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Quantum dot beads are uniform microspheres functionalized with carboxyl groups containing thousands of quantum dots with no quantum dot leakage and no photobleaching. The fluorescence signal can be amplified more than 4000 times which is conducive to improving the sensitivity of immunoassay detections and accessible to simple and efficient bioconjugation strategies. FWHM < 40 nm. https://www.cd-bioparticles.com/product/diagnano-carboxyl-quantum-dot-beads-0-2-m-520-nm-emission-item-dnq-x071-1555.html