Guevara-Bravo, Carlos, Acevedo, José, and Peláez-Jaramillo, Carlos
Biotecnología en el Sector Agropecuario y Agroindustrial. jul-dic2014, Vol. 12 Issue 2, p151-159. 9p.
Was isolated and characterized a flocculant yeast strain Saccharomyces cerevisiae (LEG-06), to ferment banana juice, extracted under basic conditions. Yield ethanol was compared with commercial yeasts and were also evaluated the effects of pH and neutralizing agent. Additionally, the effect on efficiency of 10 successive fermentations using the same yeast. Finally, the fermentation was scaled in a 40 L tubular reactor with mechanical agitation and the kinetic parameters were determined from yeast. Ideal conditions were: pH 5,5 using citric acid as a neutralizer, 23,8 g/L yeast 14,5°Brix. The efficiency was between 82-84% and the optimum pH between 5,5 and 6,0 flocculation. The concentration of ethanol obtained under optimum conditions was 7,5%. These results demonstrate the yeast as the methodology used, have the right characteristics and desired to develop a process to pilot plant for the production of ethanol from banana rejection. [ABSTRACT FROM AUTHOR]
Benítez, Ricardo, Calero, Víctor, Peña, Enrique, and Martín, Jaime
Biotecnología en el Sector Agropecuario y Agroindustrial. jul-dic2011, Vol. 9 Issue 2, p66-73. 8p.
CHROMIUM, HYACINTHS, WATER hyacinth, EUTROPHICATION, METAL toxicology, FOOD chains, and MACROPHYTES
Eichhornia crassipes is a fast growing plant distributed in almost all tropical countries, which can tolerate conditions of metal contamination or eutrophication of bodies of lentic and lotic waters. This plant has become an environmental problem, however, has sparked interest in the treatment of metal pollution in agricultural soils and water bodies. The toxicity of metals is a serious problem with this reasoning, since it affects the storage capacity and transmission into the food chain. In this study we evaluated the behavior of the rates of accumulation of chromium in aquatic macrophyte Eichhornia crassipes, at concentrations of 30, 60 and 90 mg/L, using a randomized experimental design with control and three replicates per level. Studies carried out in glass aquaria, showed sites of accumulation of chromium in the plant, establishing the kinetics of accumulation. [ABSTRACT FROM AUTHOR]