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It has been increasingly important to develop a highly sensitive and selective technique that is easy to handle in detecting levels of beneficial or hazardous analytes in trace quantity. In this study, mono-6-deoxy-6-aminopropylamino- β -cyclodextrin (pr- β -CD)-functionalized silver-assembled silica nanoparticles (SiO 2 @Ag@pr- β -CD) for flavonoid detection were successfully prepared. The presence of pr- β -CD on the surface of SiO 2 @Ag enhanced the selectivity in capturing quercetin and myricetin among other similar materials (naringenin and apigenin). In addition, SiO 2 @Ag@pr- β -CD was able to detect quercetin corresponding to a limit of detection (LOD) as low as 0.55 ppm. The relationship between the Raman intensity of SiO 2 @Ag@pr- β -CD and the logarithm of the Que concentration obeyed linearity in the range 3.4-33.8 ppm (R 2 = 0.997). The results indicate that SiO 2 @Ag@pr- β -CD is a promising material for immediately analyzing samples that demand high sensitivity and selectivity of detection.

Mono-6-Deoxy-6-Aminopropylamino-β-Cyclodextrin on Ag-Embedded SiO2 Nanoparticle as a Selectively Capturing Ligand to Flavonoids