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Sugarcane bagasse delignification with potassium hydroxide for enhanced enzymatic hydrolysis

2016Journal article Open access
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dc.contributor.authorPaixão, Susana M.
dc.contributor.authorLadeira, S. A.
dc.contributor.authorSilva, Tiago
dc.contributor.authorArez, B. F.
dc.contributor.authorRoseiro, J. Carlos
dc.contributor.authorMartins, M. L. L.
dc.contributor.authorAlves, Luís
dc.date.accessioned2016-03-23T13:12:58Z
dc.date.available2016-03-23T13:12:58Z
dc.date.issued2016
dc.description.abstractThe optimization of an alkaline pretreatment process for the delignification of sugarcane bagasse (SCB) to enhance the subsequent enzymatic hydrolysis was performed according to the Doehlert uniform shell design. In this experimental design, the effect of two factors—potassium hydroxide (KOH) concentration and autoclaving time at 121 C (1 atm)—on cellulose, hemicellulose, or the total polysaccharide and lignin content in SCB was evaluated. This response surface methodology revealed that KOH concentration is the factor that most influences the chemical characteristics of treated SCB (SCBt), with optimal conditions for the highest delignification being KOH in the range 5–10% (w/v) and an autoclaving time of 35 min, which provides an average of 97% total polysaccharides without inhibitor accumulation (furfural, 5-hydroxymethyl furfural) and #5% lignin. SCBt samples from two pretreatment conditions (KOH 3.25% – 13 min; KOH 10% – 35 min) were selected, based on the greatest delignification (70–74%) and polysaccharide availability (95–97%) after pretreatment, and further hydrolysed for fermentable sugar production. High sugar yields were obtained from both the pretreated samples (866 to 880 mg sugar per g biomass, respectively) in contrast with the 129 mg sugar per g raw biomass obtained from untreated SCB. These results demonstrate the effectiveness of KOH alkali pretreatments, which improves the overall digestibility of raw SCB polysaccharides from about 18% up to 91%. However, harsh alkali treatment (KOH 10%) is the most effective if the highest glucose/xylose ratio in the final sugar-rich hydrolysate is the aim. Hence, the use of sugar-rich hydrolysates obtained from SCBt as the carbon source for industrial purposes may provide a sustainable and economic solution for the production of bio-based added-value products, such as second generation (2G) bioethanol.pt_PT
dc.identifier.citationPaixão, S.M.; Ladeira, S.A.; Silva, T.P.; Arez, B.F.; Roseiro, J.C.; Martins, M.L.L.; Alves, L. - Sugarcane bagasse delignification with potassium hydroxide for enhanced enzymatic hydrolysis. In: RSC Advances, 2016, Vol. 6, p. 1042-1052pt_PT
dc.identifier.doi10.1039/c5ra14908hpt_PT
dc.identifier.issn2046-2069
dc.identifier.urihttp://hdl.handle.net/10400.9/2898
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherRoyal Society of Chemistrypt_PT
dc.relation.publisherversionhttp://dx.doi.org/10.1039/c5ra14908hpt_PT
dc.subjectSugarcane bagassept_PT
dc.subjectAlkali pretreatmentpt_PT
dc.subjectEnzymatic hydrolysispt_PT
dc.subjectBioethanolpt_PT
dc.titleSugarcane bagasse delignification with potassium hydroxide for enhanced enzymatic hydrolysispt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage1052pt_PT
oaire.citation.startPage1042pt_PT
oaire.citation.titleRSC Advancespt_PT
oaire.citation.volume6pt_PT
person.familyNamePaixão
person.familyNameSilva
person.familyNameRoseiro
person.familyNameAlves
person.givenNameSusana M.
person.givenNameTiago
person.givenNameJosé
person.givenNameLuís
person.identifier.ciencia-id7918-C133-C5FB
person.identifier.ciencia-idE418-9EE4-9BB4
person.identifier.ciencia-idDA18-CA15-76B7
person.identifier.ciencia-id561B-53A5-7359
person.identifier.orcid0000-0003-0955-4467
person.identifier.orcid0000-0003-0120-557X
person.identifier.orcid0000-0003-3119-6416
person.identifier.orcid0000-0001-6245-775X
person.identifier.ridF-5453-2019
person.identifier.scopus-author-id6603112228
person.identifier.scopus-author-id7004090071
person.identifier.scopus-author-id6701310833
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublicatione1aa2856-62bc-46dd-9922-9727b1158981
relation.isAuthorOfPublicationc07d7af9-191c-4bcc-af5f-255b7fb52060
relation.isAuthorOfPublication.latestForDiscovery4c11e382-9f04-42cc-9ca0-a4ade44298f1

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