A study was made in diets offered to a group of pre-school children,whose mean age was 67 months and remained the whole day in three day carecenters from Juiz de Fora, M.G., Brazil. For sampling, the duplicate portiontechnique was used, and the diets were collected and analyzed separately eachday in the 3 nurseries. Instrumental neutron activation analysis was appliedto the determination of 16 elements. The daily dietary intake values werecompared to the RDA (children 4–6 years old). Based on this reference,Ca, Fe, Se and Zn were found to be deficient, Mg and Mn were comparable tothe RDA and the Cl and Na concentrations were higher compared to their RDA.For the other elements measured, there are no RDA's for children.
Authors:D. Fávaro, V. Maihara, M. Armelin, M. Vasconcellos, and S. Cozzolino
The present paper describes radiochemical separation procedures developed for the determination of seven elements: As, Cd, Cr, Cu, Hg, Sb and Se in different Brazilian regional diets. In the case of the elements As, Hg, Sb and Se, the procedure was based on retention in inorganic exchanger TDO (tin dioxide) and determination of Hg by extraction with Ni(DDC)2. For determination of Cd, Cr, Cu and Se the procedure chosen was based on retention in inorganic exchanger HMD (hydrated managese dioxide) and extraction of Cu and Cd as diethyldithiocarbamate compounds. The accuracy and precision of the methods studied were tested by means of analyses of different reference materials. Due to the lack of data on trace element levels in Brazilian foodstuffs and diets, these methods were applied to determination of these elements in different Brazilian regional diets. These diets were supplied by the Food and Experimental Nutrition Department of the Faculty of Pharmaceutical Science, University of São Paulo. The daily dietary intake values for these diets are presented for As, Cd, Cr, Cu, Hg, Sb and Se.
Authors:D. Fávaro, V. Maihara, D. Mafra, S. Souza, M. Vasconcellos, M. Cordeiro, and S. Cozzolino
In the present work, the concentration of the 14 elements Br, Ca, Cl, Co, Cs, Fe, K, Mn, Na, Rb, Sc Se and Zn have been determined by INAA in diets of four different groups: (a) 19 pre-school children, (b) 18 healthy adults, (c) 23 elderly people living in private institutions and (d) 19 patients with chronic renal failure (CRF). The contents of proteins, lipids and carbohydrates were also analysed in the diets. The daily intakes of the elements analysed were compared to the recommended values set by RDA or WHO.
Authors:V. Maihara, I. Gonzaga, V. Silva, D. Fávaro, M. Vasconcellos, and S. Cozzolino
Due to its essential characteristics, the daily dietary selenium intake of individuals should be monitored accurately. In
the current work, daily selenium intake of different Brazilian population groups based on duplicate portion diet analysis
was evaluated and compared with the new estimated average requirement values (EAR), to assess if selenium deficiency or excess
could be observed in these groups. Selenium content was determined by neutron activation analysis (NAA). The average daily
dietary selenium intake found was 26.3 (±8.3) ·g/day for children from the city of São Paulo, 37.4 (±16.0) ·g/day for children
from Belém, 107 (±107) ·g/day for children from Macapá, 28.4 (±7.5) ·g/day for institutionalized elderly, 32 (±6) ·g/day for
non-institutionalized elderly and 37 (±17) ·g/day for university students from São Paulo. Most daily dietary selenium intake
range observed were below the EAR values. The values obtained for children groups from Belém and Macapá cities, whose intake
levels were much higher than the recommendation, were an exception.