苏木种子的二萜类化学成分研究

目的 研究苏木Caesalpinia sappan种子的化学成分。方法 采用柱色谱技术对苏木种子的95%甲醇提取物进行分离纯化,采用波谱技术结合化学方法进行结构鉴定。结果 从苏木种子提取物中分离得到了15个化合物,包括13个卡山烷型二萜类化合物,分别鉴定为caesaldekarin K(1)、demethylcaesaldekarin C(2)、taepeenin H(3)、taepeenin I(4)、caesalpinista A(5)、caesalpinista B(6)、cordylane C(7)、deoxycaesaldekarin C(8)、phanginin A(9)、phanginin B(10)、phanginin C(11)、phanginin D(12)、phanginin E(13)及β-谷甾醇(14)、β-胡萝卜苷(15)。结论 化合物1~8、14~15为首次从该植物中分离得到。     

苏木提取物及其单体成分抗排斥反应的研究进展

苏木(Caesalpinia sappan L.)为豆科云实属植物,其干燥心材为传统中药材.苏木不同提取物及其单体成分均有一定的抗排斥反应作用,但由于提取方式及其单体成分的不同,其抗排斥反应的强度及作用机制也存在着差异.苏木及其单体化合物将在自身免疫性疾病和异体移植等免疫排斥反应性疾病方面拥有广阔的前景.     

苦石莲皮和仁中挥发性成分对比研究

目的:对比苦石莲皮和仁中挥发性成分。方法:利用有机溶剂-水蒸气蒸馏法提取苦石莲挥发油,用GC-MS进行测定,色谱柱为HP-5MS5%Phenyl Methyl Siloxane弹性石英毛细管柱(30m×0.25mm×0.25μm),结合计算机检索技术对分离的化合物进行结构鉴定,应用色谱峰面积归一化法计算各成分的相对百分含量。结果:苦石莲皮中分离出115个化学成分,鉴定出63个化学成分,占总挥发性成分的54.7%,其中相对百分含量大于2.0%有5种;苦石莲仁中分离出102个化学成分,鉴定出51个化学成分,占总挥发性成分的50.0%,其中相对百分含量大于2.0%有7种。苦石莲皮和仁挥发性成分中有40种相同成分,其中皮中含量最高的是柠檬烯(5.31%),仁中含量最高的是己醇(12.94%)。结论:本实验首次对苦石莲皮和仁挥发性成分进行对比研究。为有效控制苦石莲药材质量及深度开发该药材提供参考数据。     

苦石莲提取物抗炎镇痛作用的实验研究

目的 观察苦石莲不同提取物的抗炎镇痛作用.方法 用二甲苯致小鼠耳肿胀法和角叉菜胶致大鼠足肿胀法研究抗炎作用,用热板法和扭体法研究镇痛作用.结果 苦石莲醇提取物8 g/kg、氯仿提取物4,8 g/kg对小鼠二甲苯致耳肿胀及角叉菜胶致大鼠足肿胀有抑制作用;苦石莲醇提取物4,8 g/kg、氯仿提取物4,8 g/kg能减少冰乙酸致小鼠扭体次数和提高热板致痛小鼠痛阈值.结论 苦石莲具有显著的抗炎和镇痛作用.     

Folin-酚法测定苏木中总酚含量

采用比色法，以苏木精为标准品，分析测定了苏木中的总酚含量，结果表明，总酚含量在0～6μg／ml范围内呈良好的线性关系，回归方程A=0．14608C＋0．03210，相关系数为r=0．99932，检出限为0．15μg／ml，加样回收率为98．77％102．4％，RSD为2．37％，为进一步开发研究苏木中的药效成分提供了依据。     

Effects of brazilin on the phospholipase A2 activity and changes of intracellular free calcium concentration in rat platelets

Brazilin {7,11 b-dihydrobenz[b]indeno[1,2-d]pyran-3,6a,9,10(6H)-tetrol} inhibited thrombin-, collagen-and ADP-induced aggregation of washed rat platelets. Thrombin- and collagen-induced ATP release were also inhibited by brazilin in a concentration-dependent manner. Brazilin inhibited the formation of platelet thromboxane A₂ caused by thrombin, whereas it had no effect on the prostaglandin D₂ formation. Brazilin inhibited [³H]-arachidonic acid liberation from membrane phospholipids of thrombin-stimulated platelets. Brazilin inhibited the rise of intracellular free calcium caused by thrombin. These results indicate that the inhibition of phospholipase (PLA₂) activity and [Ca²⁺]_i elevation might be at least a part of antiplatelet mechanism of brazilin.     

