Solid-State 15N NMR Studies of Tobacco Leaves
| Autor: | Ronald J. Pugmire, Dewey H. Barich, Mark S. Solum, Zhiru Ma |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Nicotine
Magnetic Resonance Spectroscopy Tobacco chemistry Magic angle Nitrogen Pyridines Chemistry Stereochemistry Cross polarization Solid-state chemistry.chemical_element General Chemistry Plant Leaves Crystallography Species Specificity Biological property Tobacco General Agricultural and Biological Sciences Chemical composition Analysis method |
| Zdroj: | Journal of Agricultural and Food Chemistry. 52:215-221 |
| ISSN: | 1520-5118 0021-8561 |
| DOI: | 10.1021/jf034807x |
| Popis: | Nitrogen-containing compounds are one important class of constituents in tobacco because of various pharmacological and biological properties. Three types of tobacco leaves (burley, bright, and oriental) were studied using solid-state (15)N NMR cross polarization with magic-angle spinning, dipolar dephasing and five pi replicated magic angle turning (FIREMAT) experiments. The results show that burley tobacco leaves contain significantly more pyridinic nitrogen than that of bright or oriental tobacco leaves. The principal values of (15)N chemical shift tensors of nitrogen functional groups were obtained from the FIREMAT data. Possible assignments of solid-state (15)N NMR resonances were made using nitrogen chemical shift tensors in some model compounds or isotropic chemical shift values from liquid NMR results. To the best of our knowledge, this is the first solid-state (15)N NMR study of tobacco plant material. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|