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长波敏化发光铕配合物纳米粒子的制备与表征 总被引:2,自引:0,他引:2
以牛血清白蛋白(BSA)为保护剂, 利用沉淀法制备了平均粒径为35 nm的Eu(tta)3dpbt (dpbt = 2-(N,N-二乙基苯胺-4-基)-4,6-二(3,5-二甲基吡唑-1-基)-1,3,5-三嗪, tta = 噻吩甲酰三氟丙酮负离子)荧光纳米粒子. BSA保护Eu(tta)3dpbt纳米粒子在水中分散稳定性高, 光稳定性好, 长波敏化发光性能优良. 其在可见光区激发峰位于415 nm, 激发峰尾部延展至470 nm, 发光量子产率为0.20 (λex=415 nm, 25 ℃). 在近红外双光子激发下可发出纯正的红光, Eu(tta)3dpbt纳米粒子最大双光子激发作用截面为2.4×105 GM (λex=830 nm, 1 GM=10-50 cm4·s·photo-1·particle-1). 相似文献
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Ⅱ-Ⅵ型量子点制备及其在生物检测中应用研究进展 总被引:9,自引:0,他引:9
Ⅱ Ⅵ型量子点特殊而优良的可见光区荧光性质使得它们在生物识别及检测中具有潜在的应用前景 ,因而引起人们的广泛关注。本文概述了Ⅱ Ⅵ型量子点的制备及其在生物检测中应用的研究进展 相似文献
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Sebastiano Di Pietro Dalila Iacopini Barbara Storti Riccardo Nifosì Valeria Di Bussolo Mauro Pineschi Aldo Moscardini Giovanni Signore Ranieri Bizzarri 《Molecules (Basel, Switzerland)》2021,26(1)
The development of lanthanide-based luminescent probes with a long emission lifetime has the potential to revolutionize imaging-based diagnostic techniques. By a rational design strategy taking advantage of computational predictions, a novel, water-soluble Eu3+ complex from a cyclen-based ligand bearing 1,3-disubstituted benzo[h]isoquinoline arms was realized. The ligand has been obtained overcoming the lack of reactivity of position 3 of the isoquinoline moiety. Notably, steric hindrance of the heteroaromatic chromophore allowed selective and stoichiometry-controlled insertion of two or three antennas on the cyclen platform without any protection strategy. The complex bears a fourth heptanoic arm for easy conjugation to biomolecules. This new chromophore allowed the sensitization of the metal center either with one or two photons excitation. The suitability as a luminescent bioprobe was validated by imaging BMI1 oncomarker in lung carcinoma cells following an established immunofluorescence approach. The use of a conventional epifluorescence microscope equipped with a linear structured illumination module disclosed a simple and inexpensive way to image confocally Ln-bioprobes by single photon excitation in the 350–400 nm window, where ordinary confocal systems have no excitation sources. 相似文献
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In this paper, we present the optical properties and the platforms on fluorescent quantum dots for biological labeling, biomedical
engineering and biosensor in molecular imaging. Quantum dots possess several properties that make them very attractive for
fluorescent tagging: broad excitation spectrum, narrow emission spectrum, precise tunability of their emission peak, longer
fluorescence lifetime than organic fluorophores and negligible photobleaching. We describe how to take such advantages of
quantum dots to develop the technology and employ it to build assay platforms. Finally, ultrasensitivity, multicolor, and
multiplexing of the technology of semiconductor quantum dots open up promising and interesting possibilities for bioassay
platform. 相似文献
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在纳米金(Au nanoparticles,AuNPs)表面通过组装巯基DNA制得AuNPs-DNA生物探针后,末端脱氧核糖核酸转移酶(Terminal deoxynucleotidyl transferase,TdTase)催化探针DNA的3′-OH端,实现DNA的生长,并得到生长产物长单链DNA(Single-stranded DNA,ssDNA)。通过琼脂糖凝胶电泳和原子力显微镜成像(Atomic force microscope,AFM)对探针及ssDNA进行表征,结果表明TdTase能够实现纳米界面上DNA的高效生长,卷曲状态下链长可达850 nm。进一步将这种DNA的生长策略与适配体(Aptamer)技术相结合。首先在纳米金表面组装适配体片段1,在醛基化的磁珠颗粒表面组装适配体片段2,以此构建针对恩诺沙星的适配体生物传感器(Aptasensor)。该传感器对ENR在10~1.0×10~5 ng/mL具备良好的响应性能,检出限为1.0 ng/mL,能明显区分环丙沙星、氧氟沙星、诺氟沙星等对照组信号。研究表明,基于TdTase的适配体传感器操作便捷,具备良好的靶分子响应性能和特异性,可为食品安全检测等领域提供新的研究思路。 相似文献
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