INVESTIGADORES
CLEMENTZ Adriana Laura
artículos
Título:
Optimization of ethanol fermentation from discarded carrots using immobilized Saccharomyces cerevisiae
Autor/es:
CLEMENTZ ADRIANA; AIMARETTI NORA; MANUALE DEBORA; CODEVILLA AGUST├ŹN; YORI JUAN CARLOS
Revista:
International Journal of Energy and Environmental Engineering
Editorial:
Springer Berlin Heidelberg
Referencias:
Año: 2015 vol. 6 p. 129 - 135
ISSN:
2008-9163
Resumen:
Discarded carrots are a valuable source ofbiomass amenable for valorization. Their use as rawmaterial for ethanol production by fermentation, usingyeasts immobilized in Calcium alginate, was proposed. Thebiocatalyst immobilization method, the existence of internaland external mass transfer limitations, the effect of theinitial pH and the reuse of immobilized yeasts were particularlyevaluated. Results indicate that beads made with a2 % solution of Sodium alginate and a 30 % solution ofSaccharomyces cerevisiae were strong enough to allow anefficient nutrient transfer into the matrix and to prevent cellleaking. A stirring rate of 200 rpm was needed to avoidexternal mass transfer limitations. These beads were usedin three successive fermentations. An initial pH of 5.5reached the best fermentation parameters. Non-enriched,non-sterile carrot must was fermented through immobilizedyeasts; and values of ethanol concentration (29.9 g L-1),Yp/s (0.409 g g-1), and productivity (7.45 g L-1 h-1) wereobtained. These values were similar to those registeredwhen free cells were used.