ABSTRACT
Fourteen flavonoids were isolated and purified from Epimedium sagittatum by various chromatography techniques such as macroporous adsorbent resin, silica gel, ODS, Sephadex LH-20, HW-40C and semi-preparative HPLC. Their structures were identified by analysis of physicochemical properties and spectral data, and determined as 3′-hydroxy-baohuoside-Ⅱ (1), huazhongilexone-7-O-β-D-glucopyranoside (2), kaempferol-3-O-α-L-rhamnoside (3), baohuoside-Ⅱ (4), icariside-Ⅱ (5), kaempferol 3,7-di-O-α-L-rhamnopyranoside (6), (+)-aromadendrin (7), kaempferol 3-O-(2-O-β-D-apiofuranosyl)-α-L-rhamnopyranoside (8), sagittatoside A (9), 2″-O-rhamnosyl icariside-II (10), apigenin-7-O-β-D-glucoside (11), quercetin 3-O-β-D-apiofuranoyl-(1→2)-α-L-rhamnopyranoside (12), kaempferol (13), icariin (14). Among them, compound 1 is a new compound, while compounds 2, 6-8, 11, and 12 were isolated from E.sagittatum for the first time.
ABSTRACT
Qualitative and relatively quantitative methods were used to study the quality of cultivated Epimedium sagittatum (Sieb. et Zucc.) Maxim., Epimedium myrianthum Stearn, and Epimedium pubescens Maxim by ultra high-performance liquid chromatography coupled with photo-diode array and quadrupole time-of-flight mass spectrometry (UHPLC-PDA-Q-TOF/MSE). Thirty-two compounds in cultivated and wild samples of E. sagittatum, E. myrianthum and E. pubescens were identified using UHPLC-Q-TOF/MSE combined with the UNIFI data analysis platform. Principal component analysis (PCA) was used to compare the cultivated and wild samples of these three species. The results show that the chemical compositions of cultivated samples were consistent with the corresponding wild samples. UHPLC-PDA was used to determine the relative content of 12 flavonoids as well as total flavonoids in all samples. The results show that the relative chemical content of these flavonoids in cultivated and wild samples is similar and the quality of cultivated Epimedium is more stable. These qualitative and relatively quantitative methods using UHPLC-PDA-Q-TOF/MSE combined with the UNIFI data analysis platform and PCA can be used to study the quality of cultivated Herba Epimedii. This research provides a scientific basis for the cultivation and rational development and utilization of Epimedium medicinal materials.