Short alkyl-imidazolium ionic liquids enhanced in-situ transesterification of microalgae

Ma, Zhiwen; Lu, Tao; Pan, Yali; Yuan, Yupeng; Sun, Yingqiang

doi:10.1016/j.fuel.2023.129828

Cited by 3 publications

(2 citation statements)

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“…Dissolution of algal biomass in ionic liquids has been described previously for various algae species [13][14][15][16], including those belonging to brown algae, such as Sargassum fulbellum, Laminaria japonica, Undaria pinnatifida, Saccharina japonica. Dialkylimidazolium-and alkylpyridinium-based room temperature ILs (chlorides, tetrafluoroborates, and acetates) were used at temperatures of 100-150 • C and at a treatment duration of up to 6 h. However, the main objective of these studies was the isolation of polysaccharides for subsequent hydrolysis with further biofuel production, as well as lipid extraction with organic solvents without focusing on the obtaining and characterizing polyphenolic fractions.…”

Section: Introductionmentioning

confidence: 87%

“…The NMR spectra were recorded on an AVANCE III NMR spectrometer (Bruker, Ettlingen, Germany) with a working frequency for protons of 600 MHz. The 1 H- 13 C HSQC (Heteronuclear Single Quantum Correlation) spectra were recorded using the following parameters: temperature-298 K, spectral window width ~13 ppm for F2 and ~200 ppm for F1 with a number of accumulations-1024 × 256, number of scans-8, delay time between pulses (D1)-2.0 s. To register the 1 H- 13 C HSQC spectra, about 40 mg of sample was dissolved in 0.5 mL of DMSO-d 6 .…”

Section: Ftir and Nmr Spectroscopymentioning

confidence: 99%

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Fractionation of Arctic Brown Algae (Fucus vesiculosus) Biomass Using 1-Butyl-3-methylimidazolium-Based Ionic Liquids

Belesov,

Lvova,

Falev

et al. 2023

Molecules

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Arctic brown algae are considered a promising industrial-scale source of bioactive sub-stances as polysaccharides, polyphenols, and low-molecular secondary metabolites. Conventional technologies for their processing are focused mainly on the isolation of polysaccharides and involve the use of hazardous solvents. In the present study a “green” approach to the fractionation of brown algae biomass based on the dissolution in ionic liquids (ILs) with 1-butil-3-methylimidazolium (bmim) cation with further sequential precipitation of polysaccharides and polyphenols with acetone and water, respectively, is proposed. The effects of IL cation nature, temperature, and treatment duration on the dissolution of bladderwrack (Fucus vesiculosus), yields of the fractions, and their chemical composition were studied involving FTIR and NMR spectroscopy, as well as size-exclusion chromatography and monosaccharide analysis. It was shown that the use of bmim acetate ensures almost complete dissolution of plant material after 24 h treatment at 150 °C and separate isolation of the polysaccharide mixture (alginates, cellulose, and fucoidan) and polyphenols (phlorotannins) with the yields of ~40 and ~10%, respectively. The near-quantitative extraction of polyphenolic fraction with the weight-average molecular mass of 10–20 kDa can be achieved even under mild conditions (80–100 °C). Efficient isolation of polysaccharides requires harsh conditions. Higher temperatures contribute to an increase in fucoidan content in the polysaccharide fraction.

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Section: Introductionmentioning

confidence: 87%

Section: Ftir and Nmr Spectroscopymentioning

confidence: 99%