基于銀納米粒子的蛋白質(zhì)與小分子熒光分析方法研究
[Abstract]:Aptamer is a single-stranded oligodeoxynucleotides screened by SELEX. Because of its various properties, such as high stability, easy synthesis and high specific binding to a variety of target molecules (small molecules, proteins and even whole cells), aptamers have received more and more attention. Because of its unique optical, electrical and catalytic properties, nanomaterials can interact with biomolecules, and then achieve the purpose of signal amplification and target recognition. The functional nanoparticles formed by the combination of the two have a wide range of application prospects in biological analysis and medical diagnosis. In this paper, we designed a simple and highly sensitive protein detection and analysis method based on the quenching effect of silver nanoparticles on fluorescence. Firstly, the aptamer modified with fluorescent molecules was self-assembled on the surface of silver nanoparticles, and the silver nanoparticles probe was synthesized. The adaptor fixed in 96 well plate and silver nanoparticles probe can be used as capture unit and detection probe, respectively, to complete the specific recognition of the added target protein PDGF-BB, and the three can form sandwich complex. At this time, due to the fluorescence resonance energy transfer effect of FRET (fluorescence resonance energy transfer, the fluorescence group is quenched by silver nanoparticles and the signal is in the "off" state. When the etch agent sodium thiosulfate is added, the silver nanoparticles are dissolved and the FRET effect is destroyed. the fluorescent molecules modified on the surface of the silver nanoparticles will be detached and released into the pore plate, and the signal "turn-on" will be released. The results showed that the concentration of the target protein PDGF-BB was proportional to the intensity of the detected fluorescence signal. This method can be used to detect the target protein with high sensitivity and specificity. This method has the following advantages: sandwich structure can greatly improve the specificity and sensitivity of detection, and the introduction of etch agent can change the signal from "off" to "on". This method can also be further extended to the analysis and detection of other proteins or small molecules through the reasonable design of aptamer molecules, and has a good application prospect in the field of analysis. The development of metal enhanced fluorescence (metal enhanced fluorescence, MEF) based on local surface plasmon resonance (LSPR (localized surface plasmon resonance,) with nano-metal structure broadens the application range of fluorescence analysis. Because of its unique surface plasmon resonance characteristics, silver nanoparticles can enhance many fluorescent molecular signals, so many applications have been developed by using the MEF effect of silver nanoparticles. In this paper, based on the MEF effect and FRET effect of silver nanoparticles, we establish a small molecular detection and analysis method. First of all, we self-assemble the fluorescent molecules to the surface of nano-silver, and then wrap a layer of silver shell in the outer layer of the fluorescent molecules to achieve the fluorescence enhancement effect of the fluorescent molecules. Then, the quenched molecular BHQ modified aptamers were connected to the silver shell to form a FRET sensor by nucleic acid hybridization. At this time, the fluorescence signal quenching of fluorescent molecules. When the target adenosine was added, the fluorescence signal of BHQ was recovered because of the specific binding of aptamer to adenosine. The experimental results show that there is a linear relationship between the recovery degree of fluorescence and the concentration of adenosine. This method makes full use of the characteristics of silver nanoparticles, has high sensitivity, strong specificity, simple operation and great potential.
【學(xué)位授予單位】:南京大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TB383.1;O614.122
【共引文獻(xiàn)】
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