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1.
【目的】 基于王三虎教授的“燥湿相混致癌说”探讨半边莲治疗癌症的作用及物质基础,分析中药半边莲提取物的化学成分,为进一步研究其抗癌的活性成分提供依据。【方法】 运用硅胶柱层析、硅胶薄层层析、反相RP-C18柱层析、MCI柱层析、高效液相等多种色谱手段对半边莲展开系统的化学成分研究,并通过各种波谱、光谱手段鉴定各化合物的结构。对分离所得的化合物,采用人乳腺癌细胞MCF-7和人胃癌细胞MGC-803模型进行抗癌活性评价。【结果】 从半边莲中分离鉴定得到 6 个化合物,分别为:matairesino(1)、(8S,9S,8’S)-4,4’-Dihydroxy-3,3’,9-trimetoxy-9,9’-epoxylignan(2)、3β-hydroxyhop-22(29)-ene(3)、parietin(4)、chrysophanol(5)、gaultheriadiolide(6)。木脂素类化合物1、2在20 μmol/L时,细胞抑制率大于50%。【结论】 木脂素类化合物1、2具有潜在的抗胃癌和乳腺癌活性,其中化合物2活性最好,对MGC-803细胞增殖活性的半数抑制浓度(IC50)为9.2 μmol/L。  相似文献   

2.
罗焱  刘丹 《吉林中医药》2020,40(7):948-950
目的比较高良姜素对不同肿瘤细胞的抑制作用。方法采用MTT法检测不同浓度高良姜素对7种肿瘤细胞(MCF-7、A549、MGC-803、PC-3、A875、Hela、HepG-2)的增殖抑制作用。结果高良姜素对7种肿瘤细胞均有不同程度的抑制作用,最敏感的肿瘤细胞为MCF-7,24 h与48 h的IC_(50)为38.76 μmol/L、20.43 μmol/L,其次为HepG-2、MGC-803、A549、Hela、PC-3,敏感度较差的为A875,48 h的IC_(50)为161.25 μmol/L。结论高良姜素具有较为广谱的抗肿瘤作用,对不同的肿瘤细胞抑制作用不同,这种抑制作用呈现出了时间与浓度依赖性。  相似文献   

3.
目的研究溴取代白杨素衍生物的体外抗癌活性。方法合成溴取代的白杨素衍生物,并通过MTT法检测其对人急性粒细胞性白血病(HL-60)细胞、人结肠癌(HT-29)细胞和人胃癌(SGC-7901)细胞增殖抑制作用。结果合成了6个溴取代白杨素衍生物。结论溴取代白杨素衍生物具有良好的抗癌活性(IC50=0.85~11.60μmol/L)。  相似文献   

4.
胡永  段玉书  苑春茂  黄烈军  李霞  顾玮  郝小江 《中草药》2019,50(14):3274-3278
目的研究黔产艾纳香Blumea balsamifera叶中的化学成分并对其进行细胞毒活性评价。方法使用硅胶柱色谱、薄层色谱、Sephadex LH-20凝胶柱色谱等方法分离纯化艾纳香中化学成分,以宫颈癌(HeLa)细胞株、乳腺腺癌(MCF-7)细胞株、肺腺癌(A549)细胞株、胃癌(MGC-803)细胞株、结肠癌(COLO-205)细胞株为供试细胞株,并采用MTT法对分离纯化的化合物进行细胞毒活性筛选。结果从艾纳香中分离得到2个倍半萜内酯,通过波谱数据分析鉴定为艾纳香烯N(1)和艾纳香烯F(2)。细胞毒活性筛选结果表明化合物1对供试的5种细胞株均具有明显的抑制活性,其半数抑制浓度(IC50)值为48.730~97.907μmol/L;化合物2对乳腺腺癌MCF-7细胞株也具有一定的抑制活性,IC50值为91.188μmol/L。结论化合物1为新的倍半萜内酯类化合物;活性筛选结果表明2个倍半萜内酯类化合物都具有一定的细胞毒活性。  相似文献   

