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Biomedical subjects

J Bartos

Publications and source records attributed to J Bartos.

At least 73 records · Page 4Linked to original sources
PubMed1980

[Testing the screening method for assaying ochratoxin in grains].

To detect ochratoxin in grains and some feed mixtures the method described by Nesheim et al. (1973) was chosen out of a large number of analytical procedures. No ochratoxin was assayed in any of 41 samples (barley, corn, wheat, oats, complete feed mixtures, degraded straw) which were obtained from the current operation of feed-processing plants, did not contain any macroscopically detectable molds, were taken from storehouses with safe store conditions and they were evaluated by agricultural enterprises as safe. This method can be recommended to assay grains for ochratoxin in Czechoslovakia.

Animal Feed↗
PubMed1979

[Determination of aflatoxins in cheeses].

To investigate cheeses for the presence of aflatoxins we chose the very sensitive method of Tuinstra and Bronsgeest (1975) used for the determination of aflatoxin M1 in milk. The method was slightly modified and the presence of aflatoxins was determined in 54 samples of different cheeses. Aflatoxin M1 was found out in 24% of the investigated samples. Most of positive samples were found among the soft cheeses (53.8 3/4), then in processed cheeses (13.6%) and in hard cheeses (12.5%). Aflatoxin M1 was not found in the group of mouldy cheeses and Olomouc cake cheeses, which were investigated in a smaller range. Positive findings did not exceed concentrations of 10 ng per kg, i.e. they did not even reach the value of permissible concentration as proposed in the Czech Socialist Republic for foods (5 microgram per kg).

Aflatoxins↗
PubMed1978

[Study on the possible presence of aflatoxin B 1 in liver and muscle tissue of slaughter animals].

Seventy-seven samples of liver (from pigs, bulls, cows, broiler chickens, layers), twenty-eight samples of white muscle (from pigs, broilers, layers), and twenty-four samples of red muscle (from pigs, broilers, layers) were examined by the modified Jacobson method (Jacobson et al. 1971) for the contingent presence of aflatoxin B1. The samples came from healthy animals, part of them from animals fed non-traditional feed containing pig excrements. Positive findings were only obtained in two samples of pork liver, out of the total number of 30 samples. One sample came from pigs fed a ration containing 5% of pig excrements, the other from a traditionally fed pig. The amounts of aflatoxin B1 found in these two samples can be treated as trace quantities, since the concentration did not exceed 0.1 microgram per kg. In the samples of muscle and liver of the other farm animals, the chromatogram did not show the presence of spots which might resemble, in colour and position, the spots of aflatoxin B1.

Aflatoxins↗
PubMed1978

[Selection of methods for the determination of aflatoxin presence in liquid milk].

Seven methods, recommended for determining aflatoxins in liquid milk, were tested. Most of them were variously modified, mainly for the unavailability of some chemicals needed. Samples of liquid milk, normally prepared for direct consumption, were taken from the retail market (bottled and plastic-sacheted milk, durable milk in speical boxes). The authors describe in detail the two methods now appearing to be the best for current screening tests of market samples of liquid milk. Seventy samples of market liquid milk were tested by these methods, and 25 of them were found to be positive. However, there was no sample to contain as much aflatoxin as determined in the proposed admissible concentration for food.

Aflatoxins↗
PubMed1977

[Examination of muscular and liver tissues of fish for the presence of aflatoxin B 1].

A method of the determination of aflatoxin B1 in the liver and muscular tissue of carp is described, enabling the capture of 50 ng in one kilogram. Extraction and purification were followed by thin-layer chromatography and by identification by means of ultraviolet light with simultaneous comparison with the standard. The examination was performed with 44 samples coming from healthy table carp from the Pohorelice farm of the State Fisheries National Corporation. None of the 44 the Pohorelice farm of the State Fisheries National Corporation. None of the 44 samples contained aflatoxin residues.

Aflatoxins↗
PubMed1977

[Selection of screening methods for the detection of aflatoxins in animal feed].

Five different screening methods of the detection of aflatoxin B1 are compared as to their usability in ten feeds, feed concentrates, and complete feed mixtures. Method II, i. e. the author's modification of the method of Pons et al. (1973) was found to be the best for the highest number of different feeds. Aflatoxin B1-positive findings were obtained in samples of groundnut cake and protein concentrates a) for laying hens and b) for breeding pigs. No aflatoxins were detected in other feed samples: soya, sunflower, maize, fish meal, complete feed mixtures--table trout trout feed, carp stock feed, table carp feed, duckling fattening mixture.

Aflatoxins↗