A Dual-Ion Synergistic Catalysis Utilizing Zn2+-Regulated CdSySe1–y ECL Immunosensor Employed for the Ultrasensitive CA19-9 Detection

Carbohydrate antigen 19-9 is a well-known malignancy biomarker, and its sensitive detection is particularly crucial in the diagnosis and assessment of pancreatic cancer. In this study, an ultrasensitive CA19-9 immunosensor was constructed using the Zn