Highly sensitive and selective optosensing of quercetin based on novel complexation with yttrium ions
A simple and fast method was developed for the determination of quercetin. The concentration of quercetin depends on the fluorescent emission resulting from the coordinative interaction between quercetin and the yttrium ion (Y3+). Notably, a portable platform to quantitatively analyze quercetin was constructed. The platform incorporates our custom-built homemade reader, based on a photodiode, and Arduino hardware, and accepts as its input paper ribbon on which Y3+ is deposited. In addition, the color changes of the paper ribbon were also identified by a smartphone via the hue values of the photographs. The limit of detection for detecting quercetin using spectroscopy, a smartphone, and the custom-built reader were calculated to be 27, 110, and 129 nM, respectively. The use of a custom-built device and smartphone for detecting quercetin via fluorescence from prepared paper ribbon reduces the time and cost of quercetin detection. This approach could be employed for the on-site sensing of quercetin in real samples.