|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5512336||1540220||2017||8 صفحه PDF||سفارش دهید||دانلود رایگان|
- Twelve flavonoids from gold tea were rapidly screened and characterized by LC-MS.
- Six flavonoids were found in the gold tea for the first time.
- Screening Î±-glucosidase inhibitors from gold tea by UF-LC-MS.
- The activity of screened compounds was evaluated, including kinetic analysis.
The ethanol extracts of Chimonanthus nitens Oliv. leaves were prepared sequentially by ethanol gradient elution and tested for their Î±-glucosidase inhibitory. The fraction of 50% ethanol eluate (EE) exhibited the notable inhibition with IC50 of 0.376Â mg/mL. Also, 50% EE was chemically characterized by liquid chromatography-mass spectrometry (LC-MS) analysis. Eight compounds including rutin (1), hyperin (2), isoquercitrin (3), luteoloside (4), astragalin (6), quercetin (13), naringenin (14), kaempferol (15) were identified by compared with standard substances as well as proper luteolin-5-O-glucoside (5), kaempferol-7-O-rhamnoside (9), 5,7,8-trihydroxy-2-methoxyl-flavone-7-O-glucoside (10), kaempferol-7-O-acetyl-galactoside (11). The experiments of ultra-filtration combined with liquid chromatography-mass spectrometry (UF-LC-MS) guided quercetin and kaempferol as the key factors for 50% EE showing highly inhibitory activity on Î±-glucosidase. Quercetin and kaempferol inhibited yeast Î±-glucosidase in a mixed-type manner with IC50 of 66.8 and 109Â Î¼g/mL, respectively. These results would provide theoretical underpinning for the C. nitens Oliv. leaves ethanol extracts used as nutraceutical health supplement in the management of type 2 diabetes.
Journal: International Journal of Biological Macromolecules - Volume 98, May 2017, Pages 829-836