Novel Coumarin-based Fluorescent Probe for Selective Detection of Bisulfite Anion in Water

Coumarins and its analogues have been widely used as chromophore in design of fluorescent probe, while less coumarin‐based fluorescent probe was reported for detection of anion in water. In this article, coumarin‐based fluorescent probes with salicylaldehyde functionality as recognition unit have been developed for selective detection of bisulfite anions in water. Four novel fluorescent probes were synthesized from 4‐haloresorcinol in three steps. The chemoprobe exhibited selective response to bisulfite over other anions. Moreover, the detection mechanism was studied. Upon bisulfite added, the fluorescent intensity of the probes was enhanced highly due to the nucleophilic addition reaction of formyl group with bisulfite anion.     

香豆素类比率荧光探针的合成及其对亚硫酸盐与硫化氢的区分检测

基于迈克尔加成反应和分子内电荷转移机理设计合成了一个比率型荧光探针MSP,并将其用于对亚硫酸盐和硫化氢的区分检测。强吸电子基团丙二腈的引入,使得探针的吸收和发射波长红移,同时极大地提高了探针与亚硫酸盐的反应速率,实现了对亚硫酸盐的快速检测。当反应时间延长至3 h时,硫化氢的存在使得探针的荧光波长蓝移至510 nm且强度显著增强,探针在两个波长下的荧光比率(I510/I690)增强约260倍,实现了在不同响应时间和不同光谱通道区分检测亚硫酸盐与硫化氢的目的。该探针具有良好的选择性和竞争性,可分别利用吸收强度比值(A464/A572)和荧光强度比值(I510/I690)定量检测亚硫酸盐和硫化氢,两者检出限分别为0.95μmol/L和0.6μmol/L。该探针还能用于对活细胞内亚硫酸盐和硫化氢的荧光成像。     

A Highly Selective Turn-On Fluorescent Probe for the Detection of Zinc

A novel turn-on fluorescence probe L has been designed that exhibits high selectivity and sensitivity with a detection limit of 9.53 × 10⁻⁸ mol/L for the quantification of Zn²⁺. ¹H-NMR spectroscopy and single crystal X-ray diffraction analysis revealed the unsymmetrical nature of the structure of the Schiff base probe L. An emission titration experiment in the presence of different molar fractions of Zn²⁺ was used to perform a Job’s plot analysis. The results showed that the stoichiometric ratio of the complex formed by L and Zn²⁺ was 1:1. Moreover, the molecular structure of the mononuclear Cu complex reveals one ligand L coordinates with one Cu atom in the asymmetric unit. On adding CuCl₂ to the ZnCl₂/L system, a Cu-Zn complex was formed and a strong quenching behavior was observed, which inferred that the Cu²⁺ displaced Zn²⁺ to coordinate with the imine nitrogen atoms and hydroxyl oxygen atoms of probe L.     

Intramolecular Charge Transfer (ICT) Based Two-photon Fluorescent Probe for Bisulfite with Bioimaging Applications

Abstract

A two-photon fluorescent probe has been adopted for bisulfite based on an intramolecular charge transfer (ICT) mechanism. The fluorescence intensity of the probe decreased by 837 fold following treatment with HSO₃^? and the detection limit was 42?nM. This probe showed excellent properties such as high photostability, good two-photon properties, and large Stokes shifts. More importantly, this approach offers a rapid, highly selective, and sensitive method to determine HSO₃^? in buffer solutions and real samples. Furthermore, the probe was successfully used for two-photon fluorescence visualization of trace SO₂ derivatives in biological systems.     

