壳聚糖对药液絮凝作用的研究

以壳聚糖为絮凝剂，研究了它对丹参水提液的絮凝情况。比较了絮凝剂加入量不同和分子量不同时，絮凝物的沉降速率，从而考察了它们对絮凝效果的影响以及所得产品的质量。     

交联聚丙烯酰胺负载的氧化β—环糊精的合成及其对尿素的吸…

以交联烯酰胺为载体，合成了高分子负载的氧化β－环糊精，并研究了它在不同条件下对尿素分子的吸附性能。     

醌—硫硫聚合物的合成及电化学性能的研究

聚有机二硫化物的电化学性质，受到与它共聚的有机基团的影响。为此，我们以对苯二甲醚为原料经氯甲基化，硝酸氧化，与二硫化钠缩合制得了醌－硫硫共聚物，并用循环伏安法研究了该种共聚物的电化学性质，讨论了有机基团对Ｓ－Ｓ－键电化学性质的影响，并组装成电池研究它的放电行为。     

以交联聚乙烯醇为载体的阴离子交换剂的合成与性能研究

大孔乙酸乙烯酯－异氰尿酸三烯丙酯共聚物树脂经醇解生成亲水性的交联聚乙烯醇，然后相继与环氧氯丙烷和二乙胺反应，合成出含二乙基氨基羟丙基的阴离子交换剂，研究了交联聚乙烯醇环氧基化的最佳条件，发现以二甲基亚砜作溶剂能够显著地提高活化程度，反应时间以３ｈ为最佳，并研究了该阴离子交换剂的交换量、亲水性、热稳定性、溶胀稳定性，发现它具备常压分离蛋白质所需的基本性能，是较为理想的生化用的离子交换剂。     

NICA-Donnan模型对重金属吸附的应用进展

Koopal等荷兰、英国和法国的学者在对腐殖酸吸附重金属研究提出了NICA-Donnan模型，它提出质子结合和金属离子结合的相关性，以扩展Henderson-Hasselbalch模型或Hill模型作为局部吸附等温模型，采用连续亲和分布解释了吸附剂异相性，并引入Donnan模型来解释非特异吸附和静电吸附。NICA-Donnan模型具有很大灵活性和适应性，在环境科学领域得到广泛应用。     

可配位液晶分子的合成及表征

以焦性没食子酸和异烟酸为原料合成了带吡啶官能团的液晶配体。将液晶和配体相结合，成功合成了具有配位能力的液晶分子，采用红外光谱（FT-IR）对其结构进行了表征，通过示差扫描量热法（DSC），热失重（TGA）和偏光显微镜（POM）等方法研究了它的液晶性和相变温度。结果表明，合成产物液晶性良好。     

二甘醇二苯醚作为气相色谱固定液的研究

以二甘醇二苯醚作为气相色谱的固定液，对其色谱性能、分离效率作了初步研究，它对醇类、酯类、含氮类、芳香类化合物、氯代烃及高沸点有机混合物，其分离度大于1．5，分离效率达99．7％，分离效果好，显示了较高的柱效能和广谱特性。     

生物质组分及温度对闪速热解挥发分的影响

生物质是一种可再生、污染小的自然资源，它可以直接燃烧产生热能，也可以转化为气体、液体燃料或化工原料。生物质热转化技术近年来受到国内外学者的广泛重视。而热转化过程中，热解是第一步，与生物质组分、热解温度、滞留时间等因素有关。热重仪（TGA）是一种研究热解机理常用的方法，它适用于慢速程序升温的热解研究。研究发现，热解条件及生物质种类对反应表观活化能与表观频率因子等动力学参数有很大影响。层流炉闪速加热设备，已经用于煤的热解研究。本文利用自己设计的以热等离子体为热源的层流炉系统，对椰子壳、棉花秆和稻壳粉末进行了闪速热解实验研究及模型理论分析，探讨了生物质化学组分、热解温度和滞留时间对挥发分的影响，为生物质闪速热解提供了一定的基础数据。     

过渡金属络合催化活性顺序的量子化学研究（Ⅲ）─对氧分子的活化

本文用我们自已建立的以ＨＭＯ为主的量子化学方法研究了过渡金属对氧分子的活化问题。研究结果表明，它不仅可以讨论过渡金属对氧分子的催化活性顺序以及络合方式和配位体对催化活性的影响，而且可以讨论过渡金属的催化活性随底物分子迁移的规律以及可逆载氧体的结构和性能之间的关系。     

过渡金属络合催化活性顺序的量子化学研究（Ⅲ）：对氧分子的活化

本文用我们自己建立的以ＨＭＯ为主的量子化学方法研究了过渡金属对氧分子的活化问题。研究结果表明，它不仅可以讨论过渡金属对氧分子的催化活性顺序以及络合方式和配位体对催化活性的影响，而且可以讨论过渡金属的催化活性随底分子迁移的规律以及可逆载氧体的结构和性能之间的关系。     

