Wood color changes and termiticidal properties of teak heartwood extract used as a wood preservative

Abstract

The aim of this study was to evaluate the change in colorimetric patterns and the termite resistance of light-colored and low durability wood when impregnated with teak (Tectona grandis) heartwood extractives. Hot water and ethanol extracts were obtained from 20-year-old teak heartwood and used to evaluate the influence on color change and the natural resistance of 10-year-old teak sapwood and Pinus sp. For wood impregnation, a full-cell (Bethell) treatment was conducted. To verify the influence of the teak extracts, the colorimetric patterns of wood were determined using the Munsell and CIE-L*a*b* systems. Choice and no-choice feeding tests were performed under laboratory conditions to test the efficacy of the teak extract solutions against two termite species Nasutitermes corniger and Cryptotermes brevis. All of the extract solutions promoted a significant darkening of the wood, bringing the color of the impregnated wood closer to older teak heartwood than the untreated samples of the respective species. Ethanol extracts increased the resistance and mortality against N. corniger in both choice and no-choice tests. Resistance to C. brevis was not clearly affected.

Sustainability in wood materials science: an opinion about current material development techniques and the end of lifetime perspectives

“…In another approach, the introduction of extractives into the wood leads to improvements in its properties (higher dimensional stability, protection against biodegradation) [38,39]. However, in these studies either a first wood modification with fossil-based products was used, or solvents were needed to allow for in-depth wood penetration.…”

Deterioro y preservación de maderas mediante el uso de preservadores naturales de potencial interés en Brasil

“…contra el ataque de hongos de pudrición blanca y marrón mediante ensayos de deterioro acelerado (Brocco et al 2017). También se han realizado estudios acerca del deterioro acelerado de teca impregnada con extractos de teca contra el ataque de las termitas, permitiendo una mejoría en el color de la madera (Brocco et al 2020). La fijación de los extractos de teca promovió un aumento en la resistencia de las maderas de teca a hongos de pudrición blanca o marrón en valores de pérdidas de masa.…”

Natural dye extracted from Dalbergia cochinchinensis residue with water fastness, mildew resistance and permeability properties for wood staining

“…Interestingly, several ND can impart the dyed textile with multifunctional property pertain to appealing anti-UV and antibacterial performance, which was probably owing to ample natural phenols and/or avonoid compounds existed in the extracts (Bhuiyan et al, 2017;Rather et al, 2020;Silva et al, 2018). Additionally, literatures have reported that extracts from heartwood can be used as natural photo-stabilizers and wood preservative against termite (Brocco et al, 2019;Chang et al, 2015).…”