Encontrados 13 documentos, a visualizar página 1 de 2
Biorefinery valorization of autohydrolysis wheat straw hemicellulose to be appl...
Ruiz, Héctor A.; Cerqueira, M. A.; Silva, Hélder D.; Rodríguez-Jasso, Rosa María; Vicente, A. A.; Teixeira, J. A.The aims of this study were the extraction of hemicellulose from wheat straw (WS) and its utilization in the reinforcement of a κ-carrageenan/locust bean gum (κ-car/LBG) polymeric blend films (PBFs). WS hemicellulose extraction was performed under autohydrolysis process and hemicellulose extracted (HE) under optimum condition was used in PBFs. PBFs were prepared varying different proportions of HE into the κ-ca...
Hydrothermal processing, as an alternative for upgrading agriculture residues a...
Ruiz, Héctor A.; Rodríguez-Jasso, Rosa María; Fernandes, Bruno Daniel; Vicente, A. A.; Teixeira, J. A.The concept of a biorefinery that integrates processes and technologies for biomass conversion demands efficient utilization of all components. Hydrothermal processing is a potential clean technology to convert raw materials such as lignocellulosic materials and aquatic biomass into bioenergy and high added-value chemicals. In this technology, water at high temperatures and pressures is applied for hydrolysis, ...
Fractionation of eucalyptus globulus wood by glycerol-water pretreatment : opti...
Romaní, Aloia; Ruíz, Héctor A.; Pereira, Francisco B.; Domingues, Lucília; Teixeira, J. A.A glycerol-organosolv process can be a good alternative for Eucalyptus wood fractionation into its main compounds, improving the enzymatic saccharification of the cellulose. A study of process variables - glycerol−water percent content, temperature, and process time - was carried out using a Box-Behnken experimental design. The cellulose obtained from pretreated solids was recovered almost quantitatively, leadi...
A new approach on brewer's spent grains treatment and potential use as lignocel...
Pires, Eduardo J.; Ruiz, Héctor A.; Teixeira, J. A.; Vicente, A. A.The major objective of this work is to improve the pretreatments of brewer’s spent grains (BSG) aiming at their use as a source for lignocellulosic yeast carriers (LCYC) production. Therefore, several pretreatments of BSG have been designed aiming at obtaining various yeast carriers, differing on their physicochemical composition. Cellulose, hemicellulose, lignin, fat, protein, and ash content were determined f...
Kinetic modeling of enzymatic saccharification using wheat straw pretreated und...
Ruiz, Héctor A.; Vicente, A. A.; Teixeira, J. A.The enzymatic saccharification kinetics of untreated wheat straw, pretreated solids obtained by a sequence of autohydrolysis (solubilization of hemicellulose) and organosolv (solubilization of lignin) were studied together with two pure cellulose model substrates, filter paper and Avicel. Two kinetic models for glucose production were compared and its kinetic constants calculated. According to the obtained resu...
Bioethanol production from hydrothermal pretreated wheat straw by a flocculatin...
Ruíz, Héctor A.; Silva, Daniel P.; Ruzene, Denise S.; Lima, Luís; Vicente, A. A.; Teixeira, J. A.Wheat straw is nowadays being considered a potential lignocellulose raw material for fuel ethanol production of second generation and as an alternative to conventional fuel ethanol production from cereal crops. In the present study, hydrothermal pretreated wheat straw with high cellulose content (>60%) at 180 °C for 30 min was used as substrate in simultaneous saccharification and fermentation (SSF) process for...
Production of xylanase and β-xylosidase from autohydrolysis liquor of corncob u...
Michelin, Michele; Polizeli, Maria de Lourdes T. M.; Ruzene, Denise S.; Silva, Daniel Pereira da; Ruiz, Héctor A.; Vicente, A. A.; Jorge, João A.Agroindustrial residues are materials often rich in cellulose and hemicellulose. The use of these substrates for the microbial production of enzymes of industrial interest is mainly due to their high availability associated with their low cost. In this work, corncob (CCs) particles decomposed to soluble compounds (liquor) were incorporated in the microbial growth medium through autohydrolysis, as a strategy to ...
Effect of hemicellulose liquid phase on the enzymatic hydrolysis of autohydroly...
Romaní, Aloia; Ruíz, Héctor A.; Pereira, Francisco B.; Domingues, Lucília; Teixeira, J. A.In this work, Eucalyptus globulus wood (EGW) was pretreated under autohydrolysis process at 210 and 220 ºC, obtaining a pretreated solid with high cellulose content. Moreover, the effect of the hemicellulosic liquid phase (HLP) addition on the enzymatic hydrolysis was studied. When the enzymatic hydrolysis was performed without addition of HLP, 87.38 and 107.46 g/L of glucose was obtained for 210 ºC and 220 ºC,...
Evaluation of a hydrothermal process for pretreatment of wheat straw : effect o...
Ruiz, Héctor A.; Ruzene, Denise S.; Silva, Daniel Pereira da; Quintas, Mafalda A. C.; Vicente, A. A.; Teixeira, J. A.Hydrothermal processes are an eco-friendly processes that provide an interesting alternative for chemical utilization of lignocellulosic materials, in which water and crop residues are the only reagents. In this work the effect of process conditions (size distribution of the wheat straw, temperature and time) was evaluated against production of fermentable products. RESULTS: The use of milled wheat straw fracti...
Development and characterization of an environmentallyfriendly process sequence...
Ruiz, Héctor A.; Ruzene, Denise S.; Silva, Daniel P.; Silva, Fernando F. Macieira da; Vicente, A. A.; Teixeira, J. A.The present work describes the delignification of wheat straw through an environmentally friendly process resulting from sequential application of autohydrolysis and organosolv processes. Wheat straw autohydrolysis was performed at 180°C during 30 min with a liquid–solid ratio of 10 (v/w); under these conditions, a solubilization of 44% of the original xylan, with 78% of sugars as xylooligosaccharides of the su...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||