Two new C-glucoside flavonoids, namely 8-C-b-D-(2-O-acetyl) glucofuranosyl apigenin and 3-O-acetylvitexin, were isolated from leaves of Crataegus pinnatifida Bge. var. major N. E. Br.. Their structures were elucidated...Two new C-glucoside flavonoids, namely 8-C-b-D-(2-O-acetyl) glucofuranosyl apigenin and 3-O-acetylvitexin, were isolated from leaves of Crataegus pinnatifida Bge. var. major N. E. Br.. Their structures were elucidated by the spectroscopic means and chemical evidence.展开更多
A new flavonoid, namely pinnatifine I (1), was isolated from the leaves of Crataegus pinnatifida Bge. var. major N.E.Br.. Its structure was elucidated by spectroscopic analysis and chemical evidence.
[Objectives] To determine the nine phenolic components in the leaves of Crataegus pinnatifida Bge. [Methods] The reversedphase high-performance liquid chromatography( RP-HPLC) was applied. [Results] Nine phenolic comp...[Objectives] To determine the nine phenolic components in the leaves of Crataegus pinnatifida Bge. [Methods] The reversedphase high-performance liquid chromatography( RP-HPLC) was applied. [Results] Nine phenolic components showed a good linear relationship in the range of 2-500 μg/m L with r in the range of 0. 999 5-0. 999 9. The recovery rate of spiked samples ranged from 93. 7% to110. 2%,and the relative standard deviation was in the range of 0. 69%-4. 58%. The leaves of 29 cultivars of C. pinnatifida Bge. were measured,and the average content of the nine phenolic components was as follows: isoquercitrin,hyperoside,procyanidin C1,procyanidin D1,epicatechin,procyanidin B2,chlorogenic acid,eucomic acid,and vitexin 2 "-O-rhamnoside. The contents of flavonoids and phenolic acids were high,up to 15 mg/g D. W,and the content of procyanidins was up to 6 mg/g D. W. [Conclusions]This method is easy and accurate in determination of phenolic components in the leaves of C. pinnatifida Bge.展开更多
文摘Two new C-glucoside flavonoids, namely 8-C-b-D-(2-O-acetyl) glucofuranosyl apigenin and 3-O-acetylvitexin, were isolated from leaves of Crataegus pinnatifida Bge. var. major N. E. Br.. Their structures were elucidated by the spectroscopic means and chemical evidence.
文摘A new flavonoid, namely pinnatifine I (1), was isolated from the leaves of Crataegus pinnatifida Bge. var. major N.E.Br.. Its structure was elucidated by spectroscopic analysis and chemical evidence.
基金Supported by Project of Natural Science Foundation of Hebei Province(C2015204187)
文摘[Objectives] To determine the nine phenolic components in the leaves of Crataegus pinnatifida Bge. [Methods] The reversedphase high-performance liquid chromatography( RP-HPLC) was applied. [Results] Nine phenolic components showed a good linear relationship in the range of 2-500 μg/m L with r in the range of 0. 999 5-0. 999 9. The recovery rate of spiked samples ranged from 93. 7% to110. 2%,and the relative standard deviation was in the range of 0. 69%-4. 58%. The leaves of 29 cultivars of C. pinnatifida Bge. were measured,and the average content of the nine phenolic components was as follows: isoquercitrin,hyperoside,procyanidin C1,procyanidin D1,epicatechin,procyanidin B2,chlorogenic acid,eucomic acid,and vitexin 2 "-O-rhamnoside. The contents of flavonoids and phenolic acids were high,up to 15 mg/g D. W,and the content of procyanidins was up to 6 mg/g D. W. [Conclusions]This method is easy and accurate in determination of phenolic components in the leaves of C. pinnatifida Bge.
