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Sete Lagoas, Brazil

Fernandes G.,Federal University of Uberlandia | Fernandes G.,Novo A/S | Braga T.G.,Federal University of Uberlandia | Fischer J.,Federal University of Uberlandia | And 3 more authors.
Renewable Energy

Sweet sorghum was investigated to an alternate feedstock for fuel ethanol production. juices from 4 sorghum varieties (BRS 506, BRS 508, BRS 509, BRS 511 and BRS); all developed by Embrapa (Brazilian Agricultural Research Corporation) Maize and Sorghum) were evaluated for sugar, starch and nutrient contents and theoretical ethanol yields. The levels of nitrogen, phosphorus, calcium, magnesium, starch and sugars (glucose, fructose and sucrose) were measured weekly over a period of 70 days. Fermentations were performed using yeast Saccharomyces cerevisiae. BRS 508, BRS 509 and BRS 511 showed potential to be useful for industrial applications for maturities exceeding 30 days. BRS 511 showed the highest sugar production, with levels higher than 140g/L during the majority of the experiment and reaching a maximum of 191g/L. All varieties showed similar behaviors with respect to nutrient content, which was characterized by a decrease in nutrient concentrations over the period analyzed. Juice from BRS 508 was successfully fermented within 8h with a productivity (9.0g/Lh) and yield (90.5% of theoretical) similar to those observed for sugar cane juice. © 2014 Elsevier Ltd. Source

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