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Lignocelulitic compounds have a high content of fermentable material, are renewable and have a net CO2 emission close to 0 and as such a good alternative towards energy security, unstable prices and contamination from fossil fuels. Access to fermentable components, by fungi or enzymes is the main limitation to fermentation technology and only then biofuels like ethanol or biodiesel could achieve competitive conditions against oil derivatives. To increase the availability of fermentable compounds, the efficiency of three methods of lipid extraction was studies from beet bagasse, either fresh or dehydrated: lime, ammonia, and sacharification with simultaneous fermentation. Substrates were enriched with ultrapectinase and cellulase for polisacharides hydrolyses, after wich were fermented in solid state with the fungi Umbelopsis isabellina for lipid accumulation. Best treatment was sacharification with simultaneous fermentation yielding a 6% lipid per gram of initial dry matter. More research on fermentation control, separation and microbial biomass is needed and taking into account variables such as temperature, pH, water activity, redox potential, particle size and C/N ratio.

Producción de biodiesel mediante fermentación en estado sólido de compuestos lignocelulósicos derivados del bagazo de remolacha