Production of cellulosic ethanol from sugarcane bagasse by steam explosion: Effect of extractives content, acid catalysis and different fermentation technologies

Neves, Priscila Vinholi; Pitarelo, Ana Paula; Ramos, Luiz Pereira

doi:10.1016/j.biortech.2016.02.085

Cited by 118 publications

(58 citation statements)

References 28 publications

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“…The major components of bagasse extracts from HTL are carbohydrates and their derivatives in soluble forms such as sugars or organic acids. Previous studies have shown that HTL treatment of bagasse at 160 °C produces hemicellulosic sugars such as xylose or xylooligosaccharides from xylan which have low molecular weight as compared to cellulose (Yu et al , ; Neves et al , ). The composition of the bagasse extracts mainly composed of carbohydrates at 510.3 mg g −1 with detected saccharides in decreasing order are xylotriose>cellobiose> xylobiose (Table ).…”

Section: Resultsmentioning

confidence: 99%

Potential of bagasse obtained using hydrothermal liquefaction pre‐treatment as a natural emulsifier

Vodo

Taarji

Bouhoute

et al. 2020

Int J of Food Sci Tech

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Summary Bagasse, a by‐product from raw sugar factories, is conventionally burned for energy production. In this study, bagasse extracts from hydrothermal liquefaction (HTL) treatment (160 °C, 1 MPa and 30 min) with a carbohydrate content of 510.3 mg g−1 and 0.5 mg g−1 of total phenols were applied as emulsifiers in oil‐in‐water (O/W) emulsions. Bagasse extracts from HTL (0.5–4 wt%) lowered the interfacial tension between oil–water interphase from 19.8 to 14.0 mN m−1, owing possibly to the surface‐active hydrophilic carbohydrate‐hydrophobic lignin complexes in the extracts (lignin content: 7.1% w/w). Emulsions stabilised by bagasse extracts from HTL with average droplet size, dav of 0.79 μm were comparable with gum arabic (GA), dav of 2.24 μm after 11 days at 25 °C. Bagasse extracts containing biopolymers have the potential for industrial applications involving emulsion systems; therefore, HTL treatment of bagasse without any solvents can be regarded as an effective tool for producing natural emulsifiers.

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Section: Resultsmentioning

confidence: 99%

Potential of bagasse obtained using hydrothermal liquefaction pre‐treatment as a natural emulsifier

Vodo

Taarji

Bouhoute

et al. 2020

Int J of Food Sci Tech

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“…Since pSSF usually gives better ethanol productivities than SSF [23,33], this unexpected result was probably due to the presence of inhibitors in the fermentation media. By contrast, Neves et al [24] , respectively. However, these results were obtained in the absence of fermentation inhibitors using low enzyme loadings of Cellic CTec2 and the S. cerevisiae strain Thermossac Dry for fermentation.…”

Section: Fermentationmentioning

confidence: 93%

“…However, SSF does not allow yeast recycling and hydrolysis is usually carried out below its optimal temperature. In both configurations mentioned above, ethanol yields can be increased if the fermenting organism is able to convert pentoses and hexoses simultaneously [23,24].…”

Section: Introductionmentioning

confidence: 99%

Production of cellulosic ethanol from steam-exploded Eucalyptus urograndis and sugarcane bagasse at high total solids and low enzyme loadings

Chiarello

Ramos

Neves

et al. 2016

Sustain Chem Process

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Cellulosic ethanol is one of the most important biotechnological products to mitigate the consumption of fossil fuels and to increase the use of renewable resources for fuels and chemicals. By performing this process at high total solids (TS) and low enzyme loadings (EL), one can achieve significant improvements in the overall cellulosic ethanol production process. In this work, steam-exploded materials were obtained from Eucalyptus urograndis chips and sugarcane bagasse to be subsequently used for enzymatic hydrolysis at high TS (20 wt%) and relatively low EL (13.3 FPU g −1 TS of Cellic CTec3 from Novozymes). Also, the fermentability of their corresponding hydrolysates was tested using an industrial strain of Saccharomyces cerevisiae (Thermosacc Dry from Lallemand). Enzymatic hydrolysis of steam-treated E. urograndis reached 125 g L −1 of glucose in 72 h, while steam-treated bagasse gave yields 25 % lower. Both substrate hydrolysates were easily converted to ethanol, giving yields above 25 g L −1 and productivities of 2.3 g L −1 h −1 for eucalypt and 2.2 g L −1 h −1 for bagasse after only 12 h of fermentation. Under the conditions used in this study, sugarcane bagasse glucans showed the potential to boost the ethanol production from sugarcane culms by 31 %, from the 80 L t −1 of first generation to a total production of 105 L t −1. On the other hand, E. urograndis plantations are able to achieve cellulosic ethanol productivities of 2832.2 L ha −1 year −1 , which was 57.8 % higher than the projected value of 1794.5 L ha −1 year −1 that was obtained for sugarcane bagasse.

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“…Bioethanol, produced from lignocellulosic biomass, is a possible alternative to fossil fuels used in transportation (Saini et al 2015). Bioethanol can be produced from several agro-industrial residues, municipal solid waste, sawdust, and dedicated energy crops, such as miscanthus, switchgrass, black poplar (Populus nigra L.), and giant reed (Arundo donax L.) (Liguori et al 2016;Neves et al 2016;Ventorino et al 2016a). Lignocellulosic ethanol offers several advantages compared to firstgeneration bioethanol, which is generated from the fermentation of sugar and starch.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cellulase, Substrate Concentrations, and Configuration Processes on Cellulosic Ethanol Production from Pretreated Arundo donax

Aliberti¹,

Ventorino²,

Robertiello³

et al. 2017

BioResources

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Arundo donax was used to investigate the effect of the enzyme and substrate concentrations on hydrolysis, pre-hydrolysis and simultaneous saccharification and fermentation (PSSF), in comparison to simultaneous saccharification and fermentation (SSF). Hydrolysis was performed at 37 and 50 °C. At the highest biomass (10%) and enzyme (69.6 FPU/g cellulose) loadings, the highest glucose concentration (32.4 g/L) was obtained (at 50 °C). SSF resulted in a cellulose conversion (91.9%) and an ethanol concentration (19.8 g/L) higher than what was obtained using PSSF at 37 °C (86.9% and 18.8 g/L, respectively) and PSSF at 50 °C (81.6% and 17.7 g/L, respectively). A positive correlation between the cellulase concentration, cellulose conversion, and ethanol content was observed. In PSSF, the increase in the solids loadings caused a reduction in the % cellulose conversion, but the ethanol concentration in PSSF and SSF increased. SSF appeared to be the most advantageous process for bioethanol production from A. donax.

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Production of cellulosic ethanol from sugarcane bagasse by steam explosion: Effect of extractives content, acid catalysis and different fermentation technologies

Cited by 118 publications

References 28 publications

Potential of bagasse obtained using hydrothermal liquefaction pre‐treatment as a natural emulsifier

Potential of bagasse obtained using hydrothermal liquefaction pre‐treatment as a natural emulsifier

Production of cellulosic ethanol from steam-exploded Eucalyptus urograndis and sugarcane bagasse at high total solids and low enzyme loadings

Effect of Cellulase, Substrate Concentrations, and Configuration Processes on Cellulosic Ethanol Production from Pretreated Arundo donax

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