The current trend worldwide is searching plant extracts towards prevention of neurodegenerative disorders. This study aimed to investigate the neuroprotective effect of Alpinia galanga leaves (ALE), Alpinia galanga rhizomes (ARE), Vitis vinifera seeds (VSE), Moringa oleifera leaves (MLE), Panax ginseng leaves (PLE) and Panax ginseng rhizomes (PRE) ethanolic extracts on human neuroblastoma (SHSY5Y) cells. The 1-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging of VSE andMLE were 81% and 58%, respectively. Ferric-reducing antioxidant power (FRAP) of ALE and MLE (33.57 0.20 and 26.760.30 mol Fe(II)/g drywt., respectively)were higher than for the other extracts. Liquid chromatography coupled to quadrupole time-of-flight mass spectrometry (LC-QTOF/MS) revealed MLE active compounds. Intracellular study by nitro-blue tetrazolium(NBT) test showed thatMLE and VSE had high O2 scavenging (0.83 0.09 vs. 0.98 0.08 mg/mL, respectively). MLE had the highest ROS scavenging followed by PRE (0.71 0.08 vs. 0.83 0.08 mg/mL, respectively), by 2,7-dichlorodihydrofluorescein diacetate (DCFHDA) assay. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) cytotoxicity and neuroprotection tests on SHSY5Y showed that PRE had a better neuroprotective effect but higher cytotoxicity compared toMLE (viable cells 51%vs. 44%, IC50 1.92 0.04 vs. 2.7 0.2 mg/mL, respectively). In conclusion, among the studied plants,MLE has potential for developing as a neuroprotective agent.
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