丁香对低密度脂蛋白氧化过程中荧光特性变化的影响

低密度脂蛋白(LDL)氧化修饰是导致动脉粥样硬化(AS)的关键因素,LDL在氧化修饰过程中荧光特性会发生一系列改变。为评价丁香对LDL氧化过程中荧光的抑制效果,采用传统荧光及三维荧光等高线光谱研究丁香对LDL氧化修饰过程中荧光特性的影响。结果显示： LDL氧化孵育荧光特性的最佳测定时间为48 h;丁香粗提物对LDL氧化修饰过程中色氨酸(Trp)荧光猝灭、荧光发色团红移、氧化产生的活性醛修饰apoB 100所含赖氨酸(Lys)残基变化、荧光物质和脂褐素产生及三维荧光的变化均具有较好的抑制作用,且抑制作用与粗提物浓度成正相关。在此基础上进一步发现,丁香各极性成分(正己烷相(丁香精油)、乙酸乙酯相、正丁醇相及水相)对LDL氧化修饰过程荧光特征的变化影响不一。其中,正己烷相对Trp荧光猝灭、荧光发色团红移及三维荧光变化的抑制作用最强,而乙酸乙酯相抑制活性醛修饰Lys残基、荧光物质和脂褐素的产生效果最好。结果表明,丁香对LDL氧化修饰过程中荧光特性的变化具有较好的抑制作用,抑制作用的主要物质集中在正己烷相和乙酸乙酯相。该研究为后续丁香组成分析及其功能食品研发提供参考。     

五种四环类抗生素的固体表面荧光法的研究

五种四环类抗生素的固体表面荧光法的研究解宏智，董川，刘长松，赵丽霞，杜学勤（山西大学化学系，太原，０３０００６）关键词固体表面荧光，碱性降解，四环类抗生素四环类抗生素的亲癌作用使其成为诊断和治疗肿瘤的荧光探针［１］，基于该类抗生素碱性降解速率的差异［...     

氯化血红素作为模拟酶荧光免疫分析乙肝表面抗原

乙肝表面抗原的测定在临床诊断上是一项很重要的指标．现在一般采用酶联吸附免疫分析技术测定，但是酶本身性质不稳定且价格昂贵、操作繁琐；更重要的是大分子的酶作为标记物，由于空间位阻效应而阻碍抗原-抗体的免疫反应．所以，用小分子催化剂代替大分子酶的研究显得日益重要[1，2]．近年来有关模拟酶在免疫分析中的应用已有报道[3，4]．本文提出了以氯化血红素作为辣根过氧化物酶（HRP）的模拟酶来标记抗体，以盐酸硫胺素（维生素B1）作为供氢体，成功地实现了乙肝表面抗原（HBsAg）的夹心法荧光免疫分析．测定范围是2．5～500ng／wel…     

The Spatial-Temporal Correlations of Resonance Fluorescence

The spatial-temporal correlations of resonant fluorescence from a single two-level atom is studied based on the investigation of different photocurrent correlations after homodyning the fluorescence with a local oscillator. It is found that the nonclassical features of the measured field is position-dependent on the detection plane.     

萘酰亚胺铁离子荧光探针的合成及识别性能

以1,8-萘酐、N,N-二甲基乙醇胺、三乙烯四胺为原料,通过酰亚胺化、缩合等反应,合成一种萘酰亚胺荧光探针,并通过核磁氢谱、红外光谱结构表征,测定了探针在乙醇与水的混合溶液中的荧光光谱。考察了金属离子浓度等因素的影响,对其配位机理进行了研究。结果显示,目标产物在乙醇-水溶液中对Fe~(3+)表现出了专属选择性识别性能,在(1.87~6.53)×10~(-6)g/m L的Fe~(3+)浓度范围内,探针荧光强度与Fe~(3+)浓度有很好的线性关系,线性相关系数R=0.995 3,检出限为405.1 ng/mL。     

