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首页> 外文期刊>ACS applied materials & interfaces >Water-Soluble Nonconjugated Polymer Nanoparticles with Strong Fluorescence Emission for Selective and Sensitive Detection of Nitro-Explosive Picric Acid in Aqueous Medium
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Water-Soluble Nonconjugated Polymer Nanoparticles with Strong Fluorescence Emission for Selective and Sensitive Detection of Nitro-Explosive Picric Acid in Aqueous Medium

机译：具有强荧光发射性的水溶性非共轭聚合物纳米粒子，用于在水中介质中选择性和灵敏地检测硝基爆炸性苦味酸

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Water-soluble nonconjugated polymer nanoparticles (PNPs) with strong fluorescence emission were prepared from hyperbranched poly(ethylenimine) (PEI) and D-glucose via Schiff base reaction and self-assembly in aqueous phase. Preparation of the PEI-D-glucose (PEI-G) PNPs was facile (one-pot reaction) and environmentally friendly under mild conditions. Also, PEI-G PNPs showed a high fluorescence quantum yield in aqueous solution, and the fluorescence properties (such as concentration- and solvent-dependent fluorescence) and origin of intrinsic fluorescence were investigated and discussed. PEI-G PNPs were then used to develop a fluorescent probe for fast, selective, and sensitive detection of nitro-explosive picric acid (PA) in aqueous medium, because the fluorescence can be easily quenched by PA whereas other nitro-explosives and structurally similar compounds only caused negligible quenching. A wide linear range (0.05-70 mu M) and a low detection limit (26 nM) were obtained. The fluorescence quenching mechanism was carefully explored, and it was due to a combined effect of electron transfer, resonance energy transfer, and inner filter effect between PA and PEI-G PNPs, which resulted in good selectivity and sensitivity for PA. Finally, the developed sensor was successfully applied to detection of PA in environmental water samples.
机译：由超支化聚亚乙基亚胺（PEI）和D-葡萄糖通过席夫碱反应和在水相中自组装制备了具有强荧光发射性的水溶性非共轭聚合物纳米颗粒（PNP）。 PEI-D-葡萄糖（PEI-G）的制备PNP易于（一锅反应）且在温和条件下对环境无害。而且，PEI-G PNP在水溶液中显示出高的荧光量子产率，并且研究和讨论了荧光性质（例如浓度和溶剂依赖性荧光）和固有荧光的起源。 PEI-G PNP随后用于开发荧光探针，用于快速，选择性和灵敏地检测水性介质中的硝基爆炸性苦味酸（PA），因为荧光可以很容易地被PA淬灭，而其他硝基爆炸性和结构相似的化合物仅引起微不足道的淬灭。获得了宽线性范围（0.05-70μM）和低检测限（26 nM）。仔细研究了荧光猝灭机理，这是由于电子传递，共振能量传递以及PA和PEI-G PNP之间的内部过滤作用的综合作用，从而导致了对PA的良好选择性和灵敏度。最终，开发的传感器成功应用于环境水样品中PA的检测。

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