皖贝母产生物碱内生真菌的筛选与鉴定

目的：从皖贝母中分离产生物碱的内生真菌。方法：采用组织块法、薄层层析、高效液相色谱-旋转蒸发光检测器法以及形态学和分子生物学方法从皖贝母鳞茎中筛选出产生物碱的内生真菌。结果：从皖贝母中分离出1株产生物碱的内生真菌,并鉴定为极细链格孢菌（Alternaria tenuissima）。结论：从皖贝母中分离到了一株产生物碱内生真菌bm-2 ,为解决皖贝母药用资源匮乏的问题提供理论依据。     

马钱子总生物碱树脂微囊分散片的处方确定

目的：确定马钱子总生物碱树脂微囊分散片的最佳处方.方法：以不同处方比例制备分散片,以分散片的外观、片重、硬度、崩解时限、分散均匀性及溶出度等作为考察指标,采用正交设计法分析筛选最优处方.结果：最佳分散片处方为微晶纤维素为填充剂,交联聚乙烯吡咯烷酮和碳酸氢钠与枸橼酸为联合崩解剂,卡波姆和羧甲基纤维素钠联合应用为助悬剂,滑石粉为润滑剂.结论：马钱子总生物碱树脂微囊分散片的外观、片重差异、崩解时限、分散均匀性、含量等均符合2010年版《中国药典》要求.     

HPLC法测定苦参生物碱部位中4种成分含量

目的建立苦参生物碱部位中4种成分氧化苦参碱、氧化槐果碱、苦参碱和槐果碱的HPLC含量测定方法。方法采用Agilent Zorbax C18柱(4.6 mm×150 mm,5μm),系统A为10 mmol/L醋酸铵水溶液(0.1%氨水,pH=9.2),系统B为20 mmol/L醋酸铵的甲醇-乙腈(1∶1)混合溶液,梯度洗脱,洗脱流速为0.8 mL/min,检测波长220 nm。结果氧化苦参碱、氧化槐果碱、苦参碱、槐果碱平均回收率分别为101.43%、99.08%、102.59%和102.06%,RSD分别为1.30%、0.94%、1.69%和1.10%。结论3批样品测定结果表明,该方法简便、准确,可用于苦参生物碱部位中4种生物碱成分的含量测定。     

Cocktails of Mycotoxins,Phytoestrogens, and Other Secondary Metabolites in Diets of Dairy Cows in Austria: Inferences from Diet Composition and Geo-Climatic Factors

Dairy production is a pivotal economic sector of Austrian and European agriculture. Dietary toxins and endocrine disruptors of natural origin such as mycotoxins and phytoestrogens can affect animal health, reproduction, and productivity. This study characterized the profile of a wide spectrum of fungal, plant, and unspecific secondary metabolites, including regulated, emerging, and modified mycotoxins, phytoestrogens, and cyanogenic glucosides, in complete diets of lactating cows from 100 Austrian dairy farms. To achieve this, a validated multi-metabolite liquid chromatography/electrospray ionization–tandem mass spectrometric (LC/ESI–MS/MS) method was employed, detecting 155 of >800 tested metabolites. Additionally, the most influential dietary and geo-climatic factors related to the dietary mycotoxin contamination of Austrian dairy cattle were recognized. We evidenced that the diets of Austrian dairy cows presented ubiquitous contamination with mixtures of mycotoxins and phytoestrogens. Metabolites derived from Fusarium spp. presented the highest concentrations, were the most recurrent, and had the highest diversity among the detected fungal compounds. Zearalenone, deoxynivalenol, and fumonisin B1 were the most frequently occurring mycotoxins considered in the EU legislation, with detection frequencies >70%. Among the investigated dietary factors, inclusion of maize silage (MS) and straw in the diets was the most influential factor in contamination with Fusarium-derived and other fungal toxins and metabolites, and temperature was the most influential among the geo-climatic factors.     