一个基于丹磺酰基的荧光探针的合成和表征

合成和表征了一种带有丹磺酰基荧光团的新荧光探针,用荧光光谱测试了它对金属离子的响应。探针的高氯酸盐晶体结构显示苯并咪唑环上的氮原子N(4)被质子化了。实验结果表明探针对Fe3+有好的选择性,并与Fe3+形成了1∶1计量比的配合物。     

一种基于苯并噁唑类的可视化检测汞离子的荧光探针

设计合成了一种用于检测Hg²⁺的苯并噁唑类荧光探针4-(苯并[d]噁唑-2-基)-2-((二(2-(乙巯基)乙基)氨基)甲基)苯酚(ZY1), 用质谱、核磁氢谱和X射线单晶衍射等方法对其进行了结构表征, 并考察了其光谱性能. 研究结果表明, ZY1对Hg²⁺有较高的选择性和灵敏度, 它们之间的结合比为1:1, 共存离子及pH值(3.0～9.0)对其测定影响小. ZY1能够可视化检测Hg²⁺, 并在HeLa活细胞中实现了汞离子的成像, 这对检测生物体内的Hg²⁺将具有潜在的应用价值.     

选择性检测谷胱甘肽的荧光探针

本文设计合成了一种基于BODIPY衍生物选择性检测谷胱甘肽的比率式荧光探针1。荧光探针1中BODIPY的3位连有苯乙炔基团,5位连有咪唑盐离去基团,利用其与谷胱甘肽和半胱氨酸反应机理的不同实现了对谷胱甘肽的选择性检测。紫外可见吸收光谱和荧光光谱实验结果表明探针分子1与谷胱甘肽反应后的光谱发生明显红移,可以实现对谷胱甘肽的比率式检测。探针分子1对谷胱甘肽有极高的选择性,不受其它氨基酸尤其是半胱氨酸的干扰。荧光滴定实验表明探针分子1可实现对谷胱甘肽的定量检测,检测限为3.3×10-8 mol/L。探针分子成功地应用于活体细胞中检测谷胱甘肽。     

一种检测亚硫酸氢根的苯并咪唑类荧光增强型探针及其实际应用

合成和表征了一种用于检测HSO3^-的苯并咪唑类荧光增强型探针(FP1)。结果表明:FP1对HSO3^-表现出了明显的荧光关-开响应,具有高的选择性和灵敏度,且抗干扰能力强,响应时间短(2 min)。FP1的荧光强度与HSO3^-的浓度在1.2~8.1μmol·L^-1的范围内呈线性关系,其对HSO3^-的检出限为0.14μmol·L^-1。此外,FP1能用于实际样品中HSO3^-的检测,回收率良好,它还可应用于HeLa活细胞中对HSO3&-进行荧光成像。     

近红外荧光探针及其在生物分析中的应用进展

本文评述了自1999年以来近红外荧光探针和标记试剂及其在生物分析中的应用进展。包括:菁染料、噻嗪和噁嗪染料、含四吡咯基团染料(酞菁和卟啉)、罗丹明类、BODIPY、稀土离子配合物和量子点等。描述了它们在荧光测定和毛细管分离荧光检测以及免疫荧光分析方面的应用。引用文献75篇。     

An ESIPT-Based Ratiometric Fluorescent Probe for Highly Sensitive and Rapid Detection of Sulfite in Living Cells

The novel ratiometric fluorescent probe HPQRB with an ESIPT effect based on Michael addition for highly sensitive and fast detection of sulfite in living HepG2 cells is reported. HPQRB can be easily synthesized by a two-step condensation reaction. HPQRB has a large emission shift (Δλ=116 nm), which is beneficial for fluorescence imaging research, and its sulfite-responsive site is based on a rhodamine-like structure with the emission peak at 566 nm, which decreases with increasing sulfite concentration. and its HPQ structure always has an ESIPT effect throughout the reaction process, keeping the emission peak at 450 nm as a self-reference. In particular, HPQRB has high selectivity for sulfite and responds quickly (within 30 s) with a low detection limit (44 nM). Furthermore, HPQRB has been successfully used for fluorescence imaging of sulfite in HepG2 cells, demonstrating the superior ability to detect sulfite under physiological conditions.     

