An Enhanced Photosensitive Sensor Based on ITO/MWCNTs@Polymer Composite@BiVO<sub>4</sub> for Quercetin Detection
Irem Sarikaya, Mahmut Ozacar, Esra Kaleoglu, Soner Cakar, Cengiz Soykan
article (Uluslararası, Hakemli) | Yazar(lar): Irem Sarikaya, Mahmut Ozacar, Esra Kaleoglu, Soner Cakar, Cengiz Soykan | Yıl: 2023 | Dergi/Kurum: BIOSENSORS-BASEL | İndeks: WOS.SCI | DOI: 10.3390/bios13070729 | Anahtar Kelimeler: quercetin, hydrothermal synthesis, photosensitive sensors, polymer composite sensors — Özet
The fact that antioxidants scavenge free radicals in the human body and naturally treat many health problems that will occur in this way has increased the consumption of antioxidant-containing foods. However, consumption of artificially prepared antioxidants could cause cancer. Therefore, antioxidants from natural sources are preferred. Quercetin is an antioxidant present in natural samples. In this article, multi-walled carbon nanotubes (MWCNTs), a polymer composite (PC) consisting of a mixture of 15% (by mass) polystyrene (PST), 15% (by mass) polyacrylonitrile (PAN) and 70% (by mass) polyindole (PIN), and semiconducting BiVO4 were used to prepare electrodes, and then a photosensitive ITO/MWCNTs@PC@BiVO4-based sensor was fabricated for quercetin detection. Quercetin was analyzed via the photosensitive ITO/MWCNTs@PC@BiVO4 sensor in 0.1 M phosphate buffered saline (pH 7.4) solutions including various quercetin concentrations. The constructed quercetin sensor displayed a wide linear response between 10 and 200 & mu;M and a limit of detection of 0.133 & mu;M. The developed photosensitive ITO/MWCNTs@PC@BiVO4 demonstrated a high sensitivity (442 & mu;A mM(-1) cm(-2)), good reproducibility (relative standard deviation 3.6%), high selectivity and long-term stability (>49 days) towards quercetin sensing. The photoelectrochemical sensor was then applied to detection of quercetin in black tea as a real-life sample. Our study could lead to the development of novel photosensitive PC polyphenol sensors.