Chiralcel OD-RH手性柱拆分卡维地洛对映体

采用Ch iralcelOD-RH(纤维素3,5-二甲基苯基氨基甲酸酯)手性固定相高效液相色谱法研究了乙腈-高氯酸钠缓冲盐体系对卡维地洛的手性拆分情况,讨论了流动相的各个因素(有机相的种类和比例、缓冲盐浓度、酸度等)对手性拆分的影响。在乙腈-高氯酸钠缓冲盐(pH 5.5,50 mmol/L)的体积比为35∶65的色谱条件下,卡维地洛对映体获得了基线分离。     

Ternary interpenetrating networks of polyurethane-poly(methyl methacrylate)-silica: Preparation by the sol–gel process and characterization of films

Novel organic/inorganic interpenetrating networks composed of polyurethane (PU), poly(methyl methacrylate) (PMMA) and silica generated from tetraethoxysilane (TEOS), were prepared by in situ bulk polymerization. Optically transparent films were successfully synthesized using 3-(trimethoxysilyl)propyl methacrylate (TMSPM) and isocyanatopropyl triethoxysilane (IPTES) as dual coupling agents. An experimental protocol was established to minimize undesirable side-reactions. According to infrared spectroscopic analysis and thermogravimetric studies of the hybrid materials, the degree of silica condensation was unfavorably affected by the presence of the organic components. Consequently, storage modulus (E′) at 25 °C, and hardness of the films decreased with increasing silica content.     

老年性白内障与微量元素

参阅有关老年性白内障的文献．归纳其病因有四种学说:(1)老化学说;(2)醌体学说;(3)微量元素学说;(4)中医学说．按病因学说不同．用药各异．目前治疗老年性白内障药物有滴眼剂及内服剂,其中有一种新药名为除障灵．它是根据中医学说及微量元素学说，筛选中药制成,它含有丰富的锌、硒、铜、镁等微量元素．应用除障灵治疗老年性白内障患者102例(204只眼)，观察6个月至2年，有效率达95％，开创了治疗老年性白内障的新方法．     

Practical synthesis of blepharismone,a mating inducing pheromone of Blepharisma japonicum

Both enantiomers of blepharismone, a mating inducing pheromone produced by type II cells of Blepharisma japonicum, were synthesized via the Stille cross-coupling reaction of [4-(tert-butyl-dimethyl-silanyloxy)-2-trimethylstannanyl-phenyl]-carbamic acid tert-butyl ester with an acid chloride derived from (S)- and (R)-malic acid as a key reaction. The mating inducing activity of synthetic (S)-blepharismone was as effective as that of the natural one. The enantiomer (R)-blepharismone showed no mating inducing activity.     

Structure identification of Euphorbia factor L3 and its induction of apoptosis through the mitochondrial pathway

In this article, we have focused on the structure identification of Euphorbia factor L3 belonging to the lathyrane diterpenoids isolated from Caper Euphorbia Seed. Its anticancer activity in vitro against lung cancer A549 cells was also investigated and the IC(50) values were 34.04 ± 3.99 μM. Furthermore, Euphorbia factor L3 could induce apoptosis in A549 cells via the mitochondrial pathway including loss of mitochondrial potential and release of cytochrome c.     

复发性阿弗他溃疡与相关的营养因素研究进展

以国内外研究复发性阿弗他溃疡营养因素的相关论文为依据,综述了近十年有关对复发性阿弗他溃疡（RAU）营养因素的研究进展。包括：RAU与微量元素锌、铁、硒、铜,维生素A、C、E、B2、B12,蛋白质,膳食纤维和谷类的关系。RAU的发生与体内微量元素锌、铁、硒、铜的减少,维生素A、C、E、B2、B12,蛋白质和膳食纤维的摄取不足密切相关,全谷类食品（功能稻米）对缓解RAU有帮助。     

双环烯醚的合成及其性质的研究

由内酯2和Tebbe试剂反应合成了双环烯醚化合物5-苄氧基-2,8-二亚甲基-3,4,9,10-四氢-2H,8H-苯并[1,2-b; 3,4-b']二吡喃(3), 环烯醚在酸性条件下很容易水解和异构化, 在酸存在下外环烯醚3于10 min内转化为内环烯醚4, 较长的反应时间只能得到水解物或其它分解产物.     

二甲基-β-环糊精作为手性选择剂对尼索地平对映体的毛细管电泳拆分研究

以二甲基-β-环糊精(DM-β-CD)为手性添加剂,用毛细管电泳法对消旋体药物尼索地平进行拆分研究。考察了二甲基-β-环糊精浓度、背景电解质种类、缓冲溶液pH值、十二烷基硫酸钠(SDS)浓度、分离电压、温度对对映体分离的影响。结果表明,以pH 8.0的30 mmol/L磷酸二氢钠-磷酸氢二钠溶液(含38mmol/L二甲基-β-环糊精,30 mmol/L SDS)为缓冲液,分离电压15 kV,毛细管温度18℃,检测波长254 nm时,尼索地平对映体达到最佳分离,分离度为1.95,对映体迁移时间分别为13.0、13.54 min。该方法简单、快速、经济,可用于尼索地平对映体的手性分离。     

Kinetic investigation of photopolymerization initiated by oligomeric photolatent base

Macrophotoinitiators often show polymer effect and photolatent bases make molecular amplification reaction. A main-chain oligomer containing α-aminoalkylphenone chromophore (OAK) had been synthesized with the characteristics of both photoinitiators and photolatent base hybrid structure. In order to determine whether such an effect or reaction exists in photopolymerization initiated by OAK, we used photo-differential scanning calorimeter to analyze the kinetic behavior. The experimental rate constants at different conversions were obtained by Arrhenius equation at different temperatures, the theoretic rate constants were simultaneously calculated with the use of phenomenological model. The results showed that the model correctly predicts the rate constant at the early stage, but underestimates it later. The comparative experiment between OAK and polymeric α-hydroxyalkylphenone photoinitiator (KIP150) shows that the molecular proliferation reaction caused by OAK significantly increases the experimental rate constant in the high-crosslinked stages of the polymerization. The photolatent base would be expected to provide one possible pathway in tackling photo-curing of opaque/thick material.     

含氮含硫姜黄素类似物的微波合成及抗氧化活性研究

利用微波辐射合成含氮含硫的姜黄素类似物,比较了化合物的抗氧化能力。以苯甲醛与环戊酮或环己酮为原料,经克莱森-斯密特缩合反应,采用微波法合成中间化合物2,6-双苯亚甲基环己酮或2,5-双苯亚甲基环戊酮,中间体与尿素或硫脲经Biginelli反应合成目标化合物。利用DPPH法比较各化合物与姜黄素的抗氧化能力。合成了2个未见文献报道的新化合物(2b,2c),结构经IR、1H NMR、13C NMR和MS表征确证;增加含氮、含硫基团的衍生物,其抗氧化能力比姜黄素母核结构高。采用微波法合成含氮含硫的姜黄素类似物可显著提高产率,产率达83%,经24 h含氮、含硫化合物b的抗氧化能力与姜黄素相当,远比姜黄素母核强。