In order to achieve rapid,selective identification and quantitative detection of rutin,in this paper,the fluorescent polydopamine organic nanoparticles(FPONs) emitting blue fluorescence were prepared for rutin fluorescence analysis by a simple,green and low-cost method using folic acid and dopamine as precursors. FPONs have excellent water solubility,resistance to photobleaching,salt resistance,relatively high fluorescence quantum yield and good fluorescence stability in a wide pH range. Interestingly,at
the excitation wavelength of 360 nm,the fluorescence intensity of FPONs was obviously quenched in the presence of rutin,based on this,a fast and sensitive method for rutin determination was established. The results show that the response time of rutin to FPONs as short as 5 sec,indicating the rapid detection of rutin. With the increase of rutin concentration,the relative fluorescence intensity
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showed a good linear relationship with the concentration of rutin with the linear range of 0-50 μmol/L,and the limit of detection(LOD) of 0.016 μmol/L. The mechanism of fluorescence quenching shows that the system may be caused by internal filtration effect and static quenching. Finally,the FPONs were successfully used to detect rutin in actual water samples,with the satisfied recoveries of 95.0%-100%,and the relative standard deviation≤4.1%,implying the feasibility and applicability of the method.
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