Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/95042
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dc.contributor.authorSharma, Mohit-
dc.contributor.authorAguado, Roberto-
dc.contributor.authorMurtinho, Dina-
dc.contributor.authorValente, Artur J. M.-
dc.contributor.authorFerreira, Paulo J. T.-
dc.date.accessioned2021-06-09T15:05:35Z-
dc.date.available2021-06-09T15:05:35Z-
dc.date.issued2021-05-28-
dc.identifier.issn01418130pt
dc.identifier.urihttp://hdl.handle.net/10316/95042-
dc.description.abstractTransesterification of starch with methyl betainate was studied for the first time, both in aprotic media and in solid state, and both under alkaline and acidic conditions. Betaine hydrochloride was first esterified in methanol, attaining a conversion of 86%. Starch was then converted into starch betainate in either N,N-dimethylformamide or dimethyl sulfoxide, and using sulfuric acid as catalyst or pre-activating the polymer in NaOH/ethanol. Furthermore, solid-state transesterification was carried out in a ball mill, for which sulfuric acid was replaced with the less corrosive sulfamic acid. Cationic starch esters were characterised by 1H and 13C NMR spectroscopy, infrared spectroscopy, thermogravimetric analysis, viscometry, optical microscopy (in water) and scanning electron microscopy (dry). In solution, the process attained degrees of substitution up to 0.4. No by-products, dehydration, oxidation or colouring were detected, but starch underwent severe depolymerization in wet media. In solid state, whilst the resulting degree of substitution was lower, degradation was minimal. In any case, transesterification, with its variety of possibilities, yields cationic starches that offer a promising alternative to conventional ethers.pt
dc.language.isoengpt
dc.publisherElsevierpt
dc.relationinfo:eu-repo/grantAgreement/The inpactus - Innovative Products and Technologies from Eucalyptus, Project/21874pt
dc.relationinfo:eu-repo/grantAgreement/FCT/UID/QUI/00313/2020pt
dc.relationinfo:eu-repo/grantAgreement/FCTUIDB/00102/ 2020pt
dc.rightsembargoedAccesspt
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt
dc.subjectBetaine methyl esterpt
dc.subjectStarch betainatept
dc.subjectTransesterificationpt
dc.titleNovel approach on the synthesis of starch betainate by transesterificationpt
dc.typearticle-
degois.publication.firstPage1681pt
degois.publication.lastPage1689pt
degois.publication.titleInternational Journal of Biological Macromoleculespt
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0141813021011569pt
dc.peerreviewedyespt
dc.identifier.doi10.1016/j.ijbiomac.2021.05.175pt
degois.publication.volume182pt
dc.date.embargo2021-11-24*
uc.date.periodoEmbargo180pt
item.fulltextCom Texto completo-
item.languageiso639-1en-
item.grantfulltextembargo_20211124-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.researchunitCIEPQPF – Chemical Process Engineering and Forest Products Research Centre-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.orcid0000-0001-9864-1794-
crisitem.author.orcid0000-0002-1391-9855-
crisitem.author.orcid0000-0002-4612-7686-
crisitem.author.orcid0000-0002-4503-6811-
Appears in Collections:I&D CIEPQPF - Artigos em Revistas Internacionais
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