Gold nanourchins (GNUs) have a multitude of tips-and-dips which make them excellent SERS substrates. Herein, GNUs were obtained via a two-step synthesis integrated in a controllable microfluidic setup. GNUs were bio-functionalized with a reporter molecule and a polymeric coating. The detection system relies on antibodies that recognise the cancer biomarker CEA-CAM5. Antibody-antigen binding leads to a proportional aggregation of the particles and SERS enhancement. Integration of the detection system in a microfluidic platform offers a multitude of advantages. Acknowledgement: This work was supported by MCID, CNCS-UEFISCDI through proj.nr.PN-III-P1-1.1-TE-2021-0234 within PNCDI-III, and through the Core Programme proj.nr.PN.23.24.01.02 within PNCDI 2022-2027.
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