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Publikācija: Characterization of Bark Extract from Deciduous Trees with Emphasis on Their Antioxidant Activity

Publication Type Conference paper
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Characterization of Bark Extract from Deciduous Trees with Emphasis on Their Antioxidant Activity
Field of research 2. Engineering and technology
Sub-field of research 2.5 Materials engineering
Authors Sarmīte Janceva
T. Dizhbite
L. Vevere
G. Telysheva
Mārcis Dzenis
Keywords -
Abstract The bark of deciduous tree species growing in the Europe, in particular, in Latvia, is scarcely explored as a source for obtaining of valuable extractives products. The composition of their bark extractives was not yet studied systematically. High portion of flavonoids polymers - proanthocyanidins, better known as condensed tannins (CT) in polyphenolic pool of bark makes it a prospective raw material not only for medicine and veterinary but also for industrial application. Such condensed tannins as „quebracho” are produced commercially from wood and bark of acacia (Schinopsis sp.) trees and are often used as a raw material for the industrial production. At present, demand for natural antioxidants is increasing, primarily due to the uncertain safety of synthetic compounds, for example, BHA, BHT, Irganox etc. The aim of the present work was screening of some widely spread in Latvia and Europe deciduous tree species: grey alder (Alnus incana), black alder (Alnus glutinosa), ash tree (Fraxinus excelsior), and goat willow (Salix caprea) as a potential source for obtaining of hydrophilic extract enriched with proanthocyanidins and their testing as a polymeric antioxidant for polymer compositions (poly-urethane, PU, elastomers). The barks of deciduous trees were sequentially extracted (Accelerated Solvent Extractor ASE 350, Dionex) using solvents of increasing polarity. The data about total content of both lipophilic and hydrophilic compounds were obtained using sequentially extraction with hexane and aqueous ethanol.
Hyperlink: http://alephfiles.rtu.lv/TUA01/000051040_e.pdf#page=158 
Reference Janceva, S., Dizhbite, T., Vevere, L., Telysheva, G., Dzenis, M. Characterization of Bark Extract from Deciduous Trees with Emphasis on Their Antioxidant Activity. In: Baltic Polymer Symposium 2015: Programme and Proceedings, Latvia, Sigulda, 16-18 September, 2015. Riga: RTU Press, 2015, pp.158-158.
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