Navegando por Autor "Fernandes, F. A. N."
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Artigo Evaluation of composition, characterization and enzymatic hydrolysis of pretreated sugar cane bagasse(Brazilian Journal of Chemical Engineering, 2015) Santos, Everaldo Silvino dos; Guilherme, Alexandre de Araujo; Dantas, P. V. F.; Fernandes, F. A. N.; Macedo, Gorete Ribeiro deGlucose production from sugarcane bagasse was investigated. Sugarcane bagasse was pretreated by four different methods: combined acid and alkaline, combined hydrothermal and alkaline, alkaline, and peroxide pretreatment. The raw material and the solid fraction of the pretreated bagasse were characterized according to the composition, SEM, X-ray and FTIR analysis. Glucose production after enzymatic hydrolysis of the pretreated bagasse was also evaluated. All these results were used to develop relationships between these parameters to understand better and improve this process. The results showed that the alkaline pretreatment, using sodium hydroxide, was able to reduce the amount of lignin in the sugarcane bagasse, leading to a better performance in glucose production after the pretreatment process and enzymatic hydrolysis. A good xylose production was also observedArtigo Pretreatments and enzymatic hydrolysis of sugarcane bagasse aiming at the enhancement of the yield of glucose and xylose(Departamento de Engenharia Química, 2017) Santos, Everaldo Silvino dos; Guilherme, A. de A.; Dantas, P. V. F.; Soares, J. C. J.; Fernandes, F. A. N.; Macedo, Gorete Ribeiro deThis work studied the enzymatic hydrolysis of sugarcane bagasse aiming at the production of glucose and xylose. The bagasse was subjected to two different pretreatments: combined acid and lkalinepretreatment and hydrogen peroxidepretreatment. The enzymatic hydrolysis was optimized and a kinetic study was carried out in a stirred tank reactor (STR) in batch mode. Optimal conditions were obtained by subjecting the bagasse to the hydrogen peroxide pretreatment followed by enzymatic hydrolysis. The addition of xylanases to the enzymatic mixture improved the production of fermentable sugars by 48%