Potentials of Liquefied CCB Treated Waste Wood for Wood Preservation

Humar, Miha; Budija, Franc; Hrastnik, David; Lesar, Boštjan; Petrič, Marko

doi:10.5552/drind.2011.1110

Cited by 8 publications

(10 citation statements)

References 10 publications

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“…The phenolic compounds derived from lignin played an important role against fungal attack (Yen & Chang, 2008). Antifungal activity of liquefied wood and liquefied wood containing biocide were also tested against the selected wood degrading fungi in several studies (Hrastnik et al, 2013;Humar et al, 2011) 5 Determining major phenolic compounds in the bio-oil and their lignin-rich fraction that potentially have higher antioxidant activity is important. Identification of these chemicals will help to use them directly as antifungal agents for wood preservation.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the antioxidant activities of different bio-oils and their phenolic distilled fractions for wood preservation

Hassan

El-Giar

Steele

2016

International Biodeterioration & Biodegradation

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This research investigated the antioxidant activities of raw bio-oils produced from pine and oak wood species. The study also included the effect of the pyrolysis parameters on the properties of the bio-oils produced. In addition to raw bio-oils, phenolic fractions were further isolated from the bio-oils at two different temperature ranges (180-220C and 220-270C) by using spinning band distillation columns. The antioxidant activities of raw bio-oils and phenolic fractions were evaluated using the Trolox equivalent antioxidant capacity (TEAC) assay. The concentrations of phenolic compounds were determined by gas chromatography/mass spectrometry (GC/MS). The results of the assay showed that the antioxidant activities of the phenolic fractions are much higher than those of the parent bio-oils. GC/MS analysis results showed that oguaiacol and its derivatives (4-methylguaiacol, 4-ethylguaiacol, and 4-propylguiacol), phenol, 3-methylphenol, 2,3-dimethylphenols, 3-ethylphenol and eugenol are the most

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Section: Introductionmentioning

confidence: 99%

Evaluation of the antioxidant activities of different bio-oils and their phenolic distilled fractions for wood preservation

Hassan

El-Giar

Steele

2016

International Biodeterioration & Biodegradation

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“…This is not a surprising result as free radical formation during the photodegradation of lignin‐based material is already well described in the literature . More specifically, Humar et al . have shown, thanks to EPR, that hydroxy and hydroperoxide anions, species that can be formed from superoxide anion, are generated when lignins are exposed under light irradiation.…”

Section: Methodsmentioning

confidence: 99%

Acetylated Lignins: A Potential Bio‐Sourced Photosensitizer

Marchand¹,

Calliste²,

Williams

et al. 2018

ChemistrySelect

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Nowadays, lignins are receiving an increasing interest from the scientific community. Indeed, this biopolymer, formerly considered a waste‐product of the paper industry, appears today as an interesting oil equivalent in many fields. In this context, many chemical modifications of lignins have been presented to valorize this attractive feedstock. However, spectroscopic properties of these modified materials remain poorly studied, in particular their capacity to produce reactive oxygen species (ROS) under light irradiation. Thus, the purpose of this work is to monitor the production of singlet oxygen and superoxide anion under light irradiation of three different acetylated lignins. The results obtained show that those modified lignins can generate ROS levels, allowing to consider a use of these materials as photosensitizers for applications such as photodynamic treatments.

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“…Among few initial studies, Humar et al. reported a method for the in situ inspection and characterization of radicals during the photodegradation of wood by using a spin trap …”

Section: Spin‐trapping Esr Studies Of Unstable Radicals From Ligninmentioning

confidence: 99%

“…Humar et al. also reported the absence of free radicals in wood that was not exposed to UV light . This may be justified by the fact that wood stored in dark and dry places for a long time contained negligible amounts of intrinsic free radicals.…”

Section: Spin‐trapping Esr Studies Of Unstable Radicals From Ligninmentioning

confidence: 99%

“…This was further supported by additional experiments. A significant difference was witnessed in the respective concentrations of stable radical adducts in photodegraded BRW and cellulose from those in photodegraded wood . The major difference was observed between BRW and wood in the ratio of carbon‐centered radical adducts to hydroperoxide radical adducts.…”

Section: Spin‐trapping Esr Studies Of Unstable Radicals From Ligninmentioning

confidence: 99%

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Stable Organic Radicals in Lignin: A Review

Patil

Argyropoulos

2017

ChemSusChem

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Lignin and the quest for the origin of stable organic radicals in it have seen numerous developments. Although there have been various speculations over the years on the formation of these stable radicals, researchers have not been able to arrive at a solid, unequivocal hypothesis that applies to all treatments and types of lignin. The extreme complexity of lignin and its highly aromatic, cross-linked, branched, and rigid structure has made such efforts rather cumbersome. Since the early 1950s, researchers in this field have dedicated their efforts to the establishment of methods for the detection and determination of spin content, theoretical simulations, and reactions on model compounds and spin-trapping studies. Although a significant amount of published research is available on lignin or its model compounds and the reactive intermediates involved during various chemical treatments (pulping, bleaching, extractions, chemical modifications, etc.), the literature provides a limited view on the origin, nature, and stability of such radicals. Consequently, this review is focused on examining the origin of such species in lignin, factors affecting their presence, reactions involved in their formation, and methods for their detection.

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Potentials of Liquefied CCB Treated Waste Wood for Wood Preservation

Cited by 8 publications

References 10 publications

Evaluation of the antioxidant activities of different bio-oils and their phenolic distilled fractions for wood preservation

Evaluation of the antioxidant activities of different bio-oils and their phenolic distilled fractions for wood preservation

Acetylated Lignins: A Potential Bio‐Sourced Photosensitizer

Stable Organic Radicals in Lignin: A Review

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