Por favor, use este identificador para citar o enlazar este ítem:
https://repositorio.ufba.br/handle/ri/5591
metadata.dc.type: | Artigo de Periódico |
Título : | Influence of Heating Time and Metal Ions on the Amount of Free Fatty Acids and Formation Rates of Selected Carbonyl Compounds during the Thermal Oxidation of Canola Oil |
Otros títulos : | Journal of Agricultural And Food Chemistry |
Autor : | Bastos, Luciane Conceição Silva Pereira, Pedro Afonso de Paula |
metadata.dc.creator: | Bastos, Luciane Conceição Silva Pereira, Pedro Afonso de Paula |
Resumen : | Canola oil was heated continuously for 8 h at a typical frying temperature (180 C) in the presence of various concentrations of the metal ions Fe(III), Cu(II), and Al(III) (9.2, 27.5, and 46.0 μg L-1 of oil) to evaluate changes occurring in the amount of free fatty acids, expressed as acidity index, and in the formation rates of aldehydes. The aldehydes were collected and derivatized in silica cartridges functionalized with C18 and impregnated with an acid solution of 2,4-dinitrophenylhydrazine, after which they were eluted with acetonitrile and analyzed by LC-DAD-MS. Among the substances emitted,the following were identified and quantified: formaldehyde, acetaldehyde, acrolein, propanal, butanal,hexanal, (E)-2-heptenal, and octanal. During heating of the oil, the compounds presenting the highest mean formation rates were acrolein, hexanal, and acetaldehyde. In the study of the metal ions, the addition of ions to the samples generally led to a corresponding increase in the formation rates of the eight substances. The compounds showing the highest relative increases in formation rates were formaldehyde, acetaldehyde, propanal, and heptenal. In terms of catalytic effect, copper proved to be the most efficient in promoting increased formation rates, followed by iron and aluminum. |
Palabras clave : | Canola oil Thermal oxidation Aldehydes Formation rates Metal ions LC-DAD-MS |
URI : | http://www.repositorio.ufba.br/ri/handle/ri/5591 |
Fecha de publicación : | 2010 |
Aparece en las colecciones: | Artigo Publicado em Periódico (Química) |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
C__Documents and Settings_rep...t.default_Cache_6_2A_5CAD4d01.pdf Restricted Access | 432,82 kB | Adobe PDF | Visualizar/Abrir Request a copy |
Los ítems de DSpace están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.