Giovanni Aleixo Batista

Given the growing demand for sustainable energy sources, the search for alternatives to fossil fuels has intensified, with particular emphasis on the reuse of agro-industrial waste. Among these, coffee husk (Coffea arabica), widely produced in Brazil, presents high energy potential and availability. A strategy for the valorization of this residue is briquetting, a compaction process that transforms biomass into a solid biofuel with high energy density, good combustion efficiency, and ease of transport and storage. In this context, the aim of this study was to propose a renewable fuel option and evaluate its energy potential, by means of the production and carbonization of briquettes made from coffee husks and different binder concentrations (crude glycerin). Cold briquetting was performed in a mold machined for this study. The effects of the binder concentration (0 % to 25 % w/w) on moisture, volatiles, fixed carbon and ash contents, the heating value, bulk density of briquettes, diametrical compression strength, diametral expansion, longitudinal expansion and carbonization yields was assessed, using a completely randomized design with three replicates in each treatment. Carbonization was carried out at 450 ºC. The addition of 5% (w/w) binder in the briquettes resulted in a higher compressive strength (78.99 kPa). Increases in glycerin concentration reduced the fragmentation of compacted material, but resulted in a reduction in the calorific value, increase in moisture and volatile contents, and expansion of the briquettes. The gravimetric yields were not significantly affected (p>0.05) by the addition of glycerin, but the charcoal produced from briquettes with the binder showed less fragmentation. The briquettes and charcoal produced showed potential for use in the generation of energy, and production of activated carbon and biochar.

Anais do I Simpósio Online Sulamericano de Tecnologia, Engenharia e Ciência de Alimentos (978-65-5941-657-8) - Captura Cromatográfica Das Proteínas Do Extrato Aquoso Das Folhas De Momordica Charantia L. Utilizando Adsorventes Monolíticos Supermacroporosos

O café representa um setor economicamente importante sendo uma das principais commodities nacionais, uma vez que o Brasil é mundialmente, o maior produtor e exportador de café. Durante o processamento via úmida se utiliza água com a finalidade de facilitar o processamento e retirar a mucilagem para evitar a fermentação dos grãos gerando uma água residuária com alta teor de matérias orgânicas. Assim, o tratamento adequado da água residuária do café torna-se necessário, uma vez que se lançada ao meio ambiente sem tratamento pode causar sérios impactos. Dessa forma, o objetivo deste estudo foi avaliar a utilização de fungos filamentosos na degradação da matéria orgânica presente na água residuária do processamento úmido do café. A água residuária do processamento úmido do café (Coffea arábica L.) utilizada no experimento foi obtida em uma propriedade rural localizada no município Campestre, Minas Gerais e os isolados utilizados foram CCDCA 10495 (Aspergillus foetidus); A.niger 00194 (Aspergillus niger); CCDCA 10232 (Aspergillus niger) e CCDCA 11402 (Penicillium biliae). Os isolados A. niger 00194 (Aspergillus niger) e CCDCA 10495 (Aspergillus foetidus) foram os que microrganismos que degradaram, com mais eficiência, a matéria orgânica presente na água residuária do café após 196 horas de fermentação.

Whey protein has high biological value and functional properties. Therefore, it is necessary to develop methods to recover this valuable protein and minimize the environmental impacts. Adsorptive processes using alternative adsorbents from agroindustrial waste increase the number of alternatives for adequate final disposal of the waste and add value. The aim of this study was to develop a mesoporous activated carbon (AC) from defective coffee beans (DCB) for the adsorption of fresh whey protein. The morphological structure of the adsorbent produced was characterized, and both Raman spectroscopy, FTIR and thermal analyses were performed; and the effect of pH on the adsorption capacity (q, mg g-1) was evaluated. The characterization showed that: the AC exhibited a porous size between 33 and 43 Å, corresponding to mesoporous materials; the crystallite size (La) of AC was estimated at 9.31 ± 0.14 nm; the highest adsorption capacity value (239.1781 mg g-1) was achieved at pH 2.5 and 25ºC; and the point of zero charge of the adsorbent was at pH 2.0. The pseudo first-order model fit best to the experimental results (R2 > 0.99) of whey protein adsorption onto activated carbon, and the Langmuir model was the most appropriate to represent the experimental data, with a maximum adsorption capacity of 378.4380 mg g-1, demonstrating the potential of AC obtained from DCB to adsorb fresh whey protein.

O objetivo deste trabalho foi desenvolver um criogel funcionalizado compolietilenoimina(PEI) visando a adsorção da albumina do soro bovino (BSA) porc...

O objetivo deste trabalho foi capturar as proteínas do extrato de ora-pronobis(OPN, Pereskia aculeata Miller) por cromatografia de afinidade, utilizan...

This study evaluated the protein recovery from extract of Barbados gooseberry leaves by the synergistic effect of salting out and isoelectric precipitation using a factorial design, varying salt type ((NH4)2SO4, NaCl and KCl), salt concentration and temperature. Temperature elevation increased salting out effect. The optimum salt concentration was 0.5 mol/L for (NH4)2SO4 (66%), 1.5 mol/L for KCl (58%), and 2.5 for NaCl (62%). Research on isoelectric precipitation were performed. The most effective condition was found at 85 °C, using (NH4)2SO4 at 0.8 mol/L to 1.0 mol/L and pH = 1.0. Results showed the effectiveness of these effects on protein precipitation. Este estudio evaluó la recuperación de proteínas del extracto de hojas de enredadera limón por el efecto sinérgico de la remoción de sales y la precipitación isoeléctrica con el uso de un diseño factorial que varió el tipo de sal ((NH4)2SO4, NaCl y KCl), la concentración de sal y la temperatura. La elevación de la temperatura aumentó el efecto de la remoción de sales. La concentración óptima de sal fue de 0,5 mol/L para (NH4)2SO4 (66%), 1,5 mol/L para KCl (58%) y 2,5 mol/L para NaCl (62%). Se realizaron investigaciones sobre la precipitación isoeléctrica. La condición más efectiva se encontró a 85 °C por el uso de (NH4)2SO4 de 0,8 mol/L a 1,0 mol/L y pH = 1,0. Los resultados mostraron la eficacia de estos efectos sobre la precipitación de proteínas.