Knotwood and bark extracts: strong antioxidants from waste materials

Fungitoxic Potential of Extracts of Four Pinus spp. Bark to Inhibit Fungus Trametes versicolor (L. ex. Fr.) Pilát

“…The amount of obtained bark extract usually varies from one species to another; it also depends on the type of solvent used for extraction. Pietarinen et al (2006) reported that 19% of bark extract was obtainable through a sequential bark extraction from P. strobus, firstly using pure hexane and then applying a ketone-water mixture 95:5% V/V. Over these types of bark extracts, for this work a mixture of the same three solvents was used, and the yield of bark extract obtained was 12.34%; the latter confirms that the solvent system used has a strong influence on the amount of extract obtainable.…”

“…Over these types of bark extracts, for this work a mixture of the same three solvents was used, and the yield of bark extract obtained was 12.34%; the latter confirms that the solvent system used has a strong influence on the amount of extract obtainable. Pietarinen et al (2006) also reported the following bark extract components: lignans (5%), lariciresinol (4%), flavonoids (8%), pinobanksin (4%), pinocembrin (2%), and pinosylvins (45%). In the case of bark extracts from P. caribaea, Alessandrini and Vargas (2006) reported a total yield of 13.05% of bark extractions that were obtained through a sequence of eight different solvents.…”

“…Espelie 1989) and pinosylvins (Pietarinen et al 2006), which are the main compounds extracted using hexane and acetone, respectively.…”

Influence of Heartwood on Wood Density and Pulp Properties Explained by Machine Learning Techniques

“…The samples were subsequently chipped to particles with approximately 50 mm length, 10 mm width and 5 mm thickness, taking care to avoid any knotwood-since their extractive content may influence pulping [25]-and submitted to conventional Kraft pulping in a forced circulation digester under the following reaction conditions: active alkali charge 21.3% (as NaOH); sulfidity index 30%; liquor/wood ratio 4/1; time to temperature 90 min; time at temperature (160 • C) 90 min. Experiments were carried out with 25 g (oven dry) of wood, as reported in Santos et al [6].…”

Content of Total Phenols in Red Heart and Wound-Associated Wood in Beech (Fagus sylvatica L.)

“…Our recent research showed that extracts of wound-associated wood of beech inhibited the growth of some wood decaying fungi (Vek et al, 2013) and, therefore, might be utilized as wood preservatives. It was also proven that some wood extractives have antioxidative properties (Pietarinen et al, 2006) and can potentially be used as technical antioxidants. Our further research is directed towards identifi cation and quantifi cation of compounds in extracts of wound-associated wood of beech.…”