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• W1973060067 abstract "NMR spectroscopy is a powerful tool for detection and characterization of chemical compounds in biological systems. Its application in pharmaceutical studies in cell cultures, however, has been hampered by the enormous technical challenges in separating intra- from extracellular amounts of one substance. We introduce a novel approach to separate intra- from extracellular NMR signal based on the detection of intermolecular zero-quantum coherences in presence of a chemical shift agent. In a sample of large cells in culture, the investigation of cellular uptake of pharmacological substances becomes feasible. The addition of 10 mM Tm-DOTP to a suspension of 100 Xenopus laevis oocytes resulted in sufficient separation of resonance frequencies between intra- and extracellular water. Upon selective excitation of either intra- or extracellular water signal, only intra- or extracellular components were observed, respectively. The presented localization technique provides intrinsic averaging over a large number of cells, resulting in a significant signal gain. The method works on standard NMR spectrometers, which are available at most scientific research institutions today. On a high-resolution NMR system with a cryoprobe, a 20-fold sensitivity gain was observed as compared to conventionally localized NMR spectroscopy of a single X. laevis oocyte on dedicated NMR microscopes." @default.
• W1973060067 created "2016-06-24" @default.
• W1973060067 creator A5000459369 @default.
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• W1973060067 date "2010-10-01" @default.
• W1973060067 modified "2023-09-30" @default.
• W1973060067 title "NMR Separation of Intra- and Extracellular Compounds Based on Intermolecular Coherences" @default.
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• W1973060067 doi "https://doi.org/10.1016/j.bpj.2010.06.068" @default.
• W1973060067 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3042554" @default.
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