RESUMO
Objective. Street-vended foods offer numerous advantages to food security; nevertheless, the safety of street food should be considered. This study has investigated the level of potential toxic metal (Pb, Cd, Hg, Sb, Mn, and Al) contamination among street-vended foods in Benin City and Umunede. Methods. Twenty street food samples were purchased from vendors at bus stops. Metals were analyzed with atomic absorption spectrophotometry. The methods developed by the US EPA were employed to evaluate the potential health risk of toxic metals. Results. The concentrations of the toxic metals in mg/kg were in the range of Pb (0.014-1.37), Cd (0.00-0.00017), Hg (0.00-0.00014), Sb (0.00-0.021), Mn (0.00-0.012), and Al (0.00-0.22). All the toxic metals except Pb were below permissible limit set by WHO, EU, and USEPA. The daily intake, hazard quotient, and hazard index of all toxic metals except for Pb in some street foods were below the tolerable daily intake and threshold value of 1, indicating an insignificant health risk. Total cancer risk was within the priority risk level of 1.0E - 04 but higher than the acceptable risk level of 1E - 06. Conclusion. Consumption of some of these street foods is of public health concern.
Assuntos
Dieta , Exposição Ambiental , Contaminação de Alimentos/análise , Metais Pesados/análise , Neoplasias/epidemiologia , Cidades , Monitoramento Ambiental , Humanos , Neoplasias/etiologia , Nigéria/epidemiologia , Medição de RiscoRESUMO
Chromolaena odorata, a commonly used traditional remedy for different ailments, believed to be quite safe in terms of toxicity was evaluated for acute toxicity and cytotoxic potentials. Acute toxicity was done on albino Wistar rats using the Lorke method while brine shrimps were used to test for cytotoxicity. The results showed that the estimated LD50 for the aqueous and ethanolic extracts was 2154 and > 5000 mg kg(-1) body weight, respectively. Cytotoxicity to brine shrimps showed LC50 values of 324 and 392 ppm for aqueous and ethanolic extracts, respectively. These results indicate the relative non toxic nature of Chromolaena odorata extracts.
