Importance Of Cis-isomer Separation In Determining Provitamin A In Tomato And Tomato Products

dc.creatorRodriguez-Amaya D.B.
dc.creatorTavares C.A.
dc.date1992
dc.date2015-06-30T14:21:13Z
dc.date2015-11-26T14:42:59Z
dc.date2015-06-30T14:21:13Z
dc.date2015-11-26T14:42:59Z
dc.date.accessioned2018-03-28T21:50:52Z
dc.date.available2018-03-28T21:50:52Z
dc.identifier
dc.identifierFood Chemistry. , v. 45, n. 4, p. 297 - 302, 1992.
dc.identifier3088146
dc.identifier10.1016/0308-8146(92)90163-V
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-0026665320&partnerID=40&md5=fabb5f0742d9cefbcb9424fec6e30acc
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/99456
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/99456
dc.identifier2-s2.0-0026665320
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1251495
dc.descriptionAn attempt was made to estimate the error in the determination of the vitamin A value (activity) when the cis- and trans-isomers are not separated and quantified individually. In 10 sample lots of fresh tomatoes, cis-isomers were not detected. However, in 52 samples of tomato products, varying amounts of cis-isomers of β-carotene were found. Utilising the currently employed calculation procedure, overestimations of 8-13% in juice, 10-66% in puree and paste, 15-26% in ketchup were observed when isomer separation was not undertaken. When column loss was taken into consideration, these errors decreased to 4-8%, 6-62% and 11-21%, respectively. Using the biopotencies obtained by Sweeney and Marsh (1970), aside from column loss, the overestimations were 4-8%, 3-52% and 7-15%, respectively. Thus, the error can be considerable, but the magnitude depends on how the calculation is carried out, demonstrating the necessity of establishing the true biopotencies, aside from obtaining more efficient chromatographic separation and accurate quantitation. © 1992.
dc.description45
dc.description4
dc.description297
dc.description302
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dc.languageen
dc.publisher
dc.relationFood Chemistry
dc.rightsfechado
dc.sourceScopus
dc.titleImportance Of Cis-isomer Separation In Determining Provitamin A In Tomato And Tomato Products
dc.typeArtículos de revistas


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