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Mathematical modeling of the thermal degradation kinetics of vitamin C in cupuaçu (Theobroma grandiflorum) nectar

2000Journal article Open access
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dc.contributor.authorVieira, Margarida C.
dc.contributor.authorTeixeira, A. A.
dc.contributor.authorSilva, C. L. M.
dc.date.accessioned2011-10-23T08:53:27Z
dc.date.available2011-10-23T08:53:27Z
dc.date.issued2000
dc.description.abstractThe thermal degradation kinetics of both components of vitamin C, ascorbic acid (AA) and dehydroascorbic acid (DHAA), were determined in a nectar of Cupuacßu (Theobroma grandi¯orum) with 25% of pulp and 15% of sugar in water. AA was assayed by HPLC and the results showed that AA degraded into DHAA. A reversible ®rst order model described well the AA degradation data, with an activation energy of 74 5 kJ/mol and k80 C 0:032 0:003min ÿ1. DHAA kinetic behavior suggested a consecutive ®rst order reaction where DHAA was the intermediate product of AA degradation. A mechanistic model was derived to predict DHAA concentration. Rate constants were replaced by the Arrhenius equation in the model to evaluate the temperature dependence and the kinetic parameters for AA degradation, previously determined, were used. An activation energy of 65 9 kJ/mol and a k80 C of 0:013 0:003 min ÿ1 were estimated. The present ®ndings will help to predict the best Cupuacßu nectar processing conditions that minimize degradation of an important quality factor such as vitamin C.por
dc.identifier.citationVIEIRA, Margarida C.; TEIXEIRA, A. A.; SILVA, C. L. M. - Mathematical modeling of the thermal degradation kinetics of vitamin C in cupuaçu (Theobroma grandiflorum) nectar. Journal of Food Engineering.ISSN 0260-8774. Vol. 43 (2000), p. 1-7por
dc.identifier.urihttp://hdl.handle.net/10400.14/6912
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.relation.publisherversiondoi:10.1016/S0260-8774(99)00121-1por
dc.subjectCupuaçupor
dc.subjectAscorbic acidpor
dc.subjectDehydroascorbic acidpor
dc.subjectThermal treatment kineticspor
dc.subjectModelingpor
dc.titleMathematical modeling of the thermal degradation kinetics of vitamin C in cupuaçu (Theobroma grandiflorum) nectarpor
dc.typejournal article
dspace.entity.typePublication
person.familyNameVieira
person.familyNameSilva
person.givenNameMargarida
person.givenNameCristina
person.identifier1473674
person.identifier.ciencia-id3314-4EFC-1E4A
person.identifier.ciencia-id6611-634A-132C
person.identifier.orcid0000-0003-2774-706X
person.identifier.orcid0000-0002-0495-3955
person.identifier.ridE-1805-2012
person.identifier.ridA-3568-2013
person.identifier.scopus-author-id7202140775
person.identifier.scopus-author-id7201387397
rcaap.rightsopenAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication309a0970-cf9e-45aa-90a8-aa2f2ba96fc0
relation.isAuthorOfPublication4e2903de-0679-4cb1-981e-10de14c0c995
relation.isAuthorOfPublication.latestForDiscovery4e2903de-0679-4cb1-981e-10de14c0c995

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