期刊
MOLECULES
卷 23, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/molecules23123254
关键词
Toona sinensis; xanthine oxidase; uric acid; hyperuricemia; ultraperformance liquid chromatography-quadrupole time-of-flight mass spectrometry
资金
- Korea Institute of Oriental Medicine - Korean government (Ministry of Science and ICT) [K18030]
- National Research Council of Science & Technology (NST), Republic of Korea [K18030] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Toona sinensis leaf is used as a seasonal vegetable in Korea. A 70% ethanol extract of these leaves exhibited potent xanthine oxidase (XO) inhibition, with a 50% inhibitory concentration (IC50) of 78.4 mu M. To investigate the compounds responsible for this effect, bioassay-guided purification led to the isolation of five constituents, identified as quercetin-3-O-rutinoside, quercetin-3-O--d-glucopyranoside, 1,2,3,4,6-penta-O-galloyl--d-glucopyranose (compound 3), quercetin-3-O--l-rhamnopyranoside, and kaempferol-3-O--l-rhamnopyranoside. Compound 3 showed the most potent inhibition of XO, with an IC50 of 2.8 mu M. This was similar to that of allopurinol (IC50 = 2.3 mu M), which is used clinically to treat hyperuricemia. Kinetic analyses found that compound 3 was a reversible noncompetitive XO inhibitor. In vivo, the T. sinensis leaf extract (300 mg/kg), or compound 3 (40 mg/kg), significantly decreased serum uric acid levels in rats with potassium oxonate-induced hyperuricemia. Furthermore, ultraperformance liquid chromatography-quadrupole time-of-flight mass spectrometry analysis identified a high level of compound 3 in the leaf extract. These findings suggest that T. sinensis leaves could be developed to produce nutraceutical preparations.
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