Characterization of methanol extracts from Quercus hartwissiana wood and bark
| Autor: | Mualla Balaban Uçar, Güneş Uçar |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
chemistry.chemical_classification
Fructose Catechin Plant Science General Chemistry Xylose complex mixtures General Biochemistry Genetics and Molecular Biology chemistry.chemical_compound chemistry visual_art visual_art.visual_art_medium Tannin Organic chemistry Bark Condensed tannin Gallic acid Food science Ellagic acid |
| Zdroj: | Chemistry of Natural Compounds. 47:697-703 |
| ISSN: | 1573-8388 0009-3130 |
| DOI: | 10.1007/s10600-011-0039-6 |
| Popis: | The MeOH extracts of wood and bark from Quercus hartwissiana have been investigated by GC-MS after derivatization, as well as by classical spectroscopic methods. The results for the free compounds revealed that ellagic acid, catechin, gallic acid, quercitol, and also long chain fatty acids, sugars, and sitosterol were the essential compounds in wood and bark, most of them being present in differing amounts. Quercitol, a characteristic compound for the oak wood tannin, was also recognized and determined in oak bark extracts in this study. Amounting to 1/4th to 1/3rd of the free compounds, the bark had the highest catechin content. While the content of sugars, such as fructose and glucose, increased in sapwood and bark extracts remarkably, the amounts of these compounds decreased in extracts of heartwood. The profile of the bound compounds contained sugars (i.e., arabinose, xylose, and, above all, glucose), ellagic and gallic acids, quercitols, and inositols. Compared with the composition of free compounds, the hydrolyzed extracts showed relatively higher amounts of sugars, especially glucose, gallic acid and quercitol. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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