Mineral content, total phenolic compounds (TPC), and antioxidant capacity were determined in three samples of purple-ac ¸aı ´(coarse-PAC, medium-PAM, and fine-PAF), and one of white-ac ¸aı ´(coarse-WAC) and their respective bioaccessible fractions. TPC content differed in all samples, with PAC (583.79 mgAGE/100 g) having the highest content; however, PAM showed higher bioaccessibility (32.27%). PAC presented higher antioxidant capacity in the FRAP tests (74.34 lM FeSO 4 /g) and ABTS (55.05 lM Trolox/g). However, no differences were found in DPPH between PAC (1986.66 EC50) and PAM (2408.88 EC50) samples. Antioxidant capacity was decreased in all samples after digestion. Potassium was in the highest proportion (7121.90 mg/100 g-PAC), followed by Ca (349.92 mg/100 g-PAM), and Mg (169.41 mg/100 g-PAM), in all the samples. However, Ca presented the highest bioaccessible fraction, followed by Mg and Mn, with the highest percentages observed in WAC samples (90.30, 74.30, and 64.52%, respectively).
The objective of this study was to evaluate the differences in composition among six brands of conventional soybean and six genetically modified cultivars (GM). We focused on the isoflavones profile and mineral content questioning the substantial equivalence between conventional and GM organisms. The statement of compliance label for conventional grains was verified for the presence of genetic modified genes by real time polymerase chain reaction (PCR). We did not detect the presence of the 35S promoter in commercial samples, indicating the absence of transgene insertion. For mineral analysis, we used the method of inductively coupled plasma-optical emission spectrometry (ICP-OES). Isoflavones quantification was performed by high performance liquid chromatography (HPLC). The results showed no statistical difference between the conventional and transgenic soybean groups concerning isoflavone content and mineral composition. The concentration of potassium, the main mineral component of soy, was the highest in conventional soybeans compared to that in GM soy, while GM samples presented the highest concentra-* Corresponding author.G. R. Costa et al. 2052 tions of iron.
O objetivo do trabalho foi analisar o teor de mercúrio em peixes comercializados em Minas Gerais, coletados pelo Programa de Monitoramento de Alimentos da Vigilância Sanitária de Minas Gerais - PROGVISA, e verificar com base nesses valores o risco do consumo de peixes. Foi analisado o teor de mercúrio total em 80 amostras de peixes coletadas de forma aleatória no mercado de Minas Gerais. As análises foram feitas por espectrofotometria de absorção atômica após amalgamação em ouro. A partir desses valores foi estimada a ingestão de metilmercúrio em Minas Gerais e esta estimativa foi comparada com parâmetros toxicológicos de referência. Dentre as amostras, 38,8% eram de peixes não predadores e 61,2% eram de peixes predadores. Os resultados indicaram que os teores de mercúrio encontrados na maioria das amostras de peixes de Minas Gerais foram inferiores aos limites máximos permitidos pela legislação brasileira. Somente 8,2% das amostras de peixes predadores apresentaram resultados insatisfatórios (teores >1,0 mg/kg), sendo somente o peixe cação. Em geral, peixes não predadores e peixes usualmente de aquicultura, como tilápia, panga e salmão, apresentaram teores de mercúrio baixos. A ingestão de mercúrio estimada para a população de Minas Gerais foi considerada aceitável, sem risco apreciável à saúde. O consumo de peixes seguindo a recomendação de duas a três porções semanais, desde que não se inclua peixes do topo da cadeia alimentar, parece ser seguro. Os resultados indicam que teores de mercúrio abaixo dos limites estabelecidos pela legislação brasileira são importantes para garantir ingestões desse contaminante em níveis seguros.
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