Parahydrogen‐Induced Polarization of Diethyl Ether Anesthetic
Abstract
The growing interest in magnetic resonance imaging (MRI) for assessing regional lung function relies on the use of nuclear spin hyperpolarized gas as a contrast agent. The long gas‐phase lifetimes of hyperpolarized 129Xe make this inhalable contrast agent acceptable for clinical research today despite limitations such as high cost, low throughput of production and challenges of 129Xe imaging on clinical MRI scanners, which are normally equipped with proton detection only. We report on low‐cost and high‐throughput preparation of proton‐hyperpolarized diethyl ether, which can be potentially employed for pulmonary imaging with a nontoxic, simple, and sensitive overall strategy using proton detection commonly available on all clinical MRI scanners. Diethyl ether is hyperpolarized by pairwise parahydrogen addition to vinyl ethyl ether and characterized by 1H NMR spectroscopy. Proton polarization levels exceeding 8 % are achieved at near complete chemical conversion within seconds, causing the activation of radio amplification by stimulated emission radiation (RASER) throughout detection. Although gas‐phase T1 relaxation of hyperpolarized diethyl ether (at partial pressure of 0.5 bar) is very efficient, with T1 of ca. 1.2 second, we demonstrate that, at low magnetic fields, the use of long‐lived singlet states created via pairwise parahydrogen addition extends the relaxation decay by approximately threefold, paving the way to bioimaging applications and beyond.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 17, 2020
- Source ID
- 10.1002/chem.202002528
Entities
People
- Baptiste Joalland
- Eduard Y. Chekmenev
- Hassan R. Younes
- Igor Koptyug
- Juri Gelovani
- Kirill V. Kovtunov
- Larisa Kovtunova
- Nikita Chukanov
- Nuwandi M Ariyasingha
- Oleg Salnikov
- Valery Bukhtiyarov
Organizations
- Congressionally Directed Medical Research Programs
- International Tomography Center
- National Science Foundation Directorate for Mathematical & Physical Sciences
- Novosibirsk State University
- Russian Academy of Sciences
- Russian Center for Science Information
- Russian Science Foundation
- Siberian Branch of the Russian Academy of Sciences
- United Arab Emirates University
- Wayne State University