New Terpenoids And Lignans From The Twigs Of Tripterygium Hypoglaucum

Abstract

Six new compounds, including three terpenoids (1-3) and three lignans (4-6), were isolated from the 95% EtOH extract of the twigs of Tripterygium hypoglaucum. Their structures were determined on the basis of extensive spectroscopic analysis. 9′-O-benzoyl-lariciresinol (4) showed weak cytotoxicity against HepG2/Adr cells, with an IC₅₀ value of 30.1?μM in vitro.     

A new triterpenoid from the roots of Tripterygium Wilfordii

<正>A new triterpenoid 3,4,6-trihydroxy-2-oxo-1(10),3,5,7-tetraen-23,24-nor-D:A-friedooleana-29-oic acid,as well as twelve known terpenes were isolated from the roots of Tripterygium wilfordii.Its structure was established on the basis of spectroscopic methods.     

Characterization of eight terpenoids from tissue cultures of the Chinese herbal plant,Tripterygium wilfordii,by high‐performance liquid chromatography coupled with electrospray ionization tandem mass spectrometry

In this study, a reliable method for analysis and identification of eight terpenoids in tissue cultures of Tripterygium wilfordii has been established using high‐performance liquid chromatography coupled with electrospray ionization tandem mass spectrometry (HPLC‐ESI‐MS). Our study indicated that sterile seedlings, callus cultures and cell‐suspension cultures can rapidly increase the amount of biological materials. HPLC‐ESI‐MS was used to identify terpenoids from the extracts of these tissue cultures. Triptolide, triptophenolide, celastrol and wilforlide A were unambiguously determined by comparing the retention times, UV spectral data, and mass fragmentation behaviors with those of the reference compounds. Another four compounds were tentatively identified as triptonoterpenol, triptonoterpene, 22β‐hydroxy‐3‐oxoolean‐12‐en‐29‐oic acid and wilforlide B, based on their UV and mass spectrometry spectra. The quantitative analysis showed that all three materials contain triptolide, triptophenolide, celastrol, wilforlide A, and the contents of the four compounds in the cell‐suspension cultures were 53.1, 240, 129 and 964 µg/g, respectively, which were at least 2.0‐fold higher than these in the sterile seedlings and callus cultures. Considering the known pharmacological activity of triptolide and celastrol, we recommend the cell‐suspension cultures as biological materials for future studies, such as clinical and toxicological studies. The developed method was validated by the evaluation of its precision, linearity, detection limits and recovery, and it was successfully used to identify and quantify the terpenoids in the tissue cultures. Copyright © 2014 John Wiley & Sons, Ltd.     

A new abietane diterpenoid from the roots of Tripterygium regelii

A new abietane diterpenoid, tripterregeline A (1), together with six known diterpenoids (2–7), were isolated from the roots of Tripterygium regelii. The structure of 1 was elucidated by extensive spectroscopic methods and the known compounds were identified by comparison with data reported in the literature. All isolated compounds were evaluated for their cytotoxicities against five human cancer cell lines: HL-60, SMMC-7721, A-549, MCF-7 and SW480 in vitro. Compounds 1–7 showed significant inhibitory effects against various human cancer cell lines with IC₅₀ values ranging from 0.58 to 21.06 μM.     

雷公藤内酯酮的极谱行为研究

在不同pH值的相关体系中,雷公藤内酯酮可产生两个还原波,其峰电流和峰电位两者均受酸度的影响;然而,在B-R缓冲体系中,虽然峰电流受溶液酸度的影响,但峰电位基本上保持不变。在pH=5.4的B-R缓冲体系中,雷公藤内酯酮的两峰的峰电位分别为-0.06 V和-1.05 V(vs.SCE);两峰的峰电流与雷公藤内酯酮的浓度在3.16×10-6~3.16×10-5mol/L的范围内成良好的线性关系。循环伏安研究表明,两波都是不可逆吸附波。     

雷公藤新三萜成分的研究

研究雷公藤(Tripterygium wilfordii Hook. f.)根心部分的化学成分. 采用硅胶柱色谱法进行分离, 从其氯仿提取物中分离得1个三萜化合物, 经光谱分析(HREIMS, ¹H NMR, ¹³C NMR, HMBC, HMQC, NOESY)鉴定其结构为3β,22β-dihydroxy-29-nor-D:A-friedoolean-21-one-2β,24-lactone.     

昆明山海棠与南蛇藤红外宏观指纹图谱研究

比较了卫矛科的昆明山海棠和南蛇藤粉末和醇提物的红外图谱特征。两种药材的粉末图中都看到草酸钙和淀粉的特征。醇提物图中都有卫矛醇的特征,但南蛇藤较为明显。两种药材醇提物的二阶导数图有明显差异,说明某些成分含量不同。南蛇藤根图的草酸钙和卫矛醇的峰形都比茎的强和尖,说明其根中草酸钙和卫矛醇的含量比茎大。由于红外法既能快速地找出药材差异,又能准确指认出卫矛醇,所以此法制定的宏观指纹图谱可作为生药鉴定的依据。     

雷公藤内酯酮的2D NMR研究

从雷公藤根皮中分离出一种含三个环氧基的二萜内酯酮化合物(Ⅰ),利用一维和二维NMR技术,通过对¹H和¹³C NMR谱的分析,归属了所有和¹H和¹³C化学位移。     

Quantitative Analysis of Triptolide in Human Whole Blood by LC–APCI-IT-MS-MS

In this study, the development and validation of an analytical method for triptolide in whole blood using high-performance liquid chromatography coupled with atmospheric-pressure chemical ionization ion trap tandem mass spectrometry (LC–APCI-IT-MS-MS) is reported. This is the first report of the systematic development and validation of an LC–MS-MS method for the quantitation of triptolide in human whole blood using prednisolone as an internal standard (IS). Prior to LC–MS-MS analysis, liquid–liquid extraction with ethyl acetate was used to isolate them from the biological matrix. Validation parameters such as specificity/selectivity, limit of quantitation (LOQ), linearity, precision, accuracy and stability are evaluated for this method. The calibration curve was linear (r ² = 0.9973) in the concentration range of 0.5–100.0 ng mL⁻¹ in human whole blood with a lower limit of quantitation of 0.5 ng mL⁻¹. Intra- and inter-day relative standard deviations (RSDs) were less than 8.6 and 11.7%, respectively. Extraction recoveries of triptolide ranged from 81.5 to 88.1%. This assay can be used to determine trace triptolide in human whole blood.