Alkaline sulfite/anthraquinone pretreatment followed by disk refining of<i>Pinus radiata</i>and<i>Pinus caribaea</i>wood chips for biochemical ethanol production

Franco, Heriberto; Ferraz, André; Milagres, Adriane M. F.; Carvalho, Walter; Freer, Juanita; Baeza, Jaime; Mendonça, Regis Teixeira

doi:10.1002/jctb.2761

Cited by 14 publications

(7 citation statements)

References 28 publications

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“…Alkaline-sulfite chemithermomechanical pretreatment has proved to be an efficient way to reduce the recalcitrance of wood and grass lignocellulosic materials. 6,8,10,21 In grasses such as sugar cane bagasse, a previous study has demonstrated that efficient hydrolysis of polysaccharides in the pretreated material can be obtained even with modest delignification and a high yield of pretreated solids (65-85%). 6 In the present work, sugarcane bagasse was pretreated with the alkaline-sulfite process under mild conditions with varied cooking times ( Table 1).…”

Section: Resultsmentioning

confidence: 99%

Enzymatic digestion of alkaline‐sulfite pretreated sugar cane bagasse and its correlation with the chemical and structural changes occurring during the pretreatment step

Mendes

Laurito

Bazzeggio

et al. 2013

Biotechnology Progress

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Sugar cane bagasse is recalcitrant to enzymatic digestion, which hinders the efficient conversion of its polysaccharides into fermentable sugars. Alkaline-sulfite pretreatment was used to overcome the sugar cane bagasse recalcitrance. Chemical and structural changes that occurred during the pretreatment were correlated with the efficiency of the enzymatic digestion of the polysaccharides. The first 30 min of pretreatment, which removed approximately half of the initial lignin and 30% of hemicellulose seemed responsible for a significant enhancement of the cellulose conversion level, which reached 64%. After the first 30 min of pretreatment, delignification increased slightly, and hemicellulose removal was not enhanced; however, acid groups continued to be introduced into the residual lignin. Water retention values were 145% to the untreated bagasse and 210% to the bagasse pretreated for 120 min and fiber widths increased from 10.4 to 30 μm, respectively. These changes were responsible for an additional increase in the efficiency of enzymatic hydrolysis of the cellulose, which reached 92% with the 120 min pretreated sample.

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Section: Resultsmentioning

confidence: 99%

Enzymatic digestion of alkaline‐sulfite pretreated sugar cane bagasse and its correlation with the chemical and structural changes occurring during the pretreatment step

Mendes

Laurito

Bazzeggio

et al. 2013

Biotechnology Progress

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“…Direct comparison with reported data in literature is not straightforward since the process variables (selected raw material, pretreatment and the conditions of solid and enzyme loadings used in the saccharification and fermentation) may vary substantially. Nevertheless, literature reported works comparing strategies of saccharification and fermentation [43][44][45]. Ethanol concentration (39.9 g/L) from acid treated rapeseed (180°C for 20 min and 0.5% H 2 SO 4 ) by SHF was higher than results obtained by SSF and presaccharification and simultaneous saccharification and fermentation (PSSF) at high solid loadings, 20% of solids [43].…”

Section: Effect Of Autohydrolysis Severity On Ethanol Productionmentioning

confidence: 98%

Evaluation of strategies for second generation bioethanol production from fast growing biomass Paulownia within a biorefinery scheme

et al. 2017

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h i g h l i g h t s Autohydrolysis of Paulownia biomass was studied as first step of a biorefinery. At S 0 = 4.19, 78.9% of xylan was recovered as xylose and xylooligosaccharides. At S 0 = 4.19, 47% higher ethanol concentration was achieved by SHF than SSF. At S 0 = 4.72, 52.7 g/L of ethanol (80% of conversion) was obtained by SSF. An energy production of 648,074 MJ/ haÁyear could be produced from this process. g r a p h i c a l a b s t r a c t Cellulose 39.73 g/100 g RM Hemicellulose 17.98 g/100 g RM • 14.69 g Xylan/100 g RM • 3.29 g Acetyl groups/100 g RM Lignin 21.84 g /100 g RM

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“…The three microorganisms proved to be suitable for fermenting sugars to ethanol in SSSF strategy. In a recent work, Franco et al [38] carried out the SSSF process (24 h of presaccharification and 24 h of SSF) using delignified Pinus radiata and S. cerevisiae, resulting in the production of 15.5 g/L of ethanol with a yield of 90.0%. Furthermore, Gonçalves et al [15] reported ethanol production and ethanol yield values by S. cerevisiae, P. stipitis and Z. mobilis in SSSF using CFM pretreated by autohydrolysis of 7.71, 8.78 and 7.63 g/L, 90.09%, 87.25% and 89.16%, respectively.…”

Section: Sourcementioning

confidence: 99%

Bioethanol production by Saccharomyces cerevisiae, Pichia stipitis and Zymomonas mobilis from delignified coconut fibre mature and lignin extraction according to biorefinery concept

et al. 2016

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In search to increase the offer of liquid, clean, renewable and sustainable energy in the world energy matrix, the use of lignocellulosic materials (LCMs) for bioethanol production arises as a valuable alternative. The objective of this work was to analyze and compare the performance of Saccharomyces cerevisiae, Pichia stipitis and Zymomonas mobilis in the production of bioethanol from coconut fibre mature (CFM) using different strategies: simultaneous saccharification and fermentation (SSF) and semisimultaneous saccharification and fermentation (SSSF). The CFM was pretreated by hydrothermal pretreatment catalyzed with sodium hydroxide (HPCSH). The pretreated CFM was characterized by X-ray diffractometry and SEM, and the lignin recovered in the liquid phase by FTIR and TGA. After the HPCSH pretreatment (2.5% (v/v) sodium hydroxide at 180 C for 30 min), the cellulose content was 56.44%, while the hemicellulose and lignin were reduced 69.04% and 89.13%, respectively. Following pretreatment, the obtained cellulosic fraction was submitted to SSF and SSSF. Pichia stipitis allowed for the highest ethanol yield e 90.18% e in SSSF, 91.17% and 91.03% were obtained with Saccharomyces cerevisiae and Zymomonas mobilis, respectively. It may be concluded that the selection of the most efficient microorganism for the obtention of high bioethanol production yields from cellulose pretreated by HPCSH depends on the operational strategy used and this pretreatment is an interesting alternative for add value of coconut fibre mature compounds (lignin, phenolics) being in accordance with the biorefinery concept.

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Alkaline sulfite/anthraquinone pretreatment followed by disk refining ofPinus radiataandPinus caribaeawood chips for biochemical ethanol production

Cited by 14 publications

References 28 publications

Enzymatic digestion of alkaline‐sulfite pretreated sugar cane bagasse and its correlation with the chemical and structural changes occurring during the pretreatment step

Enzymatic digestion of alkaline‐sulfite pretreated sugar cane bagasse and its correlation with the chemical and structural changes occurring during the pretreatment step

Evaluation of strategies for second generation bioethanol production from fast growing biomass Paulownia within a biorefinery scheme

Bioethanol production by Saccharomyces cerevisiae, Pichia stipitis and Zymomonas mobilis from delignified coconut fibre mature and lignin extraction according to biorefinery concept

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