Scheme 1.
Schematic illustration for detection of pancreatic cancer cells. The preparation process of the Fe3O4@DOP NPs and the attachment of H1-FAM and H2-FAM onto the Fe3O4@DOP NPs (A). Diagram illustration for sensitive detection of pancreatic cancer cells based on Fe3O4@DOP NPs and HCR amplification (B). The application of the strategy in cell counting and imaging (C)