ABSTRACT Pluronic F127 has been widely used for controlled release of drugs. The aggregation behaviour and solubilisation properties of pluronics can be affected by addition of salts. This work reports the studies on the changes in micellar assemblies of F127 due to addition of inorganic anions (KCl, KBr, KI and KNO3) in Pluronic F127–Rhodamine B system. This was monitored by using UV–vis spectroscopy, fluorescence spectroscopy and fluorescence lifetime spectra. The change in fluorescence spectrum due to the presence of quenchers was attributed to the change in microenvironment of the micelle. The quenching depends on the ability of the fluorophore to transfer energy to the quencher. Out of all four salts, KI was observed to be the best quencher for the above system.

中文翻译：

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阴离子对罗丹明B-Pluronic F127复合物荧光猝灭的影响

摘要 Pluronic F127 已广泛用于药物的控释。添加盐会影响普朗尼克的聚集行为和增溶特性。这项工作报告了由于在 Pluronic F127-罗丹明 B 系统中添加无机阴离子（KCl、KBr、KI 和 KNO3）而导致 F127 胶束组装变化的研究。这通过使用紫外-可见光谱、荧光光谱和荧光寿命光谱来监测。由于猝灭剂的存在而导致的荧光光谱变化归因于胶束微环境的变化。猝灭取决于荧光团将能量传递给猝灭剂的能力。在所有四种盐中，观察到 KI 是上述系统的最佳猝灭剂。