Utilize este identificador para referenciar este registo:
https://hdl.handle.net/10316/95042
Campo DC | Valor | Idioma |
---|---|---|
dc.contributor.author | Sharma, Mohit | - |
dc.contributor.author | Aguado, Roberto | - |
dc.contributor.author | Murtinho, Dina | - |
dc.contributor.author | Valente, Artur J. M. | - |
dc.contributor.author | Ferreira, Paulo J. T. | - |
dc.date.accessioned | 2021-06-09T15:05:35Z | - |
dc.date.available | 2021-06-09T15:05:35Z | - |
dc.date.issued | 2021-05-28 | - |
dc.identifier.issn | 01418130 | pt |
dc.identifier.uri | https://hdl.handle.net/10316/95042 | - |
dc.description.abstract | Transesterification 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.iso | eng | pt |
dc.publisher | Elsevier | pt |
dc.relation | info:eu-repo/grantAgreement/The inpactus - Innovative Products and Technologies from Eucalyptus, Project/21874 | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/UID/QUI/00313/2020 | pt |
dc.relation | info:eu-repo/grantAgreement/FCTUIDB/00102/ 2020 | pt |
dc.rights | embargoedAccess | pt |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | pt |
dc.subject | Betaine methyl ester | pt |
dc.subject | Starch betainate | pt |
dc.subject | Transesterification | pt |
dc.title | Novel approach on the synthesis of starch betainate by transesterification | pt |
dc.type | article | - |
degois.publication.firstPage | 1681 | pt |
degois.publication.lastPage | 1689 | pt |
degois.publication.title | International Journal of Biological Macromolecules | pt |
dc.relation.publisherversion | https://www.sciencedirect.com/science/article/pii/S0141813021011569 | pt |
dc.peerreviewed | yes | pt |
dc.identifier.doi | 10.1016/j.ijbiomac.2021.05.175 | pt |
degois.publication.volume | 182 | pt |
dc.date.embargo | 2021-11-24 | * |
uc.date.periodoEmbargo | 180 | pt |
item.fulltext | Com Texto completo | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.openairetype | article | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
crisitem.project.grantno | info:eu-repo/grantAgreement/The inpactus - Innovative Products and Technologies from Eucalyptus, Project/21874 | - |
crisitem.author.researchunit | CQC - Coimbra Chemistry Centre | - |
crisitem.author.researchunit | CQC - Coimbra Chemistry Centre | - |
crisitem.author.researchunit | CQC - Coimbra Chemistry Centre | - |
crisitem.author.researchunit | CIEPQPF – Chemical Process Engineering and Forest Products Research Centre | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.orcid | 0000-0001-9864-1794 | - |
crisitem.author.orcid | 0000-0002-1391-9855 | - |
crisitem.author.orcid | 0000-0002-4612-7686 | - |
crisitem.author.orcid | 0000-0002-4503-6811 | - |
Aparece nas coleções: | I&D CERES - Artigos em Revistas Internacionais |
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Sharma2021_accepted version | 610.99 kB | Adobe PDF | Ver/Abrir |
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