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α-Glucosidase inhibitory activities of crude extract, Fr.A, Fr.C and Fr.D at concentrations of 160, 80, 40, 20, 10 and 5 μg/mL, respectively. Values are presented as inhibitory rate compared to the blank control. Means significantly lower than the controls are indicated with one asterisk (*) (Dunnett’s one-sided t test; p < 0.05) or two asterisks (**) (p < 0.01). Error bars are one standard error of the mean. N = 5
