Tannic extract potential as natural wood preservative of Acacia mearnsii

Abstract

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.

Evaluation of the Inhibitory Potential of Casuarictin, an Ellagitannin Isolated from White Mangrove (Laguncularia racemosa) Leaves, on Snake Venom Secretory Phospholipase A2

“…Tannins have great potential for the protection of plants against insects, diseases, and herbivores. Additionally, several studies have revealed the potential of these compounds in the development of pharmaceuticals and the conservation of wood [20,21]. Likewise, these compounds are able to induce protein, carbohydrate, and metal ion precipitation, revealing their use as tools for the precipitation of proteins and other organic molecules [22].…”

Natural Compounds for Wood Protection against Fungi—A Review

“…Increased activity of mimosa tannin against T. palustris and C. versicolor was reported by Yamaguchi and Okuda [ 83 ] after its chemical modification and removal of low molecular weight compounds by dialysis. Tannin extracts from Acacia mearnsii were reported by Da Silveira et al [ 84 ] as an effective wood preservative against white-rot fungus P. sanguineus. In turn, Mansour and Salem [ 85 ] showed a complete suppression of T. harzianum (mould) growth by Maclura pomifera , Callistemon viminalis and Dalbergia sissoo bark extracts.…”

Improving Fire Retardancy of Beech Wood by Graphene

“…Wood-based materials and composites are no exception [22][23][24]. Different nano-metals and nano-minerals were utilized to improve heat-transfer property in solid wood species and wood composite mats; they were also used to improve biological resistance against different deteriorating fungi to decrease hot-press time as a costly bottle-neck in nearly all wood-composite manufacturing factories and to increase thermal conductivity in solid wood and composite mats [3,15,18,[25][26][27][28][29][30][31][32][33].…”