Effects of Hibiscus sabdariffa Linn.fruit extracts on α-glucosidase enzyme, glucose diffusion and wound healing activities

ABSTRACT

Objective:To provide in vitro evidence for antidiabetic activity through potential inhibition of α-glucosidase enzyme,glucose diffusion and enhancement in the wound healing using methanolic extract and fractions from Hibiscus sabdariffa Linn.fruit.Methods:The inhibitory action of methanolic extract and fractions of such fruit on α-glucosidase enzyme and glucose movement through in vitro assay assessment was reported.Their activities on wound healing were tested using the scratch assay.Results:Ethyl acetate fraction at 50 mg/mL concentration exhibited significant α-glucosidase inhibition (95.79 mg/mL) with P ＜ 0.05.At the same concentration,the methanolic extract as well as other fractions revealed lower α-glucosidase inhibition and higher glucose diffusion retardation across the dialysis tube than the control.Ethyl acetate and butanol fractions displayed notably higher glucose diffusion inhibitory activity of 5.21 mmol/L and 5.2 mmol/L,respectively as compared to methanolic extract and n-hexane fraction of 6.58 mmol/L and 6.49 mmol/L,respectively.Conversely,compared to other fractions the methanolic extract and ethyl acetate fraction manifested proliferative effect at the incubation time of 6 h during the wound healing study.Conclusions:It is established that methanolic extract and fractions from H.sabdariffa Linu.fruit can inhibit the α-glucosidase enzyme and glucose movement as well as influence the wound healing activity positively.