A Novel Fluorescence Probe for the Reversible Detection of Bisulfite and Hydrogen Peroxide Pair in Vitro and in Vivo

The detection of changes in the reactive oxygen species (ROS)/reactive sulfur species (RSS) couple is important for studying the cellular redox state. Herein, we developed a 1,8-naphthalimide-based fluorescence probe ( NI ) for the reversible detection of bisulfite (HSO₃⁻) and hydrogen peroxide (H₂O₂) in vitro and in vivo. NI has been designed with a reactive ethylene unit which specifically reacts with HSO₃⁻ by a Michael addition reaction mechanism, resulting in the quenching of yellow fluorescence at 580 nm and the appearing of green fluorescence at 510 nm upon excitation at 500 nm and 430 nm, respectively. The addition product ( NI−HSO₃ ) could be specifically oxidized to form the original C=C bond of NI , recovering the fluorescence emission and color. The detection limits of NI for HSO₃⁻ and NI−HSO₃ for H₂O₂ were calculated to be 2.05 μM and 4.23 μM, respectively. The reversible fluorescence response of NI towards HSO₃⁻/H₂O₂ couple can be repeated for at least five times. NI is reliable at a broad pH range (pH 3.0–11.5) and features outstanding selectivity, which enabled its practical applications in biological and food samples. Monitoring the reversible and dynamic inter-conversion between HSO₃⁻ and H₂O₂ in vitro and in vivo has been verified by fluorescence imaging in live HeLa cells, adult zebrafish and nude mice. Moreover, NI has been successfully applied to detect of HSO₃⁻ levels in food samples.     

基于新型不对称BODIPY的GSH荧光探针

本文通过在BODIPY母体中引入丙二腈,设计合成了一个新型不对称BODIPY荧光染料CN-B-Cl。由于丙二腈强吸电作用,荧光染料CN-B-Cl具有优异的化学活性,能够与含巯基的化合物在buffer体系中迅速发生芳香亲核取代反应;与GSH反应生成硫取代BODIPY,而与Cys/Hcy反应生成氮取代BODIPY。根据不同取代基BODIPY化合物发光性能的不同,该荧光探针可选择性区分GSH与Cys/Hcy。     

一种基于苯并噻唑的新型过氧亚硝酸盐荧光探针的合成及应用

该文以2-(2′-羟基-3′-醛基-5′-甲基苯基)苯并噻唑和1,1-二甲基肼为原料,通过一步缩合,简单过滤处理得到一种基于苯并噻唑的新型ONOO^-荧光探针BD。但由于N—N单键旋转产生非辐射能量损失,探针BD荧光较弱。在引入ONOO^-后,探针BD上的腙水解成醛基,N—N单键脱落,荧光增强,同时可观察到明显的颜色变化。在PBS缓冲溶液(DMSO∶H₂O=2∶8,体积比,pH 7.4)中,探针BD对ONOO^-具有快速响应(25 s)、高灵敏度(7 nmol/L)和高选择性的特点,可在较宽pH值范围内工作。此外,探针BD还成功地用于肝癌细胞中ONOO^-的荧光成像,因此,可作为揭示ONOO^-在细胞中作用的一个很有潜力的分析工具。     

以香豆素为母体快速检测内源性甲醛的荧光探针

基于甲醛(FA)与肼易发生亲核加成反应,从而阻断肼与荧光母体间电子传递的光诱导电荷转移(PET)机理,设计合成了以香豆素为母体的甲醛荧光探针3-苯并噻唑-7-肼香豆素(Coun)。 实验结果显示,Coun与FA的最佳反应时间为4 min,极大地提高了检测效率,检测限为5×10^-6 μmol/L。 该探针具有良好的细胞膜通透性,可应用于生物领域,检测细胞内的甲醛含量。     

A Turn‐On Fluorescent Probe for Highly Selective and Sensitive Detection of Palladium

A novel turn‐on fluorescent probe for the detection of palladium has been designed. The probe can selectively and sensitively detect palladium in solution, and the limit of detection was calculated to be 11.4 nmol·L^?1. Furthermore, the probe was successfully used for fluorescence imaging of palladium in living cells.     

