33 documents found, page 1 of 4
Production of Oligosaccharides from Pine Nut Shells by Autohydrolysis
Torrado, Ivone; Dionísio, Ana; Fernandes, M. C.; Roseiro, Luisa B.; Carvalheiro, Florbela; Pereira, Helena; Duarte, Luís C.ABSTRACT: Pinus pinea nuts are commercial relevant Mediterranean edible forest nuts, with an increasing production and market value, whose industrial processing yields a lignocellulosic by-product, the pine nut shells, currently only used for combustion. Little research has been done on pine nut shells that could support a value-added application for this residue. This work studies for the first time the produc...
Strategies for the purification of hydroxytyrosol-rich extracts obtained from e...
Gómez Cruz, Irene; Contreras, Maria del Mar; Romero, Inmaculada; Ribeiro, Belina; Roseiro, Luisa B.; Duarte, Luís C.; Carvalheiro, FlorbelaABSTRACT: Exhausted olive pomace (EOP) is a residual biomass from which hydroxytyrosol can be recovered. This compound has applications in the food/pharma sectors, but its extraction yields complex extracts that require further purification for some applications. This work explores purification strategies based on membrane technology, liquid–liquid extraction (LLE), and solid-phase extraction with adsorbents an...
Effective Mild Ethanol-Based Organosolv Pre-Treatment for the Selective Valoriz...
Carvalheiro, Florbela; Duarte, Luís C.; Pires, Filipa; Van-Dúnem, Vanmira; Sanfins, Luís; Roseiro, Luisa B.; Gírio, FranciscoABSTRACT: Organosolv pre-treatments aiming to selectively remove and depolymerise lignin and hemicellulose and yield an easily digestible cellulose fraction are one of the potential options for industrial implementation within the biorefinery concept. However, the use of high temperatures and/or high catalyst concentrations is still hindering its wide adoption. In this work, mild temperature organosolv processe...
Hydrolates: a review on their volatiles composition, biological properties and ...
Tavares, Cláudia; Gameiro, José A.; Roseiro, Luisa B.; Figueiredo, Ana Cristina S.ABSTRACT: An hydrolate (also known as hydrosol, floral water, aromatic water, or herbal water) is a distillate which is a product of condensation obtained after an essential oil distillation isolation procedure. Hydrolates are colloidal suspensions composed of a continuous phase, the distilled water, and a dispersed phase, the emulsion of essential oil droplets and water-soluble components, namely oxygen-contai...
An integrated olive stone biorefinery based on a two-step fractionation strategy
Padilla-Rascón, Carmen; Carvalheiro, Florbela; Duarte, Luís C.; Roseiro, Luisa B.; Ruiz, Encarnación; Castro, EulogioABSTRACT: Olive stones (OS) constitute a waste lignocellulosic material produced by the olive oil industry in great amounts, that currently is only used as a low-value energy source for industrial or domestic boilers. Having in view its full valorization, this work proposes and validates an integrated strategy aiming to obtain three different streams of sugars / lignin-derived compounds. Dilute acid hydrolysis ...
Recovery of bioactive compounds from industrial exhausted olive pomace through ...
Gómez Cruz, Irene; Contreras, Maria del Mar; Carvalheiro, Florbela; Duarte, Luís C.; Roseiro, Luisa B.; Romero, Inmaculada; Castro, EulogioABSTRACT: Simple Summary Exhausted olive pomace (EOP) is the main residue of the pomace oil extraction industry, which is generated in large quantities and has limited applications. Thus, this study aimed to obtain bioactive compounds from EOP using ultrasound-assisted extraction as a potential first valorization step. Two types of devices were tested: bath- and probe-type UAE. The operational parameters were s...
Imidazole processing of wheat straw and eucalyptus residues: comparison of pre-...
Pereira, Pedro M. A.; Bernardo, Joana; Roseiro, Luisa B.; Gírio, Francisco; Lukasik, Rafal M.ABSTRACT: Biomass pre-treatment is a key step in achieving the economic competitiveness of biomass conversion. In the present work, an imidazole pre-treatment process was performed and evaluated using wheat straw and eucalyptus residues as model feedstocks for agriculture and forest-origin biomasses, respectively. Results showed that imidazole is an efficient pre-treatment agent; however, better results were ob...
Delignification of Cistus ladanifer Biomass by Organosolv and Alkali Processes
Alves Ferreira Caturra, Júnia Aparecida; Lourenço, Ana; Morgado, Francisca; Duarte, Luís C.; Roseiro, Luisa B.; Fernandes, M. C.; Pereira, HelenaABSTRACT: Residues of Cistus ladanifer obtained after commercial steam distillation for essential oil production were evaluated to produce cellulose enriched solids and added-value lignin-derived compounds. The delignification of extracted (CLRext) and extracted and hydrothermally pretreated biomass (CLRtreat) was studied using two organosolv processes, ethanol/water mixtures (EO), and alkali-catalyzed glycerol...
Desenvolvimento de processos de pré-tratamento da biomassa para a separação efi...
Carvalheiro, Florbela; Lukasik, Rafal M.; Duarte, Luís C.; Roseiro, Luisa B.; Ribeiro, Belina; Marques, Susana; Bernardo, Joana; Van-Dúnem, VanmiraRESUMO: O fracionamento da biomassa é um dos principais pontos críticos no desenvolvimento das biorrefinarias. Neste trabalho, são apresentadas três estratégias inovadoras com vista à separação seletiva das frações de celulose, hemicelulose e lenhina, utilizando compostos orgânicos, geralmente em solução aquosa: i) utilização de líquidos iónicos (ILs) em particular [emim][OAc] e [emim][HSO4]); ii) processos org...
Bioproducts from forest biomass: Essential oils and hydrolates from wastes of C...
Tavares, Claudia S.; Martins, Alice; Faleiro, L; Miguel, Maria; Duarte, Luis C.; Gameiro, Jose A.; Roseiro, Luisa B.; Cristina Figueiredo, A.Unattended forest wastes are, among others, a potential source of wildfires, as well as a growth media for forest pests. As a way of lowering the detrimental effect of these wastes, it is important to convert these under-valued resources into a value-generating market forest wastes use. Essential oils (EOs) and hydrolates (Hs) from Cupressus lusitanica and Cistus ladanifer waste products, resulting from forest ...