北栽秧花化学成分研究

目的 研究北栽秧花Hypericum pseudohenryi茎叶的化学成分。方法 采用各种柱色谱及制备液相色谱等分离方法对该植物茎叶的化学成分进行分离纯化,经质谱和核磁共振波谱技术进行结构鉴定。结果 从北栽秧花茎叶的丙酮提取物中分离纯化出21个化合物,其结构分别鉴定为3, 4-O-异亚丙基莽草酸（1）、莽草酸（2）、原儿茶酸（3）、咖啡酸（4）、苯甲酸（5）、绿原酸（6）、绿原酸甲酯（7）、1, 3, 6, 7-四羟基氧杂蒽酮（8）、4-羟基-2, 3-二甲氧基氧杂蒽酮（9）、1, 5-二羟基-2-甲氧基氧杂蒽酮（10）、C-3/C-8″双芹菜素（11）、山柰酚（12）、槲皮素（13）、槲皮苷（14）、槲皮素-3-O-β-D-吡喃阿拉伯糖苷（15）、金丝桃苷（16）、异槲皮苷（17）、黑燕麦内酯（18）、杜鹃素（19）、1-棕榈酸单甘油酯（20）和β-谷甾醇（21）。结论 所有化合物均为首次从该植物中分离得到,其中化合物18、20为首次从金丝桃属植物中分离得到。     

大戟属植物的化学成分及药理活性研究进展

大戟属（EuphorbiaL）是大戟科（Euphorbieceae）植物中最大的一个属,全世界有2000余种,我国有80多种。大戟属许多植物是重要的药用植物,二萜酯类成分是大戟属植物的主要活性成分,多数具有抗肿瘤、抗病毒、皮肤刺激以及致癌活性。本文综述了近10年以来大戟属植物有关化学成分及药理活性研究进展。     

苏皖产大戟属药用植物rDNA的ITS序列分析

目的研究苏皖产大戟属内6种药用植物的ITS长度的变异,为探讨大戟属植物的系统演化关系和大戟属植物鉴定提供DNA分子证据。方法利用PCR技术对大戟属植物的rDNAITS区碱基序列进行测定。结果这6种大戟属植物的ITS1的长度范围为255~262bp,ITS2的长度范围为214~236bp。运用Mega2软件进行的系统分析得到大戟属内6种植物的系统进化树。这一分析结果与来自形态学的研究结果相吻合。结论此法可用于大戟属植物种间及真伪品鉴别。     

Evaluation of anti-inflammatory and anti-arthritic property of ethanolic extract of Clitoria ternatea

Objective: Clitoria ternatea is a well-known bioactive plant used to treat several inflammatory ailments in Ayurvedic system of medicine in India. The present investigation aimed to determine the anti-inflammatory and anti-arthritic activity of ethanolic extract of Clitoria ternatea roots (EECT) in animal models. Methods: The anti-inflammatory activity of the EECT was evaluated by carrageenan and histamine-induced paw edema. Results: EECT showed a significant reduction in mean paw edema volume in both carrageenan and histamine-induced inflammation. The efficacy of EECT in rheumatoid arthritis was tested against Freund’s complete adjuvant (CFA) induced arthritic models in Wistar rats. The anti-arthritic effect of EECT was determined by systematic scoring of arthritis symptoms and measuring paw edema. A considerable decrease in paw diameter was observed in the EECT (200 and 400 mg/kg) and diclofenac (10 mg/kg) treated groups after day 7. Diclofenac (10 mg/kg) and EECT (400 mg/kg) showed a significant reduction in paw diameter from day 14 compared with CFA control (P < 0.001). The anti-arthritic activity was also confirmed from the altered biochemical, haematological (Hb, RBC and WBC) and anti-oxidant parameters (SOD, MDA, CAT, and GSH). EECT (400 and 200 mg/kg) also showed a marked inhibition of joint destruction. Conclusion: This study provides a pharmacological rationale for the traditional use of C. ternatea against inflammation and rheumatoid arthritis in India.     

Long-term consumption of virgin coconut (Cocos nucifera) oil diet impairs learning and memory in CD1 mice

Objective: Virgin coconut oil (VCO) has been used in the management of dementia in Alzheimer’s disease (AD). Therefore, this research investigated the effect of long-term consumption of VCO diet on learning and memory in CD1 mice. Methods: Thirty male CD1 mice (divided into three groups, n = 10) were fed with standard rodent chow (control), 5% and 20% VCO diets (respectively) for 28 d. The Morris Water Maze (MWM) test was used to test the effect of VCO on visuo-spatial learning and memory, while the Novel Object Recognition Test (NORT) was used to measure short- and long-term recognition memory. Results: Learning performance of mice did not differ in the MWM. During the probe trial, duration in the retention quadrant and annulus crossings were lower (P < 0.05) in the 5% and 20% VCO diet groups compared to the control diet group, showing that VCO impaired visuo-spatial memory. During the NORT, mice showed more total approaches in the 20% VCO diet group (P < 0.05) compared to control and the 5% VCO diet groups during the short-term memory test. During the long-term memory retention test, the total approaches were also higher in the 20% VCO group compared to control and 5% VCO group (P > 0.05). The discrimination index was also lower in the 20% VCO group compared to control and 5% VCO diet groups indicating impaired long-term cognitive memory in mice given 20% VCO diet. Histological examination of brains showed damage within the CA1 pyramidal cell layer of the hippocampus in the 20% VCO diet group, in line with the behavioural observations. Conclusion: Long-term consumption of virgin coconut oil diet impairs memory in mice.     

木犀草素提取和纯化工艺的研究进展

木犀草素作为一种天然黄酮类化合物,存在于多种植物中,研究表明其具有多种药理作用,开发前景良好,受到国内外研究学者的广泛关注.针对木犀草素的特性,不同工艺具有不同的提取效率.对近年来木犀草素的提取纯化工艺进行了综述,论述了各种工艺的原理及特点,并进行比较,探讨了不同工艺用于实际生产的可能性,以及今后的研究趋势,为后续的研...