(15)N Hyperpolarization of Imidazole-(15)N2 for Magnetic Resonance pH Sensing via SABRE-SHEATH.
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(15)N nuclear spins of imidazole-(15)N2 were hyperpolarized using NMR signal amplification by reversible exchange in shield enables alignment transfer to heteronuclei (SABRE-SHEATH). A (15)N NMR signal enhancement of ∼2000-fold at 9.4 T is reported using parahydrogen gas (∼50% para-) and ∼0.1 M imidazole-(15)N2 in methanol:aqueous buffer (∼1:1). Proton binding to a (15)N site of imidazole occurs at physiological pH (pKa ∼ 7.0), and the binding event changes the (15)N isotropic chemical shift by ∼30 ppm. These properties are ideal for in vivo pH sensing. Additionally, imidazoles have low toxicity and are readily incorporated into a wide range of biomolecules. (15)N-Imidazole SABRE-SHEATH hyperpolarization potentially enables pH sensing on scales ranging from peptide and protein molecules to living organisms.
Published Version (Please cite this version)10.1021/acssensors.6b00231
Publication InfoShchepin, RV; Barskiy, DA; Coffey, AM; Theis, Thomas; Shi, F; Warren, WS; ... Chekmenev, EY (2016). (15)N Hyperpolarization of Imidazole-(15)N2 for Magnetic Resonance pH Sensing via SABRE-SHEATH. ACS Sens, 1(6). pp. 640-644. 10.1021/acssensors.6b00231. Retrieved from https://hdl.handle.net/10161/15446.
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Assistant Research Professor of Chemistry
Theis' research is at the intersection of Spin Physics and Hyperpolarization Chemistry. It has applications in the study of biochemical dynamics and molecular imaging. The Theis lab drives innovation of magnetic resonance tools and techniques to break the sensitivity limits of NMR and MRI. The innovations enable i) biochemical structure elucidation with unprecedented limits of detection, and ii) molecular imaging to spy on mole