Autor(es):
Carapinha, Pedro Gomes 
Data: 2012
Identificador Persistente: http://hdl.handle.net/10400.5/5317
Origem: Repositório da UTL
Assunto(s): olive oil; extra virgin olive oil; frying; heating; thermoxidation
Detalhes do Documento
Utilização do azeite na fritura de alimentos
Descrição
Mestrado em Engenharia Alimentar - Processamento de Alimentos - Instituto Superior de Agronomia Olive oil has been widely used in the cuisine of the Mediterranean basin, due to its organoleptic properties and also to its oxidative thermostability.ascribed to the richness in monounsaturated fatty acids and high concentration of natural antioxidants. Two heating trials were performed to.evaluate the thermostability of two olive oils with the name: “extra virgin olive oil” and “olive oil” (moisture of virgin olive oil with refined olive oil): one of these trial consisted on heating at 180ºC (±2ºC) during 63 hours and the other one was a heating trial with frying periods of frozen potato chips, for 45 hours. Several physico-chemical parameters were evaluated in the different olive oil samples collected along the experiments: viscosity, acidity, peroxide index, p-anisidine, absorbance in the UV (232 and 270 nm), polar compounds and fatty acid profile. The results showed that oxidation was higher in the samples heated at 180°C than in the corresponding samples from the trials with frying periods due to the decrease in temperature when the frozen potatoes were immersed in the olive oil. The extra virgin olive oil showed more stability than the “olive oil”, due to the presence of higher concentrations of natural antioxidants which are removed during refining
Mestrado em Engenharia Alimentar - Processamento de Alimentos - Instituto Superior de Agronomia Olive oil has been widely used in the cuisine of the Mediterranean basin, due to its organoleptic properties and also to its oxidative thermostability.ascribed to the richness in monounsaturated fatty acids and high concentration of natural antioxidants. Two heating trials were performed to.evaluate the thermostability of two olive oils with the name: “extra virgin olive oil” and “olive oil” (moisture of virgin olive oil with refined olive oil): one of these trial consisted on heating at 180ºC (±2ºC) during 63 hours and the other one was a heating trial with frying periods of frozen potato chips, for 45 hours. Several physico-chemical parameters were evaluated in the different olive oil samples collected along the experiments: viscosity, acidity, peroxide index, p-anisidine, absorbance in the UV (232 and 270 nm), polar compounds and fatty acid profile. The results showed that oxidation was higher in the samples heated at 180°C than in the corresponding samples from the trials with frying periods due to the decrease in temperature when the frozen potatoes were immersed in the olive oil. The extra virgin olive oil showed more stability than the “olive oil”, due to the presence of higher concentrations of natural antioxidants which are removed during refining
Tipo de Documento
Dissertação de Mestrado
Idioma Português
Orientador(es) Ferreira-Dias, Suzana; Correia, Ana Cristina Vilas Boas
Idioma Português
Orientador(es) Ferreira-Dias, Suzana; Correia, Ana Cristina Vilas Boas
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||