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A high-speed counter-current chromatography (HSCCC) method, using a two-phase solvent system composed of ethyl acetate/ n -butanol/methanol/water (5:1:1:5, v / v / v / v ), was successfully established to separate the five iridoid glucosides 7- O -ethyl sweroside ( 1 ), secologanin dimethylacetal ( 2 ), adinoside F ( 3 ), ( 7R )-secologain n -butyl methyl acetal ( 4 ) and adinoside G ( 5 ) from Lonicerae Japonicae Flos. Their purities were 96.8%, 98.5%, 93.3%, 98.0% and 99.9%, respectively. All the iridoid glucosides were identified by HR-ESI-MS, 1D and 2D NMR. Compounds 3 and 5 are new iridoid glucosides. The anti-inflammatory tests showed that compounds 1 ⁻ 5 all expressed moderate inhibitory effects on β -glucuronidase release in rat polymorphonuclear leukocytes (PMNs) induced by platelet-activating factor (PAF) with IC 50 values ranging from 4.52 to 6.50 µM, while the antibacterial assays demonstrated that all the compounds displayed mild inhibitory activities against Staphylococcus aureus ATCC 25923 with MIC values ranging from 13.7 to 26.0 µg/mL.

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Separation of Five Iridoid Glycosides from Lonicerae Japonicae Flos Using High-Speed Counter-Current Chromatography and Their Anti-Inflammatory and Antibacterial Activities