Detection of theaflavins in black tea using a molecular imprinted polyacrylamide-graphite nanocomposite electrode

Chatterjee, Trisita Nandy; Roy, Runu Banerjee; Tudu, Bipan; Pramanik, Panchanan; Deka, Himangshu; Tamuly, Pradip; Bandyopadhyay, Rajib

doi:10.1016/j.snb.2017.02.139

Cited by 42 publications

(6 citation statements)

References 47 publications

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“…Since the anodic peak seen in CV is correlated to the presence of phenolic compounds, the electrochemical process concerning their redox dynamics may be associated to reversibility. Such reversible system relies on phenol/quinone shift, however they can only be henceforth attributed when anodic/cathodic processes occur at similar potentials [16][17][18]. Thus, SWV was employed hence its propriety to display both anodic and cathodic currents, which allows clear redox pairs visualization.…”

Section: Swv and Dpv Resultsmentioning

confidence: 99%

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2018

RJLBPCS

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Carqueja (Baccharis trimera) (Ba) is an Asteraceae member widely known in Brazil due to its therapeutic applications in folk medicine. Such applications rely on antioxidant activity, which can be assessed through different methods. Although the most used tools for antioxidant activity evaluation rely on colorimetry as analytical principle, they are not reliable for complex vegetal samples assessment. Therefore, non-colorimetric methods for antioxidant analysis such as voltammetry are noteworthy due to their enhanced selectivity when vegetal samples are concerned. Thus, the aim of this work is to provide a wide electrochemical study concerning Ba antioxidant quality. Different voltammetric assays were used, namely: Ciclic Voltammetry, Square Wave Voltammetry and Differential Pulse Voltammetry. Findings indicated remarkable antioxidant activity quality, as well as one reversible redox system. The electrochemical processes implicate in electropolymerization which is further corroborated by sample adsorption dynamics. The small potentials to which anodic peak amplitude was recorded imply high antioxidant quality, which justify Ba use in therapeutics.

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Section: Swv and Dpv Resultsmentioning

confidence: 99%

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2018

RJLBPCS

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“…The choice of the tea brewing time by respondents was caused by the different effects of the teas. Only one-third of respondents always pay attention to the method of brewing which affects the color, taste, and aroma of tea, as well as its strength, which is also related to the content of caffeine and L-theanine and depends on the type of tea [ 7 , 84 , 85 , 86 , 87 ].…”

Section: Discussionmentioning

confidence: 99%

“…Most of the research in the scientific literature has focused on the potential health benefits of tea and its ingredients such as polyphenols, and catechins, especially for low-processed teas such as, white, green, and red tea [ 4 , 5 , 6 , 7 , 8 , 9 ]. Due to its numerous health properties, i.e., antioxidant, thermogenic, anti-inflammatory, cholesterol-lowering, antimicrobial, neuroprotective, antihypertensive, and anti-carcinogenic, the presence of tea in the human daily diet is significantly high [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Consumer Choices and Habits Related to Tea Consumption by Poles

Czarniecka-Skubina

Korzeniowska-Ginter

Pielak

et al. 2022

Foods

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Tea is one of the most consumed beverages in the world. In the literature, much attention is paid to the influence of tea and its components on human health and consumer purchasing behavior. The aim of the study was to analyze the habits of Polish consumers regarding tea consumption, brewing methods, and their choices related to tea, to describe the characteristics of tea consumers, and present their segmentation based on consumer choices and habits regarding tea consumption. The study was performed using the computer-assisted web interviewing (CAWI) method on a group of 1700 adult consumers of tea. Information about consumer choices and habits related to tea consumption was collected, including brewing method, place of tea consumption, and factors determining tea choices. Using cluster analysis, six groups of tea consumers were identified. These are “Occasional tea gourmets”, “Yerba mate drinkers”, “Tea gourmets”, “Occasional consumers”, “Undemanding tea consumers,” and “Occasional strong tea consumers”. In summary, it can be said that Poles are not tea gourmets; they prefer black tea, in bags, brewed in cups or glasses for up to 3 min, and usually drink teas without any additives, at home, several times a week, during breakfast and between meals. The most popular brand among the respondents was Lipton. Consumers have little knowledge of the health benefits of tea.

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“…Precisely, in a very similar approach with spiked samples, El-Sharif et al showed the potential of using haemoglobyn MIPs for differentiating meat species [108]. In another study, Chatterjee et al developed a polyacrylamide MIP sensor towards theaflavin, and attempted the correlation of the voltammetric readings with the theaflavin content estimated by HPLC by means of partial least squares regression (PLS) employing a leave-one-out (LOO) approach; the study demonstrated good agreement between both, although further validation might be required due to the reduced number of samples and the use of LOO validation [109]. Lastly, in our laboratory, the application of a MIP-based ET towards the determination of volatile phenols in wines with the Brett defect was also reported [59].…”

Section: Conclusion and Future Trendsmentioning

confidence: 99%

Molecularly imprinted polymers - towards electrochemical sensors and electronic tongues

2021

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Molecularly imprinted polymers (MIPs) are artificially synthesized materials to mimic the molecular recognition process of biological macromolecules such as substrate-enzyme or antigen-antibody. The combination of these biomimetic materials with electrochemical techniques has allowed the development of advanced sensing devices, which significantly improve the performance of bare or catalyst-modified sensors, being able to unleash new applications. However, despite the high selectivity that MIPs exhibit, those can still show some cross-response towards other compounds, especially with chemically analogous (bio)molecules. Thus, the combination of MIPs with chemometric methods opens the room for the development of what could be considered a new type of electronic tongues, i.e. sensor array systems, based on its usage. In this direction, this review provides an overview of the more common synthetic approaches, as well as the strategies that can be used to achieve the integration of MIPs and electrochemical sensors, followed by some recent examples over different areas in order to illustrate the potential of such combination in very diverse applications.

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Detection of theaflavins in black tea using a molecular imprinted polyacrylamide-graphite nanocomposite electrode

Cited by 42 publications

References 47 publications

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Consumer Choices and Habits Related to Tea Consumption by Poles

Molecularly imprinted polymers - towards electrochemical sensors and electronic tongues

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