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以4-N,N-二乙基氨基水杨醛为原料,制备了2-(苯并噻唑-2-基)-5-(N,N-二乙基氨基)苯酚衍生物(探针L),并对其结构进行了表征。在DMSO/PBS(体积比3∶7,pH=7.4)溶液中,探针L具有高选择性并可荧光"关-开"识别H_2S,在365nm紫外灯照射下,由无荧光变成蓝色荧光。实验表明,探针L识别H_2S的检测限为2.05×10~(-6)mol/L,pH适用范围为6~9,可用于检测实际水样中的H_2S。 相似文献
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以1,4-二乙基-7-羟基四氢喹喔啉-6-甲醛为基础,设计合成了一种具有长波长发射、较大斯托克斯位移的新型肼二腙类荧光探针L.在探针L的二甲基亚砜(DMSO)溶液中加入Cu~(2+)和CO~(2+)后,溶液颜色由黄色分别变为粉色和无色,可裸眼识别Cu~(2+)和Co~(2+).利用L与Cu~(2+)形成的配合物,在DMSO/H_2O(V:V=7:3,HEPES,1×10~(-2)mol/L,pH=7.4)缓冲溶液中可荧光"OFF-ON"识别H_2S.试纸条实验表明,L-Cu~(2+)对不同浓度H_2S显色明显,可以通过裸眼和荧光双通道快速检测H_2S.此外,利用Discovery Studio分子模拟软件,通过分子L结构反向找靶,并用CDOCKER程序进行分子对接,发现分子L对2x0v蛋白(来自人类的P53蛋白)有很好的结合作用,有望在医药领域得到应用. 相似文献
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本文利用2-氨基吡啶与4-二乙胺基水杨醛反应合成了5-二乙胺基-2-(吡啶-2’-亚氨甲基)苯酚(探针L),对其结构进行了表征。在DMSO/Tris(6:4, v/v, pH =7.4)溶液中,探针L高选择性荧光“关-开”识别Zn2+,在365 nm紫外灯照射下,由无荧光变成蓝色荧光。实验表明,探针L与Zn2+的结合比为1:1,结合常数为2.6×103 L. mol-1,检测限为 9.39×10-7mol/L,pH适用范围为7-11,并可检测水样中的Zn2+。 相似文献
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本文设计合成了一种基于激发态分子内质子转移(ESIPT)机理的苯并噻唑类荧光探针TZ-1,并对其结构进行了表征。实验结果表明,在体积比1∶1的DMSO/PBS(10mmol/L,pH=7.4)溶液中,探针TZ-1具有高选择性并可在3s内实现荧光"off-on"(在365nm紫外灯照射下,由无荧光变成橙色荧光)识别S~(2-),检测限为81μmol/L,pH适用范围为6~12;此外,加入S~(2-)后探针TZ-1的DMSO/PBS溶液由无色变为浅黄色,通过裸眼即可识别S~(2-)。 相似文献
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《有机化学》2017,(4)
设计合成了一种新型咪唑并吩嗪内酰胺荧光传感器分子(S1),通过核磁共振氢谱、碳谱和高分辨质谱等手段对其结构进行了表征,并测定了S1在二甲基亚砜(DMSO)溶液中的荧光光谱,其最大荧光发射波长为524 nm.S1的DMSO溶液具有亮黄色荧光.当在S1的DMSO溶液中分别加入F~-,Cl~-,Br~-,I~-,AcO~-,H_2PO_4~-,HSO_4~-,ClO_4~-和SCN~-等阴离子后,发现只有CN~-的加入使S1的荧光光谱出现明显的下降并发生红移.其溶液荧光颜色由黄色变为橘红色,说明S1对CN~-具有良好的专一选择性.抗干扰实验结果表明,这一识别过程不受其它阴离子干扰.通过计算得到,S1对CN-的荧光光谱最低检测限为9.96×10~(-7)mol/L,这一数值低于世界卫生组织所规定的饮用水中氰离子含量.机理研究表明,S1是一种反应型识别CN~-的荧光传感器.此外,将S1负载于固态硅胶之上,制备成固体CN~-识别材料,并成功用于对固体NaCN的识别和对CN~-水溶液的检测. 相似文献
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本文设计合成了一种基于香豆素的荧光探针L,通过氢谱、质谱对其结构进行表征。该探针在DMSO/H_2O(体积比9∶1)体系中对Co~(2+)和Ni~(2+)具有较好的选择性和灵敏度。Co~(2+)和Ni~(2+)的加入使得探针L的荧光发射发生猝灭,其他金属离子未对探针的荧光产生明显的影响。探针L与Co~(2+)和Ni~(2+)的配位比均为1∶2,其对Co~(2+)和Ni~(2+)的检出限分别为1.002×10~(-7)和9.78×10~(-6) mol/L,结合常数分别是1.06×10~6和9.84×10~5 L·mol~(-1)。 相似文献
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A two-photon fluorescence turn-on H2S probe GCTPOC–H2S based on a two-photon platform with a large cross-section, GCTPOC, and a sensitive H2S recognition site, dinitrophenyl ether was constructed. The probe GCTPOC–H2S exhibits desirable properties such as high sensitivity, high selectivity, functioning well at physiological pH and low cytotoxicity. In particular, the probe shows a 120-fold enhancement in the presence of Na2S (500 μM), which is larger than the reported two-photon fluorescent H2S probes. The large fluorescence enhancement of the two-photon probe GCTPOC–H2S renders it attractive for imaging H2S in living tissues with deep tissue penetration. Significantly, we have demonstrated that the probe GCTPOC–H2S is suitable for fluorescence imaging of H2S in living tissues with deep penetration by using two-photon microscopy. The further application of the two-photon probe for the investigation of biological functions and pathological roles of H2S in living systems is under progress. 相似文献
