SDBS及NaOH誘導蛋白質在云母表面解吸附的原子力顯微鏡研究
[Abstract]:Protein is one of the most important components in organism, which is involved in almost all life activities and processes. Proteins can spontaneously adsorb on almost any material surface, a phenomenon that has long been known. The adsorption of proteins on the interface is a common phenomenon and the key to solve many problems in the field of interface science, biomaterials and bioengineering. It is of great theoretical and practical significance to study the problem of protein adsorption on the interface. At present, the study on the adsorption behavior of protein on the material is more mature, and the study on the desorption behavior of protein on the material is still in the primary stage. At present, the study of protein desorption on mica surface has not been reported. The purpose of this paper is to explore the method of protein desorption on mica surface. The adsorption and desorption of bovine serum albumin (BSA) (BSA) and lysozyme on mica surface were observed intuitively by atomic force microscope (AFM). The desorption was achieved by using sodium dodecylbenzene sulfonate (SDBS) and sodium hydroxide (NaOH) as desorption agents. The main work of this thesis is as follows: AFM study of 1.SDBS induced protein desorption from mica surface. Using SDBS as desorption agent, the desorption of protein from mica surface was realized by the interaction between SDBS and protein. The results of AFM characterization showed that, The adsorption of bovine serum albumin and lysozyme on mica surface increased with the increase of protein concentration. The desorption degree of protein increased with the increase of SDBS concentration, and increased with the increase of desorption time. Lysozyme was more easily adsorbed on the surface of mica than that of BSA in neutral environment. Lysozyme is less easily desorbed than BSA. AFM study of 2.NaOH induced protein desorption from mica surface. Protein is a amphoteric electrolyte composed of amino acids, which can be dissociated into negative or positively charged groups under certain solution pH conditions. By changing the pH of the solution, the protein with negative charge or negative charge is enhanced, so that the electrostatic repulsive force between mica and protein is greater than the gravity between them, and then the desorption of protein from mica is realized. The results of AFM characterization show that the electrostatic repulsive force between mica and protein is greater than that between mica and protein. BSA and lysozyme can be desorbed from mica by soaking the adsorbed sample into sodium hydroxide solution. The pH value of BSA desorbed was significantly different from its isoelectric point, but the pH value of lysozyme desorbed was basically consistent with its isoelectric point.
【學位授予單位】:河北大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:O647.3
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