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荧光/化学发光探针成像检测超氧阴离子自由基的研究进展 总被引:1,自引:0,他引:1
超氧阴离子自由基(O·-2)是细胞内氧气单电子还原后最先产生的一类含氧的高活性物种(活性氧,ROS),与生命过程息息相关.正常稳态浓度的O·-2起重要的信号调控作用,包括细胞的增殖、分化、自噬等.但O·-2浓度的异常,又与癌症、神经退行性疾病、糖尿病等多种疾病的发生发展密切相关.因此,监测O·-2浓度的变化对揭示相关疾病的机理具有至关重要作用.由于荧光成像检测方法具有诸多优势,发展高灵敏、高选择性检测O·-2的荧光探针成为揭示相关疾病发生发展分子机制的关键切入点.近年来,随着荧光显微技术的发展,研究者开发了多种荧光/化学发光探针,实现了对细胞及活体内O·-2水平的可视化监测.本文综述了近五年用于检测O·-2的分子探针、纳米探针、蛋白探针以及化学发光探针的研究进展,并对其发展前景进行了展望. 相似文献
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总结了近两年来检测生物硫醇、H2S以及SO2衍生物荧光探针的研究现状,着重讨论了探针设计的传感机制、传感性能和生物应用方面的特征.检测生物硫醇方面,主要介绍了涉及多反应位点的多通道探针用于区分谷胱甘肽(GSH)、半胱氨酸(Cys)和同型半胱氨酸(Hcy);检测H2S方面,重点介绍了基于叠氮基还原和亲核反应这两种机制设计... 相似文献
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含有顺磁性金属钆离子及钆团簇的内嵌金属富勒烯(如Gd@C82,Gd@C60和Gd3 N@C80)及其衍生物是一类高效的MRI分子影像探针,其造影效率远优于传统钆基螯合物造影剂.重要的是,碳笼的高度稳定性保护了内嵌团簇,使之免受体内代谢物质的进攻和防止了外泄,从而大大提高了其生物安全性.同时,碳笼还是其它生物活性物质或分子影像探针的有效载体,易赋予其多功能性,从而提高疾病检测的灵敏度和准确性.本文介绍了多种钆内嵌金属富勒烯分子影像探针的研究进展,讨论了内嵌金属团簇和笼外化学修饰对其弛豫性能的影响,以及不同的功能基团对其生物相容性和动物体内分布的影响,并展望了其兼具多功能分子影像探针载体的应用前景. 相似文献
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Water soluble tetraphenylethene-based(TPE) aggregation-induced emission fluorescent organic nanoparticles(FONs) were facilely prepared via Schiff base condensation with polyethylenimine(PEI) and subsequent reduction. The obtained TPE-PEI FONs were characterized by a series of techniques including 1H-NMR, 13C-NMR, gel permeation chromatography, UV absorption spectra, fluorescence spectra, Fourier transform infrared spectroscopy, size distribution and zeta potential measurement, and transmission electron microscopy. Biocompatibility evaluation and cell imaging of TPE-PEI FONs were further explored. We demonstrated that such FONs showed intense fluorescence, spherical morphology and excellent biocompatibility, making them very suitable for cell imaging application. 相似文献
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利用与氨基选择性反应的荧光染料5-羧基荧光素琥珀酰亚胺酯(5-FAMSE)对豇豆花叶病毒(CPMV)表面的氨基进行修饰,制备了荧光功能化CPMV纳米粒(5-FAM/CPMV)。对其结构形态和单、双光子荧光进行了测试,用毛细管电泳对其表面特性进行了考察,并将其用于Hela细胞的双光子荧光成像。研究表明,目标纳米粒粒径均匀,仍具有天然CPMV的特性,能进入Hela细胞,在波长800nm激光激发下可以成功地用于肿瘤细胞的成像分析,可望用于肿瘤靶向双光子荧光细胞成像方面的研究。 相似文献
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M. I. Sández A. Suárez M. A. Rios M. C. Balo F. Fernández Carmen López 《Photochemistry and photobiology》1996,64(3):486-491
Abstract— Various newly synthesized substances containing the same chromophore as PRODAN were subjected to a spectroscopic study. The new substances, ω-[6-( N -meth-yl- N -alkylamino)naphthoyl]alcanoic acids (MANA), possess polar groups and alkyl chains of variable length that make them potentially useful as fluorescent probes in membrane studies. This paper reports on their spectroscopic properties in various pure solvents. Their Stokes shifts are given and related to different physicochemical properties of the solvents. A theoretical study of the behavior of the new substances is also presented. 相似文献
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Dr. Graeme J. Stasiuk Dr. Florencia Minuzzi Dr. Myra Sae‐Heng Charlotte Rivas Dr. Hans‐Paul Juretschke Dr. Lorenzo Piemonti Dr. Peter R. Allegrini Dr. Didier Laurent Andrew R. Duckworth Prof. Andrew Beeby Prof. Guy A. Rutter Prof. Nicholas J. Long 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(13):5023-5033
Despite the contribution of changes in pancreatic β‐cell mass to the development of all forms of diabetes mellitus, few robust approaches currently exist to monitor these changes prospectively in vivo. Although magnetic‐resonance imaging (MRI) provides a potentially useful technique, targeting MRI‐active probes to the β cell has proved challenging. Zinc ions are highly concentrated in the secretory granule, but they are relatively less abundant in the exocrine pancreas and in other tissues. We have therefore developed functional dual‐modal probes based on transition‐metal chelates capable of binding zinc. The first of these, Gd ?1 , binds ZnII directly by means of an amidoquinoline moiety (AQA), thus causing a large ratiometric Stokes shift in the fluorescence from λem=410 to 500 nm with an increase in relaxivity from r1=4.2 up to 4.9 mM ?1 s?1. The probe is efficiently accumulated into secretory granules in β‐cell‐derived lines and isolated islets, but more poorly by non‐endocrine cells, and leads to a reduction in T1 in human islets. In vivo murine studies of Gd ?1 have shown accumulation of the probe in the pancreas with increased signal intensity over 140 minutes. 相似文献
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