Current state-of-the-art in ethanol production from lignocellulosic feedstocks

Robak, Katarzyna; Balcerek, Maria

doi:10.1016/j.micres.2020.126534

Cited by 115 publications

(63 citation statements)

References 103 publications

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“…Carbohydrate concentrations of the treated and untreated samples was determined by High Performance Liquid Chromatography (HPLC) according to Wallis, eta al [30]. For the untreated samples, the soluble lignin was quantified by the method proposed by [25], and the insoluble lignin analysis was performed according to Gomide & Demuner [31]. To quantify carbohydrates and lignin, low molecular weight organic substances, denominated extractives, were previously removed from the samples because these compounds may interfere with the analysis results.…”

Section: Analysis Of the Carbohydrate And Lignin Contents Of Biomassesmentioning

confidence: 99%

“…However, some released byproducts such as furfural and hydroxymethylfurfural, derived from sugars acid hydrolysis, can decrease fermentation performance. Other important fermentation inhibitors are formic acid, acetic acid, levulinic acid, and phenolic compounds [25]. Additional pretreatments are under study such as mild alkaline [26], oxidative [27], aqueous ammonia and steam explosion [28], as well as some combined techniques [24,29].…”

Section: Introductionmentioning

confidence: 99%

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Brachiaria brizantha Grass as a Feedstock for Ethanol Production

Rodrigues

Almeida

Maitan-Alfenas

et al. 2021

Braz. arch. biol. technol.

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Different lignocellulosic biomasses are found worldwide and each country has its own important industrial crop that can be converted into high-value products, such as ethanol. Therefore, evaluation of new biomasses to be used in biorefineries is important to decrease the dependence on non-renewable resources and to guarantee sustainable development. This work evaluated Brachiaria brizantha, a grass commonly used as animal forage, and the standard biomass for 2G-ethanol, sugarcane bagasse. The chemical compositions of both biomasses were determined and different times and temperature of acid pretreatment were tested. Morphological analysis via scanning electron microscopy showed more deconstructed fibers after harsher biomass pretreatments. Simultaneous saccharification and fermentation of pretreated Brachiaria brizantha presented higher efficiency than when using sugarcane bagasse as the carbon source. A biomass conversion of 46 % was achieved when Brachiaria brizantha grass was pretreated with 2% sulfuric acid for 60 minutes. Moreover, fermentation was not impaired by the inhibitors furfural and hydroxymethylfurfural. It was concluded that Brachiaria brizantha is a promising biomass for ethanol production.

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Section: Analysis Of the Carbohydrate And Lignin Contents Of Biomassesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Brachiaria brizantha Grass as a Feedstock for Ethanol Production

Rodrigues

Almeida

Maitan-Alfenas

et al. 2021

Braz. arch. biol. technol.

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“…Particularly, much research was focused on the biotechnological production of cellulosic ethanol from agriculture-derived lignocellulosic residues, like corncobs, sugar cane bagasse or various kinds of straw. This conversion of lignocellulosederived sugars into ethanol covers a range of individual processes: pretreatment of the material, enzymatic hydrolysis, fermentation and downstream processes [1]. The fermentation process is strongly influenced by inhibitory substances that are generated during the pretreatment of the lignocellulosic substrates [2].…”

Section: Introductionmentioning

confidence: 99%

Ethanol Production from Wheat Straw Hydrolysate by Issatchenkia Orientalis Isolated from Waste Cooking Oil

Zwirzitz

Alteio

Sulzenbacher

et al. 2021

JoF

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The interest in using non-conventional yeasts to produce value-added compounds from low cost substrates, such as lignocellulosic materials, has increased in recent years. Setting out to discover novel microbial strains that can be used in biorefineries, an Issatchenkia orientalis strain was isolated from waste cooking oil (WCO) and its capability to produce ethanol from wheat straw hydrolysate (WSHL) was analyzed. As with previously isolated I. orientalis strains, WCO-isolated I. orientalis KJ27-7 is thermotolerant. It grows well at elevated temperatures up to 42 °C. Furthermore, spot drop tests showed that it is tolerant to various chemical fermentation inhibitors that are derived from the pre-treatment of lignocellulosic materials. I. orientalis KJ27-7 is particularly tolerant to acetic acid (up to 75 mM) and tolerates 10 mM formic acid, 5 mM furfural and 10 mM hydroxymethylfurfural. Important for biotechnological cellulosic ethanol production, I. orientalis KJ27-7 grows well on plates containing up to 10% ethanol and media containing up to 90% WSHL. As observed in shake flask fermentations, the specific ethanol productivity correlates with WSHL concentrations. In 90% WSHL media, I. orientalis KJ27-7 produced 10.3 g L−1 ethanol within 24 h. This corresponds to a product yield of 0.50 g g−1 glucose (97% of the theoretical maximum) and a volumetric productivity of 0.43 g L−1 h−1. Therefore, I. orientalis KJ27-7 is an efficient producer of lignocellulosic ethanol from WSHL.

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“…Cellulose and hemicellulose can be isolated and transformed into a variety of chemicals or fuels through several methodologies [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Depolymerization and Hydrogenation of Organosolv Eucalyptus Lignin by Using Nickel Raney Catalyst

et al. 2021

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The use of lignocellulosic biomass to obtain biofuels and chemicals produces a large amount of lignin as a byproduct. Lignin valorization into chemicals needs efficient conversion processes to be developed. In this work, hydrocracking of organosolv lignin was performed by using nickel Raney catalyst. Organosolv lignin was obtained from the pretreatment of eucalyptus wood at 170 °C for 1 h by using 1/100/100 (w/v/v) ratio of biomass/oxalic acid solution (0.4% w/w)/1-butanol. The resulting organic phase of lignin in 1-butanol was used in hydrogenation tests. The conversion of lignin was carried out with a batch reactor equipped with a 0.3 L vessel with adjustable internal stirrer and heat control. The reactor was pressurized at 5 bar with hydrogen at room temperature, and then the temperature was raised to 250 °C and kept for 30 min. Operative conditions were optimized to achieve high conversion in monomers and to minimize the loss of solvent. At the best performance conditions, about 10 wt % of the lignin was solubilized into monomeric phenols. The need to find a trade-off between lignin conversion and solvent side reaction was highlighted.

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Current state-of-the-art in ethanol production from lignocellulosic feedstocks

Cited by 115 publications

References 103 publications

Brachiaria brizantha Grass as a Feedstock for Ethanol Production

Brachiaria brizantha Grass as a Feedstock for Ethanol Production

Ethanol Production from Wheat Straw Hydrolysate by Issatchenkia Orientalis Isolated from Waste Cooking Oil

Depolymerization and Hydrogenation of Organosolv Eucalyptus Lignin by Using Nickel Raney Catalyst

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