Light harvesting and energy transfer within coumarin‐labeled polymers

Linear copolymers that have pendant coumarin‐2 and coumarin‐343 chromophores were prepared as analogues to previously synthesized light‐harvesting dendrimers. The chromophore ratios within these polymers were maintained similar to those of the various generation dendrimers to investigate the effect of polymer architecture on the energy‐transfer efficiency between the coumarin‐2 donors and coumarin‐343 acceptors. Both physical and photophysical properties of these polymers were analyzed and compared to those of the analogous dendrimers. Energy‐transfer efficiencies were relatively high in the polymers; however, deleterious excimer formation between the coumarin‐343 chromophores diminished the quantum yield of fluorescence of the polymers when compared to the analogous dendrimers. Overall, it was found that the ultimate performance of the dendritic light‐harvesting antennae was superior to that of the polymeric analogues, but the polymers were more practical in terms of synthetic accessibility. © 2001 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 39: 1366–1373, 2001     

Novel sulfonated hydrophilic indium(III) and gallium(III) phthalocyanine photosensitizers: preparation and investigation of photophysicochemical properties

The new tetra-non-peripherally benzenesulfonic acid-substituted hydrophilic gallium chloride and indium chloride phthalocyanine complexes have been synthesized by cyclotetramerization of 4-(2,3-dicyanophenyl)benzenesulfonic acid (1). The newly synthesized phthalocyanines have been characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance, mass and UV–vis spectroscopy techniques. The water-soluble gallium(III) phthalocyanine derivative (2) was aggregated in aqueous media but was fully disaggregated in the presence of a surfactant Triton X-100. The incorporation of sulfonate moieties of the phthalocyanine macrocycle provides hydrophilic character to the new compounds, which is useful for drug administration and serves as crucial in PDT application. So, the photochemical properties (singlet oxygen quantum yields and photodegradation quantum yields) and photophysical properties (fluorescence behavior) of the complexes were reported in different solutions (DMSO and water). The results of spectral measurements showed that both np-GaPc (2) and np-InPc (3) can be used as sensitizers in PDT because of their singlet oxygen efficiencies.     

积分光荧光测试在三代微光像增强器光阴极制作中的应用

本文基于半导体材料积分光荧光测试的原理,叙述在三代微光像增强器光阴极组件制作工艺过程中光荧光强度的变化规律及其测试结果,对其作出理论解释,并且说明如何依此规律对工艺过程进行监控。     

新型萘酰亚胺类硫氰酸根离子荧光探针的合成及应用

设计合成了一个萘酰亚胺类SCN^-离子探针NNN,其合成方法简单,条件温和。能够在水溶液中专一识别SCN^-离子,检测浓度最小可以达到20 μmol/L,随着SCN^-离子的加入,化合物NNN吸收光谱蓝移了60 nm,从黄色变为无色,这种明显的颜色变化,有利于可视观察。通过双波长比例变化,可以实现SCN^-离子20 μmol/L~0.8 mmol/L范围内的定量检测。SCN^-离子能够猝灭化合物NNN的荧光,荧光强度前后变化明显,荧光量子产率由原来的0.33减弱到0.02。通过荧光光谱和吸收光谱两种手段实现对SCN^-的检测,选择性好,灵敏度较高。     

荧光标记C_(12)～C_(20)等脂肪酸在反相高效液相色谱系统中的超微量分析

对Ｃ１２～Ｃ２０等脂肪酸在反相高效液相色谱（ＨＰＬＣ）系统中的超微量分析进行了研究。月桂酸、肉豆蔻酸、棕榈酸、硬脂酸、花生酸等有机酸在所选择的色谱条件下都能得到有效的分离，采用Ｃ１８键合相的色谱柱，流动相采用甲醇∶水＝９７∶３，流速为１．５ｍＬ／ｍｉｎ，荧光检测波长为λｅｘ＝３２５ｎｍ，λｅｍ＝３９７ｎｍ。在实验中采用４－溴甲基－７－甲氧基香豆素作为Ｃ１２～Ｃ２０等脂肪酸的荧光标记物，以丙酮为溶剂，以１８－冠醚－６为催化剂，以碳酸钾为碱试剂，通过相转移催化完成衍生化反应。对方法的准确度、精密度及最小检出限进行了验证，最小检出限达到１０－７ｇ／Ｌ数量级