Review on Lipophilic and Hydrophilic Extractives in Tissues of Common Beech

Viljem Vek,Ida Poljanšek,Primož Oven

doi:10.5552/drind.2016.1511

Viljem Vek, Ida Poljanšek + Show 1 more

Open Access

https://doi.org/10.5552/drind.2016.1511

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Journal: Drvna Industrija	Publication Date: Jan 1, 2016
Citations: 8	License type: cc-by

Affiliation: University of Ljubljana

Abstract

Common beech (Fagus sylvatica L.) is one of the most widespread and economically important tree species in Europe and, therefore, represents a potential source of high value added extractives. The aim of this paper was, therefore, to review the existing data regarding the composition of lipophilic and hydrophilic extractives of beech tissues, and the extraction systems and analytical techniques used for their examination. The lipophilic extractable fraction of beech is characterized mainly by saturated and unsaturated fatty acids, fatty alcohols and sterols while the hydrophilic extractives of beech consist of soluble sugars, i.e. monosaccharides, oligosaccharides, sugar alcohols and sugar acids, as well as of simple phenols and fl avonoids. Chromatography has been recognized as the convenient and most frequently used technique for the chemical analysis of extractives. This overview showed that the information about the composition of low-molecular extractives of beech is satisfactory, but the data on oligomeric extractives are still fragmentary.

Highlights

It can be summarized that successive extraction using the non-polar and polar solvent, respectively, represents the most frequently used and appropriate way of extraction of different beech material
The extractives can be obtained from grinded samples by using magnetic stirrer, whereas, more aggressive extraction techniques are recommended, e.g. conventional Soxhlet apparatus or various subcritical systems for accelerated extraction (Thurbide and Hughes, 2000; Vek, 2013)
From the analytical aspect of view, chromatography in combination with mass spectrometry has been found as the convenient technique for the qualitative and quantitative analysis of extractives

Summary

INTRODUCTION

For the determination of groups of extractives in wood extracts, e.g. total phenols, flavonoids or proanthocyanidins, a spectrophotometric analysis (UV-Vis) represents a quick and reliable technique (Baum and Schwarze, 2002; Albert et al, 2003; Brighente et al, 2007; Vek et al, 2013a; Vek et al, 2013b). A few research groups reported on the presence of catechin in the sapwood and discoloured wood (Kubel and Weissmann, 1988; Baum and Schwarze, 2002; Koch et al, 2003; Zule and Može, 2003; Hofmann et al, 2004; 2008). Replacement of synthetic, artificial chemicals with more benign natural products, whose recovery has only little or no impact on human health and environment, is one of the important challenges in the field of biorefining forest biomass (Holmbom, 2011)

ZAKLJUČAK

Findings

LITERATURA