Comparative study of biorefinery processes for the valorization of fast-growing Paulownia wood

Río, Pablo G. del; Domínguez, Viana D.; Domínguez, Elena R. Rosa; Gullón, Patricia; Gullón, Beatriz; Garrote, Gil; Romaní, Aloia

doi:10.1016/j.biortech.2020.123722

Cited by 29 publications

(10 citation statements)

References 44 publications

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“…Referring to the solid fraction, the glucan content stayed at similar values throughout the temperatures (55.4-62.6 g of glucan/100 g of autohydrolyzed corn stover) with an average recovery of 87.4% regarding the initial glucan. Klason lignin values varied between 28.5 and 39.7 g of lignin/100 g autohydrolyzed corn stover (with an average recovery of 87.0%), showing some degree of lignin solubilization at lower temperatures as reported for other lignocellulosic biomasses such as Eucalyptus globulus [40] and higher recoveries in harsher conditions due to lignin repolimerization as explained for Paulownia wood [20] and vine shoots [41]. In addition, the relative percentage of acid-insoluble lignin extracted from hydrothermal pretreatment under high-severity conditions can be considered as pseudo-lignin [42], which could be formed through reactions on lignin aromatic rings or acid-catalyzed condensation reactions on fragmented polysaccharides [43].…”

Section: Raw Materials and Autohydrolysis Treatment: Chemical Analysi...mentioning

confidence: 63%

“…This may contribute to surpassing the natural recalcitrance of the lignocellulose against degradation, enabling hemicellulose or lignin solubilization while enhancing the enzymatic susceptibility of cellulose [16][17][18]. Among the most appealing pretreatments, the employment of an eco-friendly process, such as autohydrolysis, is appropriate for this purpose [19,20]. In this case, the autohydrolysis process consists of mixing water with the raw material in a high-pressurized reactor at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

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A Whole-Slurry Fermentation Approach to High-Solid Loading for Bioethanol Production from Corn Stover

Río¹,

Gullón²,

Rebelo³

et al. 2020

Agronomy

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Corn stover is the most produced byproduct from maize worldwide. Since it is generated as a residue from maize harvesting, it is an inexpensive and interesting crop residue to be used as a feedstock. An ecologically friendly pretreatment such as autohydrolysis was selected for the manufacture of second-generation bioethanol from corn stover via whole-slurry fermentation at high-solid loadings. Temperatures from 200 to 240 °C were set for the autohydrolysis process, and the solid and liquid phases were analyzed. Additionally, the enzymatic susceptibility of the solid phases was assessed to test the suitability of the pretreatment. Afterward, the production of bioethanol from autohydrolyzed corn stover was carried out, mixing the solid with different percentages of the autohydrolysis liquor (25%, 50%, 75%, and 100%) and water (0% of liquor), from a total whole slurry fermentation (saving energy and water in the liquid–solid separation and subsequent washing of the solid phase) to employing water as only liquid medium. In spite of the challenging scenario of using the liquor fraction as liquid phase in the fermentation, values between 32.2 and 41.9 g ethanol/L and ethanol conversions up to 80% were achieved. This work exhibits the feasibility of corn stover for the production of bioethanol via a whole-slurry fermentation process.

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Section: Raw Materials and Autohydrolysis Treatment: Chemical Analysi...mentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

A Whole-Slurry Fermentation Approach to High-Solid Loading for Bioethanol Production from Corn Stover

Río¹,

Gullón²,

Rebelo³

et al. 2020

Agronomy

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“…The raw material employed in this study was Paulownia wood, a fast-growing species with interesting features as renewable energy resource due to its high biomass production (50 t/ha•year) and tolerance to abiotic stress conditions [28,29]. Cellulosic fraction of Paulownia wood was already employed for bioethanol production via a sequential two-stage autohydrolysis [30] and through the combination of autohydrolysis and organosolv [31], or for pulping purposes via soda-anthraquinone processing [29]. However, in order to exploit Paulownia wood for energy purposes the employment of the totality of polysaccharides present in this feedstock is essential to improve the feasibility of the process.…”

Section: Introductionmentioning

confidence: 99%

Hemicellulosic Bioethanol Production from Fast-Growing Paulownia Biomass

Domínguez¹,

Río

Romaní

et al. 2021

Processes

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In order to exploit a fast-growing Paulownia hardwood as an energy crop, a xylose-enriched hydrolysate was obtained in this work to increase the ethanol concentration using the hemicellulosic fraction, besides the already widely studied cellulosic fraction. For that, Paulownia elongata x fortunei was submitted to autohydrolysis treatment (210 °C or S0 of 4.08) for the xylan solubilization, mainly as xylooligosaccharides. Afterwards, sequential stages of acid hydrolysis, concentration, and detoxification were evaluated to obtain fermentable sugars. Thus, detoxified and non-detoxified hydrolysates (diluted or not) were fermented for ethanol production using a natural xylose-consuming yeast, Scheffersomyces stipitis CECT 1922, and an industrial Saccharomyces cerevisiae MEC1133 strain, metabolic engineered strain with the xylose reductase/xylitol dehydrogenase pathway. Results from fermentation assays showed that the engineered S. cerevisiae strain produced up to 14.2 g/L of ethanol (corresponding to 0.33 g/g of ethanol yield) using the non-detoxified hydrolysate. Nevertheless, the yeast S. stipitis reached similar values of ethanol, but only in the detoxified hydrolysate. Hence, the fermentation data prove the suitability and robustness of the engineered strain to ferment non-detoxified liquor, and the appropriateness of detoxification of liquor for the use of less robust yeast. In addition, the success of hemicellulose-to-ethanol production obtained in this work shows the Paulownia biomass as a suitable renewable source for ethanol production following a suitable fractionation process within a biorefinery approach.

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“…Nonetheless, the appropriate conditions for XOS production are insufficient for high cellulose-to-glucose conversion. To achieve high glucose concentrations and, subsequently, high ethanol yields from hardwood, a delignification process is usually applied to increase the glucan content and improve the enzymatic convertibility of glucan into glucose (Romaní et al 2019;del Río et al, 2020). As an alternative to this costly and hazardous delignification process, GM-derived sugars may be used to boost the sugar concentration and, consequently, final ethanol concentration.…”

Section: Ethanol Production From Pretreated Vsmentioning

confidence: 99%

Multi-feedstock biorefinery concept: Valorization of winery wastes by engineered yeast

Baptista

Romaní

Cunha

et al. 2023

Journal of Environmental Management

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Comparative study of biorefinery processes for the valorization of fast-growing Paulownia wood

Cited by 29 publications

References 44 publications

A Whole-Slurry Fermentation Approach to High-Solid Loading for Bioethanol Production from Corn Stover

A Whole-Slurry Fermentation Approach to High-Solid Loading for Bioethanol Production from Corn Stover

Hemicellulosic Bioethanol Production from Fast-Growing Paulownia Biomass

Multi-feedstock biorefinery concept: Valorization of winery wastes by engineered yeast

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