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Fluorescence-infrared Absorption Dual-mode Nanoprobes Based On Carbon Dots@SiO2 Nanorods For Ultrasensitive And Reliable Detection Of Carcinoembryonic Antigen.

Kexin Wang, Yadan Ding, Weiqiang Yang, Xiaokun Wen, Huiying Zhao, Yanmei Liu, Xia Hong
Published 2021 · Medicine, Chemistry

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The level of carcinoembryonic antigen (CEA) in serum has the significant reference value for early diagnosis and treatment of various cancers. However, the CEA detection still suffers from the issue of limited sensitivity and reliability. Herein, a fluorescence (FL)-infrared absorption (IRA) dual-mode nanoprobe was fabricated based on carbon dots (CDs)@SiO2 nanorod for CEA detection. The FL and IRA signals display no mutual interference and can verify each other, ensuring the reliability of assay results. The highly sensitive FL signal originating from the CDs is enhanced by the surface passivation of SiO2 and improves the overall sensitivity of the detection. The detection range spans 9 orders of magnitude and the limit of detection reaches 794.6 ag mL-1, which are great superior to the commercial kits and most of the previous reports. Satisfactory recovery over the commercial kits was achieved in real serum samples. The ultrasensitive and reliable FL-IRA detection strategy sheds light on a new avenue toward promoting the practicability of the nanoprobes in clinical cancer diagnosis.
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