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Abstract(s)
A realização desta tese tinha como principal objectivo determinar a concentração de
cobre, cobalto e molibdénio em alimentos seleccionados.
Foram determinadas as concentrações de cobre, cobalto e molibdénio em feijões
vermelho, feijões castanho, feijões branco, dois tipos de amêndoas, dois tipos de nozes e
amendoins. Todos estes alimentos foram comprados e analisados na República Checa.
Para a análise destes alimentos foi usado o método analítico Espectrometria de Massa
Acoplada a Plasma Indutivo (ICP-MS). Antes de efectuar a análise foi necessário fazer um
tratamento prévio que consistia na digestão do alimento no microondas, utilizando-se uma
massa de 1 grama de alimento, 5 ml de HNO3 e 2 ml de H2O2. O alimento que tem maior
concentração de cobre é as nozes fornecida pela empresa Fit Line (8,7 ± 0,6 μg/g) e o que
tem a menor concentração de cobre são os amendoins (3,2 ± 0,2 μg/g). Em relação ao
cobalto o alimento que tem a maior concentração de cobalto é feijão do tipo castanho (0,106
± 0,005 μg/g) e o que apresenta a menor concentração é as amêndoas do tipo 2 (0,019 ±
0,003 μg/g). Para o molibdénio o alimento que apresenta uma maior concentração é o feijão
do tipo branco (5,3 ± 0,6 μg/g) e o que tem a menor concentração é as nozes do tipo 2 (0,10
± 0,01 μg/g).
The main objective of this thesis was to determine the concentration, of copper, cobalt and molybdenum found in selected foods. The amount of copper, cobalt and molybdenum present in dry red beans, brown beans, white beans, two types of almonds, two types of walnuts and also in peanuts was determined. All of these foods were analyzed in the Czech Republic. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was used to analyze these foods. Before the analysis, inset it was necessary to do a preliminary treatment, which consisted in dissolving the solid food in the microwave, using 1 g of food, 5 mL of HNO3 and 2 mL of H2O2. The conclusions were that the foods which have the highest concentration of copper were the walnuts, supplied by the Fit Line Company (8,7 ± 0,6 μg/g), whereas the food which contained the lowest concentration of copper were the peanuts (3,2 ± 0,2 μg/g). As for the cobalt, the food with the highest concentration of this element was the brown beans (0,106 ± 0,005 μg/g), and the food that had the lowest concentration was the almonds type 2 (0,019 ± 0,003 μg/g). Therefore, the dried white beans revealed to be the food with the highest amount of molybdenum (5,3 ± 0,6 μg/g), and the type 2 walnuts, have the lowest (0,10 ± 0,01 μg/g) amount of this element.
The main objective of this thesis was to determine the concentration, of copper, cobalt and molybdenum found in selected foods. The amount of copper, cobalt and molybdenum present in dry red beans, brown beans, white beans, two types of almonds, two types of walnuts and also in peanuts was determined. All of these foods were analyzed in the Czech Republic. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was used to analyze these foods. Before the analysis, inset it was necessary to do a preliminary treatment, which consisted in dissolving the solid food in the microwave, using 1 g of food, 5 mL of HNO3 and 2 mL of H2O2. The conclusions were that the foods which have the highest concentration of copper were the walnuts, supplied by the Fit Line Company (8,7 ± 0,6 μg/g), whereas the food which contained the lowest concentration of copper were the peanuts (3,2 ± 0,2 μg/g). As for the cobalt, the food with the highest concentration of this element was the brown beans (0,106 ± 0,005 μg/g), and the food that had the lowest concentration was the almonds type 2 (0,019 ± 0,003 μg/g). Therefore, the dried white beans revealed to be the food with the highest amount of molybdenum (5,3 ± 0,6 μg/g), and the type 2 walnuts, have the lowest (0,10 ± 0,01 μg/g) amount of this element.
Description
Keywords
ICP-MS Oligoelementos Cobre Cobalto Molibdénio Feijões Nozes Amêndoas Amendoins Trace elements Copper Cobalt Molybdenum Beans Almonds walnuts Peanuts
Citation
Publisher
Instituto Politécnico do Porto. Instituto Superior de Engenharia do Porto