锰（Ⅲ）—四（4—氨基苯基）卟啉与单链脱氧核糖核酸间染色反应的研究

本文研究了固定于硝酸纤维素滤膜（ＮＣ）上单链脱氧核糖核酸（ｓｓＤＮＡ）与锰（Ⅲ）－ｍｅｓｏ－四（４－氨基苯基）卟啉（ＭＮ－ＴＡＰＰ）间的染色反应机理及实用性，室温下，在２５～１００ｍｍｏｌ／Ｌ的磷酸缓冲液（ｐＨ５．５～７．０）中，６０～８０μｇ／ｍＬ锰（Ⅲ）－ｍｅｓｏ－四（４－氨基苯基）卟啉可将固定于ＮＣ膜上的ｓｓＤＮＡ染成绿色，低至１０ｐｇ／ｄｏｔ的ｓｓＤＮＡ亦可被检出。     

meso—四（4—N—取代吡啶基）卟啉铜（Ⅱ）配事物的合成及其对O^—2的清除作用

以Ｃｕ２（ＯＨ）２ＣＯ３为原料通过对非均相金属插入反应合成ｍｅｓｏ－四（４－Ｎ－甲基吡啶基）卟啉合铜和ｍｅｓｏ－四（４－Ｎ－苄基吡啶基）卟啉合铜。方法操作方便产率高。研究表明，在核黄素光照产生Ｏ＾－２的体系中，ＣｕＴＭＰｙＰ和ＣｕＴＢＰｙＰ对Ｏ＾－２具有明显的清除作用，对人红细胞内血红蛋白具有一定保护作用。     

meso-四(4-N-取代吡啶基)卟啉铜(Ⅱ)配合物的合成及其对O-·2的清除作用

以Ｃｕ２（ＯＨ）２ＣＯ３为原料通过非均相金属插入反应合成ｍｅｓｏ－四（４－Ｎ－甲基吡啶基）卟啉合铜（Ⅱ）（ＣｕＴＭＰｙＰ）和ｍｅｓｏ－四（４－Ｎ－苄基吡啶基）卟啉合铜（Ⅱ）（ＣｕＴＢＰｙＰ）．方法操作方便，产率高．研究表明，在核黄素光照产生Ｏ－·２的体系中，ＣｕＴＭＰｙＰ和ＣｕＴＢＰｙＰ对Ｏ－·２具有明显的清除作用，对人红细胞内血红蛋白具有一定保护作用．     

meso—四（4—羟基—3—磺酸苯基）卟啉与Ni（Ⅱ）显色反应…

研究了ｍｅｓｏ－四（４－羟基－３－磺酸苯基）卟啉的显色反应，非离子表面活性剂ＴｒｉｔｏｎＸ－１００，Ｃｄ（Ⅱ）盐和咪唑存在下，溶液ＰＨ９．２５±０．２５时，在沸水浴中加热６ｍｉｎ、Ｎｉ（Ⅱ）与Ｔ（４－ＨＰ）ＰＳ４、ＴｒｉｔｏｎＸ－１００形成多合物。     

新合成的“栅栏式”卟啉及其金属配合物的磁圆二色性研究

研究了３种新合成的“栅栏式”卟啉ｍｅｓｏ－四（ａ，ａ，ａ，ａ－（２－呋喃甲酰氨基）苯基）卟啉（１）、ｍｅｓｏ－四（ａ，ａ，ａ，ａ－Ｏ－（２－噻吩甲酰氨基）苯基）卟啉（２）、ｍｅｓｏ－四（ａ，ａ，，ａ，ａ－Ｏ－（苯并－１５－冠－５－４′－甲酰氨基）苯基）卟啉（３）及其金属配合物：１－ＦｅＣｌ，２－Ｃｕ，３－Ｆｅｃｌ，３－Ｚｎ的磁圆二色谱（ＭＣＤ）利用Ｂｕｃｋｉｎｇｈａｍ－Ｓｔｅｐｈｅｎｓ方程讨论了分     

