Fractions of biologically active substances, including polysaccharides, iridoids, phenolic acids, and flavonoids, have been isolated from eyebright (Euphrasia brevipila) plants (Scrophulariaceae family) by chromatography on a polyamide sorbent. The following compounds were identified: aucubin; chlorogenic, ferulic, and caffeic acids; apigenin; luteolin; diosmetin; cinaroside; and cosmosiin. The antioxidant activity of the isolated biologically active substances was assessed on the model of lanolin autooxidation at 70°C in comparison to butyloxytoluene. The maximum antioxidant activity was observed for the fraction of phenolic acids that produced a fourfold increase in the stability of lanolin with respect to oxidation.

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