title: [Reduction of radiation-induced vitamin E- and B1- losses by irradiation of foodstuffs at low temperature and by exclusion of atmospheric oxygen].
abstract: The protective effect of low temperatures during irradiation on vitamin B1 and E levels in foods is not abolished by subsequent storage or heating. Egg powder irradiated at 1 Mrad in the presence of air and stored for 4 months at ambient temperature lost 68% of its thiamin content when irradiated at 20 degrees C, 33% when irradiated at -30 degrees C. Sunflower oil irradiated at 3 Mrad in the presence of air and subsequently heated for 1 hour at 180 degrees C lost 98% of its alpha-tocopherol content when irradiated at 20 degrees C, 65% when irradiated at -30 degrees C. Exclusion of atmospheric oxygen by packaging under nitrogen reduced the loss of alpha-tocopherol in irradiated (0.1 Mrad) rolled oats after 8 months of storage from 56 to 5% and the loss of thiamin from 86 to 26%. Vacuum packaging was equally effective during the first 3 months and somewhat less effective during the following 5 months. Packaging under carbon dioxide showed no advantage over packaging in air. Sensory evaluation of rolled oats, raw or cooked, 1 and 3 months after irradiation with 0.1 Mrad indicated no significant quality difference between unirradiated and irradiated samples packaged under nitrogen.
mesh_terms: D000693:Anaerobiosis; D004355:Drug Stability; D005514:Food Irradiation; D005615:Freezing; D010100:Oxygen; D013831:Thiamine / Q000032:analysis / Q000528:radiation effects*; D014810:Vitamin E / Q000032:analysis / Q000528:radiation effects*
chemical_list: D014810:Vitamin E; D010100:Oxygen; D013831:Thiamine
vernacular_title: Verminderung von strahleninduzierten Vitamin-E- und -B1-Verlusten durch Bestrahlung von Lebensmitteln bei tiefen Temperaturen und durch Ausschluss von Luftsauerstaff.