摘要:

A study was made of the effect on the concentration of lead in canned fruits and juices when these food products are stored in their original containers after opening. Samples stored in a refrigerator were analyzed for lead upon initial opening, 2 days after opening, and 5 days after opening. Products in nonlacquered cans showed significant increases in lead concentration with time. The increase of lead in the food product could have an effect on estimates of average dietary intakes of lead if this practice is found to be widespread.

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1978.tb00278.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

A study was carried out to determine if the presence of ascorbic acid interferes with the colorimetric determination of nitrite by the technique of separate addition of color reagents. It was shown that ascorbate can destroy some of the nitrite during pre‐incubation with sulfanilamide, one of the color reagents used to form the diazo compound. An alternative method of analysis is suggested in which ascorbic acid, in the concentration range normally found in foods and cured meat products, does not interfer

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1978.tb00279.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

The distribution, absorption, metabolism and tissue binding of radioactivity were studied in hamsters after oral and intraperitoneal administration of α‐chaconine‐(3H). The material was well absorbed from the gastrointestinal tract and nearly 25% of the label was excreted in 7 days via urine and feces. The excretion was higher in urine (24%) than in feces (1%). Tissue concentrations of radioactivity peaked at 12 h following po administration, with the highest concentrations being in lungs, liver, spleen, skeletal muscle, kidney and pancreas, with heart and brain containing moderate amounts. Excretion of chloroform‐soluble products in the feces was 100 higher than that of chloroform‐insoluble metabolites after oral and ip administration. In urine, the activity was predominantly in the chloroform‐insoluble form and the chloroform‐soluble metabolites were relatively small in amounts (0.29, 0.85 and 2.45% versus 0.0, 0.14 and 0.19 for 12, 24 and 72 h, respectively). After 7 days, the chloroform‐soluble metabolites in urine increased to 20% of the excreted radioactivity, while the amount of chloroform‐insoluble metabolites was less than 1%. Subcellular distribution of the labeled compound indicated the highest concentration of radioactivity in the nuclear and microsomal fractions of brain, liver, and heart tissues. Binding of radioactivity was observed in brain, testes, kidney, lung, liver and heart. All of the label in brain appeared to be in bound form. The results indicated that α‐chaconine which is absorbed from the gastrointestinal tract after oral administration persists in various tissues, much of it in bound (nonextractable) form (in m

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1978.tb00280.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1978.tb00281.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

Methylhydrazine, the main metabolite of N‐methyl‐N‐formylhydra‐zones, was detected in the cooking steam of the mushrooms False morels, Gyromitra esculenta. About 25% of the original amount of acetaldehyde‐N‐methyl‐N‐formylhydrazone was decomposed during cooking process to methylhydrazine and residues of N‐methyl‐N‐formylhydrazine

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1978.tb00282.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1978.tb00283.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY