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Medicinal plants are important in the treatment of human diseases. The medicinal properties of plants are attributed to the presence of secondary plant metabolites. Polyphenols, particularly fl avonoids, are phytochemicals that possess antioxidant and anti-infl ammatory activity, and modulate pathways involved in obesity and glucose metabolism. In folk medicine, a single plant may be used to treat various diseases owing to the presence of phytochemical varieties in plants. In this study, the acetone leaf extracts of Curtisia dentata, Pittosporum viridifl orum, and Portulacaria afra were investigated for total polyphenol and total fl avonoid content as well as for anti-infl ammatory, antioxidant, and glucose utilization activities by using standard methods. The C. dentata extract exhibited the highest polyphenols (125.12  2.18 mg/g GAE) and fl avonoids (27.69  4.98 mg/g QE). The P. viridifl orum extract exhibited the strongest DPPH radical antioxidant activity (IC 50 value 5 12.94  1.09 µg/ml) and anti-infl ammatory activity by inhibiting 5-lipoxygenase activity (IC 50 value 5 46.50  4.54 µg/ml). All extracts enhanced dose-dependent glucose utilization activity of muscle cells and adipocytes. P. viridifl orum enhanced the highest glucose utilization of C2C12 muscle cells (67.34  0.51%), while C. dentata enhanced the highest glucose utilization of 3T3-L1 adipocytes (63.72  0.48%) at the highest concentration of 500 µg/ml, with no signifi cant difference (p  0.05). Polyphenols may be responsible for the observed 3T3-L1 cells glucose utilization activity of C. dentata. However, the polyphenols alone may not be responsible for the antioxidant, anti-infl ammatory, and C2C12 cells glucose utilization activity of P. viridifl orum. To our knowledge, this is the fi rst study to demonstrate the glucose utilization potential of the species of medicinal plants.

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To compare the phytochemical and biological profiles, infusion and decoction extracts of dried Hibiscus sabdariffa calyces were prepared. Infusion extract had the highest phenolic content (292.42 ± 0.62 mg GAE/g extract) and antioxidant activity (TEAC = 3.09 ± 0.28). It also potently inhibited the activities of α-amylase (58.57 ± 1.4%), α-glucosidase (66.92 ± 2.5%) and 5-lipoxygenase (58.97 ± 1.17 μg/ml). All extracts showed weak cytotoxicity as tested on Vere monkey kidney cells.