Natural-abundance (13)C nuclear magnetic resonance spectra are reported for some simple terpenes and carotenes. The techniques involved in the assignment of the resonances to specific carbons are outlined. The potential of this nondegradative procedure for structural analysis is demonstrated for the investigation of carbon atoms in chemical and biochemical systems.
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http://dx.doi.org/10.1073/pnas.65.2.288 | DOI Listing |
Sci Rep
January 2025
School of Biosciences, University of Nottingham, Sutton Bonington, LE12 5RD, UK.
Tropical peatlands are carbon-dense ecosystems that are significant sources of atmospheric methane (CH). Recent work has demonstrated the importance of trees as an emission pathway for CH from the peat to the atmosphere. However, there remain questions over the processes of CH production in these systems and how they relate to substrate supply.
View Article and Find Full Text PDFChemphyschem
January 2025
Departamento de Química Física y Química Inorgánica, Facultad de Ciencias - I.U. CINQUIMA, Universidad de Valladolid, Paseo de Belén 7, E-47011, Valladolid, Spain.
Indane-based molecules are effective scaffolds for different pharmaceutical products, so it is relevant to analyze the relation between structure and functionality in indane derivatives. Here, we have characterized the conformational landscape and molecular structure of 1-aminoindane in the gas phase using chirped-excitation Fourier-transform microwave spectroscopy and computational methods. The rotational spectrum confirmed the presence of two conformers, which were identified based on their rotational constants and N nuclear quadrupole coupling tensor elements.
View Article and Find Full Text PDFJ Am Chem Soc
January 2025
Nantes Université, CNRS, CEISAM, UMR 6230, F-44000 Nantes, France.
NMR is a central tool in the field of metabolomics, thanks to its ability to provide valuable structural and quantitative information with high precision. Most NMR-based metabolomics studies rely on 1D H detection, which is heavily limited by strong peak overlap. C NMR benefits from a wider spectral dispersion and narrower signal line width but is barely used in metabolomics due to its low sensitivity.
View Article and Find Full Text PDFBr J Nutr
December 2024
Department of Odontostomatologic and Specialized Clinical Sciences, Polytechnic University of Marche, Ancona, Italy.
Anal Chem
December 2024
Institute of Bioinformatics, University of Georgia, 120 E Green St, Athens, Georgia 30602, United States.
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