Rapid determination of total polyphenolic content in tea samples based on caffeic acid voltammetric behaviour on a disposable graphite electrode

David, Iulia Gabriela; Bizgan, Ana-Maria Cristina; Popa, Dana Elena; Buleandră, Mihaela; Moldovan, Zenovia; Badea, Irinel Adriana; Tekiner, Tuğçe Ayça; Başağa, Hüveyda; Ciucu, Anton Alexandru

doi:10.1016/j.foodchem.2014.10.139

Cited by 75 publications

(55 citation statements)

References 36 publications

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“…After cooling, the infusion was filtered through Blue Ribbon Quantitative Whatman filter paper. After proper dilutions, the total phenolic content (TPC) of the freshly prepared infusions was analyzed in parallel by differential pulse voltammetry (DPV) and spectrophotometry (Folin-Ciocalteu procedure) (FC) (David et al 2015a). …”

Section: Preparation Of Tea Infusionmentioning

confidence: 99%

“…A new lead was used for each measurement. The electrical contact was assured by soldering a metal wire to the metallic part of the Rotring pencil (David et al 2013(David et al , 2015a(David et al , 2015b.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

“…This inconvenient can be avoided by using disposable electrodes like the wellknown screen printed electrodes and the pencil graphite electrode (PGE), the last one having the advantages of a good mechanical resistance and of being cheaper and readily commercially available. Despite the fact that the PGE was used for the voltammetric analysis of different types of compounds (David et al 2013(David et al , 2015a(David et al , 2015b but there are only two papers related to its use for the analysis of polyphenolic acids (e.g. caffeic acid) and the determination of TPC (Buratti et al 2008;David et al 2015a).…”

Section: Introductionmentioning

confidence: 99%

“…Despite the fact that the PGE was used for the voltammetric analysis of different types of compounds (David et al 2013(David et al , 2015a(David et al , 2015b but there are only two papers related to its use for the analysis of polyphenolic acids (e.g. caffeic acid) and the determination of TPC (Buratti et al 2008;David et al 2015a). Regarding the cyclic voltammetric behavior of RA on a PGE there is only an abstract of a poster presented by Uçar et al at the 10th International Electrochemistry Meeting, Konya-Turkey, 2013. Tea is the most popular beverage used all over the world either for simply pleasure or due to its health benefits which originate in the polyphenols contained in the dry material.…”

Section: Introductionmentioning

confidence: 99%

“…Because it was shown that teas global antioxidant activity is correlated with their total polyphenolic content (TPC), regardless of their polyphenols profile and without taking into consideration the contribution of each antioxidant polyphenol (Lee et al 2014;David et al 2015a), the developed method was applied to the assessment of the TPC expressed as mg rosmarinic acid equivalents (mg RAE)/g dry tea in different herbal teas. Despite the fact that gallic acid is the polyphenolic acid commonly used as reference for the TPC expression, in the present work RA was selected due to the fact that in the experimental conditions optimized in this study, RA presents a simpler voltammetric behavior, with only one quasireversible well-defined oxidation peak, in comparison with gallic acid and catechins which exhibit two irreversible oxidation peaks.…”

Section: Introductionmentioning

confidence: 99%

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Voltammetric determination of polyphenolic content as rosmarinic acid equivalent in tea samples using pencil graphite electrodes

et al. 2016

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The quasi-reversible, diffusion controlled behavior of rosmarinic acid (RA) on a disposable pencil graphite electrode (PGE) was established by cyclic voltammetry. Using the anodic oxidation peak presented by RA on the PGE a differential pulse voltammetric (DPV) method was developed for the quantitative determination of RA. The linear range was 10 −8 -10 −5 M RA and the detection and quantification limits were 7.93 × 10 −9 M and 2.64 × 10 −8 M RA, respectively. The applicability of the developed method was tested by recovery studies and by the assessment of the total polyphenolic contents (TPC DPV ) of green, white and black Turkish teas, which were found to be 40.74, 30.04 and 23.97 mg rosmarinic acid equivalent/g dry tea, respectively. These results were in good agreement with those obtained by the Folin-Ciocalteu method. The developed method is a sensitive and cheap tool for the rapid and precise evaluation of TPC DPV of tea samples.

