鉸接十四元瓜環(huán)對生物小分子的識別性能研究
[Abstract]:As a main body compound in the supramolecular host and guest chemistry, the melon ring is a class of large caged compounds linked by the methylene bridge through the methylene bridge. It has a hydrophobic cavity and a hydrophilic port. It can selectively combine a variety of organic, inorganic and biological molecules to form host guest inclusion complexes or self groups in the solution. The articulated fourteen element melon ring (tQ[14]) is made up of 2 Ya Jiaji bridging rings which are rotated by fourteen anoside cells through 26 Ya Jiaji bridging and 180 degrees. The structure is similar to the shape of the Arabia digital "8". Compared with the common melon ring (Q[5-8,10]), the solubility of tQ[14] is unique and it can be dissolved in both Water can also be dissolved in two methyl sulfoxide, and it can be seen from its structure that tQ[14] has a central cavity and two border cavities. TQ[14] has a special structure that has not been reported in all the cucurbit rings reported at present. This paper, based on tQ[14], selects small molecules such as amino acids, biological dyes and other biological molecules, based on the recognition of host and guest. The identification mechanism and action law of tQ[14] on the above biological small molecules were studied. On this basis, the tQ[14]/ bio dye supramolecular fluorescence probe was constructed and its analysis and detection performance on metal ions and pesticides were studied. The main research contents and results are as follows: the main research contents and results are as follows: The supramolecular recognition of 20 kinds of L- amino acids by tQ[14] was investigated. The modes of action, structural characteristics and related thermodynamic parameters of the host and guest complexes were discussed. The results showed that in the 20 kinds of L- amino acids, tQ[14] had a special recognition effect on two basic amino acids (Lys, Arg), and Lys and Arg either entered the center of tQ[14] directly. The cavity, or a special host and guest complex formed at the two edge cavity of the tQ[14], may be caused by the ionic dipole effect of the carbonyl port of the melon ring and the amino acid ion dipole and the hydrophobicity of the amino acid side chain and the cavity of the melon ring. For Phe, Tyr, Trp, His, Met, Cys, the side chain group on the amino acid enters tQ. The interaction of [14]'s central cavity mainly comes from the hydrophobicity of the amino acid side chain and the cavity of the melon ring. For the remaining 12 kinds of amino acids, one is Pro, Val, Ala, Leu, Ile, Gly, and the other group is the central cavity of the side chain. The effect is weak, but tQ[14] has little effect on Asn, Asp, Glu, Gln, Thr, Ser, so the mode of action of tQ[14] and the main object of 20 L- amino acids shows a great difference because of the different side chain groups, and presents a special recognition performance. The supramolecular interaction between tQ[14] and the cyanine dye thiazole orange (Thiazole orange) is studied. The specific flexible structure of tQ[14] and the carbonyl oxygen of the high density of the melon ring port have a more complex mode of action in the action of TO; (1) the thiazole ring part of TO can enter the cavity of the tQ[14]; (2) the TO two polymer can be located at the port of tQ[14]; (3) as the concentration of the melon ring increases, there is also the outer wall of the melon ring and the aromatic ring of TO. The wall action, so t Q[14] and TO formed a novel structure of supramolecular assembly, and tQ[14] can greatly enhance the fluorescence intensity of TO. According to the phenomenon that tQ[14] can enhance the TO fluorescence enhancement, a different proportion of tQ[14]/TO supramolecular fluorescence probes have been constructed. The study found that the tQ[14]/TO superfraction of different proportions in different medium conditions. The fluorescent probes have different responses to metal ions, such as Hg~ (2+) enhancing the fluorescence intensity of t Q[14]/TO (2:1) in aqueous solution; Ba~ (2+) quenches the fluorescence of tQ[14]/TO (2:1, pH=2) in the aqueous solution of HCl. The analysis of the analysis and detection performance of the above heavy metal ions shows that the concentration of metal ions has a good linear relationship with the fluorescence intensity of the probe in a certain concentration range, and the detection limit of metal ions can be about 10-6~10-7mol/L. The result provides a theoretical basis for the detection of metal ion residues. Finally, the study of tQ[14 The supramolecular interaction between 2-[4- (two methylamino) styrene based]-1- methyl pyridine iodine (DSMI), anti -4-[4- (two methylamino)]-1- methylpyridine iodide (t-DSMI) and common herbicide paraquat. The results show that the fluorescence intensity of DSMI and t-DSMI can be sensitized by tQ[14] in the buffer solution of pH=6. The 1: 1 host and guest complex is formed. When the acidity of the regulating system makes it pH=2, the fluorescence of the system quenches, and the mode of action of the host and the object varies greatly under different acidity, that is, the effect of the port action to the cavity is changed, and the fluorescence intensity of the dye is sensitized by the buffer solution of the pH=6 in the buffer solution. One phenomenon has constructed the melon ring / dye supramolecular fluorescence probe and tested the pesticides. The results show that the detection of paraquat has good selectivity, and the linear relationship is good, the detection limit is about 10-8mol/L.
【學位授予單位】:貴州大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:O641.3;TQ450.1
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