红薯提取液荧光猝灭的Zn2+检测

人体大量摄入锌时易引起中毒,对锌污染的监测十分重要[1,2].锌离子的检测方法主要有电化学分析法[3-5]、光化学分析法[6,7]、原子吸收分光光度法[8]等.     

近红外Cu2+比率荧光探针合成及其细胞成像

基于罗丹明染料和菁染料衍生物,设计合成了一种新型近红外比率Cu2+荧光探针(RCy7).通过核磁共振和质谱对其结构进行了表征.详细研究了该荧光探针对Cu2+的光学识别性能.在体积比为1∶1的乙腈/Tris-HCl(20 mmol/L,pH=7.2)缓冲溶液中,探针RCy7显蓝色且在722 nm波长处有较强的荧光发射峰,...     

分子动力学模拟研究荧光分子芘在磺基甜菜碱胶束中的增溶

采用分子动力学模拟研究了荧光分子芘在磺基甜菜碱两性表面活性剂聚集体中的增溶现象．结果表明,芘分子自发地自溶液中增溶进入胶束疏水内核的栅栏层区域．当胶束溶液中芘分子的局部浓度增大时,两个芘分子可以同时增溶进胶束的栅栏层区域,此时两个芘分子形成π-π共轭堆积的激发态络合物．但是由于荧光分子之间的弱兀．兀相互作用,激发态络合物在胶束中是不稳定的,表现为两个芘分子的多次结合和分离．模拟表明,分子动力学方法可以在分子水平上研究荧光探针分子在表面活性剂胶束中的增溶位点,解释荧光分子在胶束中的动力学现象．     

高效毛细管电泳电导检测对阴离子表面活性剂分离测定的研究

以Ca2 +为分离介质 ,甲酰胺为添加剂 ,通过对缓冲体系、缓冲液浓度、酸度、Ca2 +浓度、甲酰胺浓度、电泳电压和进样时间的优化选择 ,用毛细管电泳 -电导检测法分离了十二烷基硫酸钠(K12)和十二烷基苯磺酸钠(LAS) ;在10mmol/LTris -11mmol/LCit(pH4.5)运行缓冲液中 ,上述两组分在16min内完全分离 ;K12和LAS的线性范围分别为5.0×10-6～8.0×10-3 mol/L和5.0×10-6 ～5.0×10-3 mol/L ;检出限(S/N=3)分别为2.5×10-6 和3.0×10-6 mol/L,应用于合成洗衣粉样和合成水样中K12 和LAS测定 ,结果令人满意。     

对Zn2+及S2-连续响应的罗丹明B酰肼类荧光探针的研究

该文采用简单的两步反应合成了一种新型N-(2-羟基-5-氯苯)基罗丹明B酰肼(HCPRH)分子探针,并对其进行了结构表征及荧光性能研究。结果显示,在含HCPRH分子探针的N,N-二甲基甲酰胺(DMF)溶液中加入Zn~(2+),会使其荧光显著增强,可在365 nm紫外灯下肉眼观察到体系颜色迅速由无色变为亮黄色,表明该分子探针可用于Zn~(2+)的快速、灵敏和裸眼识别,且其对Zn~(2+)具有良好的识别选择性,其它金属离子几乎不干扰HCPRH探针对Zn~(2+)的响应。采用Benesi-Hildebrand方程计算得HCPRH分子探针与Zn~(2+)之间形成了稳定的配合物,以Job?s法确定两者之间摩尔比为1∶1。根据荧光滴定的实验结果,发现HCPRH分子探针在512 nm处荧光发射峰强度变化值与Zn~(2+)浓度在10～250μmol/L之间呈良好的线性关系,对Zn~(2+)的检出限达3.6μmol/L,可用于其微量检测。另外,实验研究还表明该分子HCPRH探针可成功用于对Zn~(2+)与S~(2-)的连续荧光响应。     

