The aim of our study is to consider the sugar-beet as a model for a bio-refinery concept.
The purpose is to increase the value of this agricultural production by using different technologies in order to recover a maximum of  interesting components.
The whole vegetable, i.e. leaves and root, can be used to produce different products of low and high values. An integrate flow sheet of the bio-refinery concept developed on the sugar-beet will be presented.
In parallel of the classical sugar manufacturing process, we propose to develop new technologies dealing with extraction of components from leaves and roots,  enzymatic bioconversion,  fermentation of sugar juice, chemicals reactions.
The products are presented in function of  quantity,  price but also  potential applications: sugar, bioethanol, green aromas, betaine, saponins...
Focused research concern mostly two aspects:
-         enzymatic bioconversion of fatty acids from leaves into green aromas,
-         influence of root components others than sucrose on bioethanol fermentation.
Preliminary results on these both appoaches will be discussed.