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用荧光法来监视多个生理参数时,需要几个不同的荧光探针分子.这些探针分子要被同一波长激发,但是具有明显分离的、不同的发射波长.目前,大多数荧光探针只有小的斯托克位移(50—90 nm),从而限制了它们在多个物质同时检测上的应用.在这项工作中,我们提出了一个新的分子探针设计:受体-荧光分子1-间隔-荧光分子2(简称RFSF探针).该RFSF探针具有更大的斯托克位移,在对多个物质同时检测时,它可以用来与传统的探针互补.在我们合成的这个分子中,荧光1是萘,荧光2是蒽,这个分子可以用来检测氢质子。在没有氢质子时,萘被280 nm光激发,由于能量转移,在420 nm处观察到了蒽的微弱发射光。此斯托克位移是140 nm,远大于传统的荧光探针分子,比如萘甲基胺的60 nm。当加入氢质子时,蒽在420 nm的荧光增加.此结果表明,一代新的RFSF荧光探针分子可以与传统的探针分子同时用来检测金属离子、代谢物、蛋白质,以及不同的生物标记,它们为荧光检测提供了更广泛的探针分子的选择. 相似文献
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介绍了基于量子点(QDs)的FRET原理,综述了基于QDs的FRET在生物传感器、蛋白质相互作用、生物分子构像变化和癌症治疗的光敏剂研究中的应用. 相似文献
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A DNA fluorescence probe system based on fluorescence resonance energy transfer (FRET) from CdTe quantum dot (QD) donors to Au nanoparticle (AuNP) acceptors is presented. CdTe QDs, 2.5nm in diameter, as energy donors, were prepared in water. Au nanoparticles, 16nm in diameter, as energy acceptors, were prepared from gold chloride by reduction. CdTe QDs were linked to 5'-NH2-DNA through 1-ethyl-3-(dimethylaminopropyl)car- bodiimide hydrochloride (EDC) as a linker, and the 3'-SH-DNA was self-assembled onto the surface of AuNPs. The hybridization of complementary double stranded DNA (dsDNA) bound to the QDs and AuNPs (CdTe-dsDNA-Au) determined the FRET distance of CdTe QDs and Au nanoparticles. Compared to the fluorescence of CdTe-DNA, the fluorescence of CdTe-DNA-Au conjugates decreased extremely, which indicated that the FRET occurred between CdTe QDs and Au nanoparticles. The fluorescence change of this conjugate depended on the ratio of Au-DNA to CdTe-DNA. When the AuNPs-DNA to QD-DNA ratio was 10:1, the FRET efficiency reached a maximum. The probe system would have a certain degree of fluorescence recovery when a complementary single stranded DNA was introduced into this system, which showed that the distance between CdTe QDs and Au nanoparticles was increased. 相似文献
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用于生物标记的半导体量子点研究 总被引:1,自引:0,他引:1
半导体量子点的独特光学性质使之成为理想的荧光探针材料,在生物医学领域具有广阔的应用前景.本文评述了目前量子点合成、表面修饰、结合生物分子的方法,以及半导体量子点在生物标记应用中相对于传统有机染料的优点. 相似文献