Extractive from Rauvolfia verticillata (Lour.) Baill. var. hainanensis Tsiang ameliorate ulcerative colitis in Dextran Sodium Sulfate-induced Mice via regulating the MAPK pathway

Objective: To investigate the effect and mechanism of Rauwolfia verticillata (Lour.) Baill. var. hainanensis Tsiang extract on mice with colitis induced by Dextran sulphate sodium (DSS). Methods: 80 BALB/C mice were randomly divided into (1) normal control group, (2) DSS group, (3) DSS + SASP treatment group, (4) DSS + PP treatment group. After the experiment, the mice in each group were observed daily general conditions, Immunohistochemistry was used to detect the expression of ERK, p38 MAPK and JNK protein in colonic mucosa of mice in each group. The expression of TNF-_and IL-6 cytokines in colonic tissue of mice was detected by ELASA. Results: The general situation of SASP group and PP group was better than DSS group;Compared with DSS group, the expression of ERK, p38 MAPK and JNK protein was significantly decreased. The levels of TNF-a and IL-6 in colon tissue of SASP group and PP group were significantly decreased. Conclusion: The results suggest that pectin polysaccharide from Rauvolfia hainanensis extract has a significant therapeutic effect on colitis in DSS mice, which may via regulating the MAPK signal pathway pathways.

响应面试验优化超声辅助提取萝芙木中育亨宾工艺

以广西产萝芙木为原料,采用响应面法优化超声波辅助提取育亨宾的工艺条件。在单因素试验基础上,选取粒度、提取液p H值、提取时间、液料比作为自变量,以育亨宾提取量为响应值,利用Box-Behnken设计和响应面分析法,研究各自变量交互作用对育亨宾提取量的影响,模拟得到二次多项式回归方程模型。超声波辅助提取萝芙木中育亨宾的最优工艺条件为:粒度120目、液料比(溶液体积与干药材质量比)18∶1(m L/g)、提取液p H 1、提取时间59.75 min。在此条件下育亨宾实测平均提取量为3.841 mg/g,与模型的预测值3.903 8 mg/g基本吻合,说明响应面优化所得参数可靠,可用于指导实际生产。

加速溶剂萃取(ASE)技术提取海南萝芙木活性成分

考察了加速溶剂萃取(ASE)技术对海南萝芙木抗氧化活性成分的提取效果。以提取物对DPPH自由基的清除率为指标,确定水-丙酮混合溶剂为最佳溶媒,通过正交实验确定了最佳提取条件,即样品经质量分数1%的盐酸预处理30 m in后,以V(丙酮)∶V(水)=1∶1为溶媒,在125℃用加速溶剂萃取仪提取,所得提取物对DPPH自由基的清除率为89.378%,而索式提取法仅为68.45%。表明加速溶剂萃取技术可以作为萝芙木中活性成分的一种高效提取手段。

海南萝芙木提取物对DSS小鼠结肠炎MAPK信号通路的影响

目的:探讨海南萝芙木(Rauvolfia verticillata(Lour.)Baill.var.hainanensis Tsiang)提取物果胶多糖(pectic polysaccharides,PP)对葡聚糖硫酸钠(dextran sulphatesodium,DSS)小鼠结肠炎的作用及机制。方法:80只BALB/C小鼠随机分为4组:(1)正常对照组;(2)DSS组;(3)DSS+柳氮磺胺吡啶(SASP)治疗组;(4)DSS+PP治疗组。实验结束后,观察各组小鼠每日一般情况。剖取各组小鼠结肠炎症组织,免疫组织化学检测法检测各组小鼠结肠黏膜组织中丝裂原活化蛋白激酶信号通路的关键酶细胞外调节蛋白激酶(ERK)、P38丝裂原活化蛋白激酶(p38 MAPK)和c-Jun基末端激酶(JNK)蛋白表达情况,酶联免疫吸附实验(ELISA)方法检测定小鼠结肠组织肿瘤坏死因子α(TNF-ɑ)、白介素-6(IL-6)细胞因子表达情况。结果:SASP治疗组和PP治疗组小鼠一般情况优于DSS组;与DSS组相比,ERK、p38 MAPK和JNK蛋白表达明显下调;SASP治疗组和PP治疗组结肠组织中TNF-α、IL-6水平均显著降低。结论:提示海南萝芙木提取物果胶多糖对DSS小鼠结肠炎有显著治疗作用,其可能是通过干预MAPK信号通路发挥此作用。

萝芙木内生真菌Colletotrichum acutatum的次级代谢产物研究

目的 对萝芙木内生真菌Colletotrichum acutatum中抗肿瘤活性次级代谢产物进行研究。方法 结合LC-MS分析与MTT活性检测方法,采用反相ODS、反复硅胶柱色谱及高效液相色谱等方法对活性次级代谢物进行分离纯化,并根据理化性质与波谱数据鉴定化合物结构。结果与结论从萝芙木内生真菌总次级代谢物中分离得到11个化合物,分别鉴定为alternariol 4-methl ether(1)、fusaproliferin(2)、对苯二甲酸二丁酯(3)、nectriapyrone(4)、heptadec-(9Z)-enoic acid(5)、bis-2-ethylhexyl-benzene-1,2-dicarboxylate(6)、psoralester(7)、1-linoleoylglycerol(8)、9-octadecenoic acid-2′,3′-dihydroxy propyl ester(9)、rigidiusculamide C(10)、sambutoxin(11)。其中除化合物4以外,其他化合物均为首次从内生真菌Colletotrichum属中分离得到,化合物3、7、8、11对肺癌细胞株A549和宫颈癌细胞株HeLa具有中等细胞毒性(IC_(50)≤50μmol·L^(-1))。