Microwave assisted hydrothermal as greener pretreatment of brewer’s spent grains for biobutanol production

López-Linares, Juan Carlos; Cubero, Marı́a Teresa Garcı́a; Lucas, Susana; Benito, Gerardo González; Coca, Mónica

doi:10.1016/j.cej.2019.03.032

Cited by 101 publications

(30 citation statements)

References 47 publications

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“…Moreover, it highlights an important content of arabinan (6.4%), with an arabinose‐to‐xylose ratio of 0.39. This ratio is similar to those calculated for the same raw material in previous works 27,35 …”

Section: Resultssupporting

confidence: 90%

“…This behaviour was also observed in the glucose and hemicellulosic sugar recoveries in the liquid extracts (GR L and HSR L , respectively; Table 2), which were very low for all experimental runs carried out (GR L < 9.8% and HSR L < 1.8%), the highest recoveries also being achieved when high temperatures and amounts of water in the DES were used (runs 2 and 18). The pH of the resulting liquid extracts ranged from 3.72 to 4.74, which are similar values to those typically obtained in hydrothermal processes 27 . Furthermore, no degradation products (formic acid, acetic acid, HMF and furfural) were detected (Table 2), which has also been previously reported by other authors as a great property of the ChCl:Glyc solvent 46,47 …”

Section: Resultssupporting

confidence: 85%

“…A Multiwave PRO SOLV reactor (50 Hz) with rotor‐type 16HF100 (Anton Paar GmbH, Austria, Europe) was used to extract phenolic compounds from BSG, as described elsewhere 27 . The maximum microwave power was 1800 W, generated by two standard magnetrons of 1000 W. Sixteen sample vessels of 100 mL capacity could be used; these were ceramic and PTFE‐TFM vessels that can withstand high pressure.…”

Section: Methodsmentioning

confidence: 99%

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Microwave‐assisted deep eutectic solvent extraction of phenolic compounds from brewer's spent grain

López-Linares

Campillo

Coca

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUNDDeep eutectic solvents (DESs) have been tested as promising green solvents for the microwave‐assisted extraction of phenolic compounds from brewer's spent grain (BSG). Firstly, a preliminary screening with four different DESs was carried out in order to determine the most effective DES for recovering phenolic compounds (measured as total phenols) from BSG. Later, an experimental design using the DES found to be most effective in the preliminary screening was applied to optimize microwave‐assisted choline chloride (ChCl):glycerol extraction.RESULTSChCl:glycerol was the most effective DES tested in the preliminary screening to recover phenolic compounds (2.3 mg GA g−1 BSG), even more than methanol (80% v/v) as conventional solvent (1.2 mg GA g−1 BSG). On the other hand, using ChCl:glycerol as DES, a total phenols content of 2.89 mg GA g−1 BSG was obtained operating at 100 °C for 13.30 min and 37.46% (v/v) water in the DES, ferulic and coumaric acids being the most abundant. Moreover, a residual extracted solid with non‐disturbed structural carbohydrates was achieved, which could be successfully used in a biorefinery to obtain other products, such as biofuels or chemicals.CONCLUSIONSThe suitability of a novel and green extraction process based on DESs combined with microwave assistance for the recovery of phenolic compounds from BSG was demonstrated. © 2020 Society of Chemical Industry (SCI)

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 85%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Microwave‐assisted deep eutectic solvent extraction of phenolic compounds from brewer's spent grain

López-Linares

Campillo

Coca

et al. 2020

J of Chemical Tech & Biotech

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“…On the contrary, acetic acid is only reduced on a very low level (only 4%), as activated charcoal detoxification is able to effectively reduce inhibitors, such as HMF, furfural, formic acid, and phenols, but there is not much evidence that this method is effective for acetic acid reduction [22]. Substantial furan and phenolic compound reductions by activated charcoal detoxification were also achieved from hydrolysates of the brewery's spent grain [23], sweet sorghum bagasse [24], olive tree pruning biomass [25], and corn pericarp [26].…”

Section: Eop Hydrolysate Composition and Detoxificationmentioning

confidence: 99%

Xylitol Production from Exhausted Olive Pomace by Candida boidinii

et al. 2020

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In this work, the production of xylitol from a hemicellulosic hydrolysate of exhausted olive pomace (EOP), a residue originated in the olive oil production process by Candida boidinii, was assessed. The hydrolysate was obtained by dilute acid pretreatment of EOP at 170 °C and 2% H2SO4 (w/v). A previous detoxification step of the hydrolysate was necessary, and its treatment with activated charcoal and ion-exchange resin was evaluated. Prior to fermentation of the hydrolysate, fermentation tests in synthetic media were performed to determine the maximum xylitol yield and productivity that could be obtained if inhibitory compounds were not present in the medium. In addition, the glucose existing in the media exerted a negative influence on xylitol production. A maximum xylitol yield of 0.52 g/g could be achieved in absence of inhibitor compounds. Fermentation of the hemicellulosic hydrolysate from EOP after detoxification with ion-exchange resin resulted in a xylitol yield of 0.43 g/g.

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“…(England) was the first to implement this process on an industrial scale for processing feed grains in order to increase its nutritional value. Heat treatment of compound feed and raw materials for its production allows solving important problems in compound feed production: to increase the nutritional value and digestibility of compound feed due to the breakdown of indigestible substances; to improve organoleptic quality indicators; ensure microbiological safety due to disinfection; reduce the strength characteristics of lumpy grain, which will reduce energy consumption for its grinding and further processing into compound feed products [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the micronization process effect on the amino acid composition in compound feed

et al. 2020

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The article presents the results of a study of the effect of feed samples micronization on proteinogenic amino acids, such as: arginine, lysine, tyrosine, phenylalanine, histidine, leucine-isoleucine, methionine, valine, proline, tyrosine, serine, alanine. The optimal parameters of the micronization process of compound feed have been substantiated in order to increase the digestibility of feed and disinfection.

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Microwave assisted hydrothermal as greener pretreatment of brewer’s spent grains for biobutanol production

Cited by 101 publications

References 47 publications

Microwave‐assisted deep eutectic solvent extraction of phenolic compounds from brewer's spent grain

Microwave‐assisted deep eutectic solvent extraction of phenolic compounds from brewer's spent grain

Xylitol Production from Exhausted Olive Pomace by Candida boidinii

Analysis of the micronization process effect on the amino acid composition in compound feed

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