共查询到20条相似文献,搜索用时 171 毫秒
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Ji花叶中丹宁及绿原酸季节性变化分析 总被引:2,自引:0,他引:2
本文利用正相与反相HPLC方法对Ji花叶中丹宁与绿原酸季节性变化规律作了分析,结果表明:丹宁的种类在当年6月至次年2月间几无变化,而绿原酸的含量在这一期间呈明显逐渐上升趋势。这一结果为合理开发Ji花叶药用资源提供了科学依据。 相似文献
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科学研究表明,约有1/3的癌症与不良的饮食习惯有关,科学地饮食可以防止癌症的发生。近年来,国内外医学家、营养学家对食物所含的抗癌物质进行了广泛深入的研究,为食物防癌抗癌提供了科学依据。研究证实,下列食物具有防癌抗癌功效,宜经常轮流食用。 相似文献
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植物中新的木脂素类化合物及其生物活性 总被引:2,自引:0,他引:2
木脂素是一类基本结构由苯丙素组成的多聚体,具有广泛的生物活性,其抗癌活性已引起国内外学者的广泛关注。对近年来从植物中获得的新的木脂素类化合物,从化学结构分类方面进行了综述,并简要介绍了部分化合物的生物活性。 相似文献
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朱砂根为紫金牛科紫金牛属植物朱砂根Ardisia crenata Sims的根.性味苦辛、凉,具有清热解毒、散瘀止痛的作用.用于治疗心胃气痛、风湿骨痛、跌打损伤等症[1].现代药理研究发现朱砂根中的三萜皂苷类化合物具有较强的抗癌活性,百两金皂苷A和B是从朱砂根中分离得到的主要抗癌活性化合物[2],其化学结构已经通过理化方法结合光谱分析得到了确认.本实验对百两金皂苷A和B进行微生物转化研究,期望能够得到具有很强活性和高选择性的抗癌化合物,同时为三萜皂苷类化合物微生物转化研究奠定实验基础. 相似文献
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目的对乙肝宁药材中的鞣质提取分离测定;测定鞣质的吸湿率及临界相对湿度(CRH),并考察壳聚糖对鞣质的絮凝作用。方法采用改进的2010版《中国药典》鞣质含量的测定方法,即磷钼钨酸-干酪酸比色法,以没食子酸为对照测定;采用过饱和溶液法,测定鞣质吸湿时间曲线;根据25℃不同湿度条件下的吸湿平衡曲线测定其临界相对湿度;采用比色法测定壳聚糖对鞣质的絮凝作用。结果乙肝宁药材水浸提鞣质含量<1%,鞣质有一定的吸湿性,CHR为66.8%,壳聚糖能显著絮凝吸附鞣质。结论壳聚糖对乙肝宁颗粒的吸湿性影响与鞣质有关。 相似文献
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Antihepatotoxic actions of tannins 总被引:1,自引:0,他引:1
The antihepatotoxic effects of tannin analogues were examined utilizing carbon tetrachloride- and galactosamine-induced cytotoxicity in primary cultured rat hepatocytes. Most tannins showed significant antihepatotoxic effects in these two assay systems. Hydrolyzable tannins generally exhibited an intense enzyme inhibitory action on glutamic-pyruvic transaminase while condensed tannins exerted a much less inhibitory action, although variations were observed depending on structure. Structure-activity relationships are discussed. 相似文献
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平榛鞣质成分研究(Ⅲ) 总被引:1,自引:0,他引:1
目的研究黑龙江省榛(平榛)Corylusheterophylla的鞣质成分。方法利用大孔树脂柱色谱分离纯化技术反复分离纯化,通过1H-NMR、13C-NMR、FAB-MS、1H-1HCOSY等光谱手段及化学方法对得到的单体成分进行结构鉴定。结果从该植物叶中分离得到3个鞣质成分榛叶鞣质D(Ⅰ)、刺梨素A(Ⅱ)、玫瑰素F(Ⅲ)。结论榛叶鞣质D(Ⅰ)为一新的二聚体鞣质成分。 相似文献
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掌叶大黄鞣质类化学成分研究 总被引:4,自引:2,他引:2
目的研究掌叶大黄Rheum palmatum根中鞣质类化学成分。方法采用硅胶柱色谱、中压柱色谱及半制备高效液相色谱等多种色谱分离方法对鞣质类成分进行分离,根据波谱数据分析鉴定化合物结构。结果从掌叶大黄的70%乙醇提取物中分离得到4个鞣质类化合物,分别鉴定为3-O-桂皮酰基-1-O-没食子酰基-β-D-葡萄糖苷(1)、2-O-桂皮酰基-1-O-没食子酰基-β-D-葡萄糖苷(2)、2-O-桂皮酰基-1,6-O-二没食子酰基-β-D-葡萄糖苷(3)、6-O-桂皮酰基-1-O-没食子酰基-β-D-葡萄糖苷(4)。结论化合物1为新化合物,命名为掌叶大黄苷。 相似文献
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《结合医学学报(英文版)》2020,18(2):92-113
