Molecular Imprinted Polymer Based Electrode for Sensing Catechin (+C) in Green Tea

Chatterjee, Trisita Nandy; Das, Debangana; Roy, Runu Banerjee; Tudu, Bipan; Sabhapondit, Santanu; Tamuly, Pradip; Pramanik, Panchanan; Bandyopadhyay, Rajib

doi:10.1109/jsen.2018.2791661

Cited by 43 publications

(9 citation statements)

References 51 publications

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“…These studies confirm the oxidation values corresponding to EC, EGCG, and ECG in both GT and the commercial samples, which is also verified with the literature. 13 , 12 All these three CTs contribute as the major compounds in this group; so, their detection is very much important to estimating the quality of GT. This interaction arises owing to the electrostatic attraction of metal ions on the composite surface with the OH – groups of the detected CTs in GT.…”

Section: Results and Discussionmentioning

confidence: 99%

“… 10 Molecularly imprinted polymer (MIP) electrodes and non-imprinted polymer electrodes were developed and used for the effective sensing of CTs in tea samples. 12 Interestingly, using the electrochemical method, a non-enzymatic sensor using the MIP with Ni(OH) 2 nanopetals for the selective determination of EGCG was fabricated. The proposed sensor presented excellent results with commercially obtained EGCG with an LOD of 7 nM, which was finally verified with the GT samples.…”

Section: Introductionmentioning

confidence: 99%

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Novel Electrochemical Sensing of Catechins in Raw Green Tea Extract via a Trimetallic Zeolitic Imidazolate Fibrous Framework

et al. 2022

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Human health-related issues are increasing in day to day life because of the modern and unhygienic food lifestyles. In recent times, green tea (GT) gains more attention due to its numerous health benefits. It contains more biologically active compounds that improve mental health, increase metabolism, reduce cancer risks, and serve as an anti-aging agent for the brain. As it is globally consumed, the evaluation of the compounds present in it is very important. Hence, an attempt has been performed to evaluate these components in GT by using a cobalt nickel iron-based trimetallic zeolitic imidazolate framework as microfibers (CoNiFe-ZIF-MFs) synthesized via an electrospinning technique. Interestingly, the synthesized CoNiFe-ZIF-MFs catalyst simultaneously detects three major catechin (CT) groups, namely, epigallocatechin-3-gallate (EGCG), epicatechin (EC), and epicatechingallate (ECG). Further, the square wave voltammetry findings showed that there is a wide linear range of 50 ng to 1 mg for all the three CTs with LODs 45, 8, and 4 ng for EGCG, EC, and ECG, respectively. These results confirm the excellent sensing behavior of the composite toward GT extracts, proposing its practical utility in real-time compound analysis in food sectors. Other results like stability and reproducibility also promote its usage in the biomedical field. This study mainly focuses on the direct sensing of CTs present in GT without spiking any commercially purchased sample, and the sensing was performed simultaneously for all the three analytes; thus, this work gains novelty from the existing ones.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Electrochemical Sensing of Catechins in Raw Green Tea Extract via a Trimetallic Zeolitic Imidazolate Fibrous Framework

et al. 2022

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“…A good linear relationship (y = 0.11741, x = 0.52044, R 2 = 0.998) is found in the calibration curve between 10 and 140 μM (Figure 5B), and the limit of detection (LOD) is estimated to be 1.20 μM based on the signal-to-noise ratio (S/N) equal to 3. Compared to other EGCG detection methods relying on isocratic chromatography, 55 spectroscopic detection, 56 and electrochemical detection, 57 this AuNC based fluorescence turn on approach delivers a convenient and more straightforward detection with reasonable LOD and sensitivity.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Fluorescence Turn-On Antioxidant Recognition by Interface-Mediated Radical Termination ofl-Cysteine-Capped Gold Nanoclusters

Kar

Chang

Chen

et al. 2021

ACS Appl. Nano Mater.

