Voltammetric determination of thujone in herbal matrices in the presence of Triton X-100

Kowalcze, Mateusz; Jakubowska, Małgorzata

doi:10.1016/j.ab.2017.11.024

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…Triton X-100 is a highly hydrophobic nonionic surfactant with an average of 95 ethoxy groups. In this study, Triton X-100 was selected because of its outstanding tendency to be adsorbed on the working electrode surface (55). The potential interference from Triton X-100 was assessed by varying the surfactant concentration in a solution of artificial seawater that was spiked with 0.01 µM PO4 3− (Figure 6A).…”

Section: Figurementioning

confidence: 99%

NaOH Pretreated Molybdate-Carbon Paste Electrode for the Determination of Phosphate in Seawater by Square Wave Voltammetry with Impedimetric Evaluation

Altahan¹,

Achterberg²,

Galal³

et al. 2021

J. Electrochem. Soc.

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Here we describe a new electrochemical sensor for PO4 3− detection in seawater. In this work, we prepared a carbon paste electrode (CPE) modified with molybdate and pretreated in 0.1 M NaOH using cyclic voltammetry (CV). The modified CPE was employed for the determination of PO4 3− in artificial seawater (35 g/L NaCl) acidified with sulfuric acid to pH 0.8. An additional cleaning step (cyclic voltammetry (CV)) of 10 cycles in 0.1 M NaOH at −0.5 to 0.5 V was required between PO4 3− determinations to dissolve the phosphomolybdic complex formed on the surface of the working electrode. Electrochemical impedance spectroscopy (EIS) results confirmed that the molybdate-modified CPE (molybdate/CPE) exhibited a low charge-transfer resistance (Rct) toward PO4 3−, and showed an improved analytical performance for different concentrations of PO4 3−. A calibration plot in the range of 0.01–5 µM with a limit of detection (LOD) of 0.003 µM was obtained. The proposed electrode demonstrated good precision (4.3% and 5.8%) for concentrations of 5 and 0.2 µM, respectively. The proposed method was employed to analyze PO4 3− in seawater samples on a research cruise in the North Sea, with results in close agreement to those obtained using conventional colorimetric measuremen

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Section: Figurementioning

confidence: 99%

NaOH Pretreated Molybdate-Carbon Paste Electrode for the Determination of Phosphate in Seawater by Square Wave Voltammetry with Impedimetric Evaluation

Altahan¹,

Achterberg²,

Galal³

et al. 2021

J. Electrochem. Soc.

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“…A surfactant is a substance with hydrophilic moieties on its head and hydrophobic moieties on its tail. One of the non-ionic surfactants is Triton x-100, which is classified as a strongly hydrophobic surfactant with about 95 ethoxy groups [ 37 ]. The influence of Triton x-100 on our peak currents was tested by a series of concentrations of Triton x-100 in a solution of 1 µM PO 4 3− (pH 0.8), and the peak current of molybdate/CPE and the corrected voltammogram were measured and compared to determine the improvements obtained by the application of our bi-potentiostat method.…”

Section: Resultsmentioning

confidence: 99%

The Use of Bi-Potentiostat as a Simple and Accurate Electrochemical Approach for the Determination of Orthophosphate in Seawater

Altahan

Espósito

Bogner

et al. 2023

Sensors

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Autonomous on-site monitoring of orthophosphate (PO43−), an important nutrient for primary production in natural waters, is urgently needed. Here, we report on the development and validation of an on-site autonomous electrochemical analyzer for PO43− in seawater. The approach is based on the use of flow injection analysis in conjunction with a dual electrochemical cell (i.e., a bi-potentiostat detector (FIA-DECD) that uses two working electrodes sharing the same reference and counter electrode. The two working electrodes are used (molybdate/carbon paste electrode (CPE) and CPE) to correct for matrix effects. Optimization of squarewave voltammetry parameters (including step potential, amplitude, and frequency) was undertaken to enhance analytical sensitivity. Possible interferences from non-ionic surfactants and humic acid were investigated. The limit of quantification in artificial seawater (30 g/L NaCl, pH 0.8) was 0.014 µM for a linear concentration range of 0.02–3 µM. The system used a Python script for operation and data processing. The analyzer was tested for ship-board PO43- determination during a four-day research cruise in the North Sea. The analyzer successfully measured 34 samples and achieved a good correlation (Pearson’ R = 0.91) with discretely collected water samples analyzed using a laboratory-based colorimetric reference analyzer.

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“…Furthermore, the present study also sheds light in potential applications of electroanalytical tools such as voltammetry to assess antioxidant quality in vegetal material. Moreover, although it was not further investigated in this work, the clear peak definition obtained through voltammetric assessment may be a valuable tool to briefly analyze plant secondary metabolites, such as phenolic compounds, using minute solvent volumes [18][19][20][21].…”

Section: Samples Comparisonmentioning

confidence: 99%

“…This work is therefore intended to shed light on Ba antioxidant quality through an all-encompassing voltammetric assessment of commercially available Carqueja vegetal mater. The study protocol was adapted from previous works published by our group [18][19][20][21], henceforth, samples were assessed and studied concerning their antioxidant © 2018 Life Science Informatics Publication All rights reserved Peer review under responsibility of Life Science Informatics Publications 2018 July -August RJLBPCS 4(4) Page No.241 capabilities as well their redox processes through CV, SWV and DPV.…”

Section: Introductionmentioning

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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Voltammetric determination of thujone in herbal matrices in the presence of Triton X-100

Cited by 8 publications

References 22 publications

NaOH Pretreated Molybdate-Carbon Paste Electrode for the Determination of Phosphate in Seawater by Square Wave Voltammetry with Impedimetric Evaluation

NaOH Pretreated Molybdate-Carbon Paste Electrode for the Determination of Phosphate in Seawater by Square Wave Voltammetry with Impedimetric Evaluation

The Use of Bi-Potentiostat as a Simple and Accurate Electrochemical Approach for the Determination of Orthophosphate in Seawater

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