1. Sandwich assay for β-lactoglobulin in infant food formula based on a hierarchically architectured antifouling capture probe and fluorescent recognition probe.
- Author
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Li, Huan, Jia, Donghui, Shuai, Jiangbing, Zhang, Xiaofeng, Wang, Shunyu, Wang, Min, Li, Ke, and Fu, Linglin
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FLUORESCENT probes , *INFANT formulas , *IRON oxides , *LACTOGLOBULINS , *BABY foods , *SPATIAL arrangement , *MAGNETIC particles - Abstract
• A sandwich assay for β-lactoglobulin (β-LG) in infant food formula was developed. • Hierarchical antifouling capture probe and fluorescent recognition probe were used. • Capture probe selectively recognized β-LG and resisted nonspecific protein adhesion. • Recognition probe exhibited fluorescent signal upon interaction with β-LG by aptamer. • Promising detection performance in commercial food samples was achieved. Tracing the presence of allergenic β-lactoglobulin (β-Lg) in infant foods is an urgent need, but the interference from the protein-rich matrix often hampered the detection accuracy. Here, we developed a sandwich assay for β-Lg in infant food formula based on a hierarchically architectured antifouling capture probe and fluorescent recognition probe. The antifouling capture probe was constructed from the polydopamine-coated magnetic particles (Fe 3 O 4 @PDA), which was modified with repeated glutamic acid-lysine (EK) antifouling peptide and aptamer towards β-Lg. The spatial arrangement of these ligands on the Fe 3 O 4 @PDA surface was carefully tailored. Furthermore, a fluorescent recognition probe based on aptamer-modified silica-doped carbon quantum dot was developed to explore a sandwich assay for β-Lg with the capture probe. The sandwich assay was proved to have high potential in detecting β-Lg in commercially available infant food samples. The work provided a new approach to developing detection methods with matrix interference-resistant properties. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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