ANTIOXIDANT PROPERTIES OF EXTRACTIVE SUBSTANCES OF DESTRUCTION PRODUCTS OF BARK-WOOD WASTE OF LONG SHELF LIFE
UDK 676.08:67.08:577.19
Abstract
The antioxidant activity of ethyl acetate and hexane extracts of the products of the destruction of bark-wood waste (BWW) from the bark dump of Syktyvkar LDK OJSC, located in the Forestry district of Syktyvkar, was investigated. It was found that the total content of phenolic compounds in them was quite high and varied from 46 to 74 mg (GAE) /g of dry extract. However, the results of determining the ability of the studied substances from BWW to bind DPH radicals and chelate Fe2+ ions did not reveal either radical-binding or significant iron-chelating activity. It was shown that the extracts had an inhibitory effect on the specific growth rate of Escherichia coli, and also stimulated the expression of the katG gene. It was found that the strength of the response to oxidative stress in the presence of the tested extracts, i.e. their ability to exert an antioxidant effect, depended on the time at which the oxidant was added. The short time interval between incubation with extracts and the addition of peroxide led to an additive effect, as a result of which the oxidative effect on bacterial cultures was enhanced. A longer incubation with extracts before the addition of peroxide, on the contrary, provided stimulation of the antioxidant gene katG, which ultimately contributed to protection from the action of peroxide.
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