The purpose of this study was to evaluate the levels of Al, Ca, Cu, Fe, Mg, Mn, Na, Pb and Zn in 15 samples of five fish species (Brachyplatystoma rousseauxii, Brachyplatystoma filamentosum, Cynoscion leiarchus, Brachyplatystoma vaillanti e Colossoma macropomum) obtained in municipal market of Belém (Pará State, Brazil). These samples were digested in a cavity microwave oven using a 3.5 mol L-1 nitric acid solution and concentrated hydrogen peroxide. Total concentrations of the studied elements were determined by flame atomic absorption spectrometry (FAAS) and graphite furnace atomic absorption spectrometry (GF AAS). The contents of the elements in fish samples ranged from 90.

O uso de plantas medicinais é uma prática comum no país, a qual tem sido transmitida de geração em geração e é realizada por meio do extrativismo. A utilização e comercialização de plantas medicinais têm sido estimuladas pela crescente demanda da indústria por novas fontes naturais de medicamentos e, por outro lado, devido aos efeitos colaterais causados pelos fármacos sintéticos que estimulam o aproveitamento de medicamentos de origem vegetal ou, em muitos casos, porque representam a única fonte de medicamentos, especialmente nos lugares mais isolados e distantes, e como resposta aos problemas imediatos de saúde (VEIGA JÚNIOR;PINTO;MACIEL, 2005).A Organização Mundial da Saúde estima que 80% da população mundial depende da medicina tradicional para suas necessidades básicas de saúde e que quase 85% da medicina tradicional envolve o uso de plantas medicinais, seus extratos vegetais e seus princípios ativos (AKERELE, 1993).Alguns nutrientes minerais presentes em plantas possuem um papel preventivo no combate de doenças, mas é importante ressaltar que níveis elevados desses minerais podem ser perigosos e tóxicos ao organismo. Alguns minerais como Co, Cr, Cu, Fe, Mn, Mg, Mo, Se e Zn são considerados essenciais à saúde por atuarem em importantes vias metabólicas, participando de Tris-HCl buffer (pH 8.0) containing 1% (m/v) sodium dodecylsulfate (SDS), 0.05 mol.L -1 HCl, and hot water at 60 °C. The peel and leaves of Caesalpinia ferrea Martius presented higher levels of iron and manganese when compared to other medicinal plants. The elements studied showed predominant association with compounds of high and low molecular weight and soluble and insoluble species in water. Among the analyzed elements, the iron presented the best bioavailability in the peel and leaves of the fruit. Manganese and zinc presented higher bioavailability in the leaves. The peel and leaves of Caesalpinia ferrea Martius can be an alternative source of iron, manganese, and zinc in the alimentary diet. Keywords: iron; manganese; zinc; bioavailability; Caesalpinia ferrea Martius. ResumoAs plantas medicinais podem ser usadas como fontes alternativas de nutrientes minerais na dieta alimentar. Elementos como ferro, manganês e zinco apresentam biodisponibilidade variável em função de suas formas químicas (espécies) presentes em um alimento. Este trabalho tem como objetivo avaliar o teor e a biodisponibilidade de ferro, manganês e zinco em extratos da casca do fruto e das folhas

Resumo:The concentrations of Ca, Cu, Fe, K, Mg, Mn, P and Zn in 10 commercially available cassava flours (Manihot esculenta Crantz, Euphorbiaceae) were determined using inductively coupled plasma optical emission spectrometry (ICP OES). The elements were found in descending order of concentration, as K > Ca > P > Mg > Fe > Cu > Zn > Mn. Based on the recommended daily intake for adults, the values showed that 10 g day -1 cassava flour provides 5.3% of the daily intake of Cu, 0,5-1.2% for Fe, 0.5% for Ca, 0.9-1.2% for Mg, 0.6-0,8% for Mn, 0.6% for P, 0.2% for K and 0.2-0.3% for Zn. Based on the RDIs (Recommended Daily Intake) of the elements studied, the results indicate that cassava flour contains several essential elements, and the levels found in the cassava flours presents no risk to the human health. With the results of the multivariate analysis, it was possible to locate information about clusters and dissimilarities between the samples and between the variables, as well as to provide useful information for future studies on quality control and genetic improvement of cassava with better nutritional values. Palavras-chave:Manihot esculenta Crantz, Alimento, Elementos-traço, ICP OES, RDI. AbstractThe concentrations of Ca, Cu, Fe, K, Mg, Mn, P and Zn in 10 commercially available cassava flours (Manihot esculenta Crantz, Euphorbiaceae) were determined using inductively coupled plasma optical emission spectrometry (ICP OES). The elements were found in descending order of concentration, as K > Ca > P > Mg > Fe > Cu > Zn > Mn. Based on the recommended daily intake for adults, the values showed that 10 g day -1cassava flour provides 5.3% of the daily intake of Cu, 0,5-1.2% for Fe, 0.5% for Ca, 0.9-1.2% for Mg, 0.6-0,8% for Mn, 0.6% for P, 0.2% for K and 0.2-0.3% for Zn. Based on the RDIs (Recommended Daily Intake) of the elements studied, the results indicate that cassava flour contains several essential elements, and the levels found in the cassava flours presents no risk to the human health. With the results of the multivariate analysis, it was possible to locate information about clusters and dissimilarities between the samples and between the variables, as well as to provide useful information for future studies on quality control and genetic improvement of cassava with better nutritional values.

ResumoNeste estudo, cromatografia de exclusão por tamanho (SEC) com detecção por UV e detecção off-line por espectrometria de absorção atômica em forno de grafite (GF AAS) foi usada para investigar a associação de cobre a espécies de alta massa molecular (HMW) e baixa massa molecular (LMW) presentes na polpa de açaí (Euterpe oleracea Mart.). A concentração total de cobre obtida nos digeridos da polpa de açaí foi 10,5 µg g -1. Cobre foi encontrado associado às frações de HMW e LMW, correspondentes às massas moleculares de 28,7, 2,6 e 0,43 kDa. PalavRas-chave: metal, SEC, GF AAS, proteínas, Euterpe oleracea Mart. Evaluation of the distribution of copper associated to compounds of different molecular weights in the acai pulp abstRactIn this study, size exclusion chromatography (SEC) with ultraviolet (UV) and graphite furnace atomic absorption spectrometry (GF AAS) off-line detection was used to investigate the association of copper to high molecular weight (HMW) and low molecular weight (LMW) species present in Euterpe oleracea Mart. pulp. Total concentration of copper was 10.5 µg g -1 .Copper was found to be associated to fractions corresponding to 28.7, 2.6 and 0.43 kDa.

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