A ratiometric NMR pH sensing strategy based on a slow-proton-exchange (SPE) mechanism.

ABSTRACT: Real time and non-invasive detection of pH in live biological systems is crucial for understanding the physiological role of acid-base homeostasis and for detecting pathological conditions associated with pH imbalance. One method to achieve in vivo pH monitoring is NMR. Conventional NMR methods, however, mainly utilize molecular sensors displaying pH-dependent chemical shift changes, which are vulnerable to multiple pH-independent factors. Here, we present a novel ratiometric strategy for sensitive and accurate pH sensing based on a small synthetic molecule, SPE1, which exhibits exceptionally slow proton exchange on the NMR time scale. Each protonation state of the sensor displays distinct NMR signals and the ratio of these signals affords precise pH values. In contrast to st

SUBMITTER: Perruchoud LH 

PROVIDER: S-EPMC6054103 | biostudies-literature | 2015 Nov

REPOSITORIES: biostudies-literature