5.
目的:探索姜黄素与中低剂量化疗药5-氟尿嘧啶(5-FU)联用对胃癌MGC-803细胞生长、细胞凋亡和细胞周期的影响,为临床上应用姜黄素作为胃癌化疗药5-FU的增效剂,以减少5-FU使用剂量、降低其毒副作用提供实验依据。方法:应用MTT检测法检测药物作用对MGC-803细胞的抑制作用;应用基于AO/EB双染的荧光显微观察法和FITC/PI双染的流式细胞技术检测药物作用对MGC-803细胞凋亡的影响;应用基于PI单染的流式细胞技术检测药物作用对MGC-803细胞周期的影响。结果:姜黄素(25 μmol·L-1)分别与低剂量(2.4 μmol·L-1)和中剂量(4.8 μmol·L-1)的5-FU联合作用能有效地抑制MGC-803细胞的生长,诱导细胞凋亡并将细胞周期阻滞在S期,并呈剂量-时间的依赖关系。姜黄素与低剂量5-FU联用组的效果显著优于中剂量(4.8 μmol·L-1)5-FU单用组(P < 0.01),而姜黄素与中剂量5-FU联用组的效果显著优于高剂量(9.6 μmol·L-1)5-FU单用组(P< 0.01),提示姜黄素能显著增强5-FU抗胃癌MGC-803细胞的作用,并呈剂量-时间的依赖关系。结论:本研究为临床上应用姜黄素作为5-FU治疗胃癌的辅助用药,以减少5-FU的使用剂量,从而降低其毒副作用提供了初步的实验依据。  相似文献   

6.
姜黄素对人癌细胞BCH、MGC-803、BEL-7402细胞增殖的影响   总被引:1,自引:0,他引:1  
目的观察姜黄素对人癌细胞系BCH、MGC-83、BEL-7402细胞增殖的影响.方法采用Mosman MTT细胞增殖检测法.结果姜黄素在4×10-5mol/L与BCH细胞接触,在不同时相的药物细胞毒效应不同,其与BCH细胞接触16h是药物细胞毒作用最佳时期.姜黄素在(1×10-5~1×10-4)mol/L范围对上述三种体外培养癌细胞有明显的抑制活性.其IC50分别为3.58×10-5mol/L(BCH)、3.83×-5mol/L(MGC-803)、7.3×10-5mol/L(BEL-7402),并且药效与药物浓度呈相关性.结论姜黄素对三种癌细胞的增殖有明显抑制作用.其药效浓度达到国内抗肿瘤药体外药效评价标准.  相似文献   

7.
独角莲乙醇提取物体外抗肿瘤实验研究   总被引:4,自引:0,他引:4  
目的:通过独角莲20%乙醇提取物对人胃腺癌MGC-803、肝癌Hep-2、肺癌A549、乳腺癌MCF-7细胞杀伤率、半数抑制浓度的测定,确定对独角莲20%乙醇提取物的最佳敏感瘤株并通过透射电镜观察药物作用后该肿瘤细胞形态的变化。方法:1.采用体外细胞培养技术用MTT法,检测药物对各肿瘤细胞的生长抑制作用。2.透射电镜观察药物作用96h的肿瘤细胞形态。结果:独角莲20%乙醇提取物对胃癌MGC-803、肝癌Hep-2、肺癌A549、乳腺癌MCF-7细胞的生长有抑制作用,与细胞作用72h时的IC50分别为(74.14±5.29)mg/mL、(81.61±6.14)mg/mL、(128.26±11.43)mg/mL、(120.26±9.46)mg/mL,与细胞作用48h时的IC50分别为(94.55±6.85)mg/mL、(108.94±8.69)mg/mL、(187.78±9.87)mg/mL、(280.54±14.51)mg/mL;透射电镜观察结果表明独角莲20%乙醇提取物能使MGC-803细胞发生凋亡。结论:独角莲20%乙醇提取物对胃癌MGC-803瘤株最敏感且可使该瘤细胞发生凋亡。  相似文献   

