An automated system for fast transfer and injection of hyperpolarized solutions

Abstract

Dissolution dynamic nuclear polarization (dDNP) has become a hyperpolarization method of choice for enhancing nuclear magnetic resonance (NMR) signals. Nuclear spins are polarized in solid frozen samples (in a so-called polarizer) that are subsequently dissolved and transferred to an NMR spectrometer for high sensitivity detection. One of the critical challenges of dDNP is that it requires both a fast transfer to limit nuclear spin relaxation losses as well as stability to guarantee high resolution (no bubbles nor turbulences). Here we describe the design, construction and performances of such a transfer and injection system, that features a 5 m/s speed and sub-Hz spectral resolution upon arrival at the detection spot. We demonstrate the use of such a system for inter-magnet distances of up to 10 m.

Keywords

• NMR
• Hyperpolarization
• dDNP
• Dissolution
• Instrumentation
• Transfer