摘要:

A reverse isotope dilution procedure was used to measure the formation of sulphate ion during the air dehydration of sulphited cabbage, carrot and potato at 80°C. The conversion of sulphite to sulphate was found to be of first order with respect to sulphite. The formation of sulphate in the vegetables during dehydration accounts for only part of the sulphate in the dehydrated products; the remainder comes from the scald liquor. The technique for sulphate determination is critically evaluated and the observed yields discussed.

ISSN:0265-203X    

DOI:10.1080/02652039109374025

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Mineral hydrocarbons are used as processing aids at levels between 0.3 and 3% by weight in crystal polystyrene articles, the food contact uses of which include the dispensing of hot and cold beverages from automatic machines as well as in ‘fast‐food’ and catering establishments. The levels of migration of mineral hydrocarbons from polystyrene cups and glasses have been measured into aqueous food simulants as well as lager, beer, cola, sparkling apple juice, lemon barley water, coffee, hot chocolate, tea, lemon tea and chicken soup. For the cold beverages and simulants, no migration above 0.1 mg/kg was observed, and for the hot beverages and simulants no result greater than 0.5 mg/kg. Analysis was by capillary gas chromatography, using hydrocarbon internal standards calibrated against mineral hydrocarbon reference standards.

ISSN:0265-203X    

DOI:10.1080/02652039109374026

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

An investigation of residues of di‐(2‐ethylhexyl)‐phthalate (DEHP) in retail whole milk in samples from one German and 14 Danish dairies is reported. The investigation was performed about six months after the use of DEHP‐plasticized milk tubing was banned in Denmark. The results indicate a mean concentration of DEHP lower than 50 μg/litre in retail whole milk. Based on these data and the Tolerable Daily Intake (TDI) for DEHP of 25μg/kgbody weight laid down by the EEC Scientific Committee for Food, it is concluded that the intake of DEHP from milk and milk products does not, even through a whole life, constitute a danger to health for the Danish population.

ISSN:0265-203X    

DOI:10.1080/02652039109374027

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The occurrence of aflatoxins in market betel nut samples was studied. It was observed that several betel nut samples were infested with aflatoxin‐producing fungus,Aspergillus flavus.Out of 32 samples collected from various places, 12 were positive for aflatoxin. Aflatoxin B1was detected in all the positive samples. Other aflatoxins were also detected in some samples. Boric acid, propionic acid and potassium metabisulphite were used for the control of aflatoxin B1on betel nuts. Propionic acid was most effective in inhibiting aflatoxin production on betel nut after intervals of 2 (62%) and 4 (85%) weeks. Controlling the occurrence of aflatoxin could safeguard the users from the health hazards of aflatoxins.

ISSN:0265-203X    

DOI:10.1080/02652039109374028

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The role of harmane, aβ‐carboline formed during pyrolysis of tryptophan, on the metabolism of AFB1, growth and some parameters of the nutritional status was investigated in the rat. Male and female Wistar rats were fed a semi‐synthetic diet containing AFB1(2 ppm), harmane (250 ppm) or both compounds, for 33 days after weaning. Qualitative and quantitative differences in the urinary and faecal excretion of parental compound and metabolites were assessed by HPLC analysis.

ISSN:0265-203X    

DOI:10.1080/02652039109374029

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Chickpea seeds entering store carry a microflora of ‘field’ and ‘storage’ fungi. Field fungi gradually disappear and storage fungi then predominate. These fungi especiallyAspergillus flavus, A. niger, A. nidulans, A. ochraceusandPenicilliumspp. grow vigorously and initiate grain spoilage and aflatoxin elaboration. The shift in mycofloral spectrum was more rapid in seeds stored in jute bags than those stored in metal bins. Moisture content and aflatoxin contamination in seeds of jute bags was maximum during Sept.‐Oct. The internal environment of metal bins is comparatively less influenced by the external conditions and initially restricts fungal growth and aflatoxin elaboration. Prolonged storage however, increases seed moisture content and aflatoxin is increased in chickpea seeds after six months storage in metal bins.

ISSN:0265-203X    

DOI:10.1080/02652039109374030

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The effects ofaw(0.90, 0.95, 0.98) and temperature (25°C, 30°C, 35°C) on aflatoxin production byAspergillus flavusandAspergillus parasiticusgrowing on irradiated maize seeds, were examined. Highest levels of aflatoxin were produced byA. parasitiousat 25°C and 0.98awand byA. flavusat 30°C at 0.95 and 0.98aw. At 0.90awtoxin production was consistently low for both species at all temperatures. Temperature cycling ofA. flavusbetween 25°C and 35°C each for 12 h resulted in higher aflatoxin synthesis than when incubated either at 25°C or 35°C.

ISSN:0265-203X    

DOI:10.1080/02652039109374031

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

During surveillance of hog carcasses from Manitoba for antibiotic residues by the Health of Animals Laboratory, Agriculture Canada, Saskatoon, an unknown substance was found which produced tetracycline‐like results with the methods used. This same substance was found in an implicated swine feed premix. Using various HPLC systems and columns, UV spectroscopy, reverse‐phase TLC, and mass spectrometry, the substance was isolated from the feed premix, and identified as lumichrome, a photodegradation product of riboflavin. Traces of the same substance were found in riboflavin standard. Analysis of swine kidney, previously found to contain the unknown, showed the same substance was present at a level of about 1 ppm.

ISSN:0265-203X    

DOI:10.1080/02652039109374032

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Forty‐four brands of milk powders and simulated milk powders were analysed for aluminium content using Inductively Coupled Plasma Spectroscopy (ICP‐OES) technique. The samples covered the full range of infant food items available in Singapore—full‐cream milk formula, infant formula, fortified infant formula and milk‐free soy protein formula.

ISSN:0265-203X    

DOI:10.1080/02652039109374033

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Toxic epidemics have become a serious problem during the twentieth century, due mainly to the huge expansion over the last 50 years of the chemical industry, which has placed tens of thousands of new synthetic organic compounds in the human environment.

ISSN:0265-203X    

DOI:10.1080/02652039109374034

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor