[The dose-dependent effects of a combination of different classes of antioxidants exemplified by dibunol and beta-carotene]. / Dozozavisimye éffekty kombinatsii antioksidantov raznykh klassov na primere dibunola i beta-karotina.

In order to enhance antioxidant protection of the organism in various pathological states, effective combinations of antioxidants have been developed that interact with various types of free radicals. On two experimental models,--acute alcohol intoxication and calcium chloride arrhythmia of rats, the prophylactic activity of antioxidant combinations was established for certain doses, rather then for monotherapy. The possibility of obtaining high protective effects at relatively low concentrations of the components in the complex preparation was shown. Am increase of antioxidant concentration in the preparation could decrease its efficiency. The highest efficiency in the complex preparations, as compared with in each component taken separately, was observed in the case of calcium chloride arrhythmia when dibunol and beta-carotene were combined at concentrations of 10 mg/kg and in the case of acute alcohol intoxication (1 and 0.25 mg/kg, respectively). Enhanced efficiency of combined antioxidant therapy opens up the way to the production of new active complex preparations with minimum toxic side toxic effects and complications.

[Formation of peroxide compounds and their role in the inactivation of polyene antibiotics levorin and mycoheptin]. / Obrazovanie perekisnykh soedinenii i ikh rol' v inaktivatsii polienovykh antibiotikov levorina i mikogeptina.

The kinetics of peroxide formation in the process of levorin and mycoheptin oxidation at a temperature of 57 degrees C was studied. It was shown that the peroxide compounds actively participated in the processes of levorin and mycoheptin inactivation as intermediate products of their transformation. Addition of the peroxides increased the rate of the antibiotic degradation even if there was no oxygen and subsequently decreased the periods of their storage. Conditions for the use of the iodometric method for determination of the peroxides in the poyenic compounds are discussed.