Solid-State 15N NMR Studies of Tobacco Leaves
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- 作者：Zhiru Ma ; Dewey H. Barich ; Mark S. Solum ; and Ronald J. Pugmire
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2004
- 出版时间：January 28, 2004
- 年：2004
- 卷：52
- 期：2
- 页码：215 - 221
- 全文大小：107K
- 年卷期：v.52,no.2(January 28, 2004)
- ISSN：1520-5118
文摘
Nitrogen-containing compounds are one important class of constituents in tobacco because of variouspharmacological and biological properties. Three types of tobacco leaves (burley, bright, and oriental)were studied using solid-state 15N NMR cross polarization with magic-angle spinning, dipolar dephasingand five 
replicated magic angle turning (FIREMAT) experiments. The results show that burleytobacco leaves contain significantly more pyridinic nitrogen than that of bright or oriental tobaccoleaves. The principal values of 15N chemical shift tensors of nitrogen functional groups were obtainedfrom the FIREMAT data. Possible assignments of solid-state 15N NMR resonances were made usingnitrogen chemical shift tensors in some model compounds or isotropic chemical shift values fromliquid NMR results. To the best of our knowledge, this is the first solid-state 15N NMR study of tobaccoplant material.Keywords: Solid-state 15N NMR; tobacco leaves; nitrogen compounds; FIREMAT
replicated magic angle turning (FIREMAT) experiments. The results show that burleytobacco leaves contain significantly more pyridinic nitrogen than that of bright or oriental tobaccoleaves. The principal values of 15N chemical shift tensors of nitrogen functional groups were obtainedfrom the FIREMAT data. Possible assignments of solid-state 15N NMR resonances were made usingnitrogen chemical shift tensors in some model compounds or isotropic chemical shift values fromliquid NMR results. To the best of our knowledge, this is the first solid-state 15N NMR study of tobaccoplant material.Keywords: Solid-state 15N NMR; tobacco leaves; nitrogen compounds; FIREMAT