Analusis 28, 960-965 (2000)
DOI: 10.1051/analusis:2000162

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

F. Doussot¹, P. Pardon¹, J. Dedier² and B. De Jeso<sup>1

1</sup>  Institut du Pin, Université Bordeaux I, 351 cours de la Libération, 33405 Talence Cedex, France
²  Laboratoire de Chimie des Substances Végétales (LCSV), Université Bordeaux I, 351 cours de la Libération, 33405 Talence Cedex, France

(Received July 25, 2000; revised October 24, 2000; accepted October 25, 2000.)

Abstract
Dry extract, ellagitanins, free ellagic acid, whisky-lactone, eugenol and vanillin have been quantified for a sample set of 61 pedunculate oaks (Quercus robur L.) and 72 sessile oaks (Quercus petraea Liebl.) originating from 6 different forests. Despite a very high interindividual variability, pedunculate 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 compounds level is poorly correlated to the grain (ring width). Regarding cambial age, it might have its significance but lack of scientific data could not permit to conclude in that sense. Our results suggest that cooperage oak selection should be based on a species-provenance combination rather than on the grain or the provenance solely.

Key words: Oak -- extractible -- species -- variabilty.


© EDP Sciences, Wiley-VCH 2000