镍（Ⅱ）与meso—四（4—N—甲基吡啶基）卟啉（TMPyP）络合物的伏…

本文用循环伏安法、溶出伏安法和计时库仑法等多种电化学方法研究了合成的镍（Ⅱ）与ｍｅｓｏ－四（４－Ｎ－甲基吡啶基）卟啉（ＴＭＰｙＰ）络合物的电还原行为。结果表明，Ｎｉ（Ⅱ）ＴＭＰｙＰ的还原过程是中心离子Ｎｉ（Ⅱ）和卟啉环同时还原，其中Ｎｉ（Ⅱ）被还原为Ｎｉ（０），总电子转移数为６。比较并讨论了溶解氧对锰、铁钴、镍卟啉的不同影响。     

meso—四（对—羟基苯基）卟啉与脱氧核糖核酸的作用及其分析应用

报道了非离子型卟啉ｍｅｓｏ－四卟啉与脱氧核糖核酸的作用。在ＰＨ４．９－５．４范围内，ＤＮＡ能与聚合态的ＴＨＰ作用，产生不规则的电子吸收光谱。但如果体系中含有３０％（Ｖ／Ｖ）乙醇，ＤＮＡ与ＴＨＰＰ作用产生４５９．０ｎｍ和７００．０ｎｍ两个新峰。     

两种水溶性镍（Ⅱ）卟啉轴向配位反应热力学参数的光谱法测定

两种水溶性镍（Ⅱ）卟啉轴向配位反应热力学参数的光谱法测定石双群１刘志贤１宋新芳２（河北师范大学化学系１科研处２石家庄０５００１６）据Ｐａｓｔｅｒｎａｃｋ报道［１］，由于水分子在Ｎｉ（Ⅱ）卟啉轴向的配位，ｍｅｓｏ－四（４－Ｎ－甲基吡啶基）卟啉合镍（Ⅱ）...     

C60在卟啉衍生物Langmuir单层膜中的分散状态

研究了Ｃ６０在四苯基卟啉衍生物５，１０，１５，２０－四－对（癸酸α氧基）苯基卟啉（ＴＤＰＰ）及５，１０，１５，２０－四－对（乙酸α氧基）苯基卟啉（ＴＡＰＰ）单层膜中的分散状态。空气／Ｃｄ＾２＋水溶液界面上混合单层膜的π－Ａ等温线、混合膜与花生酸（ＡＡ）形成的交替多层膜的低角Ｘ射线衍射实验及混合单层ＬＢ膜的ＵＶ－Ｖｉｓ光谱表明，在ＴＤＰＰ／Ｃ６０（１：１）的混合单层膜中，Ｃ６０以单分子或（和）聚集体     

金属卟啉－甲基紫精二连体配合物的合成及其光化学行为

本文合成了四（对－氯代甲基）苯基－甲基紫精卟啉及其Ｚｎ，Ｃｏ，Ｍｎ配合物，用元素分析、红外光谱和紫外可见光谱进行了表征。研究了它们的光化学性质。结果表明，在ＴＥＯＡ中光照使Ｍ。ＴＣＭＰＰ－ｍｖ＾２＋发生了分子内从卟啉到甲基紫精的电子迁移反应。在ＺｎＴＣＭＰＰ－ｍｖ＾２＋／ＴＥＯＡ／ＤＭＳＯ－Ｈ２Ｏ体系中可发生光敏化还原ｍｖ＾２＋反应，生成较稳定的ｍｖ＾＋。在Ｍｎ（Ⅲ）ＴＣＭＰＰ－ＭＶ＾２＋／ＣＨ３     

A kinetic fluorometric method for the determination of nucleic acids using a ternary equilibrium system of nucleic acids—iron (III) tetracarboxy phthalocyanine-poly-lysine coupled with the oxidation reaction between hydrogen peroxide and dl-tyrosine