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Selective antioxidant recognition plays a critical role in various scientific and clinical fields, however, development of straightforward detection mechanisms and reduction of technique operation are still barriers nowadays. For example, convenient detection of epigallocatechin gallate (EGCG), the most effective antioxidant among all tea catechins, is highly sought but is severely limited due to the lack of appropriate indicators. To overcome the aforementioned obstacles and to provide more adequate processes that can be employed in antioxidant detection, specific analyte targeting and efficient signal reporting are necessary for the platform design. In this work, a fluorescence "turn on" strategy based on gold nanocluster (AuNC) interface-mediated radical scavenging for selective antioxidant detection is reported. This approach utilizes Lcysteine capped AuNCs with great fluorescence stability as the reporter, where the presence of reactive oxygen species (ROS) generated from the Fenton reaction results in obvious fluorescence quenching. The introduction of antioxidants, that is, EGCG molecules, interestingly, neutralizes the ROS by initiating direct electron and hydrogen atom transfer to eliminate the unpaired free radicals. Besides, the phenolic OH groups and the gallate ring of EGCG also provide a selective and efficient complexation orientation toward Fenton reaction metal ions, where ROS generation is consequently prohibited. This dual-effect phenomenon recovers the originally ROS quenched AuNC fluorescence, which is dependent upon the introduced EGCG quantity. Relying on this fluorescence turn on strategy, the current platform delivers a low detection limit of 1.20 μM with excellent selectivity toward EGCG under the presence of other interfering species. Meanwhile, this approach also provides great accuracy on detecting total antioxidant capacity in commercial green tea samples. This antioxidant fluorometric turn on design therefore gives a more straightforward route on EGCG detection, and its specific recognition capability is very suitable for practical real sample analysis.

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“…In other cases, multivariate methods have been used to reveal correlations hidden in the data obtained when evaluating MIPs. Different combinations of PCA and PLSR methods have been applied for interpretation of MIP binding data obtained from SERS (surface-enhanced Raman spectroscopy) [ 635 , 636 , 637 , 638 , 639 , 640 , 641 , 642 , 643 , 644 ], for pattern recognition in the responses from various MIP-sensor arrays [ 645 , 646 , 647 , 648 , 649 , 650 , 651 , 652 , 653 , 654 , 655 , 656 , 657 , 658 , 659 , 660 ], to correlate the shape of MIP-quartz crystal microbalance frequency curves to different analytes [ 106 , 661 , 662 , 663 ], for cyclic voltammetry measurements on binary mixtures [ 214 , 656 , 664 , 665 ] and for correlating the results with HPLC data [ 665 ] and to process fluorescence data [ 666 ]. PLSR and PCA have also been used to correlate bupivacaine–MIP binding with rebinding solvent properties [ 667 , 668 ] and with polymer morphology and pre-polymerization interactions from MD simulations [ 403 ].…”

Section: Mip Structure and Functionmentioning

confidence: 99%

The Use of Computational Methods for the Development of Molecularly Imprinted Polymers

et al. 2021

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Recent years have witnessed a dramatic increase in the use of theoretical and computational approaches in the study and development of molecular imprinting systems. These tools are being used to either improve understanding of the mechanisms underlying the function of molecular imprinting systems or for the design of new systems. Here, we present an overview of the literature describing the application of theoretical and computational techniques to the different stages of the molecular imprinting process (pre-polymerization mixture, polymerization process and ligand–molecularly imprinted polymer rebinding), along with an analysis of trends within and the current status of this aspect of the molecular imprinting field.

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Molecular Imprinted Polymer Based Electrode for Sensing Catechin (+C) in Green Tea

Cited by 43 publications

References 51 publications

Novel Electrochemical Sensing of Catechins in Raw Green Tea Extract via a Trimetallic Zeolitic Imidazolate Fibrous Framework

Novel Electrochemical Sensing of Catechins in Raw Green Tea Extract via a Trimetallic Zeolitic Imidazolate Fibrous Framework

Fluorescence Turn-On Antioxidant Recognition by Interface-Mediated Radical Termination ofl-Cysteine-Capped Gold Nanoclusters

The Use of Computational Methods for the Development of Molecularly Imprinted Polymers

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