Cancer is a leading cause of death globally, while malaria is the leading cause of death from parasitic diseases in Nigeria. Historically, plant remedies have been used to manage both cancer and malaria. Interestingly, the possibility of treating cancer with antimalarial remedies has long been reported, even though the two diseases appear to have little in common. However, a body of research has indicated the potential anticancer activity of both synthetic and nature-derived antimalarials. In Nigeria, over 100 plants are used for the management of malaria, but little is known for their potential role in combatting cancer. Therefore, this review is to highlight the documented anticancer activities of plants used to treat malaria in Nigeria, with the goal of supporting anticancer drug discovery. Scientific databases were used to search for antimalarial plants using selected keywords. Of over 100 plants used to treat malaria in Nigeria, 56 have documented anticancer properties, containing alkaloids, flavonoids, tannins, terpenes, terpenoids, quinones, anthraquinones, saponins, steroids, sterols, organosulfur compounds and other polyphenols as the major bioactive components. The major mechanisms of anticancer activity include induction of apoptosis and autophagy, arrest of cell growth, generation of reactive oxygen species and inhibition of angiogenesis. However, mechanistic and clinical investigations of the anticancer properties of most of these plants are still lacking. Notwithstanding, the huge anticancer potential uncovered by the in vitro or in vivo studies and a few clinical studies, Nigerian antimalarial plants may provide a valuable resource, ready to be harnessed for anticancer drug development. 相似文献
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Pithayanukul P Ruenraroengsak P Bavovada R Pakmanee N Suttisri R Saen-oon S 《Journal of ethnopharmacology》2005,97(3):527-533
Plant polyphenols from the aqueous extracts of Pentace burmanica, Pithecellobium dulce, Areca catechu and Quercus infectoria were tested for their inhibitory activities against Naja kaouthia (NK) venom by in vitro neutralization method. The first three extracts could completely inhibit the lethality of the venom at 4 LD50 concentration and the venom necrotizing activity at the minimum necrotizing dose while also inhibited up to 90% of the acetylcholinesterase activity of NK venom at much lower tannin concentrations than that of Quercus infectoria. The ED50 of plant tannins in inhibiting NK venom activities varied according to condensed tannins and their content in the extracts. Molecular docking of the complexes between alpha-cobratoxin and either hydrolysable or condensed tannins at their lowest energetic conformations were proposed. The anti-venom activities of these plant polyphenols by selectively blocking the nicotinic acetylcholine receptor and non-selectively by precipitation of the venom proteins were suggested. 相似文献
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刺玫果鞣质预防肿瘤作用研究 总被引:2,自引:0,他引:2
目的:研究刺玫果鞣质的预防肿瘤作用。方法:利用巴豆油致小鼠耳部急性肿胀实验,考察不同萃取层对肿胀度、肿胀抑制率的影响。结果:乙酸乙酯层与正丁醇层均有抑制肿胀作用;鞣质含量相同时,抑制肿胀程度强弱分别为乙酸乙酯层〉茶多酚〉正丁醇层;乙酸乙酯层最大抑制率为22.39%。结论:刺玫果鞣质可明显抑制小鼠耳肿胀,可能有预防肿瘤作用。 相似文献