Using the oxidation reaction between hydrogen peroxide and dl-tyrosine as fluorescence indication, the evident tuning effect of nucleic acids on catalytic activity of mimetic enzyme iron (III) tetracarboxy phthalocyanine (FeC₄Pc) in the presence of poly-lysine was observed and studied. The oxidation reaction between hydrogen peroxide and dl-tyrosine with FeC₄Pc as catalyst gave an intensively fluorescent compound, which has an excitation wavelength of 325 nm and an emission wavelength of 418 nm. The fluorescence was quenched by a proper concentration of poly-lysine due to its association with FeC₄Pc and consequently the descent of the catalytic activity of FeC₄Pc, but recovered by addition of nucleic acids. Under optimal conditions, the recovered fluorescence is proportional to the concentration of nucleic acids. Based on the fact, a kinetic fluorescent method was developed for the determination of nucleic acids. The calibration graphs are linear over the range 10-2000 ng/mL both for fish sperm DNA (FS DNA) and calf thymus DNA (CT DNA). The corresponding detection limits are 1.04 ng/mL for FS DNA and 1.18 ng/mL for CT DNA, respectively. Four synthetic and three real nucleic acid samples were determined with satisfactory results.     

阳离子表面活性剂存在下卟啉聚集的光谱研究

报导在阳离子表面活性剂溴化十六烷基三甲铵（CTMAB）存在下mcso-四（对-磺基苯基）卟啉（TPPS_4）发生聚集的电子吸收光谱、荧光光谱和共振光散射光谱特性．结果表明：CTMAB低于1．0×10~(－5)mol·L~(-1)时TPPS_4发生J-型聚集，形成一种交错卡迭式二聚体。在1．0×10~(－5)～1.0×10~(－4)mol·L~(－1)时，J-型聚集产物仍然存在，但TPPS_4的Soret蜂蓝移．如果CTMAB浓度高于1．0×10~（-4）mol·L~（-1），J-型聚集产物消失，出现游离碱卟啉的D_(2h)。吸收特征．相对于水介质，游离碱卟啉的Soret带在CTMAB胶束中红移．     

Highly Sensitive Spectrofluorometric Determination of Nucleic Acid Based on the Aggregation of two Oppositely Charged Kinds of Water-Soluble Porphyrins

Abstract

When cationic 5, 10, 15, 20-tetrakis(4-N-trimethylaminophenyl)porphine (TTMAPP) and anionic 5, 10, 15, 20-tetrakis(4-sulfophenyl)porphine (TSPP) were mixed in aqueous solution, these compounds were rapidly aggregated due mainly to their electrostatic interaction. The fluorescences of both porphyrins were quenched. However, if small amounts of a bulky molecule such as a polymer electrolyte coexisted in this reaction system, the aggregation of TTMAPP and TSPP was inhibited and their fluorescences reappeared. Based on these findings, a new highly sensitive spectrofluorometric determination of nucleic acids (DNA, RNA) was developed. Each calibration curve was linear in the concentration range of 0.03–0.4 μg/ml (DNA) and 0–05–0.6 μg/ml (RNA). Further, the detection limit (S/N = 3) was 0.016 μg/ml for DNA and for RNA, 0.020 μg/ml. The relative standard deviations were DNA: 1.70% and RNA: 1.83% (5 determinations). When the proposed method was applied to the determination of DNA originating from a bacteriophage, the results were satisfactory.     

Novel heterotopic colloids of anionic porphyrins entangled in cationic amphiphilic cyclodextrins: spectroscopic investigation and intracellular delivery

