formed a deterioration layer to induce pronounced relaxivity loss. Theoretical study showed that such relaxivity loss can be well described by a modified GCAS function, taking into account the harmonic cation oscillations around FeO/γ-FeO nanoparticles. Quantum mechanics analyses revealed that even-parity and odd-parity states of harmonic oscillations are dominant in and relaxivities, respectively. Moreover, the harmonic oscillations of Na and Mg cations around FeO/γ-FeO nanoparticles are found to be classical forbidden, which are quite different from their counterparts located in the classical permissive area.

摘要

在这项工作中，定义明确的3纳米大小的钙、铁、钠、镁、锌、镍、钴和镉阳离子吸附的FeO/γ-FeO纳米颗粒被用作原型系统，以研究体液中的金属微量元素对氧化铁造影剂弛豫率的影响。研究发现，表面吸附的阳离子形成了一个劣化层，导致弛豫率显著损失。理论研究表明，考虑到FeO/γ-FeO纳米颗粒周围阳离子的谐波振荡，这种弛豫率损失可以通过修正的GCAS函数很好地描述。量子力学分析表明，谐波振荡的偶宇称和奇宇称状态分别在纵向和横向弛豫率中占主导地位。此外，发现钠和镁阳离子在FeO/γ-FeO纳米颗粒周围的谐波振荡是经典禁戒的，这与它们位于经典允许区域的对应物有很大不同。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6487/9072193/8eb2532f5321/c9ra07227f-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6487/9072193/dc4f2b2aac57/c9ra07227f-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6487/9072193/8f469750e6f4/c9ra07227f-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6487/9072193/0cf351bd54c1/c9ra07227f-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6487/9072193/8eb2532f5321/c9ra07227f-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6487/9072193/dc4f2b2aac57/c9ra07227f-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6487/9072193/8f469750e6f4/c9ra07227f-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6487/9072193/0cf351bd54c1/c9ra07227f-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6487/9072193/8eb2532f5321/c9ra07227f-f4.jpg

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