共查询到19条相似文献,搜索用时 62 毫秒
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罗丹明类荧光染料由于具有摩尔消光系数高、光稳定性好、荧光量子产率高、较长的激发波长和发射波长等优异的光物理和光化学性能,现已成为制备荧光探针的一种理想材料之一。本文综述了近5年来基于螺酰胺环“关-开”机理和荧光共振能量转移(FRET)机理的罗丹明类Cu2+、Hg2+、Fe3+、Cr3+等荧光探针的设计合成、性能及其在阳离子分析方面的研究。介绍了具有良好细胞膜渗透性以及对细胞无毒副作用的罗丹明类阳离子荧光探针在活体或活细胞中应用研究的最新进展。并展望了这类荧光探针的发展趋势与应用前景。 相似文献
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一种罗丹明类次氯酸荧光探针的合成与分析应用 总被引:1,自引:0,他引:1
通过一步反应合成了一种次氯酸(HOCl)荧光探针罗丹明6G酰肼,利用核磁和质谱对探针结构进行表征,并研究了其检测HOCl的荧光性能。实验结果表明,探针对HOCl的荧光分析具有高的灵敏性和选择性。利用不可逆的氧化还原反应,探针在中性溶液中快速产生与HOCl浓度呈线性比例的荧光增强信号,检测的线性范围为2~400μmol/L,检出限为0.06μmol/L,其他常见活性氧物种对检测影响小。探针能检测自来水中HOCl的含量,并在HeLa活细胞中实现了HOCl的荧光成像。 相似文献
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将烯丙基结构引入到罗丹明螺环中, 合成了荧光增强型钯离子探针RPd4. RPd4表现出对Pd2+的专一选择性和对其它阳离子良好的抗干扰能力. 探针荧光强度随着Pd2+的加入逐渐增强, 并且在微摩尔级呈现良好的线性关系, 通过拟合计算得到对Pd2+的检出限为0.51 μmol/L. RPd4具有较低的pKa值(3.81±0.02), 说明该探针可以在近中性pH范围内对Pd2+进行选择性识别. 该探针还可以提供比色及荧光两种方式对Pd2+进行可视化检测. 相似文献
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相比于基于非共价键的超分子相互作用的传统荧光探针,反应型荧光探针的识别过程不是通过配位和氢键的相互作用,而是通过与目标物发生化学反应,使得光谱性质或颜色改变,生成不同结构的光活性化合物。近年来,反应型荧光探针主要有三种化学反应类型:底物与受体通过共价键连接;底物作为催化剂,与受体发生不可逆的反应;基于置换反应使底物与受体络合。正是反应型荧光探针利用选择反应的优势识别特定物质,因而提供了方便、快捷、专一的分析检测目标物的方法,具有很高的灵敏度和选择性,受到越来越多的关注。本文综述了近六年来基于反应型罗丹明荧光探针用于检测金属阳离子、活性氧化物和阴离子诱导β-内酰胺开环的最新研究进展,评述其结构和检测性能之间的关系,并展望这类荧光探针的应用前景与发展趋势。 相似文献
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用罗丹明B与水合肼反应生成的中间体与溴丙炔反应合成了荧光增强型Pd2+检测用探针RPd5。 与Pd2+结合后,RPd5的吸收及荧光强度明显增强,其荧光强度增强约40倍,并使检测时间缩短至约16 min。 探针RPd5对Pd2+的响应灵敏,最低检出限为2.31×10-6 mol/L,可以在较宽pH值范围内特别是近中性pH值环境下有效检测Pd2+。 RPd5可以实现对Pd2+以比色及荧光2种途径的可视化识别,并可应用于土壤、池塘水等实际样品中痕量Pd2+的检测。 RPd5还可制成试纸用于纯净水中Pd2+检测。 相似文献
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Bi-Jie Bie Xiao-Rui Zhao Jia-Rui Yan Xi-Jun Ke Fan Liu Guo-Ping Yan 《Molecules (Basel, Switzerland)》2022,27(19)
Fluorescent imaging has been expanded, as a non-invasive diagnostic modality for cancers, in recent years. Fluorescent probes in the near-infrared window can provide high sensitivity, resolution, and signal-to-noise ratio, without the use of ionizing radiation. Some fluorescent compounds with low molecular weight, such as rhodamine B (RhB) and indocyanine green (ICG), have been used in fluorescent imaging to improve imaging contrast and sensitivity; however, since these probes are excreted from the body quickly, they possess significant restrictions for imaging. To find a potential solution to this, this work investigated the synthesis and properties of novel macromolecular fluorescent compounds. Herein, water-soluble dextran fluorescent compounds (SD-Dextran-RhB) were prepared by the attachment of RhB and sulfadiazine (SD) derivatives to dextran carrier. These fluorescent compounds were then characterized through IR, 1H NMR, 13C NMR, UV, GPC, and other methods. Assays of their cellular uptake and cell cytotoxicity and fluorescent imaging were also performed. Through this study, it was found that SD-Dextran-RhB is sensitive to acidic conditions and possesses low cell cytotoxicities compared to normal 293 cells and HepG2 and HeLa tumor cells. Moreover, SD-Dextran-RhB demonstrated good fluorescent imaging in HepG2 and HeLa cells. Therefore, SD-Dextran-RhB is suitable to be potentially applied as a probe in the fluorescent imaging of tumors. 相似文献
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Rhodamine hydrazides and hydroxamates derived from hydrazines and hydroxylamines have been applied as fluorescent chemosensors. Reaction‐based irreversible probes based on the specific chemical reactions of reactive target species have been developed and applied in bio‐imaging studies. The strong chelation frames provided by the rhodamine hydrazides and hydroxamates have been utilized for the monitoring of metal ions, amino acids, and reactive acid derivatives. This Personal Account focuses on our perspective of developing fluorescent probes based on rhodamine hydrazides and hydroxamates.
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锌广泛存在于人体内,具有重要生理功能。因此,对游离锌离子的选择性识别和有效检测具有重要意义。荧光探针因其设计简单、易于操作、灵敏度高、可细胞成像等诸多优点而广泛应用于锌离子的识别研究。锌离子荧光探针常见的识别机理包括光致电子转移、分子内电荷转移、荧光共振能量转移、聚集诱导荧光增强、螯合荧光增强等。其中,基于螯合荧光增强机理的锌离子探针,其荧光团通常可同时作为识别基团,因此,相比于其它探针,具有设计较为简单、合成较为便捷的优点。本文综述了近年来文献中报道的基于以上各种识别机理的锌离子荧光探针,并着重介绍了螯合荧光增强机理在锌离子识别中的应用。 相似文献