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Chemistry and Industry of Forest Products ›› 2023, Vol. 43 ›› Issue (3): 9-15.doi: 10.3969/j.issn.0253-2417.2023.03.002

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Chemical Constituents of the Leaves of Eucommia ulmoides and Its Neuroprotective Activity

Fengcheng HU1,2, Rui HAN1, Cong GUO1, Jiangjiang TANG1,2, Jinming GAO1,2,*()   

  1. 1. Lueyang County Forest Tree Seedling Workstation, Forestry Bureau of Lueyang County, Lueyang 724300, China
    2. College of Chemistry & Pharmacy, Northwest A & F University, Yangling 712100, China
  • Received:2022-06-15 Online:2023-06-28 Published:2023-06-27
  • Contact: Jinming GAO E-mail:jinminggao@nwsuaf.edu.cn

Abstract:

The ethanolic extracts of Eucommia ulmoides Oliv. leaves were isolated and purified, where thirteen compounds were obtained, including one new compound and twelve known compounds. The structures of the compounds were identified by spectral data as follows: (R, 9Z, 12E, 15Z)-11-hydroxyoctadeca-9, 12, 15-trienoic acid(1), 7-hydroxycoumarin(2), astragaline(3), quercetine(4), quercetin-3-O-glucoside(5), 2-(3, 4-dihydroxyphenyl)-5, 7-dihydroxy-3-[(3-O-α-D-xylopyranosyl-α-D-galactopy-ranosyl)oxy]-4H-1-benzopyran-4-one(6), (2R, 3S)-3-(4-hydroxy-3-methoxyphenyl)-3-methoxypropane-1, 2-diol(7), (2S, 3R)-3-(4-hydroxy-3-methoxyphenyl)-3-methoxypropane-1, 2-diol(8), chlorogenic acid(9), gardendiol(10), 4-benzyloxy benzoic acid(11), vanillic acid(12) and myristic acid(13). Among them, compound 1 was a new fatty acid compound. The anti-neuroinflammatory and neuroprotective activities of 13 compounds were studied. The results showed that compounds 4, 5 and 10 exhibited significant anti-neuroinflammatory activity by inhibiting the release of nitric oxide(NO) production in lipopolysaccharide(LPS)-induced in mouse microglia(BV-2 cells), with half inhibitory concentration(IC50) values of (10.8±0.9), (9.7±1.1) and (10.7±0.3) μmol/L, respectively. Compound 5 exhibited significant neuroprotective activity under oxidative stress. After pretreatment with 20 μmol/L H2O2-induced rat adrenal pheochromocytoma cells(PC-12 cells), the cell survival rate was (86.5±0.5)%, which was higher than that of the positive control hesperidin.

Key words: Eucommia ulmoides leaves, chemical constituents, anti-neuroinflammatory, neuroprotection

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