8.
目的:对含有exo-亚甲基环戊酮或α-亚甲基内酯药效团的ent-贝壳杉烯类化合物进行结构修饰,以改善其活性及水溶性。方法:以甜菊苷为原料,在4位羧基接入单糖而得到目标化合物,并使用MTT法对目标化合物进行抗肿瘤活性测试。结果:化合物1b对细胞株HepG2,Bel-7402,A549,MCF-7,MDA-MB-231均表现出了较好的抑制活性,IC50分别为0.12,0.91,0.35,0.08,0.07μmol·L–1。另外,化合物3c对HepG2(IC50=0.01μmol·L–1)具有较强的抑制作用。结论:化合物1b和3c可以作为潜在的抗肿瘤化合物进行深入研究。  相似文献   

9.
生姜中二苯庚烷类化合物的抗氧化
和细胞毒活性研究
  总被引:1,自引:1,他引:0  
目的:研究生姜中二苯庚烷类化合物(1 ~ 5)的抗氧化和细胞毒活性。方法:采用吸光度测试法检测化合物于50 mg &#8226;L–1清除超氧阴离子的效果,同法检测化合物(1 ~ 5)清除1,1-二苯基苦基苯肼(DPPH)自由基之半数清除浓度(IC50),用MDA检测法检查化合物于100 mg&#8226;L–1浓度下抑制大鼠脑匀浆脂质过氧化的能力,以及用MTT法研究化合物抑制过氧化氢(H2O2)诱导的大鼠肾上腺嗜铬瘤细胞(PC12)损伤的活性,并采用MTT法检测化合物对人慢性髓源性白血病细胞株(K562)及其阿霉素耐药株(K562/ADR)的细胞毒活性(IC50)。 结果:化合物1 ~ 5对DPPH自由基有较好的清除作用,化合物5的清除作用最强,IC50(22.6 ± 2.4)μmol&#8226;L-1;化合物1,3和4有抑制大鼠脑匀浆脂质过氧化作用,100 mg&#8226;L–1其抑制率分别为(66.3 ± 15.4)%,(68.7 ± 15.8) %,(72.2 ± 10.6)%;化合物1,3和4对H2O2诱导的PC12细胞损伤有明显的保护作用,且呈量效关系;化合物3对K562及其阿霉素耐药株(K562/ADR)体外增殖有抑制作用,其IC50分别为(34.9 ± 0.6),(50.6 ± 23.5) μmol&#8226;L-1。结论:生姜中的二苯庚烷类化合物1 ~ 5具有特异性的抗氧化作用,化合物3对K562和K562/ADR细胞均显示出显著的细胞毒作用。  相似文献   

10.
目的为寻找活性强的抗非小细胞肺癌(NSCLC)药物,设计、合成了10个结构新颖的香豆素-苯胺嘧啶拼合物7a^7j,并对其抗NSCLC活性进行了初步探讨。方法通过拼合原理,将苯胺嘧啶与香豆素衍生物进行缩合得到目标化合物,采用四甲基偶氮唑蓝(MTT)法对其抗NSCLC细胞增殖活性进行了研究,并应用分子对接技术模拟目标物与表皮生长因子受体(EGFR)的结合模式。结果目标化合物7a^7j的结构经MS、1H-NMR及13C-NMR谱确证;生物活性测试结果表明,目标物对NSCLC细胞株H1975细胞增殖具有不同程度的抑制活性(IC50=2. 70~17. 59μmol·L^-1),其中6个化合物的抑制活性优于对照药吉非替尼(IC50=9. 18μmol·L^-1)。结论化合物7j(IC50=2. 70μmol·L^-1)抗H1975细胞增殖活性较强,值得深入研究。  相似文献   