丁香酸-铜配合物的合成、表征及与DNA的相互作用的研究

自发现铂类配合物具有一定抗癌效果以来,小分子与金属离子配位的研究成为发现抗癌药物的重要途径。本文首先通过紫外光谱分析、红外光谱分析、质谱分析等方法证实丁香酸与铜离子形成配合物,且初步推断出配合物的组成为(C_9H_8O_5)Cu·H_2O;其次通过紫外光谱分析、荧光光谱分析、粘度测定等方法对丁香酸-铜配合物与DNA作用模式进行研究,证明了丁香酸-铜配合物与DNA作用模式为插入模式。     

First ruthenium organometallic complex of antibacterial agent ofloxacin. Crystal structure and interactions with DNA

An organometallic ruthenium complex of quinolone antibacterial agent ofloxacin, [(η(6)-p-cymene)RuCl(O,O-oflo)]·2.8H(2)O (1·2.8H(2)O), was isolated, and its crystal structure was determined. In this "piano-stool" complex, quinolone is bidentately coordinated to the metal through the ring carbonyl and one of the carboxylic oxygen atoms. Interactions of the title complex with DNA were studied by spectroscopic methods [electronic, fluorescence, and circular dichroism (CD)] and atomic force microscopy (AFM). It was established that the electrostatic attraction between the ruthenium complex and DNA in a solution is important for binding because interactions were observed only in a solution with low ionic strengths. An induced-CD (ICD) signal was observed in a solution of DNA and the title complex, which proves interaction between ruthenium and macromolecules. Competitive binding between cisplatin and 1 to DNA revealed that cisplatin prevents binding of 1. Our experiments revealed that binding of the title complex to DNA occurs also if guanine N7 is protonated. AFM has shown that the title complex provokes DNA shrinkage. Preliminary biological tests have also been performed.     

Design,synthesis and characterization of tin‐based cancer chemotherapy drug entity: In vitro DNA binding,cleavage, induction of cancer cell apoptosis by triggering DNA damage‐mediated p53 phosphorylation and molecular docking

A new organotin complex derived from propyl gallate and 1,10‐phenanthroline was designed, synthesized and characterized using spectroscopic and elemental analytical methods. The underlying mechanisms of the anticancer action of the tin complex were further elucidated by evaluating its in vitro DNA interaction and the regulating signaling pathways. Our results showed that the tin complex could effectively activate DNA strand breaks in MCF‐7 cells in a dose‐dependent manner after cellular internalization. Phosphorylation of a DNA damage marker, histone H2A.X (Ser139), was thus upregulated in treated cells. Additionally, our results indicate that p53 is phosphorylated in response to DNA damage, and that this phosphorylation may be involved in the subsequent induction and activation of p53. In vitro DNA binding of the complex in Tris–HCl buffer was studied using various biophysical methods, revealing that the tin complex binds to DNA non‐covalently via electrostatic interaction. The higher K_b value of the complex suggested greater DNA binding propensity. Further, to evaluate the mode of action at the molecular level, interaction studies of the tin complex with nucleotide (5′‐GMP) were carried out. The complex exhibits DNA cleavage activity with supercoiled pBR322 in the presence of different activators. The complex cleaves DNA efficiently via oxidative cleavage pathway. Molecular docking studies were performed to understand the binding mode of the tin complex with DNA (PDB ID: 1BNA).     

钌(Ⅱ)多吡啶配合物与DNA相互作用的等温滴定量热研究(英)

The interaction of ruthenium(Ⅱ) polypyridyl complex with DNA has been studied by isothermal titration calorimetry (ITC). The results show that complex [Ru(phen)₂PMIP]²⁺ {phen=1,10-phenanthroline, PMIP=2-(4-methylphenyl)imidazo[4,5-f]1,10-phenanthroline} interacts with calf thymus DNA (CT DNA) in terms of a model for a single set of identical sites through intercalation. The results are in agreement with our previous observations from spectroscopic methods and viscosity measurements. In addition, the results further show that the driving force for DNA binding with the complex is mainly driven by the enthalpy changes, and the contribution from the entropy changes to this driving force is negligible.     

Supramolecular complex formation by beta-cyclodextrin and ferrocenylnaphthalene diimide-intercalated double stranded DNA and improved electrochemical gene detection

Ferrocenylnaphthalene diimide 1 can bind to double stranded DNA (dsDNA) by the threading intercalation mode and the resulting complex was stabilized further by beta- cyclodextrin (CD) by forming a supramolecular complex. These complex formation processes were studied by spectroscopic, viscometric, and electrochemical means in the absence or presence of beta-CD. Quantitative analysis by quartz crystal microbalance (QCM) and electrochemical experiments strongly suggested a 2:1 binding stoichiometry for beta-CD to 1 threading-intercalated to the dsDNA-immobilized electrode. Owing to this supramolecular complex formation, electrochemical DNA detection based on 1 was improved considerably.     

