HPLC-DAD analysis, antifungal and antioxidant activity of Solanum dolichosepalum bitter extracts and fractions

ABSTRACT

Abstract Solanum dolichosepalum is a plant with anti-infective effects. It is a healing agent and has ethnopharmacological uses. In this study, the antifungal activity of extracts and fractions of this species on C. albicans and F. oxysporum was evaluated. The antioxidant activity was measured using the ABTS and DPPH methods, and by determining the total content of phenolic compounds. An HPLC-DAD qualitative analysis was carried out to identify phenolic compounds and alkaloids. Pearson's correlation coefficients were calculated. Inhibitory effects were found in all the extracts and fractions on the analyzed microorganisms. F. oxysporum was the microorganism most sensitive to the action of S. dolichosepalum extracts. All extracts and fractions showed antioxidant activity, with the acetone extract and the acetone fraction being those that generated the best results. The content of total phenolic compounds showed that acetone has a greater affinity with the phenolic compounds present in S. dolichosepalum. In this plant, p-Hydroxybenzoic, vanillic, ferulic, trans-cinnamic, caffeic, p-coumaric, and rosmarinic acids were found, as well as theobromine, quercetin, and luteolin. The content of total phenolic compounds was determined to be directly proportional to the inhibition of the ABTS and DPPH radicals, and the inhibition of the analyzed microorganisms. It was determined that the extracts and fractions obtained from S. dolichosepalum show antioxidant and antifungal activity.