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The chemical constituents of Cydonia oblonga (Quince) seeds were investigated using chromatographic methods, including silica gel, Sephadex LH-20 and semi-preparative-HPLC. Eleven compounds were isolated and their structures were elucidated on 1D or 2D NMR, and HR-ESI-MS. These analyses have lead to identification of 5, 7-dihydroxy-2-n-pentacosanyl chromen-4-one (1), ursolic acid (2), tormentic acid (3), oleanolic acid (4), β-daucosterol (5), β-sitosterol (6), amygdalin (7), rutin (8), kaempferol (9), quercetin (10) and isoquercitrin (11). Among these, compound 1 is a new compound, and compounds 3, 5 were isolated from this plant for the first time. Compounds 1-4 and 8 showed significant PTP1B inhibitory activities with IC50 value of 0.465, 16.14, 28.96, 23.78 and 11.70 μmol·L-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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