基于肉桂酰肼的Zn2+、Mg2+和Cd2+Turn-On型荧光探针研究

本文以肉桂酸甲酯、水合肼及水杨醛为原料,设计合成了一种“turn-on”型离子选择性荧光探针,采用NMR、IR及HRMS对其结构进行了表征,结果表明该探针为N’-[(2-羟苯基)亚甲基]-3-{2-[(2-羟苯基)亚甲基]肼-1-基}-3-苯丙酰肼(ZL)。基于其存在的酰基和邻羟苯基亚甲基胺结构,研究了其对不同金属离子的识别作用,结果Zn²⁺、Mg²⁺和Cd²⁺对探针ZL荧光表现出“turn-on”效应,其荧光分别增强了47、21、24倍,而其他金属离子对其荧光光谱及强度无影响,化合物ZL表现出对Zn²⁺、Mg²⁺和Cd²⁺的高选择性识别和高灵敏检测,其检出限分别为5.5nmol·L^-1、8.4nmol·L^-1、9.9 nmol·L^-1。通过Job’s plot实验表明ZL与Zn²⁺、Mg²⁺和Cd²⁺的结合比为1∶1,结合核...     

氧化铝-延展型表面活性剂的吸附胶束及其吸附增溶

合成了一系列直链烷基聚氧丙烯醚硫酸钠(C_cP_pS, c=8或16时, p=9;c=12时, p=3, 6或9)并鉴定了其结构. 与十二烷基硫酸钠(SDS)类似, C₁₂P₉S在氧化铝上的饱和吸附量以及对阳离子染料亚甲基蓝的吸附增溶行为共同证实该延展型表面活性剂在表面上形成了双层吸附胶束, 但由聚氧丙烯(PPO)连接基导致的橄榄球状分子及其导致的较大分子吸附面积, 使其吸附能力及其对亚甲基蓝的吸附增溶能力均稍弱于SDS. C₁₂P₉S@Al₂O₃对弱极性分子1-苯乙醇和难溶性分子苯乙烯的吸附增溶能力均明显强于SDS, 而且对1-苯乙醇的吸附增溶量达到SDS@Al₂O₃的8.5倍, 说明1-苯乙醇主要被增溶在C₁₂P₉S双层吸附胶束中PPO连接基所在的膨大部位, 这使延展型表面活性剂改性的氧化铝在废水处理和药物传递系统等领域具有潜在的应用前景.     

表面活性剂存在下邻氯苯基荧光酮荧光熄灭法测定钒的研究

本研究了表面活性剂存在下，邻氯苯基荧光酮与钒（Ⅴ）的荧光行为，建立了高灵敏度测定钒的荧光熄灭法。钒与邻氯苯基荧光酮的络合比为１：２。邻氯苯基荧光酮量子产率变化△Ф＝０．１９５。方法检测限为４×１０＾－１１ｍｏｌ／Ｌ。     

表面活性剂对CdSe量子点荧光性能的影响

通过添加不同类型的表面活性剂在水相中制备了CdSe量子点。用透射电子显微镜(TEM)、X射线衍射(XRD)、X-射线光电子能谱(XPS)对其进行了表征,并用紫外-可见(UV-Vis)和荧光(PL)分光光度法研究了不同类型的表面活性剂对CdSe量子点吸收光谱和荧光光谱的影响。结果表明,加入长链的非离子型和阴离子型表面活性剂制备的CdSe量子点颗粒只有几个纳米,分散性好,量子点的荧光强度也有明显的增强,而加入阳离子表面活性剂制备的量子点颗粒团聚明显,其荧光出现淬灭。     

交联壳聚糖树脂与Zn2+的配位作用

研究了甲醛、环氧氯丙烷交联壳聚糖树脂(Chitosan crosslinked by aldehyde and epichlorohydrin,AECTS)吸附Zn2 后对树脂结构及性能所产生的影响.用FTIR、XRD、TG、DSC和SEM对吸附产物进行了结构表征,并分析了AECTS与Zn2 之间的作用机理.结果表明,Zn2 与AECTS中的氨基发生配位而被吸附;AECTS吸附Zn2 后,结晶度下降、总体上热稳定性变差;Zn2 对AECTS的主链分解具有明显的催化功能;Zn2 的配位使得AECTS的表面形态发生了改变.     

