Angel Iliev, Boryana Brashlyanova


The aim of this study is to investigate changes in the content of biologically active substances, antioxidant activity, and the ability to absorb the toxic metals As, Cd and Pb, during storage in refrigerated condition of different fractions onion and garlic. Study included fresh onion and garlic, divided to leaf (green) and underground (white) faction, and mature onion bulbs yellow and red types. It was found a gradual decrease in the content of phenolic substances, with particularly high rate of degradation of anthocyanin in red type of onion. Dynamics antioxidant activity showed noticeable changes in different directions at different aspects of antioxidant activity: Radical scavenging ability, and the ability to inhibit lipid oxidation in some fractions, show a slight increase for the duration of storage, while reducing, and chelating ability, and absorption of heavy metals show a gradual decrease.

Key words: antioxidant activity, biologically active substances, absorption of toxic metals, onion, garlic, cold storage

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