Bioactivity-Guided Isolation of Secondary Metabolites with Antioxidant and Antimicrobial Activities from .

has important ornamental, medicinal, and food values, which also have tremendous potential for exploiting bioactivities. We performed the bioactivity-guided (antioxidant and antimicrobial) screening of eight fractions obtained from the ethyl acetate phase of . The antioxidant activity was measured by DPPH, ABTS, and FRAP, and the antibacterial activity was measured by the minimum inhibitory concentration (MIC) of , and . The results of bioactivity-guided isolation indicated that the major antioxidant compounds in the ethanolic extracts of may be present in fractions (Fr.) (A-G, obtained after silica gel column chromatography). Fr. (D-I, obtained after silica gel column chromatography) is a fraction of with antimicrobial activity. The structures of compounds were determined by spectral analysis and nuclear magnetic resonance (NMR) combined with the available literature on secondary metabolites of leaves. In this study, 17 compounds were identified, including four phenolics (, -, and ), a phenylpropane (), five terpenoids (-, , and ), four flavonoids and flavonoid glycosides (- and ), and two lignins ( and ). Compounds -, -, and were isolated from the genus for first time. The remaining compounds were also isolated from for first time. The evaluation of antioxidant and antimicrobial activities revealed that compounds , , , and exhibited higher antioxidant activity than the positive control drug (ascorbic acid), and compounds , , and showed similar activity to ascorbic acid. The other compounds had weaker or no significant antioxidant activities. The MIC of antibacterial activity for compounds , , and - against . was comparable to that of the positive control drug tetracycline at 125 µg/mL, and other secondary metabolites inhibited . and . at 250-500 µg/mL. This is also the first report of antioxidant and antimicrobial activities of compounds -, -, and . The results of the study enriched the variety of secondary metabolites of and laid the foundation for further research on the pharmacological efficacy and biological activity of this plant.