https://repositorio.ufu.br/handle/123456789/19178 2026-07-18T19:55:26Z 2026-07-18T19:55:26Z https://repositorio.ufu.br/handle/123456789/48839 2026-07-15T06:26:19Z 2026-03-24T00:00:00Z

Title: Estudo do pré-tratamento de bagaço de cana-de-açúcar e sabugo de milho assistido por ultrassom e micro-ondas utilizando solventes eutéticos profundos Abstract: The growing interest in alternative sustainable energy sources has driven research into biofuel production from agro-industrial residues. Second-generation (2G) ethanol, derived from lignocellulosic biomass, emerges as a promising alternative due to its lower environmental impact and non-competition with food production. This study evaluated the potential of sugarcane bagasse and maize cob for ethanol production after microwave-assisted (15 min, 110–150ºC) and ultrasound (10 min) pretreatment using deep eutectic solvents (DES). The systems used were Choline Chloride with Lactic Acid (ChCl: Lactic Acid) and Choline Chloride with Glycerol (ChCl: Glycerol) in a 1:2 ratio. The pretreatments promoted substantial lignin and hemicellulose removal, with ChCl: Glycerol achieving the highest delignification rates of 73.23% for sugarcane bagasse and 75.79% for maize cob. Significant enrichment of the cellulose fraction was observed, increasing cellulose availability up to 74.57% in sugarcane bagasse (ChCl: Lactic Acid) and 53.69% in maize cob (ChCl: Lactic Acid). XRD, FTIR, and SEM analyses confirmed increased porosity and crystallinity index, indicating efficient removal of amorphous components and preservation of cellulose type I. In the fed-batch enzymatic hydrolysis step, high solid loading enhanced sugar release, with bagasse treated with glycerol reaching 112.15 g/L of total reducing sugars (TRS) using ChCl: Glycerol. Alcoholic fermentation with Saccharomyces cerevisiae showed rapid glucose consumption within the first 24 h, with maximum initial productivity of 2.44 g/L for sugarcane bagasse and 1.29 g/L for maize cob pretreated with ChCl: Glycerol. These results indicate that the use of DES, especially ChCl: Glycerol, combined with ultrasonic and microwave treatment, is a highly effective and sustainable route for valorizing agro-industrial residues in 2G ethanol production.

2026-03-24T00:00:00Z https://repositorio.ufu.br/handle/123456789/47924 2025-12-23T06:20:08Z 2025-05-15T00:00:00Z

Title: Novas leveduras para produção de cerveja: não cerevisiae, farmhouse e híbridas Abstract: Saccharomyces cerevisiae has been traditionally used in beer production due to its high fermentation efficiency and predictability. However, with the growth of the craft beer market and the search for sensory and technological innovation, new yeast species have gained attention. This monograph presents a literature review on the use of non-conventional yeasts in beer production, focusing on non-cerevisiae species, hybrid strains, and traditional farmhouse yeasts such as Kveik. Microbiological, fermentative, and sensory aspects of these yeasts are discussed, as well as their potential and challenges for industrial application. The analysis revealed that species such as Brettanomyces, Lachancea, Candida, and Pichia have desirable characteristics for style diversification, while hybrids offer the combined advantages of different lineages. Kveik yeasts stand out for their fast fermentation at high temperatures and their unique sensory profile. It is concluded that the exploration of these new yeasts represents a promising trend in brewing biotechnology, capable of enhancing quality and distinctiveness of the final product and broadening the technical capabilities of brewers.

2025-05-15T00:00:00Z https://repositorio.ufu.br/handle/123456789/47814 2025-12-09T06:20:28Z 2025-09-26T00:00:00Z

Title: Desenvolvimento de ferramenta diagnostica por meio de biomarcadores espectrais para monitoramento do bem-estar animal em biotérios

2025-09-26T00:00:00Z https://repositorio.ufu.br/handle/123456789/47744 2025-11-26T06:19:14Z 2025-05-15T00:00:00Z

Title: Uso de carvão ativado de babaçu na adsorção do corante fast green em efluentes sintéticos Abstract: The constant increase in the pollution of rivers and lakes by industrial waste containing synthetic dyes has driven the search for eco-friendly and affordable solutions to address these pollutants. In this context, this research aimed to evaluate the efficiency of activated carbon produced from the shell of the babaçu coconut (Attalea speciosa) in the adsorption of the Fast Green dye, an anionic dye widely used in the textile and food industries. The activated carbon was obtained through physical activation with CO₂ and characterized in terms of pore structure, surface area, and functional groups. Batch adsorption experiments were carried out by varying the initial dye concentration, contact time, and adsorbent mass. The data obtained were analyzed using kinetic and isotherm models, with emphasis on the Langmuir and Freundlich models. The results indicated that babaçu-based activated carbon exhibited a high adsorption capacity, reaching up to 93.41% removal of the Fast Green dye under the best experimental conditions, corresponding to acidic pH, prolonged contact time, and greater adsorbent mass. The adsorption kinetics predominantly followed the pseudosecond-order model, while the Langmuir isotherm provided the best fit to the data, suggesting monolayer adsorption on a homogeneous surface. The pH analysis showed a significant influence on removal efficiency, with better performance under slightly acidic conditions. Based on these results, babassu activated carbon represents a promising, low-cost, and environmentally sustainable alternative for the treatment of effluents containing synthetic dyes, contributing to the reuse of agro-industrial residues and to the reduction of environmental impacts caused by water pollution.

2025-05-15T00:00:00Z