Introduction: According to literature, free radicals cause many diseases. A great interest in antioxidantsis observed, especially their nature and origin. The use of synthetic ones must be limited due to their sideeffects.Objective: The aim of the study was to determine the antioxidant activity of red raspberry shoots liquidextracts.Methods: Using spectrophotometric and alkalimetric methods of analysis, the main biologically activesubstances (BAS) in the six obtained red raspberry shoots liquid extracts, were quantified. The potentiometricmethod was applied to assess antioxidant effect.Results: Results demonstrate a high amount of phenolic compounds and catechins in aqueous extract. Theywere 23.200.46 and 20.000.40 mg/ml, respectively. The flavonoids and hydroxycinnamic acids dominatedin 80% extract (1.000.40 and 3.94 mg/ml, respectively). The greatest level of organic acids was found in 20%extract (3.150.06 mg/ml). The aqueous extract of red raspberry shoots possessed the highest antioxidantproperties. Thus, water is the most appropriate solvent for extracting biologically active compounds.Conclusions: The aqueous extract possessed the highest value of antioxidant activity. The greatest content ofpolyphenols and catechins has been found in the aqueous extract. The correlation was observed between thehighest amount of antioxidant activity of hydroxycinnamic acid derivatives and the lowest in organic acids.
Maslov et al. (Wed,) studied this question.