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A FRET-based fluorescence probe was developed for selective detection of H2S in aqueous buffer and inside living cells. For this probe, the FRET probe could be cleaved by H2S, and the fluorescence of FRET donor is released. The probe is highly selective to H2S over other biologically relevant species to give color change for naked eye observation. Confocal imaging indicated that the probe could monitor intracellular H2S level changes. 相似文献
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Yi Zhang Xianhong Huang Wenwen Liu Guanxin Zhang Deqing Zhang Xingyu Jiang 《中国科学:化学(英文版)》2016,59(1):106-113
Hydrogen sulfide (H2S) has been found to be the third most important endogenous gaseous signaling molecule after nitric oxide (NO) and carbonic oxide (CO) and plays crucial roles in living organisms and biological systems. Here we use aggregation- induced emission (AIE) of a small organic molecule (TPE-indo) to detect H2S in both solution and living cells. TPE-indo can target mitochondria and aggregate to fluoresce, which can serve as a sensor for monitoring H2S in the mitochondria. We regulate the fluorescence of AIE molecules by tuning the viscosity of the solution to form TPE-indo nanoparticles, constructing a probe for H2S with good selectivity and high sensitivity. The nucleophilic addition of HS- to the TPE-indo is crucial for the rapid H2S detection. The imaging and analysis of H2S in mitochondria of living cells with the probe demonstrate potential biological applications. 相似文献
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Development of bioanalytical methods for selective and accurate detection of H2S in living samples is essential for understanding the pathological and physiological functions of this gasotransmitter in biological systems. Here we report a Golgi apparatus-targetable lanthanide complex-based luminescent probe, Golgi-ABTTA-Eu3+/Tb3+, that can be used for accurately determining H2S in aqueous solution and living cells via the ratiometric time-gated luminescence (RM-TGL) technique. This probe is composed of 2,2′:6′,2′′-terpyridine-Eu3+/Tb3+ mixed complexes as the luminophore, 4-azidobenzyl-ether as the responsive moiety, and sulfanilamide as the Golgi apparatus-targeting moiety. Upon reaction with H2S, accompanied by the cleavage of 4-azidobenzyl group from the probe molecule, the long-lived emission of Tb3+ complex at 540 nm is significantly enhanced, while that of Eu3+ complex at 610 nm is obviously reduced. It was noted that the I540/I610 ratio increased by 8.8 times after the probe was exposed to H2S, which enabled H2S to be detected with RM-TGL method. After being incubated with living cells, the probe molecules were selectively accumulated in the Golgi apparatus, which allowed H2S in the Golgi apparatus to be successfully imaged in RM-TGL mode. 相似文献
