Abstract
Abstract An organosolv process using ethanol-water was optimized in order to recover high quality lignin from rice-straw previously pre-treated by autohydrolysis at 210 °C. The results showed a selective and appreciable removal of lignin under very mild conditions and the highest delignification yield occurred at 30 °C. The lignin extracts were characterised using capillary zone electrophoresis (CZE), size exclusion chromatography (SEC), Fourier transform infrared spectroscopy (FT-IR) and 31P-NMR, and two-dimensional heteronuclear single quantum correlation NMR spectroscopy (2D-HSQC NMR), which enabled the identification of low molecular weight lignins with a syringyl/guaiacyl ratio of about 0.74 containing phenolic compounds with potential bioactive properties. In order to separate the target compounds, membrane technology has been used and an enriched extract containing value-added phenolic compounds such as tricin, vanillin, ferulic acid and p-coumaric acid was obtained. High membrane efficiency (around 80%) was obtained for target compounds.
Highlights
Agricultural residues are considered interesting biomass feedstock for biorefineries due to their low cost and availability [1,2]
An organosolv process using ethanol-water was optimized in order to recover high quality lignin from rice-straw previously pre-treated by autohydrolysis at 210 °C
The results showed a selective and appreciable removal of lignin under very mild conditions and the highest delignification yield occurred at 30 °C
Summary
Agricultural residues are considered interesting biomass feedstock for biorefineries due to their low cost and availability [1,2]. Membrane separation and characterisation of lignin and its derived products T Obtained by a mild ethanol organosolv treatment of rice straw
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