2,2'-联吡啶In(Ⅲ)配合物与DNA作用的电化学研究

应用循环伏安法、微分脉冲伏安法和交流阻抗法研究了配合物In(bpy)Cl3.H2O与DNA在Tris-HCl缓冲溶液(pH=7.2)中的相互作用.结果表明:配合物中心In(Ⅲ)离子的循环伏安曲线上呈现一对准可逆的氧化还原波,DNA与配合物作用后,配位中心离子的氧化还原峰电流明显降低,扩散系数减小,电化学反应阻抗增大,式量电位负移,表明该配合物与DNA的作用方式为静电结合.     

Comparison of magnetic properties of DNA-cetyltrimethyl ammonium complex with those of natural DNA

We prepared the DNA-cetyltrimethyl ammonium complex, as well as the same complex intercalated with stable organic free radicals, and studied their magnetic properties by electron magnetic resonance (EMR) spectroscopy and by measuring the magnetization on a superconducting quantum interference device (SQUID). The UV-vis and CD spectra of DNA-quaternary alkyl ammonium complex (DNA--Q+) in organic solvent clearly demonstrated that it retained the double helical B-form conformation. The interhelical spacing of double strand DNA (dsDNA) increased when the counter ions (Na+) of phosphate groups of the natural DNA were replaced with the long alkyl quaternary ammonium groups. The inter-helical distance of DNA-cetyltrimethyl ammonium (CTMA) was 39.1  as confirmed by X-ray diffractometry. In general, the magnetization of the DNA-CTMA complex solid was found to be significantly lower than that of natural DNA. Moreover, intercalation of the complex with stable organic free radicals did not improve magnetization, which again was in marked contrast to natural DNA. EMR spectroscopic behavior of the complex in the solid state also was quite different from that of natural DNA: The unique broad EMR signal of natural DNA in the low field region with g-value greater than 10 disappeared in the DNA-CTMA complex.     

Fluorimetric estimation of DNA content using sensitized lanthanide fluorescence

Lanthanide fluorescence enhancement on complexation with calf thymus DNA was studied in aqueous solution. The DNA sensitized and enhanced fluorescence of terbium and europium by nearly two orders of magnitude. By applying this ligand sensitized lanthanide fluorescence enhancement, DNA could be estimated at 10 ppb level. Further, effect of addition of TOPO in Triton X-100 micellar medium to Tb-DNA complex in solution was also studied. On addition of TOPO, no synergistic terbium fluorescence enhancement was observed.     

Interaction of Cu-dipeptide complexes with Calf Thymus DNA and antiproliferative activity of [Cu(ala-phe)] in osteosarcoma-derived cells

In this work the study of Calf Thymus DNA interaction with several Cu(l-dipeptide) complexes was reported. The binding stoichiometry (Cu(mmol)/DNAmol base) was determined and in an attempt to clarify the binding mode, EPR and CD experiments were performed. All the studied complexes interacted with DNA, in a more selective way than [Cu(H₂O)₆]²⁺, being the [Cu(ala-phe)] the complex with the highest interaction. The EPR experiments suggested that the monomeric species formed in solution were coordinated through a nitrogen atom of the DNA bases (inner-sphere binding) and the CD studies showed structural changes upon the DNA–complex interaction. Besides, the ratio Cu(mmol)/DNAmol base obtained by the binding stoichiometry experiments was close to that found by EPR and CD determinations. The effect on cell proliferation determined by the crystal violet bioassay on UMR106 rat osteosarcoma-derived cells showed that the [Cu(ala-phe)] complex exerted an antiproliferative action against this tumor line.     

Complexation of DNA with cationic surfactants as studied by small-angle X-ray scattering

The phase behaviors of the complex formed by didodecyldimethylammonium bromide(DDAB)and cetyltrimethylammonium bromide(CTAB)interacting with three different types of DNAs,salmon testes DNA(~2000 bp),21-bp double-stranded oligonucleotides(oligo-ds DNA),and 21-nt single-stranded oligonucleotides(oligo-ss DNA)were studied by synchrotron small-angle X-ray scattering.It was found that the DNA length and flexibility,together with the positive/negative charge ratio,determined the final structure.At higher charge ratios,the DNA length exhibited negligible effect.Both oligo-ds DNA and salmon DNA formed inverted hexagonal packing of cylinders with CTAB,as well as bilayered lamella with DDAB.However,at lower charge ratios,oligo-ds DNA formed a distorted hexagonal phase with CTAB and a new structure with DDAB,which was different from the behaviors of salmon DNA.The flexible oligo-ss DNA formed rich structures that were subject to environmental disturbance.Kinetic study also indicated that the structures of the complex formed by oligo-ss DNA took much longer to mature than the structures formed by oligo-ds DNA.We attributed this result to the conformational adjustment of oligo-ss DNA in the complex.