Functionalized 129Xe as a potential biosensor for membrane fluidity
文献信息
Matthias Schnurr, Christopher Witte, Leif Schröder
Using spin hyperpolarized xenon (129Xe) we investigate the impact of the local molecular environment on reversible host–guest interactions. We label Xe guest atoms that are temporarily bound to cryptophane-A hosts using the Hyper-CEST technique. By varying the length of the saturation pulse and utilizing an inverse Laplace transform we can determine depolarization times for the noble gas in different local environments, in this case biomembranes possessing different fluidity. We extend this technique to magnetic resonance imaging, mapping the spatial distribution of the different biomembranes. Such decays measured in biomembranes of 200 μM 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) were characterized by mono-exponential decays with time constants of τPOPC = 3.00+0.77−0.61 s and τDPPC = 22.15+5.19−4.16 s. Analyzing both environments simultaneously yielded a bi-exponential decay. This approach may give further insights into saturation transfer dynamics of reversibly bound Xe with applications extending into biomedical diagnostics.
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来源期刊
Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.










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