Peaks were identified by comparison of their retention times (Rt) (1 = 8.0 min; 2 = 6.2 min; 3 = 8.2 min; 4 = 11.5 min; 5 = 19.4 min; 6 = 8.8 min; 7 = 5.7 min; 8 = 7.3 min) and co-injection with authentic standards isolated from Hypericum species (benzophenones 1 and 2 from H.
This is the first study reporting the leishmanicidai activity for Hypericum species on L amazonensis.
Significant differences in the leishmanicidai activity of extracts obtained from different Hypericum species were observed.
Determination of phenolic compounds in flowers of Hypericum species native to South Brazil and Peruvian Paramos.
Phloroglucinol derivatives from four Hypericum species belonging to the Trigynobrathys section.
Chemical and pharmacological aspects of Southern Brazilian Hypericum species, in: Silva, J.T.
Polyphenol compounds such as tannins, flavonoids and phenolic acids were the most prominent components of the crude extracts investigated and could contribute to the antimicrobial activity of the Hypericum species extracts.
Condensed tannins are found frequently in Hypericum species and can be present in high levels (up to 16%) (Kartnig et al.
In Hypericum species, flavonoids are abundant, representing 11% in the flowers and 7% in the leaves of H.
Crude extracts of other native Hypericum species will also be evaluated against bacteria and fungi.
Kartnig T, Gruber A, Sauer H (1989) Comparative phytochemical investigations of Hypericum species. Planta Med 55: 215
Umek A, Kreft S, Kartnig T, Heydel B (1999) Quantitative phytochemical analyses of six Hypericum species growing in Slovenia.