Detection of catechins in tea beverages using a novel electrochemical sensor based on cyclodextrin nanosponges composite

Abstract

Catechin (Cat) is one of the primary functional components of tea, and its accurate detection is significant for understanding the health benefits of tea. In this study, cyclodextrin nanosponges (CDNS) were prepared and employed to combine with graphene quantum dots (GQDs) and carboxylated multi‐walled carbon nanotubes (MWCNTs‐COOH) to form a CDNS/GQDs/MWCNTs‐COOH composite. Scanning electron microscope and X‐ray diffraction were used to characterize the composite which was used to build a new electrochemical Cat sensor. The abundance of cavities, intermolecular gaps, and surface active groups of CD molecules endowed CDNS with remarkable Cat enrichment capacity. Due to the outstanding biocompatibility of GQDs, the good electrocatalytic activity of MWCNTs‐COOH, and the enrichment capacity of CDNS, the composite modified glass carbon electrode (GCE) exhibited excellent electrochemical sensing performance. The CDNS/GQDs/MWCNTs‐COOH/GCE showed a sensitive peak current response to catechins in the linear range between 2 × 10−8 and 1.2 × 10−6 M, with a minimum limit of detection (S/N = 3) of 4.45 nM. The sensor has also been successfully applied for catechin detection in tea beverages.

Electrochemical Behavior of β-Cyclodextrin-Ni-MOF-74/Reduced Graphene Oxide Sensors for the Ultrasensitive Detection of Rutin

“…Due to its advantages such as moderate cavity size, host–guest recognition, and low cost, it has been widely used in various fields [ 17 , 18 ]. It is worth mentioning that β-CD and its derivatives (β-CDs) are commonly used as molecular recognition and enrichment units in the field of electrochemical sensing [ 19 , 20 , 21 , 22 ]. For example, Zhao et al constructed a quercetin electrochemical sensor by using rGO-CD nanoparticles [ 23 ].…”

Determination of Sage Tea Polyphenols and Their Antioxidant Effects Using an Electrochemical DNA-Based Biosensor

“…They are simple, sensitive, easy, and low-cost methods. The electrochemical behavior of different electroactive compounds could be researched by cyclic, differential pulse and square-wave voltammetry [6][7][8][9][10][11][12][13][14][15][16]. Voltammetric techniques are advanced techniques that provide selective and sensitive analysis.…”

“…The antioxidant effects of polyphenols and their electrochemical behavior are connected, which means that the lower the anodic peak potential, the stronger the antioxidant effect [7,20]. Accordingly, electrochemical techniques can be suitable tools for the investigation of electrochemical properties and the determination of the antioxidant effects of herbal tea polyphenols [7,16,[21][22][23][24].…”