Effects of natural and artificial defoliation on the content and composition of extractive substances in birch leaves

Autor:	E. E. Shul?ts, S. A. Bakhvalov, V. V. Martem?yanov, T. N. Petrova, I. N. Syromyatnikova, M. M. Shakirov, G. A. Tolstikov
Rok vydání:	2005
Předmět:	chemistry.chemical_classification fungi Flavonoid Fatty acid Flavanonol Biology Applied Microbiology and Biotechnology Biochemistry Flavones chemistry.chemical_compound chemistry Triterpene Betula pendula Saturated fatty acid Botany Composition (visual arts) Food science
Zdroj:	Scopus-Elsevier
ISSN:	1608-3024 0003-6838
Popis:	Qualitative and quantitative compositions of extracts of birch ( Betula pendula Roth.) leaves after natural and artificial defoliation were studied. Composition of the fraction of total lipids was determined. Over- all, 11 fatty acids were identified. Differences between the fatty acid compositions of total lipids in the trees subjected to defoliation, consisting in the increase in quantities of short-chain saturated fatty acids and trienoic acids, were detected. Nine individual compounds—six flavones, two flavanones, and one flavanonol—were iso- lated from the flavonoid fraction by column chromatography. It was found that the total content of extractive substances in birch leaves as well as amounts of free sterols, triterpene compounds, and flavones decreased 1 year after artificial defoliation and 1 month after depredation of 75% of birch stands by gypsy moths. On the contrary, the contents of flavanones and flavanonol increased. The assay method proposed may be used for studying the compositions of plant extracts.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::321fb5b8e364a4615a69404c36f92622 https://doi.org/10.1007/s10438-005-0017-5 Zobrazit plný text záznamu Plný text ve formátu PDF