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- W2103155019 abstract "Analysis of C cross-polarization magic angle spinning (CP/MAS) nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), Fourier transform infrared (FTIR), and X-ray powder diffraction data of trospium chloride (TCl) products crystallized from different mixtures of water-ethanol [φ(EtOH)=0.5—1.0] at various temperatures (0°C, 20°C) and initial concentrations (saturated solution, 30%—50% excess of solvent) revealed extensive structural variability of TCl. Although 13C CP/MAS NMR spectra indicated broad variety of structural phases arising from molecular disorder, temperature-modulated DSC identified presence of two distinct components in the products. FTIR spectra revealed alterations in the hydrogen bonding network (ionic hydrogen bond formation), whereas the X-ray diffraction reflected unchanged unit cell parameters. These results were explained by a two-component character of TCl products in which a dominant polymorphic form is accompanied by partly separated nanocrystalline domains of a secondary phase that does not provide clear Bragg reflections. These phases slightly differ in the degree of molecular disorder, in the quality of crystal lattice and hydrogen bonding network. It is also demonstrated that, for the quality control of such complex products, 13C CP/MAS NMR spectroscopy combined with factor analysis (FA) can satisfactorily be used for categorizing the individual samples: FA of 13C CP/MAS NMR spectra found clear relationships between the extent of molecular disorder and crystallization conditions." @default.
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- W2103155019 date "2013-04-01" @default.
- W2103155019 modified "2023-10-11" @default.
- W2103155019 title "Characterizing Crystal Disorder of Trospium Chloride: A Comprehensive,13C CP/MAS NMR, DSC, FTIR, and XRPD Study" @default.
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- W2103155019 doi "https://doi.org/10.1002/jps.23457" @default.
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