Abstract
This study was conducted to evaluate the phenolic content, antioxidant potential, and enzyme inhibitiory properties of Rumex nepalensis by in vitro spectrophotometric methods. The experiments demonstrated that glutathione S-transferase (GST), α-glycosidase (α-Gly), acetylcholinesterase (AChE), and butyrylcholinesterase (BChE) enzymes were strongly inhibited by R. nepalensis extracts. The IC50 values for GST, α-Gly, AChE, and BChE enzyme inhibitions were calculated as 21.01 mg/mL, 34.65 mg/mL, 27.72 mg/mL, and 17.32 mg/mL, respectively. Also, effective antioxidant capacities of water and methanol extracts of R. nepalensis were determined by ABTS, CUPRAC, DPPH, and FRAP methods. Furthermore, quinic acid (15.61 mg/g), miquelianin (2.06 mg/g), quercitrin (1.97 mg/g), and protocatechuic acid (0.217 mg/g) were identified to be the major phenolic compounds of the plant extract according to the LC-MS/MS analysis. Finally, molecular docking studies were carried out to show the interactions of quinic acid, miquelianin, and quercitrin with AChE, BChE, GST, and α-Gly enzymes. Docking analysis indicated the possible roles of these phytochemicals in enzyme inhibitory activities.
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