11.
目的:研究桑白皮(Morus alba)的化学成分及其α-葡萄糖苷酶抑制和DPPH自由基清除活性方法:采用硅胶、凝胶柱色谱和制备HPLC等方法进行分离纯化,通过高分辨质谱和核磁鉴定化合物结构结果:从桑白皮提取物中分离得到了13个化合物,其中化合物1,3和8表现出显著的α-葡萄糖苷酶抑制活性,IC50值分别为147.1 ± 1.1,314.1 ± 0.8和207.6 ± 0.1 µM,均低于阳性对照阿卡波糖(418.6 ± 0.1 µM)。化合物10和11均表现出良好的DPPH自由基清除活性,EC50值分别为2.9 ± 0.1和5.0 ± 0.1 µM,均低于阳性对照维生素C的EC50值(54.8 ± 0.1 µM)结论:化合物1、3和8的α-葡萄糖苷酶抑制活性为首次测定。  相似文献   

12.
Objective: In order to find lead compound with anti-HBV activity from peroxo-bridged diosgenin derivatives obtained with Eosin Y as the photosensitizer.Method: Eosin Y was used as the photosensitizer to activate the oxygen in the air to synthesize novel diosgenin derivatives with peroxo-bridge.The structures of synthesized compounds were identified by NMR and HR-MS.Their cytotoxicity and antihepatitis B activity were evaluated via MTS assay and ELISA method,respectively.Results: Six diosgenin derivatives were synthesized,three of which contained peroxo-bridge,and their structures were confirmed by spectroscopy.It showed that 5 α,8 α-peroxo-6-alkenyl-diosgenin(7)could suppress the production of HBs Ag on transfected HepG2.2.15 cells at low-toxic concentration and the inhibition rate on HepG2.2.15 cells was 18.28% at 12.50 μg/mL,better than that of 3 TC(7.30% at 12.50 μg/mL)and others.Conclusion: Due to its lower cytotoxicity and potential anti-hepatitis B activity,compound 7 could be developed as the promising candidate of anti-hepatitis B drug.It also indicated that the peroxo-bridged derivatives had potential biological values for developing clinical agents.  相似文献   

13.
目的 侵袭性肺念珠菌感染发病率高、治疗棘手、预后差、死亡率高,研究桂皮醛对白念珠菌细胞壁(1, 3)-β-D-glucans的影响,为研发新型靶向抗真菌药物提供依据。方法 对免疫抑制BALB/c小鼠经鼻腔灌注1x107 cfu/ml 50ul白念珠菌菌悬液,口服桂皮醛240mg.kg-1. d-1,连续14d后,取肺组织标本进行 (1, 3)-β-D-glucans测定及透射电镜观察,以氟康唑为对照。结果 肺组织 (1, 3)-β-D-glucans(1160.62±89.65 pg/ml),氟康唑对照组(4285.87±215.62 pg/ml),两组之间对比较P<0.01有统计学差异。肺组织电镜显示, 白念珠菌细胞壁外2-3层(1,3)-β-D葡聚糖层,胞壁溶解脱落,导致胞壁严重缺损,但细胞膜清晰、完整。结论 桂皮醛对肺白念珠菌细胞壁(1, 3)- β-D-glucans具有显著影响,但细胞膜不受影响。说明,桂皮醛有独特的抗白念珠菌细胞壁(1, 3)-β-D -glucans效应。  相似文献   

14.

Objective

To investigate the local initiation role of local exosomes of acupoints in acupuncture analgesic effect.

Methods

Thirty-two rats with adjuvant arthritis were randomly divided into model group (Group CFA), model?+?electroacupuncture group (Group EA), model?+?antagonist?+?electroacupuncture group (Group GW4869?+?EA), and model?+?dimethyl sulfoxide?+?electroacupuncture group (Group DMSO?+?EA), with 8 rats in each group. The model rat s of adjuvant arthritis were prepared by intradermal injection of 0.1?mL of Freund's adjuvant complete into the metatarsal of the right posterior foot to induce inflammation. No intervention was given in Group CFA, while electroacupuncture was performed in the other three groups at “Zúsānl? (足三里 ST 36, bilaterally)” and “Huántiào (环跳 GB 30, bilaterally)” of the rats with the following electroacupuncture parameters: dilatational wave with a frequency of 2/10?Hz, an intensity of 5/10/15 (0.76/1.53/2.3?mA), a duration of 30?min, and an intensity increasing every 10?min. In Group DMSO?+?EA, DMSO (with a concentration of 0.2%, 50µL/acupoint) was injected at bilateral “ST 36” of the model rats one hour before electroacupuncture, while GW4869 (with a concentration of 3?mg/mL, 50µL/acupoint) was injected at bilateral ST 36 of the model rats one hour before electroacupuncture in Group GW4869?+?EA. The paw withdrawal latency (PWL) was used as the therapeutic effect index.

