Beech wood impregnation with hydrolyzed wattle tannin

Tannins and their toxic effects against various decay organisms have been interrelated for centuries. As natural products gained more interest, waste from several production fields abundant in tannins has yielded promising components wood preservation. In this work, the main approach was to split condensed into smaller fractions by chemical hydrolysis evaluate suitability beech impregnation. Commercial extract black wattle treated with mineral acid of low concentration. The volatile hydrochloric completely removed after reaction evaporation course freeze-drying. modified then applied as aqueous solution wood. water resistance not increased significantly, scanning electron microscopy (SEM) showed no evidence tannin successful bonding within cells. Nevertheless, strong leaching cycles, part accumulated fibers. Moreover, lyophilization found be a suitable technique eliminate acids temperature-sensitive extracts, such tannins. These findings could help development water-borne formulations protection, while using phlobaphene formation potential pathway autocondensation.