烷基苯磺酸釓—聚酰胺—胺樹狀大分子親水膠束聚集體的構建及釓離子釋放的調(diào)控
[Abstract]:Synthesis of water-insoluble gadolinium dodecyl benzene sulfonate gadolinium chloride (GdCl3 6H2O) and straight chain sodium dodecylbenzene sulfonate (Gd).) The solubilized fatty alcohol polyoxyethylene ether (AEO-25) was dispersed in water to form a mixed sol beam. When the mass ratio of AEO-25 to Gd is greater than 1.5, the solution is transparent and stable, and the white snowflake solid is obtained after freeze-drying. The solubilized mixed micelles were mixed with the fourth generation polyamide-amine dendrimer (4G-PAMAM) solution. Supramolecular aggregates (4G-PAMAM/AEO-25/LASGd) with ordered and advanced structures are self-assembled by weak intermolecular interactions and their synergistic effects. The structure and properties of dodecyl benzenesulfonate gadolinium sulfonate mixed micelles and their solubilized aggregates were characterized by elemental analysis thermogravimetry IR NMR transmission electron microscopy and inductively coupled plasma atomic emission spectrometry. The results show that the mixed micelles are solubilized by nonpolar molecules in the core. The aggregate is in the core of the micelle as gadolinium alkyl benzenesulfonate and the dendrimer is surrounded by the mixed micelle in the form of aqueous solution. The product of freeze-drying was dissolved in water, then dialyzed by adding acid or alkali to adjust different pH value, the content of gadolinium in dialysate was measured after the same time, it was found that the content of gadolinium decreased gradually. It shows that the change of pH can control the release of gadolinium ion in aggregates. Similarly, it was also found that the controlled release of gadolinium ion could be achieved by changing the mass ratio of 4G-PAMAM and solubilized micelles and the temperature of the aqueous solution system of aggregates. In this paper, a water-soluble aggregate was prepared, and the release behavior of gadolinium ion was regulated by changing the pH value of the solution, the ratio of the mixture and the temperature of the system. The aggregates are expected to be used as pH sensitive (MRI) contrast agents.
【學位授予單位】:溫州大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TQ421;O641.3
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