256 documents found, page 1 of 26
Fractionation of macroalgae carbohydrates using hydrothermal and dilute inorgan...
Martins, Pedro L.; Andrade, Cristiana; Duarte, Luís; Reis, Alberto; Pereira, Helena; Carvalheiro, FlorbelaABSTRACT: Furans are among the most important compounds derived from biomass, providing conversion pathways for sustainable alternatives to petroleum-based fuels and materials. Furfural, 5-hydroxymethylfurfural (5-HMF), and 5-methylfurfural (5-MF) are furans that can be obtained by carbohydrate dehydration under acidic conditions at elevated temperature and pressure. One of the mechanisms to produce these compo...
Bark-based biorefineries: anatomical and chemical characterization of the bark ...
Şen, Ali Umut; Simões, Rita; Yücedağ, Cengiz; Quilhó, Teresa; Sousa, Vicelina; Miranda, Isabel M.; Fernandes, Ângela; Pereira, HelenaThe detailed anatomical and chemical features of the bark from endemic Quercus vulcanica in Turkey are reported here for the first time and discussed in the perspective of integration into a bark-based biorefinery system. The bark of Q. vulcanica trees was collected and studied through observations using light and scanning electron microscopy, wet-chemical analysis, inorganic elemental and FTIR analyses, GC-MS ...
Pine Nutshells and Their Biochars as Sources of Chemicals, Fuels, Activated Car...
Şen, Ali Umut; Rodrigues, João F.G.; Almeida, Daiana; Fernandes, Ângela; Gonçalves, Margarida; Martins, Marta; Santos, Diogo M.F.; Pereira, HelenaPine nutshells (PNSs) are lignocellulosic waste materials with limited use in domestic heating. However, a biorefinery approach may be applied to fractionate PNSs and produce chemicals, materials, and improved solid fuels. In this study, we fractionated PNSs and produced antioxidant extracts, lignins, polysaccharides, chars, and activated carbons and analyzed their potential applications. Pyrolytic kinetic mode...
An inside look at Primary Healthcare
Simãozinho, Paula; Faria, Margarida; Sobral, Ana Lúcia; Neves, Cristina; Moreira, Elisabete; Costa, Anabela; Martins, Ana; Pereira, HelenaPrimary Healthcare Working Group - Radiology; Grupo de Trabalho dos Cuidados de Saúde Primários - Radiologia
Radiographer Role and Future in Primary Healthcare
Simãozinho, Paula; Faria, Margarida; Sobral, Ana Lúcia; Neves, Cristina; Moreira, Elisabete; Costa, Anabela; Martins, Ana; Pereira, HelenaPrimary Healthcare Working Group - Radiology; Grupo de Trabalho dos Cuidados de Saúde Primários - Radiologia
Interview
Simãozinho, Paula; Faria, Margarida; Sobral, Ana Lúcia; Neves, Cristina; Moreira, Elisabete; Costa, Anabela; Martins, Ana; Pereira, HelenaPrimary Healthcare Working Group - Radiology; Grupo de Trabalho dos Cuidados de Saúde Primários - Radiologia
Microwave-assisted hydrothermal processing of pine nut shells for oligosacchari...
Torrado, Ivone; Neves, Beatriz Guapo; Fernandes, M. C.; Carvalheiro, Florbela; Pereira, Helena; Duarte, Luís C.ABSTRACT: Pine nut shells, a biomass residue from the Mediterranean Pinus pinea pine nut industrial processing, were treated by microwave-assisted autohydrolysis to produce xylo-oligosaccharides. Microwave-assisted processes provide alternative heating that may reduce energy input and increase overall process efficiency. The autohydrolysis treatments were performed under isothermal and non-isothermal operations...
Evaluation of different fractionation methods for the simultaneous protein and ...
Martins, Pedro L.; Duarte, Luís C.; Pereira, Helena; Reis, Alberto; Carvalheiro, FlorbelaABSTRACT: The production of high-value products from microalgae, one of the preferred emerging biorefineries' feedstocks, relies on the crucial step of biomass fractionation. In this work, the fractionation of Chlorella vulgaris and Scenedesmus obliquus biomass was tested for protein extraction using a wide range of physical, chemical, and enzymatic treatment combinations, including ultrasound, cell homogenizer...
Effect of Bark Biochars on Properties of Steam-Activated Carbons
Şen, Umut; Nobre, Catarina; Martins, Marta; Gonçalves, Margarida; Pereira, HelenaBark is a heterogeneous solid material comprising mainly of phloem and cork fractions. These fractions differ in chemical composition and anatomical structure, and value-added activated carbons produced from these fractions have different surface properties. Low-temperature pyrolysis was shown to be a promising method for producing activated carbon precursors from bark fractions at higher yields than convention...
Microwave-assisted hydrothermal processing of pine nut shells for oligosacchari...
Torrado, Ivone; Neves, Beatriz Guapo; Fernandes, Maria da Conceição; Carvalheiro, Florbela; Pereira, Helena; Duarte, Luís C.Pine nut shells, a biomass residue from the Mediterranean Pinus pinea pine nut industrial processing, were treated by microwave- assisted autohydrolysis to produce xylo-oligosaccharides. Microwave-assisted processes provide alternative heating that may reduce energy input and increase overall process efficiency. The autohydrolysis treatments were performed under isothermal and non-isothermal operations within a...