8 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 ...
New Insights into pH-dependent Complex Formation between Lignosulfonates and An...
Pereira, AR; Bravo, C; Ramos, RM; Carina Costa; Rodrigues, A; de Freitas, V; Mateus, N; Dias, R; Soares, S; Joana OliveiraAnthocyanins have limited application as natural colorants and antioxidants due to their color loss and instability under certain conditions. This research explores the formation of a complex between lignosulfonates (LS) and cyanidin-3-O-glucoside (C3G) using a multitechnique approach as well as the effect on C3G ' s red color, oxidative stability, and antioxidant activity in acidic mediums. All data revealed p...
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...
Exploring the Potential of Vine Shoots as a Source of Valuable Extracts and Sta...
Pereira, AR; Carina Costa; Nuno Mateus; Victor de Freitas; Rodrigues, A; Joana OliveiraLarge amounts of vine shoots are generated every year during vine pruning. This residue still presents many of the compounds found in the original plant, including low molecular weight phenolic compounds and structural compounds such as cellulose, hemicellulose, and lignin. For wine-producing regions, the challenge is to develop alternatives that will increase the value of this residue. This work proposes the f...
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 ...
Characterization of ulvan extracts to assess the effect of different steps in t...
Carina Costa; Anabela Alves; Paula C R. Pinto; Rui A. Sousa; Eduardo A. Borges da Silva; Rui L. Reis; Alírio E. RodriguesAn effective application development of the polysaccharide ulvan requires a comprehensive knowledge about the influence of the extraction process on composition of the extracts and in ulvan itself. In this context, the two main objectives of the present work are (1) the establishment of an efficient extraction process for ulvan and (2) development of an accurate characterization methodology to evaluate the extr...