New Immunosensing-Fluorescence Detection of Tumor Marker Cytokeratin-19 Fragment (CYFRA 21-1) Via Carbon Quantum Dots/Zinc Oxide Nanocomposite

Table 3 Selectivity of the suggested immobilized CQDs/ZnO-BM 19.21 method towards the determination of CYFRA 21-1 antigen in human serum

Immobilized CQDs/ZnO-BM 19.21 fluorescence method
Interfering species, 10 ng mL⁻¹	%Er
Cysteine	2.9
Lysine	3.2
Serine	1.8
Tyrosine	3.8
Glycine	2.7
K⁺	1.5
Na⁺	1.2
Ca²⁺	1.9
Mg²⁺	2.1
Zn²⁺	2.3
CA 15-3	3.5
CA 27-29	3.6
CA 19-9	2.2
CA 125	3.9