Free and Conjugated Phytosterols in Cured Tobacco Leaves: Influence of Genotype, Growing Region, and Stalk Position
| Autor: | Jia-He Jiang, Shao-Kun Wang, Li Fang, Hai-Jun Bai, Wen-Hui Liu, Shao-Min Liu, Guo-Ping Yong |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
chemistry.chemical_classification
China Genotype biology Growing region Chemistry Phytosterol Nicotiana tabacum Phytosterols Glycoside Esters General Chemistry Environment biology.organism_classification Plant Leaves Stalk Tobacco Botany Curing of tobacco Composition (visual arts) Glycosides Food science General Agricultural and Biological Sciences |
| Zdroj: | Journal of Agricultural and Food Chemistry. 56:185-189 |
| ISSN: | 1520-5118 0021-8561 |
| DOI: | 10.1021/jf0722708 |
| Popis: | Although phytosterols in tobacco leaves have specific effects on tobacco quality, there is little research on the distribution of free and conjugated phytosterols in various tobacco leaves. In this paper, we explored the content and composition of phytosterols in representative cured tobacco leaves by gas chromatography of TMS-ether derivatives. We found that phytosterol contents in tobacco leaves ranged from 1.0 to 2.5 mg/g of dried leaf tissue, depending on different types of tobacco leaves. The majority of phytosterols (75-85%) were conjugated as ester and glycosides, with only about 15-25% existing in the free form. Furthermore, the genetic variability gives rise to the significant differences among different tobacco types with phytosterol levels: the contents of phytosterols in tobacco leaves decreased in the order of flue-cured tobacco, Oriental tobacco, Burley tobacco, cigar tobacco, and Maryland tobacco. At the same time, the tobacco curing process leads to a difference in phytosterol existing-form distribution in some variation laws. |
| Databáze: | OpenAIRE |
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