<![CDATA[Abstract. Vivit MB, Batuyong RG, Damian AFT, Gaoat CA, Beltran KGD, Alejo AB, Calaramo MA, Ibana FV, Batuyong MAR. 2024. Metabolite profiling, in vitro antioxidant and a-glucosidase inhibitory properties of Timonius ternifolius leaves. Biodiversitas 25: 3027-3034. The genus Timonius (Rubiaceae) possesses different pharmacological properties. One understudied endemic species under this genus from the Philippines is the Timonius ternifolius (Bartl. ex DC.) Fern.-Vill. Hence, this study investigates the physicochemical properties and phytochemical constituents of the leaf ethanolic extract (EE) and subjected to solvent partitioning to yield the following subfractions: hexane (HE), ethyl acetate (EA), and methanol (ME) extracts, which were utilized for the in vitro antioxidant, a-glucosidase and a-amylase assays. Quantitative tests of T. ternifolius leaves revealed the following physicochemical properties: herbal tea-like odor, fibrous and fluffy appearance, 50.07% moisture content, 3.10% total ash content, and a slightly acidic pH value of 5.13. The liquid chromatography-mass spectrometry (LC-MS) analysis has identified eight putative compounds namely glabrolide, aloinoside B, 2-benzyl octanal, geumonoid, (±) gomisin M1, 25-O-Acetyl-7,8-didehydrocimigenol-3-O-a-D-xylopyranoside, lucialdehyde B, and kadsuric acid. The extracts' concentrations of flavonoids, phenols, and terpenoids were 1.23±0.19 mg QE/g, 20.77±0.77 mg GAE/g, and 6.07±0.53 mg/g, respectively. Antioxidant profiling among the subfractions showed EE exhibiting the highest at 59.15±2.08 µg/mL (IC50 value). Moreover, significant a-glucosidase inhibition was noted in the EE extract at 99.74%, EA at 99.71%, and ME at 99.45%. The results showed that T. ternifolius leaves are a promising lead source of pharmacologically active compounds with antioxidant and antidiabetic activities, expanding information on plant-derived alternative treatments and developing medicinal products.]]>