Results

The PWL of rats in each group at Hour 24 after modeling was significantly lower than that before modeling, indicating that the models were successfully established. After the electroacupuncture treatment, the PWL of rats showed an increasing trend in all groups. The PWL of Group GW4869?+?EA (6.74?±?1.09)s was lower than that of Group EA (7.72?±?1.54)s on Day 1 after injection, but the difference was not statistically significant (P?>?0.05). The PWL values of Group GW4869?+?EA (7.72?±?0.70)s, (7.87?±?0.58)s were significantly lower than those of Group EA (9.96?±?0.94)s, (9.66?±?0.96)s (both P?<?0.05) on Days 2 and 3 after injection, and the differences were statistically significant.

Conclusion

It was preliminarily found that acupuncture analgesic effect was significantly reduced after local exosomes of acupoints were blocked, indicating that local exosomes of acupoints may be involved in the initiation process of acupuncture effect.  相似文献   

15.
目的:采用流化床制粒法以糊精为辅料制备了泽泻汤颗粒,研究其水分吸附和扩散特征。方法:采用粒径、扫描电镜法(SEM)、差示扫描量热法(DSC)和傅里叶变换红外光谱法(FTIR)对泽泻汤颗粒进行表征,采用饱和盐溶液法测定泽泻汤颗粒的吸湿等温线、平衡吸湿量、水分扩散系数和扩散能量。 结果:粒径大小从6.04 μm(泽泻汤浸膏粉)增加到 1201.47 μm(泽泻汤颗粒);糊精、泽泻汤浸膏粉和泽泻汤颗粒的玻璃态转变温度(Tg)分别为107.13 ℃, 94.82 ℃和126.25 ℃。制粒后,泽泻汤颗粒的平衡吸湿量和水分扩散系数均显著降低(p<0.01),临界相对湿度和水分扩散能量均高于泽泻汤浸膏粉,能量壁垒的提高阻碍水分在颗粒中的扩散。结论:以糊精为辅料进行流化床制粒能够降低泽泻汤浸膏粉的吸湿性,抑制水分扩散,这可能与流化床制粒改变颗粒的微观组织结构和糊精的抗塑化作用有关。  相似文献   

16.

Objective

To explore influence of electroacupuncture (EA) therapy of tonifying the kidney and regulating governor vessel on amyloid beta (Aβ) related degradation enzymes in the hippocampus of a rat model of Alzheimer's disease (AD) induced by Aβ1-42.

Methods

Forty Wistar male rats were randomly divided into 4 groups: a normal group, a sham operation group, a model group and an EA group, 10 rats in each one. The rats in normal group were normally fed. The rats in sham operation group were bilaterally injected in the hippocampus with 5 µL of saline and they were normally fed after the injection. The rats in the model group and the EA group were bilaterally injected in the hippocampus with 5 µL of Aβ1-42 on each side. Rats in the EA group received EA of 5?Hz continuous wave at the “B?ihuì (百会 GV20)” and bilateral “Shènshū (肾俞 BL23)” for a duration of 15 min per time every day and continuously for 15 days. After 15 days, the hippocampal expression levels of insulin degrading enzyme (IDE), lipoprotein (LPL), transthyretin (TTR), apolipoprotein E (APoE), α2 macroglobulin (α2M) and Aβ1-42 of the 4 groups were tested by Western blot.

