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14N1H HMQC Solid-State NMR as a Powerful Tool to Study Amorphous Formulations – an Exemplary Study of Paclitaxel Loaded Polymer Micelles
preprintsubmitted on 09.05.2020, 17:53 and posted on 12.05.2020, 08:19 by Marvin Grüne, Robert Luxenhofer, Dinu Iuga, Steven P. Brown, Ann-Christin Pöppler
We present 14N-1H HMQC MAS NMR experiments in the solid state as a promising tool to study amorphous formulations. Poly(2-oxazoline) based polymer micelles loaded with different amounts of the cancer drug paclitaxel serve to highlight the possibilities offered by these experiments: While the very similar 15N chemical shifts hamper a solid-state NMR characterization based on this nucleus, 14N is a very versatile alternative. 14N-1H HMQC experiments yield well-separated signals, which are spread over a large ppm range, provide information on the symmetry of the nitrogen environment and probe 14N-1H through-space proximities.