The focus of the presented study is the in vitro anti-oxidant activity and anti-diabetic potential of water extracts from the following four herbal substances, not traditionally used for treatment of diabetes mellitus – leaves of Sambucus ebulus L. and Prunus mahaleb L., and flowering stems of Cichorium intybus L. and Satureja kitaibelii Wierzb. ex Heuff. The water extracts are obtained through ultrasonication. The extract of S. kitaibelii stands out due to its highest values in all studied indicators – total phenolic content, scavenging potential (DPPH, ABTS) and α-glucosidase inhibitory activity which was six times higher than acarbose. The extract of C. intybus also showed significant α-glucosidase inhibitory activity compared to acarbose. The flowering stems of both species are promising sources of biologically active substances for blood sugar control in diabetes mellitus.
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