Results

Compared with the sham operation group, the expression levels of IDE, LPL, TTR, APoE and α2M in the hippocampus were significantly lower (P?<?0.05, P?<?0.01) and the expression of Aβ1-42 was significantly higher(P?<?0.01) in the model group. Compared with the model group, the expression levels of IDE, LPL, TTR, APoE and α2M in the hippocampus of these rats were significantly lower (P?<?0.05, P?<?0.01), the expression of Aβ1-42 was significantly higher(P?<?0.01) in the EA group.

Conclusion

EA therapy of tonifying the kidney and regulating governor vessel can enhance the expression of IDE, LPL, TTR, APoE, and α2M in the hippocampus of AD rats injected by Aβ1-42, and may consequently promote the degradation of aβ1-42 to help improve the pathological manifestations of AD and therefore delay its progression.  相似文献   

17.

Objective

To explore the tenderness response at the acupoints on the medial crus in the patients of pelvic inflammatory disease.

Methods

A total of 30 patients of pelvic inflammation and 30 healthy people were included. WAGNER FDX body mechanics algometer was used to determine the score of the visual analogue scale (VAS) and tenderness threshold value at Yīnlíngquán (阴陵泉 SP 9), Sānyīnjiāo (三阴交SP 6) and Lígōu (蠡沟 LR 5). The changes in the tenderness on the body surface at the relevant acupoints were compared and analyzed in the patients of pelvic inflammation.

Results

The occurrence rate of tenderness at LR 5 at the pelvic inflammation group was higher significantly than the health group (86% Vs 42%, P<0.01). In SP 9, SP 6 and LR 5,the VAS scores at the acupoints in the pelvic inflammation group were higher significantly than the health group (test 1:55.00?±?15.12 vs 27.25?±?10.31, 47.07?±?18.38 vs 29.75?±?14.30, 47.16?±?19.4 vs 20.16?±?10.76; test 2:53.40?±?17.23 vs 33.42?±?13.07, 45.95?±?15.74 vs 29.15?±?11.97, 42.50?±?21.67 vs 21.05?±?11.97; test 3: 48.50?±?14.97 vs 40.08?±?13.20, 38.24?±?15.29 vs 29.29?±?12.37, 37.93?±?19.17 vs 23.09?±?12.26) , P?<?0.01, P?<?0.05 .In SP 9, SP 6 and LR 5,the tenderness threshold values at the acupoints in the pelvic inflammation group were higher significantly than the health group (test 1:0.86?±?0.95 vs 0.53?±?0.39, 0.86?±?0.95 vs 0.53?±?0.39, 0.85?±?0.77 vs 0.47?±?0.47; test 2:0.88?±?0.81 vs 0.44?±?0.32, 0.98?±?0.83 vs 0. 44?±?0. 32, 0.85?±?0.77 vs 0.47?±?0.47; test 3:0.98?±?0.80 vs 0.36?±?0.26, 1.11?±?0.92 vs 0. 36?±?0. 26, 0.85?±?0.77 vs 0.47?±?0.47), P?<?0.01, P?<?0.05 (P?<?0.05).

Conclusion

The VAS scores and tenderness threshold values at SP 9, SP 6 and LR 5 in the patients of pelvic inflammation are higher significantly than those in the healthy people. The occurrence rate of tenderness at LR 5 is higher significantly as compared with the healthy people.  相似文献   

18.

Objective

To observe the clinical effects on simple obesity treated with the combined therapy of penetration needling, flash-fire cupping method and auricular acupuncture.

