Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/4127
Título: Implementação de um método para a determinação de hidrocarbonetos alifáticos saturados em óleo de girassol por cromatografia gasosa
Autor: Machado, Ana Catarina do Carmo Correia Rodrigues
Orientador: Mourato, Miguel Barbosa
Vasconcelos, Paula
Palavras-chave: saturated aliphatic hydrocarbons
mineral oil
sunflower oil
gas chromatography
Data de Defesa: 2011
Editora: ISA/UTL
Citação: Machado, Ana Catarina do Carmo Correia Rodrigues - Implementação de um método para a determinação de hidrocarbonetos alifáticos saturados em óleo de girassol por cromatografia gasosa. Lisboa: ISA, 2011
Resumo: Mineral oil is a by-product derived from petroleum distillation, applicable in the areas of cosmetics, pharmaceuticals and food, used as food additive when in the proper grade of purity for this propose. However, it can also be considered a contaminant, especially important in sunflower oil, due to the episode of the 100.000 tons of highly contaminated Ukrainian sunflower oil. This experimental work aims at implementing a method for the determination of saturated aliphatic hydrocarbons in sunflower oil by capillary gas chromatography with on column injection and FID detector. For such purpose parameters like linearity, working range, thresholds, precision, accuracy and robustness of the method were evaluated. The results show that the method is linear in the range between 15 and 60 mg.kg-1, with a repeatability limit of 6,11 mg.kg-1 and a variability of results obtained by this method of 0,48 mg.kg-1. The method allows to detect and quantify the analyte from 21 mg.kg-1 and 24 mg.kg-1, respectively. Considering the results obtained in recovery tests and Z-score of 0,5 and 0,04 obtained in inter-laboratory tests, the method is accurate. The robustness of this method is also verified, although it is sensible to the way the integration is performed
Descrição: Mestrado em Engenharia Alimentar - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/4127
Aparece nas colecções:BISA - Dissertações de Mestrado / Master Thesis

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