Improved Performance of Lateral Flow Immunoassays for Alpha-fetoprotein and Vanillin by Using Silica Shell-stabilized Gold Nanoparticles
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Chemistry
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The sensitivity of lateral flow assays (LFA) was increased 30-fold by making use of spherical core-shell gold-silica nanoparticles (AuNP@SiO NPs). They can be prepared by silylation of surfactant stabilized AuNPs. The AuNP@SiO NPs are highly stable and can be used to label antibodies at virtually any concentration. The detection limit of an LFA for alpha-fetoprotein (AFP) can be decreased from 10 ng·mL to 300 pg·mL which makes it comparable to an enzyme-linked immunosorbent assay. To demonstrate the applicability to an immunoassay, a sandwich assay was developed for vanillin by covalent modification of the AuNP@SiO NPs with antibody. By using the method, vanillin can be detected visually in milk powder samples in concentrations as low as 100 ng·g. With unique optical property and great stability, this AuNP@SiO endows great potential in biosensing applications. Graphical abstract Controlled growth of AuNP@SiO. The newly prepared AuNP has a negative hydration layer. This layer is further surrounded by a bilayer of CTAB through electrostatic attraction. The hydrophobic inner layer enables the access and assembling of APTES and MTTS. After the hydrolysis of siloxane, a thin layer of silica shell is formed around AuNP.
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