Non-Aqueous Capillary Electrophoresis with Indirect Photometric Detection for Direct Analysis of Pb2+, Zn2+ and Cd2+ Ions

A new approach, based on non-aqueous capillary electrophoresis separation and indirect photometric detection, was established for the determination of the transition metal ions Pb²⁺, Zn²⁺ and Cd²⁺. Under optimized conditions, the method produced baseline separation of these three metal ions. The linear range and detection limits were 1050µM, 1.9µM for Cd²⁺; 1050µM, 2.1µM for Zn²⁺; and 20100µM, 3.8µM for Pb²⁺, respectively.     

镧系金属有机骨架比例荧光检测萘普生

该文构筑了双荧光发射的比例型荧光传感器,并将其用于萘普生检测。以Eu3+为金属节点,1,3,5-苯三甲酸为配体,通过超声法合成了比例型荧光传感材料Eu-MOF。探究了Eu-MOF的形貌特征、光学性质及对萘普生的检测机理。单一激发光照射下,Eu-MOF呈现源于配体和Eu3+的双荧光发射峰。萘普生的荧光发射峰与Eu-MOF在375 nm处的荧光发射峰重合,且两者之间具有内滤光效应。因此,随着萘普生的逐渐加入,Eu-MOF在375 nm处的荧光发射峰强度逐渐增强,而623 nm处则逐渐减弱,从而可实现对萘普生的比例荧光检测。Eu-MOF检测萘普生的线性范围为0.07~2.3μmol/L,检出限为0.039μmol/L。Eu-MOF在萘普生的检测中表现出良好的选择性和抗干扰能力,是实际样品中萘普生检测的优势材料。     

比率式荧光纳米氧传感器

比率式荧光传感通过在同一传感基质中掺杂两种或两种以上对分析物具有不同响应的发光体,根据不同的光发射信号比值构建起来的光化学传感体系,能更好满足实际检测的需要。近年来,比率式荧光纳米传感器的构建已引起了人们的广泛关注。该文介绍了比率式荧光纳米氧传感器的制备方法、传感特性和应用情况,并对其传感检测的发展和应用前景进行了分析和展望。     

Monochromophore-Based Phosphorescence and Fluorescence from Pure Organic Assemblies for Ratiometric Hypoxia Detection

Hypoxia is a parameter related to many diseases. Ratiometric hypoxia probes often rely on a combination of an O₂-insensitive fluorophore and an O₂-sensitive phosphor in a polymer matrix, which require high cost and multi-step synthesis of transition metal complexes. The two-chromophore hypoxia probes encounter unfavorable energy transfer processes and different stabilities of the chromophores. Reported herein is a pure organic ratiometric hypoxia nanoprobe, assembled by a monochromophore, naphthalimide ureidopyrimidinone (BrNpA-UPy), bridged by a bis-UPy-functionalized benzyl skeleton. The joint factors of quadruple hydrogen bonding, the rigid backbone of UPy, and bromine substitution of the naphthalimide derivative facilitate bright phosphorescence (Φ_P=7.7 %, τ_P=3.2 ms) and fluorescence of the resultant nanoparticles (SNPs) at room temperature, which enable accurate, ratiometric, sensitive oxygen detection (K_sv=189.6 kPa⁻¹) in aqueous solution as well as in living HeLa cells.     

