Hyperpolarized 15 N-pyridine Derivatives as pH-Sensitive MRI Agents

Weina Jiang, Lloyd Lumata, Wei Chen, Shanrong Zhang, Zoltan Kovacs, A. Dean Sherry, Chalermchai Khemtong

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Abstract

Highly sensitive MR imaging agents that can accurately and rapidly monitor changes in pH would have diagnostic and prognostic value for many diseases. Here, we report an investigation of hyperpolarized 15 N-pyridine derivatives as ultrasensitive pH-sensitive imaging probes. These molecules are easily polarized to high levels using standard dynamic nuclear polarization (DNP) techniques and their 15 N chemical shifts were found to be highly sensitive to pH. These probes displayed sharp 15 N resonances and large differences in chemical shifts (Δδ >90 ppm) between their free base and protonated forms. These favorable features make these agents highly suitable candidates for the detection of small changes in tissue pH near physiological values.

Original languageEnglish (US)
Article number9104
JournalScientific reports
Volume5
DOIs
StatePublished - Mar 16 2015

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