電子順磁共振在生物,化學(xué)中的應(yīng)用(從系綜到單分子)
[Abstract]:Electron paramagnetic resonance (EPR) (ESR), is a powerful spectroscopic method for studying the electronic structure and kinetic information of unpaired matter. At present, ESR technology has been widely used in the field of biochemistry, such as the analysis of the conformation and function of monolayer magnets containing transition metal ions, the structure and catalytic mechanism of metalloproteinases, and the electron transport processes related to free radicals. Structure and kinetics of stable free radicals. Conventional paramagnetic resonance usually requires 109 electron spin ensemble samples to detect signals due to the limitation of detection methods. In recent years, with the improvement of technology and the exploration of microcosm, people are moving towards direct observation at single molecule level. Along with it, the magnetic resonance field is also developing to the micro magnetic resonance. At present, the micro spin magnetic resonance technology based on NV is becoming more and more mature, and even reaches the level of single molecule single spin detection. We are exploring its application in biological systems through this new magnetic resonance technology. Our goal is to study the ensemble magnetic resonance effect of biological systems, and at the same time, we can extract the spin signal one by magnetic detection based on NV, and analyze its structure and dynamics information. And not forget its individual characteristics. We have carried out related scientific research work around this goal. This paper mainly introduces three related works that we have accomplished: 1. On the ensemble platform, we explored the mechanism of laccase catalyzed catechol reaction. We found that laccase can lead to the ring opening of phenols, and this process is a free radical reaction process. By means of paramagnetic resonance spectroscopy, we speculate a possible reaction pathway. Through the study of mechanism, we infer that laccase may lead to gossypol detoxification, and it is proved that laccase does have detoxification effect. This may provide a great help to expand the application of cotton. 2. The reaction mechanism of phenylacetylene and its derivatives with diethyl phosphite was studied on the ensemble platform. It was found that p-carbonyl phosphate could be synthesized from phenylacetylene and diethyl phosphite in copper-iron bimetallic system. The free radical reaction pathway was confirmed by ESR spin trapping technique. This is a highly efficient and environmentally friendly chemical reaction, the products in the chemical synthesis field, biological field have application prospects. 3. We have completed the ensemble detection of nitrogen-oxygen free radical labeled proteins, and we have obtained the first electron paramagnetic spectra of a single molecule at room temperature using magnetic resonance technique based on NV. The characteristics of the ESR signal of its single molecule are analyzed in depth. This is an important landmark experiment of electron paramagnetic resonance from ensemble level to monolayer level. And it has been applied to biological system, and some structural and kinetic information have been analyzed.
【學(xué)位授予單位】:中國(guó)科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:O482.533
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