7 documents found, page 1 of 1
Tunning antisolvent precipitation for the synthesis of lignin nanoparticles usi...
Mesquita, Ricardo Marchezan Farias de; Schneider, Willian Daniel Hahn; Longo, Vinicius; Baudel, Henrique Macedo; Diebold, Eduardo; Rencoret, JorgeLignin nanoparticles (LNPs) show great potential in UV-protectants, drugs carriers, encapsulation, supercapacitors, and others. This study proposes the development of an optimised LNP synthesis method by antisolvent precipitation, using lignin from persimmon tree pruning waste, green coconut waste, and sugarcane bagasse. The best synthesis conditions were determined evaluating the chemical composition and the p...
Transforming second-generation ethanol production waste into sustainable enzyma...
Polesso, Camila Borges; Fontana, Roselei Claudete; Costa, Cristiana C.; Fernandes, Bruno; Matamá, Maria Teresa Gonçalves Macedo; Cavaco-Paulo, ArturAgro-industrial residues were used as a successful, cheap and renewable substrate, capable of increasing activity of ligninolytic enzymes for further use in melanin degradation assays to develop inputs for the treatment of skin hyperpigmentation. The analysis of melanin degradation was performed in a quantitative and qualitative way. The enzymatic crude broth extract, rich in laccases, produced by Marasmiellus ...
Lignin from tree barks: chemical structure and valorization
Neiva, Duarte M.; Rencoret, Jorge; Marques, Gisela; Gutiérrez, Ana; Gominho, Jorge; Pereira, Helena; Rio, José C. delLignins from different tree barks, including Norway spruce (Picea abies), eucalyptus (Eucalyptus globulus), mimosa (Acacia dealbata) and blackwood acacia (A. melanoxylon), are thoroughly characterized. The lignin from E. globulus bark is found to be enriched in syringyl (S) units, with lower amounts of guaiacyl (G) and p-hydroxyphenyl (H) units (H/G/S ratio of 1:26:73), which produces a lignin that is highly en...
Hydroxystilbene glucosides are incorporated into Norway spruce bark lignin
Rencoret, Jorge; Neiva, Duarte M.; Marques, Gisela; Gutiérrez, Ana; Kim, Hoon; Gominho, Jorge; Pereira, H.; Ralph, John; Rio, José C. delRecent investigations have revealed that, in addition to monolignols, some phenolic compounds derived from the flavonoid and hydroxystilbene biosynthetic pathways can also function as true lignin monomers in some plants. In this study, we found that the hydroxystilbene glucosides isorhapontin (isorhapontigenin-O-glucoside) and, at lower levels, astringin (piceatannol- O-glucoside) and piceid (resveratrol-O-gluc...
Morphological characteristics and composition of lipophilic extractives and lig...
Prinsen, Pepijn; Gutiérrez, Ana; Rencoret, Jorge; Nieto, Lidia; Jiménez-Barbero, Jesús; Burnet, Auphélia; Petit-Conil, Michel; Colodette, Jorge L.The morphological and chemical characteristics of the woods from several eucalypt hybrids from the Brazilian Genolyptus program were studied. The hybrids selected for this study were Eucalyptus grandis × E. urophylla (IP), E. urophylla × E. urophylla (U1 × U2), E. grandis × [E. urophylla × E. globulus] (G1 × UGL), and [E. dunnii × E. grandis] × E. urophylla (DG × U2). The analyses of the lipophilic extractives ...
Analysis of a modern hybrid and an ancient sugarcane implicates a complex inter...
Poelking, Viviane Guzzo de Carli; Giordano, Andrea; Ricci-Silva, Maria Esther; Williams, Thomas Christopher Rhys; Peçanha, Diego AlvesAbundant evidence exists to support a role for lignin as an important element in biomass recalcitrance. However, several independent studies have also shown that factors apart from lignin are also relevant and overall, the relative importance of different recalcitrance traits remains in dispute. In this study we used two genetically distant sugarcane genotypes, and performed a correlational study with the varia...
Lignin composition and structure differs between xylem, phloem and phellem in Q...
Lourenço, Ana; Rencoret, Jorge; Chemetova, Catarina; Gominho, Jorge; Gutierrez, Ana; Rio, José C. del; Pereira, HelenaThe composition and structure of lignin in different tissues—phellem (cork), phloem and xylem (wood)—of Quercus suber was studied. Whole cell walls and their respective isolated milled lignins were analyzed by pyrolysis coupled with gas chromatography/mass spectrometry (Py-GC/MS), two-dimensional nuclear magnetic resonance spectroscopy (2D-NMR) and derivatization followed by reductive cleavage (DFRC). Different...