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Terap leaves (Artocarpus odoratissimus Blanco) contain various chemical constituents, making it a herbal medicine prospective source, particularly as an antigout. This research aim to determinate characteristics of terap leaves and in vitro antigout activity of terap leaves ethanolic extract. The determination leaves characteristics included macroscopic and microscopic analysis, water and ethanol soluble extract content, and drying shrinkage. The extract antigout activity was determinated through inhibition of xanthine oxidase enzyme in vitro. Leaves characteristics analysis revealed that mature leaves are approximately 31.5 cm long and 18 cm wide. Terap leaves are single leaves, elliptical, blunt leaf tips, rounded bases, rough surfaces, undulating edges, pinnate veins, and yellow veins. Microscopic analysis reveals the presence of anomocytic-type stomata, trichomes, glandular hairs, resin ducts, and trachea. Terap leaves have a water-soluble extract content of 8.72%, ethanol-soluble extract content of 4.29%, and drying shrinkage of 11.38%. The antigout activity tests results indicates that ethanol extract inhibits xanthine oxidase enzyme with an IC50 of 89.63 µg/mL. Terap leaves have antigout properties, so they have the potential to be developed into a quality antigout herbal medicine. [ABSTRACT FROM AUTHOR]

Indonesia, with its biodiversity, is overgrown by various kinds of plants that have medicinal potential, including Terap (Artocarpus odoratissimus Blanco). The leaves of A. odoratissimus are empirically used by local people of Borneo Island to treat gout. The purpose of this study was to determine the antigout activity of the active compound from A. odoratissimus leaves through xanthine oxidase inhibition using the molecular docking method and to determine the ADMET properties of these compounds. Phytochemical screening showed that A. odoratissimus leaf extract contained alkaloids, flavonoids, steroids/triterpenoids, and phenolics. The results of TLC showed that A. odoratissimus leaf extract contained steroid and flavonoid compounds in the form of stigmasterol and rutin. The results of molecular docking showed that flavan-3-ol provided the lowest bond-free energy against xanthine oxidase with a ΔG value of -8.3 kcal/mol, lower than allopurinol and hypoxanthine as reference ligands. Flavan-3-ol interacts with xanthine oxidase through hydrogen bonding with amino acid residues in the form of Arginine 912 and Lysine 1045. The prediction of ADMET properties from flavan-3-ol shows that the compound can be absorbed and has good permeability. Overall, the flavan-3-ol found in A. odoratissimus leaves shows the potential to be developed as a xanthine oxidase inhibitor for use in gout therapy. [ABSTRACT FROM AUTHOR]