Hot-water extraction of<i>Miscanthus × giganteus</i>prior to soda-AQ pulping: a biorefining perspective

Ullah, Saleem; Pakkanen, Hannu; Lehto, Joni; Alén, Raimo

doi:10.1080/17597269.2018.1442664

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…Hot-water extraction, which is catalyzed by hydronium ions generated by acetic acid produced from the cleavage of acetyl groups, has been considered as an effective process to extract hemicelluloses. − Hot-water extraction affords excellent techno-economic advantages, as no chemicals other than water is added in the whole process. − It was earlier found that 80–90% galactoglucomannans (GGMs) could be extracted from spruce wood by pressurized hot-water extraction at temperatures up to 170 °C for 60 min, but other compounds, including parts of lignin and lignin–carbohydrate complexes (LCCs), were also liberated into the hot-water extraction liquors. , It was reported that LCCs limit the separation of lignin and carbohydrates in hot-water extraction liquors and also hinder enzymatic hydrolysis of hemicellulosic sugars for biofuel production. , However, lignin and LCCs generated during the hydrolysis process can be considered as high added-value compounds, showing potential applications in medicine and cosmetic formulations on the basis of diverse unique pharmacological activities and novel natural antioxidants. − …”

Section: Introductionmentioning

confidence: 99%

Valorization of Lignin–Carbohydrate Complexes from Hydrolysates of Norway Spruce: Efficient Separation, Structural Characterization, and Antioxidant Activity

Wang

Cheng

et al. 2018

ACS Sustainable Chem. Eng.

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Hot-water extraction has shown great potential in a green biorefinery; however, efficient separation of lignin and carbohydrates is still a big challenge, especially to lignin–carbohydrate complexes (LCCs). The aim of the present study was to develop a facile approach for efficiently fractionating LCCs from hot-water extraction liquor of spruce wood to understand their comprehensive structure and thus to achieve the valorization of fractions. Approximately 93% of the hemicelluloses were first recovered by a selective adsorptive resin from hot-water hydrolysates. The lignin-rich fractions obtained from desorption of the adsorbed compounds were further subjected to a gradient dialysis procedure toward functional fractionation. Linear relationship between lignin and uronic acids as well as xylose contents in graded fractions of all hydrolysates was observed. Further characterization of LCCs by two-dimensional nuclear magnetic resonance and pyrolysis-gas chromatography-mass spectrometry showed the large difference of their structures in each graded fraction and suggested ester bonds as the main types of chemical linkages between lignin and carbohydrate. Furthermore, the antioxidant properties of those LCCs as well as hemicellulose fractions will facilitate their applications to a broader spectrum such as cosmetics, pharmaceuticals, and functional packaging.

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Section: Introductionmentioning

confidence: 99%

Valorization of Lignin–Carbohydrate Complexes from Hydrolysates of Norway Spruce: Efficient Separation, Structural Characterization, and Antioxidant Activity

Wang

Cheng

et al. 2018

ACS Sustainable Chem. Eng.

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“…To achieve an integrated biorefinery process, a green and efficient fractionation approach is essential for breaking the recalcitrance of biomass. Autohydrolysis, in which raw material is pretreated with pure water, may be applied to selectively remove hemicelluloses prior to pulping processes (Koo et al 2019;Korotkova et al 2015;Santos et al 2018;Ullah et al 2018). Most of hemicelluloses could be extracted in the form of oligomers from lignocellulosic biomass through the hot-water extraction at a high temperature range (160-240 °C) (Alvira et al 2010;Ballesteros et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Facile fractionation of bamboo hydrolysate and characterization of isolated lignin and lignin-carbohydrate complexes

Wang

et al. 2020

Holzforschung

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An efficient separation technology for hydrolysates towards a full valorization of bamboo is still a tough challenge, especially regarding the lignin and lignin-carbohydrate complexes (LCCs). The present study aimed to develop a facile approach using organic solvent extraction for efficiently fractionating the main components of bamboo hydrolysates. The high-purity lignin with only a trace of carbohydrates was first obtained by precipitation of the bamboo hydrolysate. The water-soluble lignin (WSL) fraction was extracted in organic solvent through a three-stage organic solvent extraction process, and the hemicellulosic sugars with increased purity were also collected. Furthermore, a thorough characterization including various NMR techniques (31P, 13C, and 2D-HSQC), GPC, and GC-MS was conducted to the obtained lignin-rich-fractions. It was found that the WSL fraction contained abundant functional groups and tremendous amount of LCC structures. As compared to native LCC of bamboo, the WSL fraction exhibited more typical LCC linkages, i.e. phenyl glycoside linkage, which is the main type of chemical linkage between lignin and carbohydrate in both LCC samples. The results demonstrate that organic phase extraction is a highly efficient protocol for the fractionation of hydrolysate and the isolation of LCC-rich streams possessing great potential applications.

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Fast pyrolysis of hot-water-extracted and soda-AQ-delignified okra (Abelmoschus esculentus) and miscanthus (miscanthus x giganteus) stalks by Py-GC/MS

Ghalibaf

Ullah

Alén

2018

Biomass and Bioenergy

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Hot-water extraction ofMiscanthus × giganteusprior to soda-AQ pulping: a biorefining perspective

Cited by 3 publications

References 26 publications

Valorization of Lignin–Carbohydrate Complexes from Hydrolysates of Norway Spruce: Efficient Separation, Structural Characterization, and Antioxidant Activity

Valorization of Lignin–Carbohydrate Complexes from Hydrolysates of Norway Spruce: Efficient Separation, Structural Characterization, and Antioxidant Activity

Facile fractionation of bamboo hydrolysate and characterization of isolated lignin and lignin-carbohydrate complexes

Fast pyrolysis of hot-water-extracted and soda-AQ-delignified okra (Abelmoschus esculentus) and miscanthus (miscanthus x giganteus) stalks by Py-GC/MS

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