The main purpose of this study was to evaluate the antioxidant and α-glucosidase inhibitory
activities of Phyllanthus acidus. The P. acidus fruits were dried using three different methods,
namely oven (OD), air (AD) and freeze (FD) dryings and extracted with ethanol at different
ratios (50 and 100%). The proximate analysis and total phenolic content (TPC) as well as
free radical scavenging and α-glucosidase inhibitory activities were determined. The proximate
analysis of P. acidus fruit indicated that all the dried samples contained potential nutrient
contents. The highest TPC value, α-glucosidase inhibitory and antioxidant activities were
observed for 50% ethanolic extract from OD method with TPC value of 28.39 mg GAE/g dried
extract, IC50 value of 12.394 μg/mL and 64.17% inhibition, respectively. The study revealed
that phenolic compounds could be the main contributors to the antioxidant and α-glucosidase
inhibitory activities based on the Pearson correlation coefficients with R values of 95.0 and
73.8%, respectively. The study could provide scientific evidence for some folk uses in the
treatment of diseases related to the production of reactive oxygen species and oxidative stress.