The entanglement process between water-soluble 5,10,15,20-tetrakis(4-sulfonatophenyl)-21H,23H-porphine and the amphiphilic cyclodextrin (CD) heptakis(2-omega-amino-O-oligo(ethylene oxide)-6-hexylthio)-beta-CD and the occurrence of various species at different porphyrin:CD ratios were studied by a combination of UV/Vis absorption, fluorescence anisotropy, time-resolved fluorescence, resonance light scattering, and circular dichroism. The effect of the entanglement process on the mean vesicle diameter was investigated over a wide concentration range by quasielastic light-scattering techniques. The experimental results indicate that the presence of porphyrins in this colloidal system promotes some structural rearrangements, essentially driven by charge interaction, which are responsible for a sensitive change of vesicle dimensions. In the range of porphyrin:CD molar ratios between 1:10 and 1:50, the porphyrin is solubilized in monomeric form (tau(1)=11.5 ns) and photosensitizes the production of singlet oxygen ((1)O(2)). At the same molar ratio the ability of this amphiphilic cyclodextrin to transport porphyrins into tumor cells indicates specificity at the nuclear-compartment level. These findings may be of potential interest for the of development agents for photodynamic therapy of tumors.     

Long-range assemblies on poly(dG-dC)2 and poly(dA-dT)2: phosphonium cationic porphyrins and the importance of the charge

The present paper describes synthesis and spectroscopic properties of novel cationic meso-tetraphenylporphyrins bearing two (trans) (P2) or three (P3) triphenylphosphonium substituents. The porphyrin aggregation in aqueous solutions is discussed in detail. Porphyrin binding to and self-organization onto long-range assemblies on poly(dA-dT)2 or poly(dG-dC)2 were probed by combination of absorption, fluorescence, circular dichroism (CD), transient and resonance light-scattering (RLS) techniques. The higher hydrophobicity of P2 is manifested by more extensive self-organization. Induced CD and intensive RLS indicate binding to the chiral environment on the nucleic acids exterior and exciton coupling between adjacent porphyrin moieties. The CD spectra of P2 on poly(dG-dC), and poly(dA-dT)2 suggest that the binding geometry is essentially independent of the base sequence. The fluorescence lifetime of about 4 ns was attributed to the long-range assembly. In the case of P3 the distinctly different CD spectra induced by GC or AT base-pair regions reveal that the number of the substituents determines how closely the porphyrin can approach the specific electronic environment on the nucleic acid exterior. The fluorescence lifetime of the P3 assembly is about 2 ns.     

Near-infrared fluorimetric determination of nucleic acids by shifting the ion-association equilibrium between tetracarboxy aluminum phthalocyanine and tetra-N-hexadecylpyridiniumyl porphyrin

A new method was developed for determination of micro amounts of nucleic acids based on near-infrared (near-IR) fluorescence recovery, employing a two-reagent system which is composed of an anionic tetracarboxy aluminum phthalocyanine (AlC₄Pc) and a cationic tetra-N-hexadecylpyridiniumyl porphyrin (TC₁₆PyP). The fluorescence of the AlC₄Pc, with the maximum emission wavelength at 701 nm, could be quenched by TC₁₆PyP at its proper concentration, but recovered by adding nucleic acids. Under optimal conditions, the recovered fluorescence is proportional to the concentration of nucleic acids. The calibration graphs are linear over the range of 1-200 ng mL⁻¹ for fish sperm DNA (FS DNA) and 2-400 ng mL⁻¹ for calf thymus DNA (CT DNA). The corresponding detection limits are 0.59 ng mL⁻¹ for FS DNA and 0.82 ng mL⁻¹ for CT DNA, respectively. Four synthetic and three real nucleic acid samples were determined with satisfactory results.     

Determination of nucleic acids with crystal violet by a resonance light-scattering technique

For the first time, Crystal Violet (CV) was used to determine nucleic acid concentrations using the resonance light-scattering (RLS) technique. Based on the enhancement of the RLS of CV by nucleic acids, a new quantitative determination method for nucleic acids in aqueous solutions has been developed. At pH 5.03 and ionic strength 0.005 mol kg-1, the interaction of CV with nucleic acids results in three characteristic RLS peaks at 344.0, 483.0 and 666.0 nm. With 4.0 x 10(-5) mol l-1 of CV, linear relationships were found between the enhanced intensity of RLS at 666.0 nm and the concentration of nucleic acids in the range 0-2.5 micrograms ml-1 for herring sperm DNA, 0-4.0 micrograms ml-1 for calf thymus DNA and 0-4.5 micrograms ml-1 for yeast RNA. The limits of determination were 13.8 ng ml-1 for herring sperm DNA, 36.8 ng ml-1 for calf thymus DNA and 69.0 ng ml-1 for yeast RNA. The assay is convenient, rapid, inexpensive and simple.     

