Eutectogel-Based Antifouling Interface: Addressing Sensitivity and Accuracy Challenges in Complex Serum. (PubMed, Anal Chem)
After incubation in undiluted serum for 2 h, the impedance change rate of the modified electrode was reduced by ∼4.68-fold compared to a BSA-modified electrode, and the antifouling performance remained stable even after continuous incubation for 72 h. Using carbohydrate antigen 19-9 as a model biomarker, the constructed sensor achieved a wide linear detection range (10 μU·mL-1 to 100 U·mL-1) and an ultralow detection limit (0.4554 μU·mL-1), which is 2-3 orders of magnitude lower than previously reported values. The proposed eutectogel-based sensor enables ultrasensitive and reliable detection of trace tumor biomarkers in complex serum, offering broad prospects for early cancer diagnosis, prognosis monitoring, and clinical application.