Methods

In 90 patients of simple obesity, the Bo's abdominal acupuncture therapy was adopted. Taking Shénquè (神阙 CV 8), the points 2 cun directly below CV 8 and 2 cun directly above CV 8 as the landmarks, 3 cun bilateral to each of the above three points, and penetrated through to the conception vessel. Then the electroacupuncture apparatus was connected, with the disperse-dense wave for 30?min. After acupuncture, the glass cup of the middle size was used to stimulate the selected points with the flash-fire cupping method. The cupping stimulation stopped when the skin turned to be slightly red. One treatment was given each day and every other day after 5 days. The 10 treatments made one course. In the auricular acupuncture therapy, Jīdi?n (饥点), Shénmén (神门TF4), Nèifēnmì (内分泌CO18) and Sānjiāo (三焦 CO17) were selected. The auricular acupuncture therapy was given once every two days and 10 treatments made one course. After 3 courses of treatment, the waist circumference, hip circumference, body weight and body mass index (BMI) were observed.

Results

Compared to before treatment, after 3 courses of treatment, the waist circumference of patients was (92.3?±?2.4?vs 80.4?±?2.3) cm, hip circumference (110.6?±?2.3?vs 99.2?±?2.5) cm, body weight (74.2?±?3.1?vs 68.2?±?2.4) kg and BMI (29.8?±?3.1?vs 25.2?±?2.1), they were all reduced obviously, indicating the significant differences (all P?<?0.05). Seventy-nine patients lost three to five kilograms, accounting for 87.8%.

Conclusion

The combined therapy of penetration needling at abdomen, flash-fire cupping method and auricular acupuncture achieves the significant therapeutic effects on simple obesity.  相似文献   

19.
Objective: To study the constituents from the whole plants of Gentianella acuta and their biological activities.Methods: The compounds were isolated by multiple chromatographic methods and the structures of mentioned isolates were determined by routine NMR experiments and chemical methods.Results: A phytochemical investigation to obtain intestine motility inhibitor resulted in the isolation of one new xanthone glycoside,gentixanthonoside A(1),along with nine tetrahydroxanthones,1,3,5R,8S-tetrahydroxy-5,6,7,8-tetrahydroxanthone(2),1,3,5S,8S-tetrahydroxy-5,6,7,8-tetrahydroxanthone(3),amarellin E(4),amarellin F(5),swertiachoside B(6),amarellin D(7),amarellin C(8),amarellin A(9),and amarellin B(10)from the whole plants of G.acuta.Conclusion: Compounds 2 –10 showed significant reduce effects on contraction tension at 40 μM.  相似文献   

20.
Objective:Mosquitoes are the major transmitting vectors of serious human diseases,causing millions of deaths every year with undesirable effects,including toxicity to non-target organisms.Some plants with insecticidal properties have been used in recent years for the control of a variety of pest insects and vectors.In the quest for alternative natural biological control agents against mosquito larvae lichens were selected.Method:Larvicidal activity was assessed with methanolic extracts of Parmotrema reticulatum,Parmotrema kamatti,Parmotrema tinctorum,Parmelia erumpens,Leptogium papilosum,and Roccella montagnei against Aedes aegypti,Anopheles stephensi,and Culex quinquefasciatus.The standard WHO protocols with minor modifications were adopted and the bioassay was evaluated at the concentrations of 100–500μg/m L for each lichen.Since all the lichen extracts showed complete mortality against C.quinquefasciatus in100μg/m L,the concentrations were decreased to 100,50,25,12.5,and 6.25μg/m L for C.quinquefasciatus.Larval mortality was observed for 24 h after treatment.Results:All the lichen extracts exhibited activity against third instar larvae of A.aegypti and A.stephensi at 100μg/m L,and 100%mortality was observed against the vector C.quinquefasciatus at 100μg/m L.The highest larvicidal activity was found with L.papilosum against A.aegypti(81.127μg/m L)and A.stephensi(89.10μg/m L).Similarly,P.tinctorum and R.montagnei when tested against C.quinquefasciatus with minimum concentration100μg/m L exhibited significant activity withof 5.32and 6.97μg/m L.Conclusion:The bioassay results revealed larvicidal potential of lichens especially against C.quinquefasciatus with high mortality even at lower concentration.Hence,lichens can be used as an ideal sustainable approach for the control of lymphatic filariasis caused by vector C.quinquefasciatus.  相似文献   

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