苦豆子总生物碱对小鼠乳腺癌4T1细胞体外增殖抑制及诱导凋亡作用的研究

目的研究苦豆子总生物碱对小鼠乳腺癌4T1细胞体外增殖抑制及诱导凋亡作用。方法苦豆子总生物碱提取并纯化,处理成澄清的药物溶液后用于细胞给药。CCK-8法测定不同浓度的苦豆子总生物碱作用24h后4T1细胞存活率。流式细胞术检测给药24h后4T1细胞凋亡率。结果与对照组比较,实验组药物浓度为5.00mg/mL时,4T1细胞存活率为63.05%;药物浓度为10.00mg/mL时,4T1细胞存活率为20.30%,随着给药浓度的增加,细胞存活率呈明显下降趋势。实验组药物浓度为6.25mg/mL时,细胞凋亡率为11.4%;药物浓度为10.00mg/mL时,细胞凋亡率为41.7%,随着给药浓度的增加,细胞凋亡率明显增加。结论苦豆子总生物碱能诱导细胞凋亡,对小鼠乳腺癌4T1细胞的增殖有明显抑制作用。     

野罂粟生物碱单体心血管效应的构效关系

目的：观察野罂粟总生物碱中八种生物碱单体心血管应的构效关系。方法：采用离体实验观察单体对ＫＣｌ所致兔胸主动脉环收缩的影响,并以Ｖｅｒ 作对照。结果：野罂粟碱（ｎｕｄｉｃａｕｌｉｎｅ,Ⅰ）、瑞芙热米定（ｒｅｆｒａｍ ｉｄｉｎｅ,Ⅱ）、黑龙辛甲醚（ａｍ ｕｒｅｎｓｉｎｉｎｅ,Ⅳ）、黑龙辛（ａｍ ｕｒｅｎｓｉｎｅ,Ⅴ）、野罂粟醇（ａｍ ｕｒｏｌｉｎｅ,Ⅵ）和七号生物碱（Ⅶ）均可使ＫＣｌ量－ 效曲线不平行右移,最大反应压低,其ＩＣ５０分别为０．２０,０．８０,０．１６,０．６０,０．６０,０．１６ｍ ｍ ｏｌ·Ｌ－ １。结论：野罂粟碱类（Ⅱ,Ⅳ,Ⅴ,Ⅶ）对经ＰＤＣ钙内流抑制效果较强,其中以Ⅱ作用最强;原阿朴菲类（Ⅵ,ⅧＡ,Ｘ）的抑制作用较弱     

单味中药抑制胃癌细胞株体外增殖作用的实验研究进展

胃癌是我国最常见的恶性肿瘤之一,传统中医药治疗肿瘤具有低毒、有效、价廉等特点,成为筛选胃癌防治药物的较理想研究领域。本文按照单体、单味中药提取的有效成分的分类将近几年来单味中药抑制人胃癌细胞株体外增殖作用的实验基础研究近况做一综述,为进一步的相关研究提供参考依据及确定方向,从而筛选出疗效肯定有应用前景的中药有效成分(或单体),充分发挥中药作用范围广、副作用小的优势,使中医药在治疗胃癌方面发挥更大的作用。     

泰山产草乌中总生物碱的提取工艺研究

目的研究乌头总生物碱的提取工艺,优化得到乌头总生物碱的最佳提取工艺条件。方法分别采用回流法、索氏法、碱化索氏法、超声波法4种提取方法提取乌头总生物碱,根据正交实验的得率,优化乌头总生物碱的提取工艺条件;结果碱化索氏法提取为最佳方法,最佳提取条件是提取溶剂氯仿,体积为250 m l,提取时间为5h。结论碱化索氏法提取具有提取时间短、产率高、简单等优点。     

Visible Light Curable Restorative Composites for Dental Applications Based on Epoxy Monomer

A cationic photo-curable cycloaliphatic epoxy resin has been investigated as reactive monomer in blue light crosslinking process. We have demonstrated that camphorquinone is able to abstract labile hydrogen from the epoxy monomer, giving rise to the formation of carbon-centered radicals that are oxidized by the onium salt; a complete epoxy group conversion was reached after 50 s of irradiation. The presence of water up to 1 wt% was tolerated without any important detrimental effect on the kinetics of light-curing. The presence of the inorganic filler up to 65 wt% did not significantly influence the curing process.     

Indole alkaloid sulfonic acids from an aqueous extract of Isatis indigotica roots and their antiviral activity

Six new indole alkaloid sulfonic acids (1–6), together with two analogues (7 and 8) that were previously reported as synthetic products, were isolated from an aqueous extract of the Isatis indigotica root. Their structures including the absolute configurations were determined by spectroscopic data analysis, combined with enzyme hydrolysis and comparison of experimental circular dichroism and calculated electronic circular dichroism spectra. In the preliminary assay, compounds 2 and 4 showed antiviral activity against Coxsackie virus B3 and influenza virus A/Hanfang/359/95 (H3N2), respectively.