The antioxidant properties of humic substances of low-mineralization sulfidic muds (peloids) were investigated using initiated oxidation of 1,4-dioxane as a model reaction. Four groups of substances including humic, himatomelanic, fulvic, and humus acids were studied. Kinetic characteristics of the oxidation of humic substances were determined in terms of effective inhibition rate constants fk In . It is established that himatomelanic acids of peloids exhibit the maximum antioxidant activity among the studied substances.

The effect of individual components of humic substances of peloid on free radical oxidation processes has been investigated under conditions of oxidative stress induced in albino rats. Biological activity of peloids was determined using such parameters as the general antioxidant activity, activity superoxide dismutases, catalases and glutathione peroxidases on the third and tenth day of the experiment. Results indicate that the state of oxidative stress can be corrected on the third day of the experiment. Humic acids restore not only normal physiological redox systems, but also increase the activity of antioxidant enzymes on the 10th day.

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BACKGROUND Chronic urticaria (CU) is a common and not lifethreatening skin disease. Emotional distress is widely thought to cause, drive and/or maintain CU. The objective of this study was to investigate the presence of anxiety, depression, and stress in adult patients with CU and to explore potential impact on urticaria treatment.