8—羟基喹啉—5—磺酸金属合物的荧光特性及其应用研究

本文报道了８－羟基喹啉－５－磺酸的金属络合物在不同条件下的荧光特性，探讨了使用激光－时间分辨技术，建立镁、铝荧光分析方法的可能性     

稀土元素悬浮液荧光体系的研究—铕—钆—二苯甲酰甲烷—二乙胺体系

系统研究了明胶对铕－钆－二苯甲酰甲烷－二乙胺沉淀悬浮液荧光体系的稳定化作用和钆对铕的荧光增强效应，使荧光强度提高约２个数量级，Ｅｕ的检出限达８．５×１０＾－１３ｍｏｌ／Ｌ（ｋ＝３），该体系可用于Ｇｄ２Ｏ３中痕量Ｅｕ的测定，结果满意。     

3—对甲苯基—5—（4‘—硝基—2’—羧基苯偶氮）—2—硫代—4—噻唑啉酮的合成…

本报道了新荧光试剂３－对甲苯基－５－（４’－硝基－２’－羧基苯偶氮）－２－硫代－４－噻唑啉酮（ＭＰＮＣＰＡＴＴＮ）的合成，通过元素分析、红外光谱，核磁共振氢谱和质谱确证了其结构。在ＰＨ５．６时，它与铜（Ⅱ）形成稳定的荧光络合物，在λｅｘ／λｅｍ＝３０８ｎｍ／４０３ｎｍ处产生强烈荧光，其荧光强度与铜（Ⅱ）的浓度在６．２８×１０＾－９－９．４４×１０＾－７ｍｏｌ／Ｌ范围内呈线性关系，检测限为０．３９     

含7—氨基—4—甲基香豆素的蛋白酶荧光底物

本文设计并合成了一系列含７－氨基－４－甲基香豆素的肽类荧光底物，通过动力学测定研究了氨基酸结构对底物专一性的影响，发现Ｓｕｃ－Ａｌａ－Ａｌａ－Ｐｈｅ－ＡＭＣ和Ｓｕｃ－Ａｌａ－Ｐｒｏ－Ｐｈｅ－ＡＭＣ是较好的胰凝乳蛋白酶荧光底物。     

罗丹明B—7—碘—8—羟基喹啉—5—磺酸胶束体系荧光熄灭法测定铌

研究了铌－罗丹明Ｂ－７－碘－８－羟基喹啉－５－磺酸－表面活性剂四元体系的荧光特性，提出了以罗丹明Ｂ－７－磺－８－羟基喹啉－５－磺酸－溴化十六烷基三甲铵荧光熄灭法的方法。本方法灵敏度高，选择性好，采用适当的掩蔽剂，测定了铁矿和合金中的微量铌，获得满意的结果。     

荧光试剂3—苯基—5—苯甲酰基—2—硫代—4—噻唑啉酮的合成及应用

本文报道了荧光试剂３－苯基－５－苯甲酰基－２－硫代－４－噻唑啉酮（ＰＢＴＴ）的合成。产品经柱层析提纯，用元素分析、ＩＲ、＾１ＨＮＭＲ和ＭＳ确证了其结构；研究了它的荧光性质。在ＰＨ５．６时，与痕量铥（Ⅲ）形成络合物，且在λｅｘ／λｅｍ＝３０５ｎｍ／４０５ｎｍ产生强荧光，测定了人工合成样品的铥，结果比较满意。     

用新试剂2[—5‘—氟—2’—砷酸基苯）偶氮]—1,8—二羟基—3,6—萘二磺酸荧光法

研究了试剂２－」５’－氟－２’－－砷酸基苯）偶氮「－１，８－二羟基－３，６－萘二磺酸与硼的荧光性能。硼与试剂形成１：２的强荧光配合物，其λｅｘ／λｅｍ＝２３４ｎｍ／３８０ｎｍ，Ｂ（Ⅲ）含量在０－３６０μｇ／Ｌ范围内呈良好线性关系，检测限为２．０６μｇ／Ｌ，据此建立了测定微量硼的新方法。     

苯基荧光酮—TritonX—100荧光熄灭法测定微量钼研究

本文用荧光熄灭法研究了苯基荧光酮－ＴｒｉｔｏｎＸ－１００－Ｍｏ（Ⅵ）体系的测定方法及条件。在ｐＨ１．０－３．０的盐酸介质中，Ｍｏ（Ⅵ）检测限为０．２μｇ／２５ｍＬ范围内具有线性关系。本法灵敏度高，选择性好，用于检测球墨铸铁中的微量钼，结果满意。     

