Triplet state energy of the carotenoid bixin determined by photoacoustic calorimetry

dc.creatorRios, ADO
dc.creatorMercadante, AZ
dc.creatorBorsarelli, CD
dc.date2007
dc.date2014-11-14T07:51:28Z
dc.date2015-11-26T16:05:18Z
dc.date2014-11-14T07:51:28Z
dc.date2015-11-26T16:05:18Z
dc.date.accessioned2018-03-28T22:54:17Z
dc.date.available2018-03-28T22:54:17Z
dc.identifierDyes And Pigments. Elsevier Sci Ltd, v. 74, n. 3, n. 561, n. 565, 2007.
dc.identifier0143-7208
dc.identifierWOS:000245414600010
dc.identifier10.1016/j.dyepig.2006.03.018
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/77015
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/77015
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/77015
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1265670
dc.descriptionThe triplet state energy level of the natural cis-carotenoid bixin (methyl hydrogen 9'Z-6,6-diapocarotene-6,6'-dioate) was determined using laser-induced photoacoustic calorimetry (PAC) in acetonitrile/methanol (1: 1) solution. An energy-transfer process with anthracene as sensitizer in O-2-saturated solution was used to populate the carotenoid triplet state. The energy balance of the system allowed the calculation of the triplet energy content of bixin as E-T = 18 +/- 2 kcal/mol. The result is discussed in relation with both its singlet molecular oxygen quenching and cis trans isomedzation abilities. The quantum yield, Phi = 0.69, for the formation of either the triplet state or the singlet molecular oxygen by the sensitizer anthracene was also determined. (c) 2006 Elsevier Ltd. All rights reserved.
dc.description74
dc.description3
dc.description561
dc.description565
dc.languageen
dc.publisherElsevier Sci Ltd
dc.publisherOxford
dc.publisherInglaterra
dc.relationDyes And Pigments
dc.relationDyes Pigment.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectbixin
dc.subjectcarotenoids
dc.subjecttriplet state
dc.subjectenergy-transfer
dc.subjectphotoacoustic calorimetry (PAC)
dc.subjectThermal-degradation Products
dc.subjectFood Coloring Formulations
dc.subjectSinglet Oxygen
dc.subjectAqueous-solution
dc.subjectRate Constants
dc.subjectAnnatto
dc.subjectChromatography
dc.subjectSystem
dc.subjectModel
dc.titleTriplet state energy of the carotenoid bixin determined by photoacoustic calorimetry
dc.typeArtículos de revistas


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