A molecularly imprinted electrochemical sensor based on cationic intercalated two-dimensional titanium carbide nanosheets for sensitive and selective detection of triclosan in food samples. (February 2022)

• Record Type: Journal Article
• Authors: Zhang, Meng; Yang, Yukun; Wang, Yuwei; Zhang, Bo; Wang, Haiyang; Fang, Guozhen; Wang, Shuo
• Is Part Of: Food control. Volume 132(2022)
• Publication Date: 2022-02
• Subjects: Electrochemical sensor -- MXene -- Ti3C2Tx -- Molecularly imprinted polymers -- Triclosan; Food -- Quality -- Periodicals; Food -- Analysis -- Periodicals; Food handling -- Periodicals; Food industry and trade -- Quality control -- Periodicals; Aliments -- Industrie et commerce -- Qualité -- Contrôle -- Périodiques; Aliments -- Qualité -- Périodiques; Aliments -- Analyse -- Périodiques; Hygiène alimentaire -- Périodiques; Food -- Analysis; Food handling; Food -- Quality; Periodicals; Electronic journals; 664.07
• DOI: 10.1016/j.foodcont.2021.108532
• Languages: English
• ISSNs: 0956-7135

Abstract

Abstract: An advanced molecularly imprinted electrochemical sensor (MIECS) based on two-dimensional materials MXene was developed for determination of triclosan (TCS) in food samples for the first time. Two-dimensional titanium carbide (Ti3 C2 Tx ) were introduced to improve electrochemical response of the MIECS. K + ions were spontaneously inserted into Ti3 C2 Tx nanosheets to form K + -Ti3 C2 Tx by soaking in alkali solution, thus improving the sensitivity of the sensor. Molecularly imprinted polymers (MIP) were prepared by electropolymerization of para aminobenzoic acid ( p -ABA), which can specifically recognize TCS. Under optimal conditions, the linear relationship between the current intensity and TCS concentration was obtained from 10 nmol L −1 to 50 μmol L −1 with a low detection limit of 1.18 nmol L −1 . The proposed MIECS showed good repeatability for detecting TCS at a concentration of 500 nmol L −1 solution by preparing five parallel modified electrodes, with a relative standard deviation (RSD) of 3.42%. At the spiked concentration levels of 0.05, 0.1, 0.5 mg L −1 /mg kg −1, the recoveries range of TCS in peach juice, onions and fish samples were 86.38%–95.52%. The proposed MIECS combining the advantages of Ti3 C2 Tx and MIP exhibited good sensitivity and selectivity, providing strategy of utilizing MXenes in the construction of electrochemical sensing platform and holding great promise in the field of food safety. Graphical abstract: Image 1 Highlights: A novel MIECS was constructed for the determination of trace TCS. K + ions were inserted between Ti3 C2 Tx layers to enhance the MIECS signal. MIP based on electropolymerized para aminobenzoic acid ensured specific TCS detection. The MIECS displayed high sensitivity, excellent selectivity and reproducibility. The MIECS was successfully applied for the detection of TCS in food samples.