Abstract
Polyion complexes have been known about for decades, with their applications mainly restricted to drug and gene delivery. In this study, we show that by the introduction of fluorescent charged molecules into a polyion complex, it can be used as a specific detection system for surfactants. The fluorescence of 8-hydroxy-1,3,6-pyrenetrisulfonic acid trisodium salt (HPTS) is quenched in the ionic complex, while it can be recovered with the addition of the surfactant sodium dodecylbenzenesulfonate (SDBS), due to the stronger interaction between SDBS and the polyelectrolyte. This leads to a drastic color change of the solution, and a recovery of the strong emission of HPTS. Specifically, the fluorescence is linearly proportional to the concentration of SDBS, thus it can be used for the qualitative detection of SDBS. Furthermore, the detection limit for SDBS can be up to the order of 10−10 M. We believe that competitive dissociation of the ionic complex can be used as a general approach for the construction of new functional materials.
Highlights
IntroductionPolyion complexes have attracted significant attention because of their facile formation [1,2,3,4]
Polyion complexes have attracted significant attention because of their facile formation [1,2,3,4]and great potential in biomedical applications [5,6], especially in drug delivery and gene transfection [7,8,9,10]
We report that using the principle of competitive ionic interaction in a fluorescent polyion complex formed with a polymer containing the aromatic ring of pyridium, the facile visual specific detection of the surfactant sodium dodecylbenzenesulfonate (SDBS) is possible
Summary
Polyion complexes have attracted significant attention because of their facile formation [1,2,3,4]. We report that using the principle of competitive ionic interaction in a fluorescent polyion complex formed with a polymer containing the aromatic ring of pyridium, the facile visual specific detection of the surfactant sodium dodecylbenzenesulfonate (SDBS) is possible. The chemistry behind this is that the benzene ring in SDBS may undergo aromatic interaction (π-π stacking) with the pyridium group, among other aliphatic surfactants. We assume that the fluorescence of HPTS can be recovered by the introduction of SDBS, as opposed to other aliphatic surfactants, as SDBS offers additional aromatic interactions with the pyridinium group of the PMVP41 -b-PEO205 when compared to other aliphatic surfactants. Of the ionic self-assembled polyion complex in the presence of dodecylbenzenesulfonate sodium dodecylbenzenesulfonate
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