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In this paper, we utilized the instinct peroxidase-like property of Fe3O4 magnetic nanoparticles (MNPs) to establish a new fluorometric method for determination of hydrogen peroxide and glucose. In the presence of Fe3O4 MNPs as peroxidase mimetic catalyst, H2O2 was decomposed into radical that could quench the fluorescence of CdTe QDs more efficiently and rapidly. Then the oxidization of glucose by glucose oxidase was coupled with the fluorescence quenching of CdTe QDs by H2O2 producer with Fe3O4 MNPs catalyst, which can be used to detect glucose. Under the optimal reaction conditions, a linear correlation was established between fluorescence intensity ratio I0/I and concentration of H2O2 from 1.8 × 10−7 to 9 × 10−4 mol/L with a detection limit of 1.8 × 10−8 mol/L. And a linear correlation was established between fluorescence intensity ratio I0/I and concentration of glucose from 1.6 × 10−6 to 1.6 × 10−4 mol/L with a detection limit of 1.0 × 10−6 mol/L. The proposed method was applied to the determination of glucose in human serum samples with satisfactory results. 相似文献
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合成的3',6'-对戊酰硼荧光素是一种基于去保护机理的高灵敏H2O2荧光增强化合物, 能灵敏地检测出样品中H2O2的含量. 用IR, 1H NMR 对该探针的结构进行了表征, 并且讨论了反应时间、溶剂、碱对探针合成的影响. 研究了探针的最佳响应时间, 结果表明检测过程中反应的最佳时间为3 min. 该探针在2.3×10-12~2.0×10-8 mol/L H2O2溶液范围内呈荧光增强趋势, 检测下限为2.3×10-12 mol/L. 此探针重现性良好, 在血清中检测H2O2的回收率在93.9%~102.2%之间, 结果令人满意, 具有一定的实用价值. 相似文献
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Koushik Dhara Santanu Karan Jagnyeswar Ratha Partha Roy Goutam Chandra Mario Manassero Dr. Biswanath Mallik Dr. Pradyot Banerjee Dr. 《化学:亚洲杂志》2007,2(9):1091-1100
A 2D coordination compound {[Cu2(HL)(N3)]?ClO4}∞ ( 1 ; H3L=2,6‐bis(hydroxyethyliminoethyl)‐4‐methyl phenol) was synthesized and characterized by single‐crystal X‐ray diffraction to be a polymer in the crystalline state. Each [Cu2(HL)(N3)]+ species is connected to its adjacent unit by a bridging alkoxide oxygen atom of the ligand to form a helical propagation along the crystallographic a axis. The adjacent helical frameworks are connected by a ligand alcoholic oxygen atom along the crystallographic b axis to produce pleated 2D sheets. In solution, 1 dissociates into [Cu2(HL)2(H3L)]?2H2O ( 2 ); the monomer displays high selectivity for Zn2+ and can be used in HEPES buffer (pH 7.4) as a zinc ion selective luminescent probe for biological application. The system shows a nearly 19‐fold Zn2+‐selective chelation‐enhanced fluorescence response in the working buffer. Application of 2 to cultured living cells (B16F10 mouse melanoma and A375 human melanoma) and rat hippocampal slices was also studied by fluorescence microscopy. 相似文献
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Single crystal XRD structure of the lower rim 1,3-di-amide-derivative of calix[4]arene possessing bis-{N-(2,2′-dipyridylamide)} pendants (L) exhibit two distinct binding cores, viz., N4 and O6. L was found to be selective for Zn2+ by switch-on and for Ni2+ by switch-off fluorescence by forming 1:1 complexes. The binding and the composition of the complex formed have been addressed based on steady state and time-resolved fluorescence spectroscopy in addition to the absorption and ESI MS. As L can detect Zn2+ and Ni2+ to a concentration as low as 142 and 203 ppb, respectively, L can be a very sensitive molecular probe for these ions. The coordination details of the metal ion-bound complexes have been addressed based on ab initio calculations showing that the stabilization energies are commensurate with the coordination formed. 相似文献