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Achieving High Levels of NMR-Hyperpolarization in Aqueous Media With Minimal Catalyst Contamination via SABRE

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JournalChemistry : A European Journal
DateAccepted/In press - 13 Jun 2017
DateE-pub ahead of print - 13 Jun 2017
DatePublished (current) - 19 Jul 2017
Issue number44
Volume23
Number of pages6
Pages (from-to)10491–10495
Early online date13/06/17
Original languageEnglish

Abstract

Signal amplification by reversible exchange (SABRE) is shown to allow access to strongly enhanced 1H NMR signals in a range of substrates in aqueous media. In order to achieve this outcome phase-transfer-catalysis is exploited which leads to less than less than 1.5 x 10-6 mol dm-3 of the iridium catalyst in the aqueous phase. These observations reflect a compelling route to produce a saline based hyperpolarized bolus in just a few seconds for subsequent in vivo MRI monitoring. The new process has been called CAtalyst Separated Hyperpolarization via Signal Amplification By Reversible Exchange or CASH-SABRE. We illustrate this method for the substrates pyrazine, 5-methylpyrimidine, 4,6-d2-methyl nicotinate, 4,6-d2-nicotinamide and pyridazine achieving 1H signals gains of approximately 790-, 340-, 3000-, 260- and 380-fold per proton at 9.4 T at the time point where phase separation is complete.

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© 2017, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

    Research areas

  • Hyperpolarization, NMR spectroscopy, para-hydrogen, SABRE

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