一个基于NBD-NH2荧光团的增强型pH荧光探针及其细胞造影研究

本文以NBD-NH₂荧光团偶联N-(4-吡啶甲基)乙二胺质子受体构建了基于光致电子转移(PET)机制的pH探针NBD-Py。探针在pH5.0~8.5范围内显示pH降低导致的荧光增强响应,pK_a为6.48。响应不受胞内常见金属离子干扰且有良好的可逆性。研究表明质子受体中引入4-甲基吡啶修饰乙二胺是探针实现对弱酸/近中性pH响应的关键。HeLa细胞中的造影证实了探针的pHi造影能力和溶酶体靶向性能,为溶酶体pH相关的生理过程研究提供了新的可靠手段。     

基于香豆素荧光团的新型极性检测荧光探针的开发及其成像应用

极性是生物微环境的重要参数之一, 在很大程度上, 生物体内许多生命活动都受到极性变化的影响, 本工作通过改变香豆素母体上的推-拉电子基团, 设计并合成了一种具有较大斯托克斯位移的新型极性荧光探针COM-PO, 该探针的荧光强度和波长会随着测试体系的极性变化而发生改变. 当极性增加时, COM-PO的激发态能量会通过偶极-偶极的相互作用散失在溶剂中, 荧光发射强度降低, 而在低极性溶剂中荧光发射强度增强, 利用这种特性实现了对极性的检测. 本工作通过荧光光谱、荧光成像实验表明COM-PO能够在样品中实现极性检测, 该探针有望实现与极性相关的疾病的早期诊断.     

A Two-Photon Fluorescent Probe for the Visual Detection of Peroxynitrite in Living Cells and Zebrafish

Peroxynitrite (ONOO⁻), as an important reactive oxygen species (ROS), holds great potential to react with a variety of biologically active substances, leading to the occurrence of various diseases such as cancer and neurodegenerative diseases. In this work, we developed a novel mitochondria-localized fluorescent probe, HDBT-ONOO⁻, which was designed as a mitochondria-targeting two-photon fluorescence probe based on 1,8-naphthylimide fluorophore and the reactive group of 4-(bromomethyl)-benzene boronic acid pinacol ester. More importantly, the probe exhibited good biocompatibility, sensitivity, and selectivity, enabling its successful application in imaging the generation of intracellular and extracellular ONOO⁻. Furthermore, exogenous and endogenous ONOO⁻ products in live zebrafish were visualized. It is greatly expected that the designed probe can serve as a useful imaging tool for clarifying the distribution and pathophysiological functions of ONOO⁻ in cells and zebrafish.     

一种基于菲并咪唑的新型次氯酸荧光探针及细胞成像研究

该文设计并合成了一种基于菲并咪唑的新型次氯酸荧光探针,该探针由商用试剂9,10-菲醌和4-(甲基巯基)苯甲醛通过一步反应生成,只需简单后处理(过滤和水洗)即可得到大量纯品(产率达85%)。由于硫的重原子效应,探针荧光较弱。但在次氯酸存在下,探针分子内的硫原子被氧化成亚砜,重原子效应减弱,同时分子内电荷转移效应(ICT)加强,导致荧光增强。借助高分辨质谱,证明了探针与次氯酸盐的反应机理。在PBS缓冲溶液中(DMF∶H₂O=2∶8,体积比,pH 7.4),探针MPI可定量检测0～100μmol/L范围内的HClO,检出限为0.26μmol/L。该探针对次氯酸具有较高的灵敏性和选择性。更重要的是,MPI具有良好生物相容性和细胞渗透性,可用于活细胞内次氯酸的可视化成像。探针MPI有望为机体内次氯酸的检测与追踪提供一种可靠、有效的方法。     

一个基于苯并噻唑的铜离子荧光探针合成、晶体结构和光谱性质

合成和表征了一个苯并噻唑类的荧光探针N-(4-(苯并噻唑-2-基)苯基)-2-((2-羟乙基)(吡啶-2-甲基)氨基)乙酰胺 (FL),用光谱法研究了它与各种金属离子的识别特性。结果表明:FL对Cu²⁺具有较高的选择性和灵敏度,并且对Cu²⁺的识别不受其它金属离子的干扰。FL与Cu²⁺形成配合物的结合比为1:1,其荧光强度与Cu²⁺浓度(3.8~9.6 μmol·L^-1)呈现较好的线性关系,而且它还可应用于自来水和湖水等水体样品中Cu²⁺的检测。