基于2-(2′-吡啶基)苯并咪唑的Zn2+比例计量型荧光识别

本文以荧光分子2-(2'-吡啶基)苯并咪唑(2-PBI)作为1,1'-联(2-芳杂环)类化合物模型.研究利用其2,2'-N原子螯合Zn2 导芳环共面化和荧光发射红移实现Zn2 比例计量检测的可行性.2-PBI在不同体系中的Zn2 荧光响应行为表明Zn2 结合将导致最大发射波长明显红移(乙腈36 nm;HEPES缓冲液39 nm).具有比例计量型Zn2 荧光探针的基本特点.2-PBI还具有显著的Zn2 荧光响应选择性,可以同时作为构建比例计量型探针的信号团和受体的基本骨架.通过对2-BPI的荧光机制和Zn2 识别行为的分析,提出了以2-PBI为基本骨架构建实用化比例计量型探针的途径.     

Anthracylmethyl Benzoazacrown Ether as Selective Fluorescence Sensors for Zn^2＋

A new benzoazacrown ether fluorescence sensor was synthesized with 9-anthrylmethyl chloride and benzoaza-15-crown-5 in CH3CN, which particularly shows a strong affinity for Zn^2 .Its fluorescence quantum yield increase more than one order of magnitude and a red shift could be noticed when passing from the apolar to the polar solvent.     

Microcalorimetric Study of the Biological Effects of Zn^＋ on Bacillus thuringiensis Growth

A microcalorimetric technique was used to investigate the influence of Zn^2 on the growth metabolism of Bacillus thuringiensis .LKB-2277 Bioactivity Monitor was employed to obtain the power-time curves,from which the maximum peak-heat output power(Pmax) in the log phase,the growth rate constants(k), the inhibitory ratios(I) ,the generational time(tG) and the total heat effect (Qtotal) in 23 h for the growth metabolism of Bacillus thuringiensis at 28℃ can be evaluated,The results indicate that the concentration of Zn^2 affects its growth obviously,Low concentration (0-50μg/mL) of Zn^2 promotes the growth of Bacillus thuringiensis while high concentration (50-500μg/mL) of Zn^2 inhibits its growth .When the concentration reached up to 600μg/mL,it can not grow at all.     

Na+ Selective Fluorescent Tools Based on Fluorescence Intensity Enhancements,Lifetime Changes,and on a Ratiometric Response

Over the years, we developed highly selective fluorescent probes for K⁺ in water, which show K⁺-induced fluorescence intensity enhancements, lifetime changes, or a ratiometric behavior at two emission wavelengths (cf. Scheme 1, K1 – K4 ). In this paper, we introduce selective fluorescent probes for Na⁺ in water, which also show Na⁺ induced signal changes, which are analyzed by diverse fluorescence techniques. Initially, we synthesized the fluorescent probes 2 , 4 , 5 , 6 and 10 for a fluorescence analysis by intensity enhancements at one wavelength by varying the Na⁺ responsive ionophore unit and the fluorophore moiety to adjust different K_d values for an intra- or extracellular Na⁺ analysis. Thus, we found that 2 , 4 and 5 are Na⁺ selective fluorescent tools, which are able to measure physiologically important Na⁺ levels at wavelengths higher than 500 nm. Secondly, we developed the fluorescent probes 7 and 8 to analyze precise Na⁺ levels by fluorescence lifetime changes. Herein, only 8 (K_d=106 mm ) is a capable fluorescent tool to measure Na⁺ levels in blood samples by lifetime changes. Finally, the fluorescent probe 9 was designed to show a Na⁺ induced ratiometric fluorescence behavior at two emission wavelengths. As desired, 9 (K_d=78 mm ) showed a ratiometric fluorescence response towards Na⁺ ions and is a suitable tool to measure physiologically relevant Na⁺ levels by the intensity change of two emission wavelengths at 404 nm and 492 nm.     

Effect of Zn2+ Ions on Upconversion Emission of Er3+ in Zn/Er:LiNbO3 Crystal

The effect of Zn2+ ions codoped on the upconversion emission of Er3+ ions in Er:LiNbO3 crystal under different excitation wavelength was reported.The upconversion emission spectra of Zn/Er:LiNbO3 follo...