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The chemical constituents in the bark of Eucommia ulmoides were isolated and purified using chromatographic techniques, including silica gel, Sephadex LH-20, ODS, MCI, and semi-preparative HPLC. The structures of the compounds were elucidated by spectroscopic analyses (NMR, IR, UV, and MS). A total of six compounds were identified as duzhonglactone (1), (7S, 8R)-4-hydroxy-3, 3′, 5′-trimethoxy-8, 9-dinor-8, 4′-oxyneoligna-7, 9-diol-7′-aldehyde (2), armaosigenin (3), (-) evofolin B (4), N-trans-feruloyltyramine (5), and C-veratroylglycol (6). Among them, compound 1 was a new five-membered ring lactone, while compounds 2-5 were isolated for the first time from Eucommia ulmoides bark. Furthermore, compounds 2-4 demonstrated antioxidant activity, with IC50 values for 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging of 46.34 ± 5.80, 74.17 ± 8.71, and 78.02 ± 8.94 μg·mL-1, and for 2, 2′-azinobis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) scavenging of 50.56 ± 1.35, 54.37 ± 3.04, and 55.61 ± 3.41 μg·mL-1, respectively.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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