量子點(diǎn)和金簇納米傳感器制備及在藥物檢測中的應(yīng)用研究
[Abstract]:Nano-sensors are widely used in the fields of chemistry, food science, clinical diagnosis, environment and medicine because of their excellent optical properties and sensitivity. The selection of nano-materials is very important to the sensitivity, specificity and stability of the sensors. New nano-materials (quantum dots and Ginna) are used. Combining with sensors, nano-sensors with high specificity and sensitivity can be constructed for rapid detection of pesticide residues in environment, agricultural products and traditional Chinese medicines, and sensitive monitoring of clinical important drug molecules. It can not only promote the rapid development of nanotechnology in the history of human science and technology, but also open up new ideas for researchers. At present, there are many kinds of detection methods for pesticide paraquat, anticoagulant heparin, trypsin and folic acid, such as chromatography, electrochemical method and enzyme-linked immunosorbent assay, but these methods are easy to be interfered by other components of the actual sample, difficult to extract and analyze, or a variety of detection steps, detection time, etc. With the continuous improvement of human living standards and the deepening of scientific research, people gradually realize the importance of environmental safety, food safety and clinical drug safety to human health, so researchers urgently need to study. Preparation of nano-sensors with simple operation, rapid detection, low cost and good sensitivity for rapid detection of pesticide molecules, clinical important drug molecules and important protein molecules closely related to human health in order to meet the environmental, food safety assessment and clinical drug safety guidelines, thus for China's agricultural products and pharmaceutical industry The rapid and safe development and the trend of internationalization have laid a good foundation for clinical medicine and rapid diagnosis of some diseases, and also provide a reliable evaluation index for human health and quality of life index. Considering the environmental problems, pesticide residues in agricultural products and raw medicines, clinical drug requirements and testing, a series of fluorescent nano-sensors were designed and assembled for the rapid detection and analysis of pesticide residues in environment, agricultural products and medicinal plants. Paraquat, clinical anticoagulants heparin, folic acid, and trypsin provide new ideas for the establishment of pesticide residue detection and clinical drug monitoring platforms. The following major advances have been made in this paper: In the first chapter, we reviewed the preparation of quantum dots and metal nanoclusters, and their applications in environmental and agricultural pollutants, protein analysis, bioimaging and other research areas. In the second chapter, in order to achieve rapid detection and screening of paraquat in the environment, agricultural products and medicinal plant samples, we use Cd S quantum dots with good optical properties as fluorescent nanomaterials to establish a simple and sensitive sensor for the detection of paraquat. The water-soluble Cd S quantum dots can be synthesized rapidly in 15 minutes by optimizing the synthesis conditions with glutathione as template and protectant. According to the characteristics of paraquat as cationic salt, the fluorescence of GSH-Cd S quantum dots can be quenched efficiently by electron transfer, and the fluorescence intensity of environmental and agricultural samples can be changed according to the fluorescence intensity. This method can be used to detect paraquat in the range of 0.025-1.50 UG m L-1. Compared with the traditional method, it does not need expensive enzymes or antibodies and other reagents. The cost is lower and the detection limit is lower (0.01 UG m L-1). This method is suitable for environment, agricultural products and Chinese herbal medicines. In Chapter 3, a novel fluorescent "quenching-recovery" nanosensor was constructed to effectively avoid the influence of protein and ion in blood on the real-time monitoring and detection of anticoagulant heparin. In this chapter, bovine serum albumin (BSA) was used as both a template and a protectant to prepare water-soluble BSA-Cd S quantum dots. The quantum dots interacted with gold nanoparticles Au NPs, resulting in significant quenching of BSA-Cd S fluorescence. Protamine could induce agglomeration of gold nanoparticles (Au NPs), resulting in absorption of Au NPs. Because heparin and protamine bind preferentially through electrostatic interaction, protamine is far away from gold nanoparticles, and the fluorescence internal filtration is strengthened, which leads to the fluorescence signal change again, so as to detect the content of heparin, and on this basis, the quantitative detection of the real protamine is carried out. Compared with the traditional method, this method can effectively shield the interference of common proteins, amino acids and cations in blood and detect the content of anticoagulant heparin rapidly. This method has high sensitivity. The detection limit is 10-300 ng m L-1 and the minimum detection limit is 2.2 ng m L-1. In the fourth chapter, we constructed a fluorescent gold cluster (GSH-Au NCs) to detect the trypsin content in human urine samples and provide a basis for the diagnosis of pancreatic diseases. A simple, sensitive and unmarked fluorescent nanosensor was developed for the rapid detection of trypsin. In this chapter, the fluorescence of cytochrome C was effectively quenched by contact with gold nanoclusters due to the strong electron absorption of cytochrome C. When trypsin was present in the system, trypsin could catalyze the hydrolysis of cytochrome. C (Cyt C), resulting in fluorescence recovery. Therefore, the fluorescence intensity of the system changes to quickly test the activity of trypsin. This method has good selectivity and anti-interference ability, and fast and simple, detection linear range is 0.001-0.2 mg m L-1, the minimum detection limit is 0.3 UG m L-1, can be used for the actual urine samples of trypsin content. In the fifth chapter, we constructed a novel, selective and label-free gold nanoparticles (cyst-Au NPs) and gold nanoclusters (BSA-Au NCs) for the safe and effective detection of folic acid, an important substance affecting fetal development. Folic acid nanosensors. Based on the principle that gold nanoparticles quench the fluorescence of gold clusters by surface plasmon resonance energy transfer, folic acid can induce the agglomeration of gold nanoparticles and cause the red shift of their ultraviolet absorption peaks, resulting in the formation of gold nanoparticles (cyst-Au NPs) and gold nanoclusters (BSA-Au NCs). This scheme not only has good selectivity, but also has the function of absorbance and fluorescence dual-signal output. On the one hand, it can detect folic acid semi-quantitatively by changing the color of the solution. More importantly, it can detect folic acid semi-quantitatively by changing the color of the solution. The fluorescence method can accurately determine the content of folic acid in blood. The linear range of the method is 0.11-2.27 micromol L-1 and the minimum detection limit is 0.065 micromol L-1. In this paper, a series of important quantum dots or gold cluster nano-sensors for identifying different target drugs are designed and fabricated. The application of this kind of sensor will shorten the detection time, improve the detection sensitivity, reduce the detection cost and achieve the target in complex samples. The detection of the specificity of the substance has potential application value, which not only provides a feasible scheme and reliable basis for the rapid and sensitive detection of clinical drugs and proteins, but also provides a new idea and direction for the further and extensive study of the multiple functions of new nanomaterials.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2016
【分類號】:TP212.3;R927
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