Monday, May 5, 2008
11-07

Bioethanol subproducts as a basis of plant biorefinery

Jacqueline Destain1, Pascal Laurent2, Bassirou Ndoye1, Michel Paquot2, and Philippe Thonart1. (1) Bio-industry, Gembloux Agricultural University, Passage des Déportés,2, Gembloux, Belgium, (2) Industrial and biological chemistry, Gembloux Agricultural University, Passage des Déportés,2, Gembloux, Belgium

The philosophy of our research is built on the behaviour of non-sugar compounds from biomass during ethanolic fermentation. Saccharomyces cerevisiae industrially used to bioconvert sugar in ethanol, under anaerobic conditions, assimilates some of the compounds present in the fermentable juice( proteins, amino acids,...). But others compounds are not used by the yeast. They leave in the vinasse after ethanol distillation and are thus concentrated by the process. We will discuss the case of the beet-sugar roots by following the behaviour of betaine, saponins, raffinose in sugar juices ( raw juice, thin juice, thick juice ) and in vinasse. An attention will be given to some high added value products ( like betaine ) and the potentialities to use fermentation as a tool of purification in white chemistry.

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