Analysis of total polyphenols in wines by FIA with highly stable amperometric detection using carbon nanotube-modified electrodes

Arribas, Alberto Sánchez; Martínez-Fernández, Marta; Moreno, Mónica Cárdenas; Bermejo, Esperanza; Zapardiel, Antonio; Chicharro, Manuel

doi:10.1016/j.foodchem.2012.09.027

Cited by 46 publications

(25 citation statements)

References 36 publications

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“…). Conversely, a remarkable decrease of current signals was observed in the second and subsequent scans when all three anodic waves were traversed, thus suggesting the involvement in the last two waves of fouling phenomena occurring at the working electrode surface, as it is frequently observed when monophenol moieties are oxidized at graphite electrodes .…”

Section: Resultsmentioning

confidence: 88%

Simple pencil‐drawn paper‐based devices for one‐spot electrochemical detection of electroactive species in oil samples

et al. 2015

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We propose here simple electrochemical cells assembled with electrodes pencil drawn on paper for conducting one-spot tests enabling olive oil to be easily distinguished from other vegetable oils. They consist of small circular pads of hydrophilic paper defined by hydrophobic barriers, these last printed by using custom-designed rubber stamps, where working, reference, and counterelectrodes are drawn by pencil leads. These cells were first wetted with a small volume of aqueous electrolyte, avoiding coating of the upper surface of electrodes. A controlled volume of edible oil samples was then applied on top of the moist cell. The results found proved that these devices can be adopted as effective platforms suitable for the detection of electroactive compounds present in edible oils. In fact, they allow voltammetric profiles to be recorded not only for the oxidation of water soluble species (ortho-diphenols, as well as some monophenols and polyphenols) present in olive oils, but also for electroactive hydrophobic components (e.g., α-tocopherol) present in sunflower oils, which were chosen as model of seed oils. The whole of collected findings pointed out that simple one-spot tests performed by these devices enable olive oils to be easily distinguished from other edible oils on the basis of their clearly different voltammetric profiles. A satisfactory interdevice reproducibility (±13%) was estimated by applying strictly similar extra virgin olive oil samples onto seven different cells carefully prepared by the same procedure. An operating mechanism able to account for the detection of also electroactive hydrophobic compounds present in oils is proposed.

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Section: Resultsmentioning

confidence: 88%

Simple pencil‐drawn paper‐based devices for one‐spot electrochemical detection of electroactive species in oil samples

et al. 2015

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“…A representative example is the use of carbon nanotubes as surface modifier in carbon-based electrodes, enabling better electron-transfer kinetics for polyphenol oxidation and enhanced operational stability in FIA systems. The detection of wine phenolic compounds such as gallic acid, caffeic acid, ferulic acid and p-coumaric acid was achieved at lower overpotentials and with increased sensitivity on carbon nanotubes (CNT)-modified electrodes compared to bare GCE electrodes [3,65] ( Figure 4A). In another study, a GCE modified with a suspension of MWCNT in polyethyleneimine (PEI) displayed good operational stability in FIA experiments, protection against fouling and against passivation due to the adsorbed oxidation product of polyphenols [3] ( Figure 4B).…”

Section: Direct Oxidation Of Phenolic Compounds From Wines On Bare Ormentioning

confidence: 99%

“…The detection of wine phenolic compounds such as gallic acid, caffeic acid, ferulic acid and p-coumaric acid was achieved at lower overpotentials and with increased sensitivity on carbon nanotubes (CNT)-modified electrodes compared to bare GCE electrodes [3,65] ( Figure 4A). In another study, a GCE modified with a suspension of MWCNT in polyethyleneimine (PEI) displayed good operational stability in FIA experiments, protection against fouling and against passivation due to the adsorbed oxidation product of polyphenols [3] ( Figure 4B). Upon testing for 4 days at +0.7 V with 40 wine tests each day, the sensor response decreased to 70% of the initial value, which represents an appropriate stability for monitoring fermentation processes.…”

Section: Direct Oxidation Of Phenolic Compounds From Wines On Bare Ormentioning

confidence: 99%

“…One cycle was followed by 20 successive injections of p-coumaric acid and then by six cycles of injections. Reproduced from [65], with permission from the American Chemical Society (A) and from [3], with permission from Elsevier (B).…”

Section: Direct Oxidation Of Phenolic Compounds From Wines On Bare Ormentioning

confidence: 99%

“…The work on the amperometric detection of polyphenols with CNT-modified carbon electrodes in FIA systems [3], combined with the commercial availability of various screen-printed CNT-modified electrodes, paves the way for facile, cost-effective and robust analytical devices to be used in on-line systems for the monitoring of phenolic compounds and related parameters during wine production. (1), gallic (2), ferulic (3) and p-coumaric (4) acids.…”

Section: Direct Oxidation Of Phenolic Compounds From Wines On Bare Ormentioning

confidence: 99%

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Progress in Electrochemical (Bio)Sensors for Monitoring Wine Production

et al. 2019

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Electrochemical sensors and biosensors have been proposed as fast and cost effective analytical tools, meeting the robustness and performance requirements for industrial process monitoring. In wine production, electrochemical biosensors have proven useful for monitoring critical parameters related to alcoholic fermentation (AF), malolactic fermentation (MLF), determining the impact of the various technological steps and treatments on wine quality, or assessing the differences due to wine age, grape variety, vineyard or geographical region. This review summarizes the current information on the voltamperometric biosensors developed for monitoring wine production with a focus on sensing concepts tested in industry-like settings and on the main quality parameters such as glucose, alcohol, malic and lactic acids, phenolic compounds and allergens. Recent progress featuring nanomaterial-enabled enhancement of sensor performance and applications based on screen-printed electrodes is emphasized. A case study presents the monitoring of alcoholic fermentation based on commercial biosensors adapted with minimal method development for the detection of glucose and phenolic compounds in wine and included in an automated monitoring system. The current challenges and perspectives for the wider application of electrochemical sensors in monitoring industrial processes such as wine production are discussed.

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Nanotechnology-enabled approaches for the detection of antioxidants by spectroscopic and electrochemical methods

Rauhut

Bülbül

Andreescu

2017

Measurement of Antioxidant Activity &Amp; Capacity

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Analysis of total polyphenols in wines by FIA with highly stable amperometric detection using carbon nanotube-modified electrodes

Cited by 46 publications

References 36 publications

Simple pencil‐drawn paper‐based devices for one‐spot electrochemical detection of electroactive species in oil samples

Simple pencil‐drawn paper‐based devices for one‐spot electrochemical detection of electroactive species in oil samples

Progress in Electrochemical (Bio)Sensors for Monitoring Wine Production

Nanotechnology-enabled approaches for the detection of antioxidants by spectroscopic and electrochemical methods

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