7 documents found, page 1 of 1
From sulfite liquor to vanillin: effect of crystallization process on the yield...
Carina Costa; Casimiro, FM; Manrique, YA; Rodrigues, AEDifferent approaches for vanillin crystallization were performed using an aqueous solution, with low concentrations of this potential food and pharmaceutical phenolic compound, obtained from adsorption/desorption experiments applied to an oxidized solution of lignin isolated from softwood sulfite liquor. The process yield and purity of the vanillin crystals were determined, and the thermal stability of the two ...
Competitive Adsorption of Vanillin, Vanillic Acid, and Acetovanillone onto SP70...
Rios, AG; Carina Costa; Ana M. Ribeiro; Rodrigues, AE; Ferreira, AFPIn this work, the recovery of phenolic monomers obtained from the oxidative depolymerization of lignin was studied. The adsorption of aromatic aldehydes, acids, and ketones using a macroporous polymeric resin, Sepabeads SP700, was assessed experimentally. Batch experiments were performed by using aqueous model solutions for each phenolic monomer. The adsorption equilibrium for vanillin, vanillic acid, and aceto...
First Insight into Lignin Valorization as a Promising Biopolymer for the Modula...
Pereira, AR; Brandao, E; Pinto, J; de Pinho, PG; Carina Costa; Rodrigues, AE; Michelin, M; Soares, S; de Freitas, V; Mateus, N; Oliveira, JLignosulfonate (LS), kraft lignin (KL), and organosolv lignin (OL) were evaluated as potential modulating agents of the physicochemical properties of Port wine at two different concentrations for 7 and 30 days. KL and LS demonstrated the ability to remove proteins and potentiate the anthocyanin concentration. LS reduced the tannin content and the interaction of salivary acidic proline-rich proteins with wine ph...
Sugarcane Light-Colored Lignin: A Renewable Resource for Sustainable Beauty
Mota, IF; Antunes, F; Fangueiro, JF; Carina Costa; Rodrigues, AE; Pintado, ME; Costa, PS<jats:p>Lignin has emerged as a promising eco-friendly multifunctional ingredient for cosmetic applications, due to its ability to protect against ultraviolet radiation and its antioxidant and antimicrobial properties. However, its typical dark color and low water solubility limit its application in cosmetics. This study presents a simple process for obtaining light-colored lignin (LCLig) from sugarcane bagasse...
Lignin Valorization for Added-Value Chemicals: Kraft Lignin versus Lignin Fract...
Carina Costa; Casimiro, FM; Vega-Aguilar, C; Rodrigues, AELignin is a raw material that can potentially be converted into valuable compounds through depolymerization reactions in addition to its use as a polymer or material. However, the chemical recalcitrance and the heterogeneous composition and structure of lignin make it challenging to establish processes that add value to this complex aromatic biopolymer. In this work, solvent fractionation was applied to obtain ...
Development of colloidal lignin particles through particle design strategies an...
Colucci, G; Santamaria Echart, A; Silva, SC; Teixeira, LG; Ribeiro, A; Rodrigues, AE; Barreiro, MFColloidal lignin particles (CLPs) have increased interest as green and sustainable materials for Pickering stabilizers, with particle design being an important step towards their effective use. In this context, the antisolvent precipitation method was selected to conduct a study aiming at understanding the effect of process variables (initial lignin concentration, antisolvent pH, final ethanol concentration, an...
Eucalyptus globulus bark as a source of polyphenolic compounds with biological ...
Da Mota, MIF; Pinto, PCOR; Novo, CC; Sousa, GDA; Da Neves Guerreiro, ORF; Da Conceicao Relvas Guerra, A; Duarte, MFP; Rodrigues, AEEucalyptus globulus bark, one of the main by-products of the pulp and paper industry in Southern Europe, is a potential source of valuable chemicals. In this work, chemical composition of E. globulus bark was studied with detail, including its carbohydrate composition. Response surface methodology (RSM) modeling and optimization was developed for the selective extraction of polyphenolic material from E. globulu...