Publications by authors named "Tainise Lourencon"
Article Synopsis
- Lignin has gained attention for its antibacterial and antioxidant properties, but its varied composition poses challenges for use, particularly in food applications.
- The study assesses lignin from two sources, using different spectroscopic techniques to characterize them and tests to measure their antimicrobial and antioxidant effectiveness.
- Results show that kraft lignin outperforms alkali lignin in these activities and demonstrates potential as a natural additive to enhance food quality and safety against bacteria like Staphylococcus aureus and Salmonella Enteritidis.
Acetylated Kraft lignins were evaluated for their ability of structuring vegetable oils into oleogels. Microwave-assisted acetylation was used to adjust lignin's degree of substitution according to reaction temperature (130 to 160 °C), and its effect in improving the viscoelasticity of the oleogels, which was related to the hydroxyl group content. The results were compared with those obtained by Kraft lignins acetylated using conventional methods at room temperature.
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- The study applied HCl gas treatments to Scots pine wood to control its macrostructure while analyzing the impact on its microstructure, resulting in a preserved cellular structure.
- Wood's initial moisture content (iMC) significantly influenced the hydrolysis process, with higher iMCs leading to more hemicellulose degradation, while crystalline cellulose microfibrils remained mostly unchanged.
- Interestingly, higher iMCs increased the concentration of accessible OH groups, but the HCl treatment also reduced the amount of absorbed DO molecules, independent of the changes in OH concentration.
The global "carbon emission peak" and "carbon neutrality" strategic goals promote us to replace current petroleum-based resin products with biomass-based resins. The use of technical lignins and hemicellulose-derived furfuryl alcohol in the production of biomass-based resins are among the most promising ways. Deep understanding of the resulting resin structure is a prerequisite for the optimization of biomass-based resins.
View Article and Find Full Text PDFKraft lignin, so far useful for energy generation, has been gathering considerable attention as an alternative material to replace fossil-based resources mainly due to its high phenolic content. However, the wide molecular weight distribution and chemical composition heterogeneity led to the development of fractionation methods. Herein, to narrow such characteristics we used eucalypt kraft lignin fractionated at pH's 9, 7, 5 and 3 by sequential acid precipitation.
View Article and Find Full Text PDFCellulose-lignin composite fibres were spun from ionic liquid (IL) solutions by dry-jet wet spinning. Birch pre-hydrolysed Kraft (PHK) pulp and organosolv beech (BL) or spruce lignin (SL) were dissolved in the IL 1,5-diazabicyclo[4.3.
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