研究目的
To develop a simple, efficient, and selective method for detecting melamine using a turn-on fluorescence probe based on nitrogen-doped carbon dots (N-CQDs) and Fe3+ ions.
研究成果
The N-CQDs-Fe3+ system serves as an effective turn-on fluorescence probe for melamine detection with high sensitivity, selectivity, and applicability in real samples like milk, offering a simple and cost-effective alternative to existing methods.
研究不足
The method may have limitations in complex matrices beyond milk; the detection limit of 0.67 μM might not be sufficient for very low concentrations; potential interference from other substances not fully explored; stability and reproducibility in long-term or field applications not extensively tested.
1：Experimental Design and Method Selection:
The study employs a turn-on fluorescence probe using N-CQDs and Fe3+ ions for melamine detection, based on fluorescence quenching and recovery mechanisms.
2：Sample Selection and Data Sources:
N-CQDs were synthesized via a one-step hydrothermal reaction; melamine and other substances were used as analytes; real milk samples were tested.
3：List of Experimental Equipment and Materials:
Includes transmission electron microscopy (TEM), UV-Vis spectrophotometer, fluorescence spectrometer, FT-IR spectrometer, XPS analyzer, and zeta potential analyzer.
4：Experimental Procedures and Operational Workflow:
N-CQDs were prepared hydrothermally; fluorescence quenching by Fe3+ and recovery by melamine were monitored; optimization of conditions (e.g., reaction time, solvent) was performed; interference studies and real sample analysis in milk were conducted.
5：Data Analysis Methods:
Fluorescence intensity measurements, linear regression for calibration curves, detection limit calculation (S/N=3), and statistical analysis (e.g., RSD for recovery).
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