Variability of Electron Spin Resonance (ESR) signal of γ -irradiated starches

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dc.contributor.authorSILVA, GILBERTO D.
dc.contributor.authorRODRIGUES JUNIOR, ORLANDO
dc.contributor.authorDEL MASTRO, NELIDA L.
dc.coverageInternacionalpt_BR
dc.creator.eventoINTERNATIONAL NUCLEAR ATLANTIC CONFERENCEpt_BR
dc.date.accessioned2018-01-04T11:54:07Z
dc.date.available2018-01-04T11:54:07Z
dc.date.eventoOctober 22-27, 2017pt_BR
dc.description.abstractFood preservation is one of the practical applications of radiation processing of materials. Starch is an abundant and cheap nutritious biopolymer and also is the material for appropriate food systems and for technical industries. Starch granules are partially crystalline structures composed mainly of two types of starch: amylose, an essentially linear polymer, and amylopectin, with 3-44% of branch points. Electron spin resonance (ESR) spectroscopy is a very powerful and sensitive method for the characterization of the electronic structures of materials with unpaired electrons. The aim of the present work was to monitor the disappearance of the shortlife and long-life free radicals formed during γ-irradiation of 3 different starches. Corn, potato and fermented cassava starches were irradiated in a 60Co source Gammacell 220 with 20 kGy, dose rate around 1 kGy h-1. EPR spectra were obtained at room temperature using a Bruker EMX plus model, X band equipment. The main type of ESR signal from irradiated starch is a singlet with a g-value of about 2.0. The fading of ESR signals was followed for 350 hours, and presents differences among the different starch type reflecting differences in molecular arrangements of starch crystalline and amorphous fractions, although ESR spectra seemed to be common for all starches.pt_BR
dc.event.siglaINACpt_BR
dc.identifier.citationSILVA, GILBERTO D.; RODRIGUES JUNIOR, ORLANDO; DEL MASTRO, NELIDA L. Variability of Electron Spin Resonance (ESR) signal of γ -irradiated starches. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 22-27, 2017, Belo Horizonte, MG. <b>Proceedings...</b> Rio de Janeiro, RJ: Associação Brasileira de Energia Nuclear, 2017. Disponível em: http://repositorio.ipen.br/handle/123456789/28217.
dc.identifier.orcidhttps://orcid.org/0000-0002-6704-1910
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/28217
dc.localRio de Janeiro, RJpt_BR
dc.local.eventoBelo Horizonte, MGpt_BR
dc.publisherAssociação Brasileira de Energia Nuclearpt_BR
dc.rightsopenAccesspt_BR
dc.subjectcassava
dc.subjectcobalt 60
dc.subjectdecay
dc.subjectelectron spin resonance
dc.subjectmaize
dc.subjectpotatoes
dc.subjectradiation effects
dc.subjectradicals
dc.subjectspectroscopy
dc.subjectstarch
dc.titleVariability of Electron Spin Resonance (ESR) signal of γ -irradiated starchespt_BR
dc.typeTexto completo de eventopt_BR
dspace.entity.typePublication
ipen.autorNELIDA LUCIA DEL MASTRO
ipen.autorORLANDO RODRIGUES JUNIOR
ipen.autorGILBERTO DIAS DA SILVA
ipen.codigoautor1225
ipen.codigoautor322
ipen.codigoautor13966
ipen.contributor.ipenauthorNELIDA LUCIA DEL MASTRO
ipen.contributor.ipenauthorORLANDO RODRIGUES JUNIOR
ipen.contributor.ipenauthorGILBERTO DIAS DA SILVA
ipen.date.recebimento18-01pt_BR
ipen.event.datapadronizada2017pt_BR
ipen.identifier.ipendoc24042pt_BR
ipen.notas.internasProceedingspt_BR
ipen.type.genreArtigo
relation.isAuthorOfPublication3c153344-3df9-4d73-8840-769187b0b885
relation.isAuthorOfPublicationf72d59d1-f942-442a-b16e-8b0ba0e2b671
relation.isAuthorOfPublication053bb34b-89c7-41a4-a05c-43eadf3de833
relation.isAuthorOfPublication.latestForDiscovery053bb34b-89c7-41a4-a05c-43eadf3de833
sigepi.autor.atividadeSILVA, GILBERTO D.:13966:210:Spt_BR
sigepi.autor.atividadeRODRIGUES JUNIOR, ORLANDO:322:330:Npt_BR
sigepi.autor.atividadeDEL MASTRO, NELIDA L.:1225:210:Npt_BR
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