TCM active ingredient oxoglaucine metal complexes: crystal structure, cytotoxicity, and interaction with DNA

The alkaloid oxoglaucine (OG), which is a bioactive component from traditional Chinese medicine (TCM), was synthesized by a two-step reaction and used as the ligand to react with transition metal salts to give four complexes: [OGH][AuCl(4)]·DMSO (1), [Zn(OG)(2)(H(2)O)(2)](NO(3))(2) (2), [Co(OG)(2)(H(2)O)(2)](ClO(4))(2) (3), and [Mn(OG)(2)(H(2)O)(2)](ClO(4))(2) (4). The crystal structures of the metal complexes were confirmed by single crystal X-ray diffraction. Complex 1 is an ionic compound consisting of a charged ligand [OGH](+) and a gold complex [AuCl(4)](-). Complexes 2-4 all have similar structures (inner-spheres), that is, octahedral geometry with two OG coordinating to one metal center and two aqua ligands occupying the two apical positions of the octahedron, and two NO(3)(-) or ClO(4)(-) as counteranions in the outer-sphere. The complexation of OG to metal ion was confirmed by ESI-MS, capillary electrophoresis and fluorescence polarization. The in vitro cytotoxicity of these complexes toward a various tumor cell lines was assayed by the MTT method. The results showed that most of these metal-oxoglaucine complexes exhibited enhanced cytotoxicity compared with oxoglaucine and the corresponding metal salts, with IC(50) values ranging from 1.4 to 32.7 μM for sensitive cancer cells, which clearly implied a positive synergistic effect. Moreover, these complexes appeared to be selectively active against certain cell lines. The interactions of oxoglaucine and its metal complexes with DNA and topoisomerase I were investigated by UV-vis, fluorescence, CD spectroscopy, viscosity, and agarose gel electrophoresis, and the results indicated that these OG-metal complexes interact with DNA mainly via intercalation. Complexes 2-4 are metallointercalators, but complex 1 is not. These metal complexes could effectively inhibit topoisomerase I even at low concentration. Cell cycle analysis revealed that 1-3 caused S-phase cell arrest.     

SnO2-TiO2复合颗粒的形态结构及其光催化活性

在气溶胶反应器中,利用TiCl4高温氧化反应制备超细TiO2,采用均匀沉淀法在TiO2表面沉积SnO2,制备SnO2-TiO2复合颗粒,应用TEM、EDS、XRD、BET比表面积测试等手段对粒子进行表征。以活性艳红X-3B溶液为处理对象,考察复合颗粒的光催化活性。结果表明SnO2-TiO2复合颗粒的光催化活性较纯气相合成超细TiO2有较大提高,SnO2最佳含量为15.3%,SnO2-TiO2复合颗粒光催化活性的提高归因于不同能级半导体之间光生载流子的输运和分离。     

NH-S hydrogen bonding in zinc enzyme model complex with S2N2 binding set studied by normal coordinate analysis of vibrational spectra

In order to provide theoretical evidence for the existence and effect of NH-S hydrogen bonding in the zinc enzyme model complex [Zn(S-2-C6H4NHCOC6H5)2(1-MeIm)2] (1-MeIm = 1-methylimidazole) in addition to the spectroscopic and crystallographic investigations, normal coordinate analysis (NCA) was carried out using a modified Urey-Bradley force field. The vibrational frequencies of the complex with and without the NH-S hydrogen bonding as well as the corresponding internal coordinates were obtained. The good agreement found between the calculated and observed frequencies in the presence of the NH-S hydrogen bond, supports the reliability of the analysis. The stretching force constant of the NH-S hydrogen bond obtained from the calculation is 0.18 mdyne per A. The calculation shows that the N-H bond is weakened by formation of the NH-S hydrogen bond. The results are indicative of the existence of the NH-S hydrogen bond in the complex.     

SO_4~(2-)/SnO_2固体超强酸结构表征

合成了 SO2 - 4/ Sn O2 固体超强酸催化剂。采用 FT-IR、TG-DSC和 XRD技术研究了 SO2 - 4/ Sn O2 的结构 ,其测试结果表明 :SO2 - 4/ Sn O2 的结构与其催化活性存在很好的一致性。     

用C60键合硅胶固定相液相色谱分离杯芳烃及杯芳冠醚类化合物

以自合成的C60 键合硅胶液相色谱固定相 ,分别选用3种不同选择性的流动相体系 :异丙醇 -环己烷 ,氯仿 -环己烷和二氯甲烷 -环己烷 ,考察了流动相组成对杯芳烃及杯芳冠醚化合物保留行为和分离选择性的影响。在一定的流动相条件下溶质能得到较好分离。     

甲烷部分氧化制合成气的钙钛矿型致密透氧膜反应器的数值模拟(英文)

采用等温理论模型,以甲烷催化氧化制合成气为模型反应,模拟非担载钙钛矿型致密透氧膜反应器的性能。分别研究了Ｌａ_０．２Ｂａ_０．８Ｆｅ_０．８Ｃｏ_０．２Ｏ_(３－δ)、Ｌ３０．２Ｓｒ０．８Ｆｅ０．８Ｃｏ０．２Ｏ３－δ和ＳｒＦｅＣｏ０．５Ｏｘ三种透氧速率不同的膜材料、膜反应器的尺寸以及反应工艺条件对ＣＨ４转化率、ＣＯ选择性和Ｈ２／ＣＯ摩尔比的影响,对膜反应实验具有指导意义。     

铜Ⅱ与α,β-不饱和酸根和安替比林三元配合物的合成、表征、晶体结构和磁性

合成了铜 与丙烯酸根和安替比林及铜 与α 甲基丙烯酸根和安替比林两种三元配合物 ,进行了元素分析、红外光谱、电子反射光谱、ESR谱和变温磁化率等研究 ,确定配合物的组成为Cu2 A4 (C11H12 N2 O) 2 ,其中A =CH2 =CH COO- 、CH2 =C(CH3) COO- ,C11H12 N2 O =安替比林。测定了Cu2 [CH2 =C(CH3) COO]4 (C11H12 N2 O) 2 的晶体结构。晶体属单斜晶系 ;P2 1/n群 ;晶胞参数 :a =1.2 0 2 6 4 (8)nm ,b =0 .876 0 4 (10 )nm ,c=1.882 4 6 (14)nm ,β =10 0 .80 2 (5)° ;Z =2 ;最终偏离因子R =0 .0 30 4。Cu 具有畸变的四角锥形配位环境 ,两个Cu 由四个α 甲基丙烯酸根桥联 ,在Cu 的端位各有一个安替比林分子以O原子配位。Cu Cu 间具有一对称中心 ,Cu Cu 间距离为 0 .2 6 6 15(3)nm。变温磁化率研究表明两种配合物中Cu Cu 间具有强烈的反铁磁性偶合作用     

Analysis of aesculin and aesculotin in Cortex fraxini by capillary zone electrophoresis

A simple method for quantitative analysis of aesculin and aesculetin in Cortex fraxini was developed using capillary zone electrophoresis (CZE). Berberin was employed as an internal standard, The running buffer was 6 mM Na(2)B(4)O(7) and 10 mM NaH(2)PO(4) (pH 6.70). The linear calibration range was 32-256 mug ml(-1) (r=0.9996) for aesculin and 23-230 mug ml(-1) (r=0.9993) for aesculetin. The contents of aeculin and aesculetin in C. fraxini were easily determined within 12 min the pKa values of aesculin and asculetin determined by CZE were 6.56 and 5.62, respectively. A simple method for estimation of the temperature inside the capillary during running was also proposed.