Results 1 - 10 of 744
Results 1 - 10 of 744. Search took: 0.044 seconds
|Sort by: date | relevance|
[en] Oyster-mushrooms (Pleurotus ostreatus and florida) were grown on straw either sterilized by steam or γ-irradiation. Concerning the yield of receptacle (270 g receptacle per kg dried straw on average) and the dry substance of mushrooms (8%) no differences could be found. By swisstasting no differences in colour, smell, taste or consistence could be detected as to mushrooms grown on substrate sterilized by steam or γ-irradiation, respectively. Oyster-mushrooms and champignons were dished up (''gulyas'', ''salad'' or ''fried'') and 90% of the test persons preferred oyster-mushrooms. (author)
[en] Complete text of publication follows. In contrast to thermally processed foods, irradiation is a cold treatment both to reduce microbiological contamination and to increase the shelf-life of raw seafood. According to the list of States' authorizations molluscs can be irradiated in a range of 0.5 / 3 kGy only in authorized countries (e.g. UK, Belgium and Czech Republic). Therefore the aim of this study is to identify, at different dose levels (0.5, 1, 1.5, 2, 3 kGy), irradiated oysters, clams and mussels using luminescence materials from different sites (shells and pulps) and to determine sample sensitivity for previous screening result confirmation. A total number of 10 samples for each species were analyzed by both procedures: screening and calibrated PSL. Samples were irradiated using a low energy X-ray irradiator (RS-2400, Radsource Inc.) with the following operational settings: 150 kV and 45 mA. Whole pulps were simply dispensed into a clean Petri-dish whereas shells powder required to be fixed as a thick layer with silicone grease. Results obtained showed that screening analysis can be used to identify correctly all irradiated and non irradiated samples. Particularly untreated sample exhibited a sensitivity index from 2 to 4 order of magnitude greater than the exposed sample one, while for exposed specimen calibrated PSL signals, after re-irradiation at defined dose, were of the same order of the first measurement (initial PSL counts). In conclusion mineral debris contaminating pulps and biocarbonates from shells can be considered reliable radioinduced markers and PSL techniques can be easily applied for rapid and simple analysis to identify irradiated molluscs in official controls.