The purpose of this study was to identify sesquiterpenoids from Alpinia oxyphylla Miq. fruits under the guidance of LC-MS, and to evaluate their neuroprotective effects on the HO-induced SH-SY5Y cells. A total of 35 sesquiterpenoids, including 10 previously unreported ones, were isolated from A. oxyphylla fruits. The neuroprotective effect studies showed that compounds 2, 3, 12, 13, 20, 22, 25, 26, and 35 can improve the viability rates of the HO-induced SH-SY5Y cells whose viability rates were ≥ 80% and were higher than that of the positive control. Furthermore, thorough activity studies showed that compounds 3, 13, 22, and 35 can inhibit the production of ROS (reactive oxygen species), and that compounds 13, 22, and 35 can reduce both MDA (Malondialdehyde) and NO levels in the damaged cells in displaying a neuroprotective effect. This study confirmed that the fruits of A. oxyphylla contained abundant sesquiterpenoids with potential neuroprotective effect.
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