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Highly selective valorisation of D-xylose from corncobs hydrolysates catalysed by C-scorpionate gold(III) complexes

2026-09Artigo científico Acesso aberto
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datacite.subject.fosEngenharia e Tecnologia::Engenharia Química
datacite.subject.fosEngenharia e Tecnologia::Outras Engenharias e Tecnologias
datacite.subject.sdg07:Energias Renováveis e Acessíveis
datacite.subject.sdg12:Produção e Consumo Sustentáveis
dc.contributor.authorVan-Dúnem, Vanmira
dc.contributor.authorDuarte, Luís
dc.contributor.authorMartins, Pedro L.
dc.contributor.authorLapa, Hugo
dc.contributor.authorMartins, Luisa Margarida
dc.contributor.authorCarvalheiro, Florbela
dc.date.accessioned2026-09-25T14:38:25Z
dc.date.available2026-09-25T14:38:25Z
dc.date.issued2026-09
dc.description.abstractABSTRACT: D-xylonic acid is a multifunctional, environmentally friendly, and versatile platform chemical, and one of the most promising conversion products of D-xylose for replacing several petrochemicals that is still not produced commercially. Although microbial conversion is the most widely studied process, the low efficiency and cost of these methods create opportunities for the development of chemical routes. In this work, we report for the first time the direct chemical conversion of real hemicellulose-derived pentose-rich hydrolysates into D-xylonic acid. Furthermore, a novel chemical oxidation route based on C-scorpionate gold(III) complexes was explored. Two specific complexes are used as model catalysts, the cationic [AuCl2(kappa 2-Tpm)]Cl (1, Tpm = hydrotris(pyrazol-1-yl)methane, HC(C3N2H3)(3)) or the neutral [AuCl2(kappa 2-Tpms)] complex (2, Tpms = tris(1H-pyrazol-1-yl)methane sulfonate, [SO3C(C3H3N2)(3)](-)). The catalytic operational conditions (i.e., reaction time, temperature, type and concentration of alkali and oxidant agent) were initially optimised for D-xylose solutions using cationic complex 1. Under the best conditions (100 degrees C, 2 mmol NaOH and 20 mmol H2O2) nearly 100% conversion of D-xylose and a 94% D-xylonic acid yield were achieved, with minimal formation of secondary products, when using 6 g/L D-xylose as sole carbon substrate. The direct catalytic conversion of real hemicellulosic hydrolysate, without any previous purification was possible and up to 36 g/L of D-xylose, regardless of the presence of other sugars, aliphatic acids, furans and phenolic compounds. Comparing similar catalytic conditions among model D-xylose solutions and real hydrolysates with similar titres, the later presented better performance, even though D-xylose conversion and D-xylonic acid yield decreased slightly for higher D-xylose concentrations. The catalysis was further improved by using the neutral gold(III) C-scorpionate complex 2, which further increased the D-xylose conversion and selectivity.eng
dc.identifier.citationVan-Dúnem, V., Duarte, L., Martins, P., Lapa, H., Martins, L., & Carvalheiro, F. (2026). Highly selective valorisation of D-xylose from corncobs hydrolysates catalysed by C-scorpionate gold(III) complexes. In: Biomass Conversion and Biorefinery, 2026, vol. 16 (18), article 338. https://doi.org/10.1007/s13399-026-07225-4
dc.identifier.doi10.1007/s13399-026-07225-4
dc.identifier.eissn2190-6823
dc.identifier.issn2190-6815
dc.identifier.urihttp://hdl.handle.net/10400.9/6486
dc.language.isoeng
dc.peerreviewedyes
dc.publisherSpringer
dc.relationAdvanced biomass fractionation processes and improved catalytic upgrading of sugars and phenolic compounds into value-added products
dc.relationBiomass and Bioenergy Research Infrastructure
dc.relationCentro de Química Estrutural
dc.relationInstitute of Molecular Sciences
dc.relationPROCESSING COMPLEX MATRICES: DESCRIPTION, REACTION-SEPARATION, MODELLING
dc.relation.hasversionhttps://link.springer.com/article/10.1007/s13399-026-07225-4?utm_source=getftr&utm_medium=getftr&utm_campaign=getftr_pilot&getft_integrator=clarivate
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectXylose
dc.subjectCatalytic oxidation
dc.subjectCorncobs
dc.subjectXylitol
dc.subjectHydrolysate detoxification
dc.subjectBiomass
dc.titleHighly selective valorisation of D-xylose from corncobs hydrolysates catalysed by C-scorpionate gold(III) complexeseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumber2020.05991.BD
oaire.awardNumberPINFRA/22059/2016
oaire.awardNumberUIDB/00100/2020
oaire.awardNumberLA/P/0056/2020
oaire.awardNumber101130523
oaire.awardTitleAdvanced biomass fractionation processes and improved catalytic upgrading of sugars and phenolic compounds into value-added products
oaire.awardTitleBiomass and Bioenergy Research Infrastructure
oaire.awardTitleCentro de Química Estrutural
oaire.awardTitleInstitute of Molecular Sciences
oaire.awardTitlePROCESSING COMPLEX MATRICES: DESCRIPTION, REACTION-SEPARATION, MODELLING
oaire.awardURIhttp://hdl.handle.net/10400.9/6484
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/9444 - RNIIIE/PINFRA%2F22059%2F2016/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00100%2F2020/PT
oaire.awardURIhttp://hdl.handle.net/10400.9/6434
oaire.awardURIhttp://hdl.handle.net/10400.9/6485
oaire.citation.issue18
oaire.citation.titleBiomass Conversion and Biorefinery
oaire.citation.volume16
oaire.fundingStream9444 - RNIIIE
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStreamConcurso para Atribuição do Estatuto e Financiamento de Laboratórios Associados (LA)
oaire.fundingStreamHORIZON EIC Grants
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameVan-Dúnem
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person.givenNameLuisa Margarida
person.givenNameFlorbela
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project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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