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Section: Preparation Of Tea Infusionmentioning

confidence: 99%

Section: Electrochemical Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Voltammetric determination of polyphenolic content as rosmarinic acid equivalent in tea samples using pencil graphite electrodes

et al. 2016

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Caffeic acid attenuates the inflammatory stress induced by glycated LDL in human endothelial cells by mechanisms involving inhibition of AGE‐receptor, oxidative, and endoplasmic reticulum stress

et al. 2017

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Type 2 diabetes mellitus is a worldwide epidemic and its atherosclerotic complications determine the high morbidity and mortality of diabetic patients. Caffeic acid (CAF), a phenolic acid present in normal diets, is known for its antioxidant properties. The aim of this study was to investigate CAF's anti-inflammatory properties and its mechanism of action, using cultured human endothelial cells (HEC) incubated with glycated low-density lipoproteins (gLDL). Levels of the receptor for advanced glycation end-products (RAGE), inflammatory stress markers (C reactive protein, CRP; vascular cell adhesion molecule-1, VCAM-1; monocyte chemoattractant protein-1, MCP-1), and oxidative stress and endoplasmic reticulum stress (ERS) markers were evaluated in gLDL-exposed HEC, in the presence/absence of CAF. RAGE silencing or blocking, specific inhibitors for oxidative stress (apocynin, N-acetyl-cysteine), and ERS (salubrinal) were used. The results showed that: (i) gLDL induced CRP synthesis and secretion through mechanisms involving NADPH oxidase-dependent oxidative stress and ERS in HEC; (ii) gLDL-RAGE interaction, oxidative stress, and ERS stimulated the secretion of VCAM-1 and MCP-1 in HEC; and (iii) CAF reduced the secretion of CRP, VCAM-1, and MCP-1 in gLDL-exposed HEC by inhibiting RAGE expression, oxidative stress, and ERS. In conclusion, CAF might be a promising alternative to ameliorate a wide spectrum of disorders due to its complex mechanisms of action resulting in anti-inflammatory and antioxidative properties. © 2017 BioFactors, 43(5):685-697, 2017.

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Hydrothermal Synthesis of Three Dimensional Graphene‐Multiwalled Carbon Nanotube Nanocomposite for Enhanced Electro Catalytic Oxidation of Caffeic Acid

2016

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Three dimensional graphene‐multiwalled carbon nanotube nano composite (3DG/MWCNTs−Nc) was synthesized by simple hydrothermal method for the amperometric determination of caffeic acid (CA). The prepared nanocomposite was characterized by scanning electron microscopic technique (SEM), ultraviolet‐visible spectroscopy (UV), Raman spectroscopy and infrared spectroscopy (IR). Moreover, the interfacial electron transfer properties of the modified electrode were carried out by the electro chemical impedance spectroscopy (EIS). Besides, the electro chemical performance of the modified electrode was carried out by the cyclic voltammetry (CV) and amperometric (i‐t) technique. The proposed electrode was exhibited an enhanced electrocatalytic activity towards the detection of CA. Under the optimal condition, the 3DG/MWCNTs−Nc modified electrode displayed a linear range from 0.2 to 174 μM, detection limit (LOD) 17.8 nM and sensitivity of 5.8308 μA μM−1 cm−2 and on applied potential + 0.2 V. These result showed, 3DG/MWCNTs−Nc modified electrodes showed good repeatability, reproducibility, and higher stability. In addition, the fabricated electrode was then successfully used to determine the CA in real samples with satisfactory recoveries. Which suggests that the 3DG/MWCNTs−Nc as a robust sensing materials for the electrochemical detection of CA.

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Rapid determination of total polyphenolic content in tea samples based on caffeic acid voltammetric behaviour on a disposable graphite electrode

Cited by 75 publications

References 36 publications

Voltammetric determination of polyphenolic content as rosmarinic acid equivalent in tea samples using pencil graphite electrodes

Voltammetric determination of polyphenolic content as rosmarinic acid equivalent in tea samples using pencil graphite electrodes

Caffeic acid attenuates the inflammatory stress induced by glycated LDL in human endothelial cells by mechanisms involving inhibition of AGE‐receptor, oxidative, and endoplasmic reticulum stress

Hydrothermal Synthesis of Three Dimensional Graphene‐Multiwalled Carbon Nanotube Nanocomposite for Enhanced Electro Catalytic Oxidation of Caffeic Acid

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