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1.
Shokuhin Eiseigaku Zasshi ; 46(4): 133-8, 2005 Aug.
Artigo em Japonês | MEDLINE | ID: mdl-16180682

RESUMO

Migration from multi-layer laminated film pouches intended for retort foods was investigated through HPLC analysis with a fluorescence detector, and measurements of residue on evaporation, consumption of potassium permanganate and total organic carbon. HPLC analysis revealed that the levels of migrants in oil and the water which were heated in the pouches (121 degrees C, 30 min) were ten times of those in the corresponding official simulants under the official conditions; n-heptane (25 degrees C, 60 min), and water (95 degrees C, 30 min). Bisphenol A diglycidyl ether and related compounds were found in the oil and the water heated in the pouches, as well as in the simulants. These compounds were thought to have been present in the adhesive between the laminated films, and migrated through the food-contact film of the package. Consumption of potassium permanganate and residue on evaporation of the heated water were ten times of those of the water simulant, while the total organic carbon level of the heated water was several-hold greater than that of the water simulant. In addition, migrant levels per surface area of the pouch were one-fourth of the concentrations per content volume of the pouch. Since compliance with the legal limits is evaluated based on the concentration per surface area, real migration into foods would be underestimated by a factor of another four.


Assuntos
Compostos de Epóxi/análise , Análise de Alimentos/métodos , Embalagem de Alimentos , Conservação de Alimentos , Compostos Benzidrílicos , Cromatografia Líquida de Alta Pressão/métodos
2.
Shokuhin Eiseigaku Zasshi ; 45(1): 29-34, 2004 Feb.
Artigo em Japonês | MEDLINE | ID: mdl-15168558

RESUMO

The effect of coexisting metals in a sample on the determination of lead and cadmium in plastics used for food contact materials was investigated. In the official method specified in the Japanese Food Sanitation Law, contents of lead and cadmium are determined by a dry incineration method using sulfuric acid. It was assumed that sometimes, coexisting metals in a sample may form insoluble sulfate and that lead sulfate might be adsorbed into the insoluble sulfate. Therefore, hydrochloric acid was added to the ash, to turn formed insoluble sulfate into soluble compounds (HCl addition method). We found that recoveries of cadmium were not affected in the presence of other metals except when calcium exceeded 20 mg/g in both methods. Recoveries of lead decreased in the presence of barium exceeding 0.1 mg/g or calcium exceeding 10 mg/g in the official method. However, improvement of recoveries was achieved with the HCl addition method and by reducing the sample amount to one-tenth (0.1 g) of that specified in the official method.


Assuntos
Cádmio/análise , Embalagem de Alimentos/legislação & jurisprudência , Chumbo/análise , Metais/análise , Plásticos/análise , Bário/análise , Cálcio/análise , Japão
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