新荧光试剂3—对甲苯基—5—（2‘—羧基苯偶氮）绕丹宁的合成及荧光光度…

本文报道了新荧光试剂３－对甲苯基－５－（２＇－羧基苯偶氮）绕丹宁的合成。用元素分析、红外光谱、核磁共振氢谱和质谱确证了其结构，研究了其荧光性质。在ＰＨ５．６时，该试剂与Ｃｕ＾２＋形成稳定的荧光螯合物，且在λｅｘ／λｅｍ＝３０５ｎｍ／４０５ｎｍ产生强烈荧光。     

苯基荧光酮—CTMAB荧光熄灭法测定微量钛

基于Ｔｉ（Ⅳ）对ＣＴＭＡＢ－苯基荧光酮体系的荧光熄灭效应，建立了测定微量Ｔｉ（Ⅳ）的荧光分析新方法，在ＰＨ２．８－３．５的邻苯二甲酸氯钾－盐酸缓冲介质中，测量Ｔｉ（Ⅳ）的线范围为０．２－１．２μｇ／２５ｍｌ。方法灵敏度高，选择性好，可用于检测铝合金中微量钛，结果满意。     

同步荧光分析法的应用及其新进展

同步荧光技术是解决多组分荧光物质同时测定的良好手段之一.本文从恒波长同步荧光法、恒能量同步荧光法、可变角同步荧光法、恒基体同步荧光法以及它们与导数技术、低温技术、化学计量学方法的联用等方面对同步荧光技术领域出现的新技术及应用作一评述.     

Water-soluble fluorescent boronic acid compounds for saccharide sensing: substituent effects on their fluorescence properties

Four new naphthalene-based boronic acid compounds (1-4) were synthesized. The effect of various carbohydrates on their fluorescence properties has been studied in aqueous phosphate buffer at pH 7.4. Different substitutions on the aniline group of the naphthalene ring resulted in significant differences in fluorescence properties for these four compounds. Compound 1 shows ratiometric fluorescence changes upon addition of a sugar. Compounds 2 and 3 do not show ratiometric fluorescence changes but show very large fluorescence intensity changes (about 70-fold fluorescence intensity increase). In addition to the quantifiable fluorescence property changes upon sugar addition, the fluorescence color changes of 1-3 are also visible to the naked eye. However, amidation of the aniline nitrogen atom significantly diminishes the fluorescence intensity of compound 4. The crystal structure of one boronic acid provided some insight into the structural features that are important for the fluorescence properties of these compounds.     

Spectrum Correction in Study of Solvation Dynamics by Fluorescence Non-collinear Optical Parametric Ampli cation Spectroscopy

Femtosecond time-resolved fluorescence non-collinear optical parametric amplification spectroscopy can extract the curve of spectral gain from its parametric superfluorescence. This unique spectrum correction method enables fluorescence non-collinear optical parametric amplification spectroscopy acquiring the genuine transient fluorescence spectrum of the studied system. In this work we employ fluorescence non-collinear optical parametric amplification spectroscopy technique to study the solvation dynamics of DCM dye in ethanol solution, and confirm that genuine solvation correlation function and shift of peak frequency can be derived from transient fluorescence spectra after the spectral gain correction. It demonstrates that fluorescence non-collinear optical parametric amplification spectroscopy can benefit the research fields, which focuses on both fluorescence intensity dynamics and fluorescence spectral shape evolution.     

空间分辨荧光分析技术

空间分辨荧光分析技术突破了传统荧光分析的局限,为获得空间定位信息提供了技术保障。系统地综述了构成该技术的共焦荧光法、全内反射荧光法、多光子荧光法以及近场荧光法等4种方法的原理、特点、发展及其应用,并且强调了其在单分子测定中的作用。引用文献64篇。     

Microanatomical and biochemical origins of normal and precancerous cervical autofluorescence using laser-scanning fluorescence confocal microscopy

