苦碟子中的木质素和酚酸类成分研究

利用硅胶柱色谱和HPLC分别对苦碟子地上部分和根部化学成分进行分离,从地上部分中得到2种木脂素类化合物,从根部中得到2种酚酸类化合物。经＾1HNMR、＾13CNMR等鉴定它们的结构分别为：4,8-（3＇-甲氧基,4’-羟基）-二苯基-2,6-二羟基-双四氢呋喃木质索（1）,（＋）-丁香树脂酚（2）,咖啡酸（3）和3,4-二羟基苯甲酸（4）。4种化合物均为首次从该植物中分离得到。     

3,5-二硝基水杨酸法测定金钱草多糖的研究

用溶剂法对金钱草多糖进行提取分离,研究并确定了用3,5-二硝基水杨酸(DNS)比色法测定金钱草多糖含量的方法,测定条件为:DNS最佳用量为2.0 mL,最佳显色时间为5.0 min,最优的温度为沸水加热.对金钱草多糖样品平行测定6次,相对标准偏差(RSD)为3.98%.样品加标回收率在92.52%～104.49%之间,检出限为0.022 mg/mL.     

微红梢斑螟空间分布型的研究

应用频次分析法和聚集度指标法对微红梢斑螟在马尾松和火炬松林中的空间分布进行研究．微红梢斑螟在马尾松和火炬松林中的分布为聚集分布，主要是负二项分布．其聚集是某些环境作用所致，而不是微红梢斑螟本身的聚集习性．     

高良姜中二苯基庚烷类化合物的高速逆流色谱分离制备

应用高速逆流色谱法(HSCCC)分离纯化了高良姜中3种二苯基庚烷类化合物。以正己烷-乙酸乙酯-甲醇-水(2:3:1.75:1, v/v/v/v)为两相溶剂系统,下相为固定相,上相为流动相,在主机转速为858 r/min、流速1.5 mL/min的条件下,从122.20 mg高良姜石油醚萃取物中经一步HSCCC分离可制备得到5R-羟基-7-(4-羟基-3-甲氧基苯基)-1-苯基-3-庚酮(7.37 mg)、7-(4-羟基-3-甲氧基苯基)-1-苯基-4E-烯-3-庚酮(9.11 mg)和1,7-二苯基-4E-烯-3-庚酮(15.44 mg),经高效液相色谱分析,纯度均大于93%,各化合物的结构由质谱和核磁共振氢谱、碳谱鉴定确证。该方法简便、快速、高效,可用于高良姜中二苯基庚烷类化合物的快速分离制备。     

绵毛马兜铃挥发油化学成分的GC/MS分析

采用水蒸气蒸馏法提取绵毛马兜铃中的挥发油,以气相色谱一质谱连用技术分离和分析马兜铃挥发油的化学成分,用面积归一化法测其相对含量,结果从挥发油的64个峰中鉴定出39个化合物,所鉴定的组分占挥发油色谱总峰面积的75％．     

Novel linear and step‐gradient counter‐current chromatography for bio‐guided isolation and purification of cytotoxic podophyllotoxins from Dysosma versipellis (Hance)

Dysosma versipellis (Hance) is a famous traditional Chinese medicine for the treatment of snakebite, weakness, condyloma accuminata, lymphadenopathy, and tumors for thousands of years. In this work, four podophyllotoxin‐like lignans including 4′‐demethylpodophyllotoxin (1), α‐peltatin (2), podophyllotoxin (3), β‐peltatin (4) as major cytotoxic principles of D. versipellis were successfully isolated and purified by several novel linear and step gradient counter‐current chromatography methods using the systems of hexane/ethyl acetate/methanol/water (4:6:3:7 and 4:6:4:6, v/v/v/v). Compared with isocratic elution, linear and step‐gradient elution can provide better resolution and save more time for the separation of photophyllotoxin and its congeners. Their cytotoxicities were further evaluated and their structures were validated by high‐resolution electrospray TOF MS and nuclear magnetic resonance spectra. All components showed potent anticancer activity against human hepatoma cells HepG2.     

大叶白蜡翅果种子双生现象初报

大叶白蜡为木犀科白蜡属落叶乔木,果形独特美观,可用作庭荫树、行道树或风景林.其翅果倒披针状,多变化,先端钝或凹,或有小尖.正常翅果内种子为1粒,现发现大叶白蜡翅果内有种子双生现象.     

Bioactive Eudesmane sesquiterpenes from Artabotrys hongkongensis Hance

Abstract

A new naturally occurring trinoreudesmane sesquiterpene, artahongkongol A (1), together with seven known eudesmane sesquiterpenes (2?8), was isolated from the stems and leaves of Artabotrys hongkongensis Hance. Among them, 1 is a rare trinoreudesmane sesquiterpene containing 12 carbon atoms on the carbon skeleton. All known compounds (2?8) were isolated from the genus Artabotrys for the first time. The structure of 1 was elucidated by extensive spectroscopic methods and the known compounds were identified by comparisons 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?8 showed significant inhibitory effects against various human cancer cell lines with IC₅₀ values ranging from 0.57 to 15.68?μM.     

水杨梅化学成分研究

采用柱色谱技术,对水杨梅的化学成分进行分离,从水杨梅乙醇提取物的乙酸乙酯萃取部位分离得到3个化合物,从正丁醇萃取部位分离得到4个化合物;根据光谱分析和文献对照的方法鉴定它们的结构分别为:异香草酸(1),七叶内酯(2),咖啡酸(3),5-hydroxy-2-methylchromone-7-O-β-D-xylopyranosyl(1→6)-β-D-glucopyranoside(4),东莨菪素(5),7-O-β-D-glucosyl-noreugenin(6),东莨菪苷(7).化合物1、2、3和7为首次从该植物中分离得到.