Ultra-sensitive amperometric determination of quercetin by using a glassy carbon electrode modified with a nanocomposite prepared from aminated graphene quantum dots, thiolated β-cyclodextrin and gold nanoparticles
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Thiolated β-cyclodextrin functionalized gold nanoparticles (Au-β-CDs) with layered wrinkled flower structure were prepared. Au-β-CDs were electrostatically combined with protonated aminated graphene quantum dots (NH2-GQDs) to form a nanocomposite with better supramolecular recognition, conductivity, catalysis and dispersion properties. For constructing a quercetin (QU) sensor, the nanocomposites were one-step electrodeposited by a cyclic voltammetry (CV) method onto a glassy carbon electrode to form a stable film. Under optimized conditions, the sensor showed a wide linear response range of 1–210 nM, with a lower detection limit of 285 pM. At the same time, flavonoids with similar structures hardly interfere with the determination of QU. The sensor has been used to determine QU in honey, tea, honeysuckle and human serum with satisfactory results.
KeywordsElectrodeposition Differential pulse voltammetry Aminated graphene quantum dots Thiolated β-cyclodextrin AuNPs Quercetin Supramolecular recognition Electrochemical sensor
This research is supported by the National Natural Science Foundation of China (31701613, 21874114, 21475114).
- 27.Shadjou N, Hasanzadeh M, Talebi F, Marjani AP (2016) Integration of β-cyclodextrin into graphene quantum dot nano-structure and its application towards detection of vitamin C at physiological pH: a new electrochemical approach. Mater Sci Eng C Mater Biol Appl 67:666–674CrossRefPubMedCentralGoogle Scholar
- 36.Abdullah AA, Yardim Y, Senturk Z (2018) The performance of cathodically pretreated boron-doped diamond electrode in cationic surfactant media for enhancing the adsorptive stripping voltammetric determination of catechol-containing flavonoid quercetin in apple juice. Talanta 187:156–164CrossRefPubMedCentralGoogle Scholar