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Conclusions

 The glycosides are the natural synthesized secondary metabolites of plants
having the chemical structure consists from monosaccharide and different

aglicons.

 The biological activities of glycosides, including the antioxidant capacity,
depend on chemical structure.

 Furostanol glycosides are more active in scavenging of free radicals than
spirostanol glycosides. This fact is explained by the presence in chemical
structure the mobile hydrogen atom of hydroxyl group, which scavenges
peroxyl radicals to form stable radicals that inhibit the oxidation reaction.

 According to the structure - activity relationship of glycosides tested the
antioxidant activity is largely related to the number of hydroxyl groups and
the length of sugar chains in chemical structure

 The glycosides such as verbascoside, tomatoside, capsicoside,
scrophularioside possess high antioxidant activity (higher than the
reference - asparagoside), and can be recommended as adaptogens for plants
treatment