1. Structure and Metabolic‐Flow Analysis of Molecular Complexity in a 13 C‐Labeled Tree by 2D and 3D NMR
- Author
-
Takanori Komatsu, Risa Ohishi, Jun Kikuchi, and Amiu Shino
- Subjects
0301 basic medicine ,Analytical chemistry ,chemistry.chemical_element ,General Chemistry ,Nuclear magnetic resonance spectroscopy ,General Medicine ,Resonance (chemistry) ,010402 general chemistry ,Small molecule ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Isotopic labeling ,NMR spectra database ,03 medical and health sciences ,030104 developmental biology ,chemistry ,Atom ,Density functional theory ,Carbon - Abstract
Improved signal identification for biological small molecules (BSMs) in a mixture was demonstrated by using multidimensional NMR on samples from (13) C-enriched Rhododendron japonicum (59.5 atom%) cultivated in air containing (13) C-labeled carbon dioxide for 14 weeks. The resonance assignment of 386 carbon atoms and 380 hydrogen atoms in the mixture was achieved. 42 BSMs, including eight that were unlisted in the spectral databases, were identified. Comparisons between the experimental values and the (13) C chemical shift values calculated by density functional theory supported the identifications of unlisted BSMs. Tracing the (13) C/(12) C ratio by multidimensional NMR spectra revealed faster and slower turnover ratios of BSMs involved in central metabolism and those categorized as secondary metabolites, respectively. The identification of BSMs and subsequent flow analysis provided insight into the metabolic systems of the plant.
- Published
- 2016