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Colloidal gold and Eu3+‐doped fluorescent microspheres were applied as labels to develop the immunochromatographic strips for detecting melamine in milk. Under the optimized condition, the visual detection limit of colloidal gold‐immunochromatographic test strip (ICTS) was 150 μg/L of melamine in phosphate‐buffered saline (PBS), although the visual detection limit of fluorescent nanoparticles (FN)‐ICTS...
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