Green extractions to obtain value-added elephant grass co-products in an ethanol biorefinery

Scopel, Eupídio; Santos, Luana C. dos; Bofinger, Matheus Rodrigues; Martínez, Julián; Rezende, Camila A.

doi:10.1016/j.jclepro.2020.122769

Cited by 13 publications

(16 citation statements)

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“…1, extractives were recovered by PLE using a mixture of water and ethanol (50% v/v) at 100°C (three cycles of 15 min each). 22 Then, a diluted acid treatment (H 2 SO 4 2% v/v at 121°C for 40 min) was applied to the postextraction solid. 1 After the treatment, the liquid fraction was separated by filtration, characterized and used to produce furfural.…”

Section: Biomass Fractionationmentioning

confidence: 99%

“…Pressurized liquid extraction with water and ethanol was chosen for extractive recovery here owing to the higher yield compared with PLE with ethyl acetate and supercritical carbon dioxide extraction. 22 Sequentially, the acid treatment allowed the hydrolytic extraction of hemicellulose to the liquid fraction, mainly as monomeric sugars, which could be converted into furfural.…”

Section: Fractionation Overviewmentioning

confidence: 99%

“…Detailed characterization and discussion of the extractive composition obtained by this method were previously reported. 22 The molecules composing elephant grass extractives are generally suitable for applications in food, pharmaceutical and cosmetic industries as emulsifiers, antioxidants and food additives.…”

Section: Extractive and Hemicellulose Recovery To Achieve The Whole B...mentioning

confidence: 99%

“…Similarly to the production of nanoparticles in integrated biorefineries, only a few works report the recovery of extractives from lignocellulosic biomasses in co-production processes, [20][21][22] despite their abundance in grasses (up to 20 wt%) and their rich chemical composition comprising a diverse range of high-value-added organic molecules, including sterols, phenolics and fatty acids. 22,23 Finally, hemicellulose sugars can be suitably analyzed, recovered or forwarded to produce derivates like furfural, a valuable chemical platform for producing polymers and other organic molecules. 24 Here, we propose a comprehensive biorefinery prototype for coupling the co-production of nanomaterials (CNCs, CNFs and LNPs) and chemicals (xylose, furfural and extractives) from elephant grass leaves using only water-based processes.…”

mentioning

confidence: 99%

“…Elephant grass is a suitable raw material because of its high adaptability and productivity, 25,26 besides its large quantity of extractives (from 7 to 20 wt %). 22 For cellulose use, we compared the production of CNFs and CNCs with the classical approach to produce glucose by enzymatic hydrolysis. The aqueous chemical procedures used here for biomass fractionation (pressurized liquid extraction, acid, and alkaline treatments) did not hinder the subsequent conversion of the isolated components into the target end-products.…”

mentioning

confidence: 99%

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Broadening the product portfolio with cellulose and lignin nanoparticles in an elephant grass biorefinery

Scopel

Camargos

Pinto

et al. 2023

Biofuels Bioprod Bioref

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Cellulose and lignin nanoparticles are high-value-added products obtained from lignocellulosic biomasses through several steps of cellulose purification and lignin extraction. These steps drastically reduce the potential feedstock revenue when carried out as stand-alone methodologies. To increase biomass yields, we describe here a strategy to design a biorefinery focused on producing cellulose and lignin nanoparticles as main products, but also aim to recover and benefit from other biomass components using only water-based processes. Sequential pressurized liquid extractions and diluted acid and alkaline treatments were carried out to fractionate elephant grass biomass, yielding (for every 100 g of biomass): 30 g of cellulose pulp (converted to 9 g of cellulose nanocrystals and 9 g of cellulose nanofibers); 10 g of lignin (used to produce 8.5 g of stable colloidal lignin nanoparticles by probe-sonication in water); 7.5 g of extractives (e.g. sterols and phenolics) and 23 g of xylose (converted to 4.1 g of furfural). Alternatively, to allow for the flexible use of the cellulose fraction in the proposed biorefinery, 22 g of glucose could be produced by enzymatic hydrolysis. The results demonstrate that water-based processes are suitable for a holistic use of biomass, providing a comprehensive set of high-value-added co-products that are renewable and cost-effective chemical, cosmetic, food, polymer and pharmaceutical solutions.

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Section: Biomass Fractionationmentioning

confidence: 99%

Section: Fractionation Overviewmentioning

confidence: 99%

Section: Extractive and Hemicellulose Recovery To Achieve The Whole B...mentioning

confidence: 99%