Objective The proposed work has two purposes: to determine and characterize the main European sources of tannins (woods and barks); to explore their possible use as preservatives for wood or materials derived from wood. The research proposed has three purpos es: 1-to understand the mechanisms by which tannins protect lignocellulose f rom biodegradation; 2-to determine and characterise the main European source s or materialsplore their possible use was preservatives for wood These thre e objectives are motivated by the foll owing observations: 1-Heartwoods rich in tannins (e.g. oak or chestnut) are naturally durable. The mechanisms by w hich tannins protect lignocellulose ar e unknown even if several hypotheses h ave been proposed. A better understand ing of these mechanisms will allow to make a rational choice among the diffe rent sources of tannins and to modify these tannins in order to obtain an op timum fungicide activity. rich in tannins (10 to 30% of dry matt er). Oak and chestnut woods are curren tly extracted for their tannins, mainl y for leather production. Tannins from oak bark were used on a large scale u p to the beginning of this century. A renewed interest for natural organic c hemicals (and tannins) has emerged aft er oil shortages in the 1970's. Resour ces should thus be reexamined in the l ight of new potential uses of tannins. 3-One of these potential uses is relat ed to (ligno)cellulose preservation. T raditionnally, tannins heve been utili sed as preservatives for fish-nets, ro pes and fabrics. Very good protection of wood has been recently obtained in North-America, by impregnation with ta nnins and Cu (II) salts. Due to their physico-chemical properties (and parti cularly their astringency), tannins ca n be used not only for their fungicide properties but also to fix within the wood or materials derived from it, ot her fungicides or insecticides otherwi se easily leached. Wood adhesives base d on tannins have been used in a few c ountries, but have not been studied so far in relation to durability improve ment of the product. Different tannin extracts, alone or in combination with other fungicides or insecticides, wil l thus be tested for impregnation of w ood and manufacture of particleboard a nd plywood. The properties of the products, includ ing the resistance against rots, bluestains and termites for woods and agai nst rots for wood panels, will be eval uated. Such a research associating tannins an d wood preservation has not yet been d eveloped in Europe. The gathering of 8 laboratories covering fields such as tannin chemistry, polyphenol microbiol ogy, wood preservation and wood panels making, should lead to the developmen t of new durable and environmentally s afe products based on wood. Fields of science agricultural sciencesagriculture, forestry, and fisheriesforestry Programme(s) FP2-FOREST - Specific research and technological development programme (EEC) in the fields of raw materials and recycling - Renewable raw materials: Forestry and wood products (including cork) -, 1990-1992 Topic(s) Data not available Call for proposal Data not available Funding Scheme CSC - Cost-sharing contracts Coordinator Institut National de la Recherche Agronomique (INRA) EU contribution No data Address Route de Thiverval 78850 Thiverval-Grignon France See on map Total cost No data Participants (5) Sort alphabetically Sort by EU Contribution Expand all Collapse all Centre Technique de l'Industrie du Bois Belgium EU contribution No data Address 830,Chaussée d'Alsemberg 1180 Bruxelles See on map Total cost No data Centre Technique du Bois et de l'Ameublement (CTBA) France EU contribution No data Address 10 avenue de Saint-Mandé 75012 Paris See on map Total cost No data ECOLE NORMALE SUPERIEURE France EU contribution No data Address Rue Lhomond 24 75231 PARIS See on map Total cost No data Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria Spain EU contribution No data Address KM.7,Carretera de la Coruña-Apdo. 8.111 28040 Madrid See on map Total cost No data Isoroy SA France EU contribution No data Address 108 route d'Orbec 14102 Lisieux See on map Total cost No data
