Objective UPGRADING OF BARK BY CRACKING THIS RAW MATERIAL INTO SEVERAL FRACTIONS AND FINDING A GOOD APPLICATION FOR EACH PRODUCT. THIS PROGRAMME IS DIVIDED IN THREE PARTS : 1. ANALYSIS OF BARK : THIS PART IS VERY IMPORTANT AND THIS WORK HAS NOT BEEN COMPLETELY CARRIED OUT. 2. DEVELOPMENT OF THE CRACKING PROCESS, ESPECIALLY AN ALKALINE EXTRACTION. THE POLYPHENOLS SOLUBILIZED ARE MAINLY CONSTITUTED BY POLYFLAVONOIDS. DURING THIS TREATMENT THE POLYSACCHARIDE LOSSES ACCOUNT FOR LESS THAN 10 % OF THE INITIAL POLYSACCHARIDES IN BARK. THE LOSSES ARE DUE TO HEMICELLULOSE REMOVAL AND CELLULOSE CONTENT DOES NOT VARY. EXTRACTION CONDITIONS WILL BE OPTIMIZED AND STANDARDIZED IN THIS PROGRAMME. 3. UPGRADING OF THE TWO FRACTIONS. ROUGHLY 85 % OF THE MATERIAL DISSOLVED IN ALKALINE EXTRACTION CORRESPONDS TO FORMALDEHYDE - CONDENSABLE POLYPHENOLS WHICH HAVE BEEN IDENTIFIED AS ACTIVE AGENTS FOR THE PRODUCTION OF ADHESIVES. EXTRACTION CONDITIONS WILL BE STUDIED FOR FINDING AN EQUILIBRIUM BETWEEN POLYPHENOLS EXTRACTION AND POLYSACCHARIDES LOSSES. PARAMETERS SUCH AS TEMPERATURE, TIME ALKALI CONCENTRATION, ALKALI WILL BE TAKEN INTO ACCOUNT. THE DIFFERENT FRACTIONS WILL BE CONCENTRATED AND THEIR REACTIVITY WITH FORMALDEHYDE STUDIED. Fields of science natural scienceschemical sciencesorganic chemistryaldehydesnatural sciencesbiological sciencesbiochemistrybiomoleculescarbohydrates Programme(s) FP1-RAWMAT 3C - Research programme (EEC) on materials (raw materials and advanced materials), 1986-1989 Topic(s) Data not available Call for proposal Data not available Funding Scheme CSC - Cost-sharing contracts Coordinator FACULTE UNIVERSITAIRE DES SCIENCES AGRONOMIQUES DE GEMBLOUX Address Passage des deportes 2 Gembloux Belgium See on map Links Website Opens in new window EU contribution € 0,00 Participants (1) Sort alphabetically Sort by EU Contribution Expand all Collapse all UNIVERSIDAD DE SANTIAGO DE COMPOSTELA Spain EU contribution € 0,00 Address See on map
