Abstract
Fluorescein-functionalized fluorescent polymer dots (F-PDs) were prepared by a facile one-pot method by magnetic stirring under mild conditions based on carboxymethylcellulose (CMC) and fluorescein as the precursors. The obtained F-PDs exhibited a nanoscale size of 3.2 ± 1.1 nm, excellent water solubility, and bright yellow fluorescence emission with a fluorescence quantum yield of 12.0%. The fluorescent probe displays rapid and sensitive chiral discrimination for lysine focused on different complexation abilities between lysine enantiomers and Cu2+. The concentration of L-lysine in the range 4 to 14 mM (R2 = 0.997) was measured by the fluorescence intensity ratio (I513/I429); the exitation wavelength was set to λex = 365 nm. The detection limit was 0.28 mM (3σ/slope). Importantly, this sensor accurately predicted the enantiomeric excess (ee) of lysine enantiomers at the designed concentration (lysine: 20 mM; Cu2+: 10 mM) ranges. The proposed sensor was successfully applied to determine L-lys (recovery: 95.8–101%; RSD: 0.465–3.34%) and ee values (recovery: 98.5–102%; RSD: 2.61–3.21%) in human urine samples using the standard addition method.
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The data that support the findings of this work are available from the corresponding author, [Guang Yang], upon reasonable request.
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Acknowledgements
This research was supported by Fundamental Research Funds for the Central Universities (2572021BU05), Natural Science Foundation of Heilongjiang Province (LH2020E007), the National Natural Science Foundation of China (NSFC, No. 51803021), and China Postdoctoral Science Foundation (2018M641790).
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Guang Yang: Project administration, Investigation, Funding acquisition, Writing-original draft. Zhongrui Wang: Investigation, Methodology, Writing-original draft. Xinxin Ji, Jingying Zhao, Jie Ji, and Guangyao Li: Investigation, Methodology, Validation. Hongyan Xia and Juan Hou: Investigation, Writing-review and editing, Supervision.
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Wang, Z., Ji, X., Zhao, J. et al. Preparation of fluorescein-modified polymer dots and their application in chiral discrimination of lysine enantiomers. Microchim Acta 190, 29 (2023). https://doi.org/10.1007/s00604-022-05608-8
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DOI: https://doi.org/10.1007/s00604-022-05608-8