Durability of Pinus elliottii Wood Impregnated with Quebracho Colorado (Schinopsis balansae) Bio-Protectives Extracts and CCA

Abstract

Some wood preservatives have a warning due to environmental restrictions and risks to man health. The aim of this study is to determine the performance of non impregnated and impregnated wood with a CCA salt and a bio-protective made from "quebracho colorado", when facing the action of fungi responsible for white rot decay by Pycnoporus sanguineus and brown rot attack by Gloeophyllum sepiarium. Wood samples were impregnated with different solutions by vacuum-pressure method. The design was in complete blocks at random with fi ve repetitions. The treatments were T 0 : non impregnated blank sample; impregnated T 1 : CCA; T 2 Colatan IPG-F, T 3 : Colatan IPG-C, T 4 : Colatan IPG-C, with retentions of: 6, 18, 9 and 25 kg m -3 respectively. The variable was wood weight loss. Preservative CCA and bio-protective Colatan IPG-C increased the resistance to fungal degradation in lab assay, changing from non-resistance to very resistant (Findlay criterion), guaranteeing the biodegradation process inhibition.

Natural Compounds for Wood Protection against Fungi—A Review

“…Improved antifungal efficacy of condensed tannin-containing bark extracts from loblolly pine ( Pinus taeda ) complexed with copper(II) ions applied on birch samples against C. versicolor in comparison with bark extracts themselves was confirmed by Laks [ 78 , 87 ]. A similar effect was obtained by Ramirez et al [ 88 ] for Cocos nucifera tannin–copper complex solutions applied on alder samples, and for Bernardis and Popoff [ 89 ] who reported high resistance of Pinus elliottii wood samples treated with “quebracho colorado” tannin extract complexed with CCA salt solution against white-rot P. sanguineus and brown-rot fungus Gloeophyllum sepiarium .…”

Eficiência de preservantes fungicidas em madeiras de duas espécies florestais submetidas à deterioração por fungo

“…Submetendo madeiras de Pinus elliottii à deterioração pelo fungo de podridão branca Pycnoporus sanguineus, Bernardis;Popoff (2009) obtiveram uma perda de massa de 25%.…”

Estimación de la toxicidad de biopreservantes tánicos sobre hongos xilófagos

“…P. Karst. cepa 735 (LPSC) -Cepario del Instituto Spegazzini, La Plata, causantes de pudrición blanca (Pb) y castaña (Pc), respectivamente, consideradas especies de referencia para este tipo de ensayos (IRAM 9518, 1962;Mora y Encinas, 2001;Bobadilla et al, 2005;Alves da Silva et al, 2007;Bernardis y Popoff, 2009, Thévenon et al, 2010.…”

“…Para esta condición de la madera, el porcentaje medio de Pp significativamente superior determinado en el material expuesto a la cepa de pudrición castaña coincide con estudios previos , en los que se pone en evidencia la alta susceptibilidad de las Gimnospermas a este tipo de pudrición (Winandy y Morrell, 1993;Morrell y Freitag, 1995;Juacida y Villanueva, 1996;Mora y Encinas, 2001;Curling et al, 2002;Miller et al, 2003;Pandey y Pitman, 2003;Schwarze et al, 2003, Bernardis y Popoff, 2009. Schwarze ( 2007) menciona la alta adaptación de estos hongos al leño relativamente simple de las Gimnospermas.…”

“…En términos generales, la preservación involucra el uso de compuestos químicos potencialmente perjudiciales para el ser humano y para el medio ambiente. A causa de ello, el uso de extractivos naturales (biopreservantes) es considerado y estudiado como una alternativa viable (Rodríguez Barreal, 1998;Onuorah, 2000;Kumar y Gupta, 2006;Velásquez et al, 2006;Bernardis y Popoff, 2009). Da Silva Oliveira et al (2000) y Thévenon et al (2010) mencionan el tratamiento de las maderas no durables con extractivos provenientes de especies con alta durabilidad natural como también la utilización de dichos compuestos como modelos de síntesis de nuevos preservantes.…”