Clinical studies have shown that in vivo fluorescence spectroscopy can improve the diagnosis of cervical precancer. Recent work suggests that epithelial fluorescence increases, whereas stromal fluorescence decreases, with precancer. However, the microanatomic and biochemical sources of fluorescence in living cervical tissue have not yet been established. This study aims to characterize the origins of living normal and precancerous cervical fluorescence at microscopic levels using laser-scanning fluorescence confocal microscopy. Ten pairs of colposcopically normal and abnormal biopsies were obtained; transverse, 200 microm thick, short-term tissue cultures were prepared and imaged when viable with UV (351-364 nm) and 488 nm excitation before and after addition of the vital dye, Mitotracker Orange. In normal epithelium basal epithelial cells showed cytoplasmic fluorescence; parabasal, intermediate and superficial cells showed fluorescence only at the periphery of the cell. In low-grade precancers cytoplasmic fluorescence was visible in the bottom one-third of the epithelium; in high-grade precancers cytoplasmic fluorescence was visible throughout the lower two-thirds of the epithelium. Cytoplasmic fluorescence was colocalized with the MitoTracker probe and is attributed to mitochondrial reduced form of nicotinamide adenine dinucleotide at UV excitation and mitochondrial flavin adenine dinucleotide at 488 nm excitation. Stromal fluorescence originated from matrix fibers; with the development of precancer the density and fluorescence intensity of matrix fibers decrease. Autofluorescence properties of precancerous cervix reflect an increased number of metabolically active mitochondria in epithelial cells and a reduced stromal fluorescence, which can be an indicator for altered communication between precancerous epithelium and stroma. These changes can explain differences in in vivo fluorescence spectra of normal and precancerous cervical tissue.     

酪氨酸的分频荧光光谱研究

酪氨酸在300nm处产生一个荧光峰,在600nm处产生一个1／2分频荧光峰,在900nm处产生一个1／3分频荧光峰,此三峰具有相似的荧光特性。根据非线性光学分频荧光原理探讨了酪氨酸分频荧光峰产生的原因。     

Meso-四对甲氧基苯基卟啉荧光被Hg（Ⅱ）猝灭后荧光恢复的研究

通过 meso-四对甲氧基卟啉荧光被Hg2 猝灭后荧光恢复这一现象证明了卟啉的自组装行为.meso-四对甲氧基苯基卟啉丙酮溶液荧光加入Hg2 后猝灭,少量水的引入使卟啉通过氢键发生自组装,这时荧光恢复.Hg2 加入后立即发生猝灭,但是恢复却是比较缓慢的,连续加入Hg2 ,荧光呈周期性的猝灭和恢复.并且通过荧光光谱和紫外光谱论证了这一现象.     

三维同步荧光法研究喜树生物碱衍生物的荧光光谱性质

本文用三维同步荧光法详细研究了喜树生物碱衍生物的共性和特性,以及它们之间荧光光谱的变化过程,说明结构、取代基和溶剂在荧光光谱的变化中所起的作用,并用同步荧光法不经分离同时测定实际样品中的喜树碱和羟基喜树碱。     

External electric field effects on fluorescence of pyrene butyric acid in a polymer film: concentration dependence and temperature dependence

Fluorescence spectra and electrofluorescence spectra (plots of the electric field-induced change in fluorescence intensity as a function of wavelength) have been measured at different temperatures for pyrene butyric acid (PBA) in a PMMA film at different concentrations. At a low concentration of 0.5 mol % where fluorescence emitted from the locally excited state of PBA (LE fluorescence) is dominant, LE fluorescence spectra show only the Stark shift in the presence of an electric field (F), which results from the difference in molecular polarizability between the ground and emitting states. At a high concentration of 10 mol % where the so-called sandwich-type excimer fluorescence (EX(1)) is dominant, both EX(1) and LE fluorescence are quenched by F. Another fluorescence assigned to a partially overlapped excimer (EX(2)) also exists at room temperature, and this emission is enhanced by F. As the temperature decreases, three fluorescence emissions whose electric field effects are different from each other become clear besides EX(1) and LE fluorescence, indicating that at least five fluorescence components exist at high concentrations at low temperatures. At a medium concentration of 5 mol % where EX(1) is comparable in intensity to the LE fluorescence, the intensity of EX(1) is not affected by F at any temperature, but LE fluorescence and EX(2) are markedly influenced by F at room temperature, and four fluorescence emissions are confirmed at low temperatures.     

Study on the Interaction of Pentachlorophenol with Urease in Aqueous Solution by Multiple Spectroscopic Techniques

The interactions between pentachlorophenol (PCP) and jack bean urease were studied using UV/vis absorption, CD, fluorescence, synchronous fluorescence, and three-dimensional fluorescence spectroscopic techniques. The fluorescence data showed that the fluorescence quenching of urease by PCP the results of the formation of a PCP–urease complex involving a hydrophobic interaction. The distance r between the donor (urease) and acceptor (PCP) was obtained from the fluorescence resonance energy transfer. The effect of PCP on the conformation of urease was analyzed using UV/vis absorption, synchronous fluorescence and three-dimensional fluorescence spectroscopic techniques. The result showed that PCP can enter into the hydrophobic pocket at the interface of urease and that the micro environments around the tyrosine and tryptophan residues were changed.