$fracture toughness; mode I critical stress intensity factor; fracture mechanics; beech wood$
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fracture toughness; mode I critical stress intensity factor; fracture mechanics; beech wood

The aim of this research was to examine the content of catechin in normal and traumatic structures of beechwood by high performance liquid chromatography (HPLC). Two discs were sawn from each of six harvested trees. The first disc was taken from the lower, wounded part and the second one from the up...

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Autor principal:	Viljem Vek Primož Oven Ida Poljanšek
Formato:	article
Lenguaje:	EN
Publicado:	University of Zagreb, Faculty of Forestry and Wood Technology 2013
Materias:	catechin liquid chromatography wound-wood knots Fagus sylvatica Forestry SD1-669.5
Acceso en línea:	https://doaj.org/article/694e799d5b174c7fa114c023134632ca
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id	oai:doaj.org-article:694e799d5b174c7fa114c023134632ca
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spelling	oai:doaj.org-article:694e799d5b174c7fa114c023134632ca2021-12-02T00:33:06Zfracture toughness; mode I critical stress intensity factor; fracture mechanics; beech wood10.5552/drind.2013.13070012-67721847-1153https://doaj.org/article/694e799d5b174c7fa114c023134632ca2013-09-01T00:00:00Zhttp://hrcak.srce.hr/file/159343https://doaj.org/toc/0012-6772https://doaj.org/toc/1847-1153The aim of this research was to examine the content of catechin in normal and traumatic structures of beechwood by high performance liquid chromatography (HPLC). Two discs were sawn from each of six harvested trees. The first disc was taken from the lower, wounded part and the second one from the upper part of each stem. Discs containing the bases of living and dead branches were taken from the crown. Samples of wound-wood, reaction zones, sapwood, as well as living and dead knots, were sampled from discs. Samples were milled and then extracted sequentially by cyclohexane and methanol/water in a Soxhlet apparatus. A method for the separation of catechins from extracts was developed for the present chromatographic investigation. Statistical analysis did not reveal significant differences in total or hydrophilic extractives, nor in the content of catechin among the investigated trees. The content of hydrophilic extractives and catechin were significantly different among the investigated categories of wood tissues. Wound-wood and knot extracts contained the highest amount of this flava-3-ol. Reaction zones contained higher amounts of catechin than discolored wood, but less than sapwood. The extracts of discolored wood showed the lowest amounts of catechin. Sapwood samples that originated from wounded discs exhibited significantly higher contents of catechin than normal sapwood from upper discs. Accumulation of bioactive compound catechin in wound-wood, sapwood and knots is considered to be an important part of the survival strategy of living trees.Viljem Vek Primož Oven Ida PoljanšekViljem Vek Primož Oven Ida PoljanšekViljem Vek Primož Oven Ida PoljanšekUniversity of Zagreb, Faculty of Forestry and Wood Technologyarticlecatechinliquid chromatographywound-woodknotsFagus sylvaticaForestrySD1-669.5ENDrvna Industrija, Vol 64, Iss 3, Pp 231-238 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	catechin liquid chromatography wound-wood knots Fagus sylvatica Forestry SD1-669.5
spellingShingle	catechin liquid chromatography wound-wood knots Fagus sylvatica Forestry SD1-669.5 Viljem Vek Primož Oven Ida Poljanšek Viljem Vek Primož Oven Ida Poljanšek Viljem Vek Primož Oven Ida Poljanšek fracture toughness; mode I critical stress intensity factor; fracture mechanics; beech wood
description	The aim of this research was to examine the content of catechin in normal and traumatic structures of beechwood by high performance liquid chromatography (HPLC). Two discs were sawn from each of six harvested trees. The first disc was taken from the lower, wounded part and the second one from the upper part of each stem. Discs containing the bases of living and dead branches were taken from the crown. Samples of wound-wood, reaction zones, sapwood, as well as living and dead knots, were sampled from discs. Samples were milled and then extracted sequentially by cyclohexane and methanol/water in a Soxhlet apparatus. A method for the separation of catechins from extracts was developed for the present chromatographic investigation. Statistical analysis did not reveal significant differences in total or hydrophilic extractives, nor in the content of catechin among the investigated trees. The content of hydrophilic extractives and catechin were significantly different among the investigated categories of wood tissues. Wound-wood and knot extracts contained the highest amount of this flava-3-ol. Reaction zones contained higher amounts of catechin than discolored wood, but less than sapwood. The extracts of discolored wood showed the lowest amounts of catechin. Sapwood samples that originated from wounded discs exhibited significantly higher contents of catechin than normal sapwood from upper discs. Accumulation of bioactive compound catechin in wound-wood, sapwood and knots is considered to be an important part of the survival strategy of living trees.
format	article
author	Viljem Vek Primož Oven Ida Poljanšek Viljem Vek Primož Oven Ida Poljanšek Viljem Vek Primož Oven Ida Poljanšek
author_facet	Viljem Vek Primož Oven Ida Poljanšek Viljem Vek Primož Oven Ida Poljanšek Viljem Vek Primož Oven Ida Poljanšek
author_sort	Viljem Vek Primož Oven Ida Poljanšek
title	fracture toughness; mode I critical stress intensity factor; fracture mechanics; beech wood
title_short	fracture toughness; mode I critical stress intensity factor; fracture mechanics; beech wood
title_full	fracture toughness; mode I critical stress intensity factor; fracture mechanics; beech wood
title_fullStr	fracture toughness; mode I critical stress intensity factor; fracture mechanics; beech wood
title_full_unstemmed	fracture toughness; mode I critical stress intensity factor; fracture mechanics; beech wood
title_sort	fracture toughness; mode i critical stress intensity factor; fracture mechanics; beech wood
publisher	University of Zagreb, Faculty of Forestry and Wood Technology
publishDate	2013
url	https://doaj.org/article/694e799d5b174c7fa114c023134632ca
work_keys_str_mv	AT viljemvekprimozovenidapoljansek fracturetoughnessmodeicriticalstressintensityfactorfracturemechanicsbeechwood AT viljemvekprimozovenidapoljansek fracturetoughnessmodeicriticalstressintensityfactorfracturemechanicsbeechwood AT viljemvekprimozovenidapoljansek fracturetoughnessmodeicriticalstressintensityfactorfracturemechanicsbeechwood
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fracture toughness; mode I critical stress intensity factor; fracture mechanics; beech wood

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