Computational studies of peripheral ring twisting in meso-N-methyl pyridyl-substituted porphyrins

Semiempirical molecular orbital calculations for the porphyrins tetrakis(4-N-methyl pyridyl)porphine (H₂TMpyP-4) and tetrakis(2-N-methyl pyridyl)porphine using the MNDO and AM -1 Hamiltonians suggest that twisting one or more of the pyridinium rings results, at considerable energy expense, in highly nonplanar macrocycle configurations as the exocyclic ring(s) approach coplanarity. The results imply that the mechanism of intercalation of H₂TMpyP-4 into DNA cannot require twisting the exocyclic rings anywhere close to coplanarity with the central porphine core, but involves, instead, the inherent flexibility of DNA itself. © 1993 John Wiley & Sons, Inc.     

Spectrophotometric Studies on the Proton Transfer from the Protonated DNA to 5,10,15,20-Tetrakis[4-(trimethyammonio)-phenyl]porphine

Abstract

The interaction of nucleic acids with 5, 10, 15, 20-tetrakis[4-trimethy-ammonio)phenyl]porpine (TAPP) were investigated on the basis of a mechanistic discussion, and a spectrophotometric method for DNAs was accordingly proposed in the present paper. Depending on the acidity of the solution, TAPP can interact with nucleic acids, producing different absorption features. When the pH of the solution is higher than 6.39, TAPP can interact with both DNAs and RNA, giving a new absorption band at 420.3 nm. If the pH is lower than 6.39, however, the interactions with DNAs (but not RNA) can give an absorption band centered at 436.3 nm. It was found that the absorption band at 436.3 nm originates from the proton transfer from the protonated double-stranded structure of DNA to TAPP. At optimal conditions, the absorbance at 436.3 nm is in proportion to the concentration of the DNAs. Calibration curves were linear in the range of 0±3.0 μg.ml^?1 for calf thymus and 0±3.2 μg.ml^?1 for fish sperm DNA. No interference of 4-fold of RNA was found for the determination of DNAs. The limits of determination (3[sgrave]) were 34.6 ng.ml^?1 for calf thymus DNA and 33.2 ng.ml^?1 for fish sperm DNA, respectively. Four synthetic samples were determined with satisfaction.     

侧链键合锰卟啉的线型聚甲基丙烯酸缩水甘油酯的制备及其谱学性质

采用Adler法合成了Meso-四(对羟基苯基)卟啉(THPP), 在均相体系中使聚甲基丙烯酸缩水甘油酯(PGMA)与THPP发生开环反应, 得到侧链键合有羟基苯基卟啉的线型PGMA(HPP-PGMA); 进一步使HPP-PGMA与锰离子发生配合作用, 得到侧链键合有锰卟啉(MnP)的线型PGMA(MnP-PGMA), 测定了HPP-PGMA的1H NMR谱, 表征了其化学结构; 测定了HPP-PGMA与MnP-PGMA的UV-Vis光谱及荧光发射光谱, 考察了其光物理行为. 实验结果表明, 通过THPP外环上羟基与PGMA侧基环氧键的开环成醚反应, 可以顺利地将羟基苯基卟啉及其锰配合物键合在PGMA的侧链上. HPP-PGMA具有THPP的特征电子吸收光谱与荧光发射光谱, 且随着THPP键合度的增加, 光谱的强度增强. MnP-PGMA具有小分子锰卟啉的特征电子吸收光谱与荧光特征, 其Soret吸收带发生显著红移(红移58 nm), Q吸收带的数量减为3个吸收峰; 实验发现, MnP-PGMA与小分子锰卟啉类似, 在Q发射带没有荧光发射.