Individual, species and geographic origin influence on cooperage oak extractible content (Quercus robur L. and Quercus petraea Liebl.)

Dry extract, ellagitanins, free ellagic acid, whisky-lactone, eugenol and v anillin have been quantified for a sample set of 61 pedunculate oaks (Querc us robur L.) and 72 sessile oaks (Quercus petraea Liebl.) originating from 6 different forests. Despite a very high interindividual variability, pedun culate oak shows higher level of dry extract, ellagitanins and free ellagic acid but lower level in volatil compounds compared to sessile oak. Inside a same species, differences between forests are less marked. Extractible co mpounds level is poorly correlated to the grain (ring width). Regarding cam bial age, it might have its significance but lack of scientific data could not permit to conclude in that sense. Our results suggest that cooperage oa k selection should be based on a species-provenance combination rather than on the grain or the provenance solely.