Monday, May 5, 2008
6-46

Sugar beet leaves valorisation through green notes production from linseed oil

Cédric Gigot1, Rabetafika H. Rabetafika2, Marie-Laure Fauconnier3, Jacqueline Destain1, Marc Ongena1, Jean-Marc Aldric4, Wathelet JP Wathelet2, Dujardin P. Dujardin3, and Philippe Thonart1. (1) Bio-industries, Faculté Universitaire des Sciences Agronomiques de Gembloux, Passage des Déportés, 2, Gembloux, 5030, Belgium, (2) Chimie Generale, Faculté Universitaire des Sciences Agronomiques de Gembloux, Passage des Déportés, 2, Gembloux, 5030, Belgium, (3) Biologie végétale, Faculté Universitaire des Sciences Agronomiques de Gembloux, Passage des Déportés, 2, Gembloux, 5030, Belgium, (4) Unité de bioindustries, Faculté des Sciences Agronomiques de Gembloux, 2 Passage des déportés, Gembloux, Belgium

High levels of hydroperoxide lyase activities were found in sugar beet leaves. This unstable enzyme of the lipoxygenase pathway may be a way of valorisation for leaves. Combination of beet lyases and low cost substrate of free unsaturated fatty acids, like linseed oil, can lead to high value production of natural green notes compounds, mainly E-2-hexenal. This paper will describe a complete industrial process production, based on the natural metabolic synthesis of green notes in response to stress in plants. Free fatty acids, released by hydrolysis of vegetal oil, can be in a first step transformed in hydroperoxides under lipoxygenase action and further metabolized in aldehydes and alcohols by hydroperoxide lyase. Global transformation of oil to E-2-hexenal reached yields of 4% and aromas can be recovered by hydrophobic resin adsorption and/or distillation.

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