南蛇勒蛋白对黑色素瘤细胞的抑制及分化作用

目的从南蛇勒中分离纯化具有抑制黑色素瘤作用的蛋白质———南蛇勒蛋白 (CMP) ,并对黑色素瘤细胞KI735M2增殖的抑制及细胞的分化进行研究。方法采用盐析、凝胶色谱的方法对CMP进行分离纯化 ,溴化四唑蓝法检测CMP对黑色素瘤细胞KI735M2增殖的抑制作用的量效和时效关系 ,形态学观察法检测细胞的分化。结果CMP相对分子质量为 1980 0 ,2 2 .0 μg/mlCMP抑制黑色素瘤细胞增殖 6 0 % (P <0 .0 5 ) ,使细胞增殖第 5天处于停顿 ,抑制率为 96 % (P <0 .0 5 ) ,不同浓度的CMP使黑色素瘤细胞形成具有分化特征的树突状结构。结论CMP对黑色素瘤细胞KI735M2的增殖具有抑制作用。     

A new homoisoflavan from Caesalpinia sappan

A new homoisoflavan, 7,3′,4′-trihydroxy-3-benzyl-2H-chromene (1), was isolated from the dried heartwood of Caesalpinia sappan L., together with seven known phenolic compounds. The structure of the new compound (1) was determined on the basis of spectroscopic analysis.     

Immunomodulatory activities of the ethanolic extract of Caesalpinia bonducella seeds

Caesalpinia bonducella FLEMING (Caesalpiniaceae) is a plant well known for its medicinal value in Indian Ayurveda. However, to prove its efficiency for the clinical utilization, more experimental data will be beneficial.

Aims of the study

The present study involved the investigation of immunomodulatory activities of ethanolic extract of Caesalpinia bonducella seeds.

Materials and methods

Neutrophil adhesion test, haemagglutinating antibody (HA) titre, delayed-type hypersensitivity (DTH) response, phagocytic activity and cyclophosphamide-induced myelosuppression were determined by in vivo experiments.

Results

The evaluation of immunomodulatory potential by oral administration of ethanolic seed extract of Caesalpinia bonducella (200–500 mg/kg) evoked a significant increase in percent neutrophil adhesion to nylon fibers as well as a dose-dependent increase in antibody titre values, and potentiated the delayed-type hypersensitivity reaction induced by sheep red blood cells. Also it prevented myelosuppression in cyclophosphamide drug treated rats and good response towards phagocytosis in carbon clearance assay.

Conclusions

The results obtained in this study indicate that Caesalpinia bonducella possesses potential immunomodulatory activity and has therapeutic potential for the prevention of autoimmune diseases.     

Antioxidant activity of Caesalpinia digyna root

The antioxidant properties of three successive extracts of Caesalpinia digyna Rottler root and the isolated compound, bergenin, were tested using standard in vitro and in vivo models. The amount of the total phenolic compounds present was also determined. The successive methanol extract of Caesalpinia digyna root (CDM) exhibited strong scavenging effect on 2,2-diphenyl-2-picryl hydrazyl (DPPH) free radical, 2,2′-azino-bis(3-ethylbenzo-thiazoline-6-sulphonic acid) diammonium salt (ABTS) radical cation, hydrogen peroxide, nitric oxide, hydroxyl radical and inhibition of lipid peroxidation. The free radical scavenging effect of CDM was comparable with that of reference antioxidants. The CDM having the highest content of phenolic compounds and strong free radical scavenging effect when administered orally to male albino rats at 100, 200 and 400 mg/kg body weight for 7 days, prior to carbontetrachloride (CCl₄) treatment, caused a significant increase in the levels of catalase (CAT) and superoxide dismutase (SOD) and significant decrease in the levels of lipidperoxidation (LPO) in serum, liver and kidney in a dose dependent manner, when compared to CCl₄ treated control. These results clearly indicate the strong antioxidant property of Caesalpinia digyna root. The study provides a proof for the ethnomedical claims and reported biological activities. The plant has, therefore, very good therapeutic potential.