Flavonoid Biocides: Wood Preservatives Based on Condensed Tannins

Laks, Peter E.; McKaig, P.A.; Hemingway, Richard W.

doi:10.1515/hfsg.1988.42.5.299

Cited by 104 publications

(66 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the same way, many authors have underlined the direct relationship between durability and extractives [1,9,19,25,33,44,45]. They have shown that extractives play a key role in the biological resistance of many species [26,36,46,52].…”

Section: Relation Between Colour and Durabilitymentioning

confidence: 99%

Decay resistance inDicorynia guianensisAmsh.: analysis of inter-tree and intra-tree variability and relations with wood colour

et al. 2004

View full text Add to dashboard Cite

-Dicorynia guianensis Amsh. is very widespread in the forests of French Guiana and moreover is the leading species harvested in this area, but its main defect remains the great variability of wood durability, especially with respect to fungal decay. The aim of this work was to study this inter-and intra-tree variability in order to identify the parameters responsible for this variation (growth area, height and radial position) within the tree. The resistance decrease from the outer heartwood to the pith. Measurement of colour variation using the CIELAB (L*, a*, b*, C*, h*) system was performed at the intra-tree level to highlight the longitudinal and radial gradients of variation. Dicorynia guianensis becomes less red and dark from the outer to the inner heartwood and from the base to the top. Lastly, variations of colour and durability were correlated: the wood is less resistant the redder and darker it is.Dicorynia guianensis / Amazonian wood / wood colour/decay resistance / heartwood / variability Résumé -Variabilité de la durabilité inter-arbre et intra-arbre de Dicorynia guianensis -et relation avec la couleur. Dicorynia Guianensis Amsh. est une essence très répandue dans les forêts de Guyane française. C'est l'une des essences les plus exploitées cependant elle souffre d'un défaut majeur : une grande variabilité de sa durabilité naturelle à l'égard des champignons lignivores (Ascomycètes, Basidiomycètes). À travers l'étude de la variabilité inter-arbre et intra-arbre nous avons discuté de l'influence de paramètres tels : la localité, la taille de l'arbre, la hauteur et la position radiale sur la résistance naturelle. Dans une deuxième partie nous avons étudié l'influence de ces mêmes paramètres sur la mesure de la couleur (système CIELAB) du bois à l'échelle intra-arbre. Nous avons ainsi constaté que le paramètre « position radiale » était de loin le plus important à l'origine de la variabilité : Dicorynia guianensis est plus résistant du duramen interne vers le duramen externe ; moins rouge et moins sombre du duramen externe vers le duramen interne. Enfin, nous avons constaté que les variations de couleur et de durabilité chez Dicorynia guianensis étaient corrélées : le bois est d'autant plus résistant qu'il est moins rouge et plus clair sombre. bois amazonien / couleur du bois / résistance à la pourriture / duramen / variabilité

show abstract

Section: Relation Between Colour and Durabilitymentioning

confidence: 99%

Decay resistance inDicorynia guianensisAmsh.: analysis of inter-tree and intra-tree variability and relations with wood colour

et al. 2004

View full text Add to dashboard Cite

show abstract

“…Tannin-based wood preservatives have been prepared since the 1980s but their high water solubility represented a drawback that was not easy to eliminate (Laks et al 1988). In the following decades in-depth studies on tannin chemistry meant that new opportunities for the development of these compounds in wood science could be found (Pizzi 1994).…”

Section: Introductionmentioning

confidence: 99%

Tannin-boron preservatives for wood buildings: mechanical and fire properties

et al. 2012

View full text Add to dashboard Cite

The remarkable biological properties of tanninboron wood preservatives for outdoor applications have been investigated recently (Thevenon et al. in Eur. J. Wood Prod. 67:89, 2009). In the present paper mechanical and fire-proofing attributes of these formulations are determined. Mechanical properties of Scots pine and beech specimens treated with tannin-based formulations were examined in compression and bending strength tests and surface hardness was determined. The tannin-hexamine formulations reticulated into the wood structure improve the strength of the treated specimens. The treated samples which underwent compression, bending, hardness and gluing tests showed improvements of on average 20%.Fire tests have been monitored regarding short and long flame exposure time. Short tests such as ignition, flame and ember time have allowed the ignition of the fire to be simulated, while the weight loss tests have provided a good overview of the behavior of the specimens during prolonged fire. A positive effect on fire-resistance is shown when wood is treated with tannin formulations. The fire-proofing properties of the resin have been upgraded adding boron and phosphorus. The ember time of the pieces treated using this method can be reduced by up to ten times.

show abstract

“…In a field of research whose purpose is to protect wood with natural substances, tannins are considered to be the ideal solution (Laks et al 1988); based on this finding, other research groups have decided to follow a similar line of research (Yamaguchi and Okuda 1998, Taylor et al 2006, Tascioglu et al 2012, Tondi et al 2015. Therefore, the objective of this study was to evaluate the preservative effect of tannic extract on biodeterioration of wood of Acacia mearnsii.…”

Section: Introductionmentioning

confidence: 99%

Tannic extract potential as natural wood preservative of Acacia mearnsii

Silveira

Santini

Kulczynski

et al. 2017

An. Acad. Bras. Ciênc.

View full text Add to dashboard Cite

High toxicity of the preservatives most frequently used in wood treatment and the resulting risks of handling pose a threat to small producers and to the environment. In an attempt to mitigate these problems, the present study was conducted with the objective of evaluating the preservative effect of tannic extract on biodeterioration of Acacia mearnsii wood. For this purpose, untreated and preserved specimens, some with tannin extract and some with a preservative mixture based on CCB (Chromated Copper Borate), were submitted to accelerated rotting trials with the fungus that causes white rot (Pycnoporus sanguineus) for 16 weeks. The evaluations were made with a basis on weight loss and chemical components analysis, and they showed that the natural resistance of Acacia wood is moderate when exposed to the white rot fungus. The tannin concentrations showed similar effects to those of the CBB mixture in all evaluations, i.e., they significantly increased the biological resistance of the material, which started to be classified as very resistant to the fungus. Overall, the results suggest that tannin can be considered as a potential natural preservative product.

show abstract

Flavonoid Biocides: Wood Preservatives Based on Condensed Tannins

Cited by 104 publications

References 10 publications

Decay resistance inDicorynia guianensisAmsh.: analysis of inter-tree and intra-tree variability and relations with wood colour

Decay resistance inDicorynia guianensisAmsh.: analysis of inter-tree and intra-tree variability and relations with wood colour

Tannin-boron preservatives for wood buildings: mechanical and fire properties

Tannic extract potential as natural wood preservative of Acacia mearnsii

Contact Info

Product

Resources

About