Electrochemical sensor for parabens based on molecular imprinting polymers with dual-templates

Wang, Yang; Cao, Yuhua; Cheng, Fang; Gong, Qianqian

doi:10.1016/j.aca.2010.05.039

Cited by 59 publications

(29 citation statements)

References 29 publications

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“…The results obtained show that parabens cannot be electrochemically identified in this medium. The same conclusions were drawn from the earlier electrochemical investigations [8,[29][30][31]] (see Sect. 1).…”

Section: Voltammetry At Microelectrodessupporting

confidence: 74%

“…3; Table 1), only their total content can be determined and should be expressed as an amount of PHB. This procedure is recommended by the EU Directives 95/2/EC and 76/768/ EEC and is described in literature [1,3,29,30].…”

Section: Voltammetry At Microelectrodesmentioning

confidence: 99%

“…They were mainly examined to evaluate the optimal conditions for their determination in real samples using electrochemical detectors [8,[29][30][31]. Wang et al [29] suggested a rapid and reliable electrochemical method to determine the total content of parabens in cosmetics on a GC electrode modified with polymers (MIPs) containing MP and PP as dual templates. The results described show that the parabens are oxidized on this modified electrode in phosphate-buffered aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

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Anodic oxidation of parabens in acetic acid–acetonitrile solutions

Michałkiewicz

2012

J Appl Electrochem

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The electrochemical properties of esters of p-hydroxybenzoic acid, called parabens, were investigated on a carbon fiber microelectrode and on a glassy carbon macroelectrode in glacial acetic acid containing 20 % acetonitrile (v/v) and sodium acetate as a supporting electrolyte. The anodic oxidation of parabens in this medium proceeds in a single stage giving well-shaped peaks or waves in the same potential region of above 1.0 V (vs. Ag/AgCl). The electrode process was characterized as being quasireversible, diffusion-controlled, and proceeds with the exchange of one electron and one proton. Phenoxyl radicals as products of the electrode process are chemically unstable and participate in the successive irreversible homogenous reactions resulting in electroinactive products (E q C i mechanism). Smaller oxidation potentials for parabens in comparison to such unsaturated fatty acids as oleic, linoleic, and linolenic ones indicate that these compounds can show antioxidative properties. Since parabens are often used as preservatives in many products, the results presented can be found useful in the determination of their total content in real samples.

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Section: Voltammetry At Microelectrodessupporting

confidence: 74%

Section: Voltammetry At Microelectrodesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Anodic oxidation of parabens in acetic acid–acetonitrile solutions

Michałkiewicz

2012

J Appl Electrochem

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“…Another method for immobilizing the polymer onto the surface of the electrode was developed by Wang, et al [63]. The authors prepared a polymeric solution with two templates (methylparaben and propylparaben) and then dropped it onto the surface of the GCE.…”

Section: Mip Based Sensorsmentioning

confidence: 99%

Applications of molecularly imprinted polymers to the analysis and removal of personal care products: A review

Figueiredo

Erny

Santos

et al. 2016

Talanta

145

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Personal-care products (PCPs) involve a variety of chemicals whose persistency along with their constant release into the environment raised concern to their potential impact on wildlife and humans health. Regarded as emergent contaminants, PCPs demonstrated estrogenic activity leading to the need of new methodologies to detect and remove those compounds from the environment.Molecular imprinting starts with a complex between a template molecule and a functional monomer, which is then polymerized in the presence of a cross-linker. After template removal, the polymer will contain specific cavities. Based on a good selectivity towards the template, molecularly imprinted polymers (MIPs) have been investigated as efficient materials for the analysis and extraction of the so called emergent pollutants contaminants.Rather than lowering the limit of detections, the key theoretical advantage of MIP over existing methodologies is the potential to target specific chemicals. This unique feature, sometime named specificity (as synonym to very high selectivity) allows to use cheap, simple and/or rapid quantitative techniques such as fast separation with ultra-violet (UV) detection, sensors or even spectrometric techniques. When a high degree of selectivity is achieved samples extracted with MIPs can be directly analysed without the need of a separation step. However, while some papers clearly demonstrated the specificity of their MIP toward the targeted PCP, such prove is often lacking, especially with real matrices, making it difficult to assess the success of the different approaches.This review paper focusses on the latest development of MIPs for the analysis of personal care products in the environment, with particular emphasis on design, preparation and practical applications of MIPs.3

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“…The analysis methods were published by using HPLC [4,5], LC-MS/MS [6], GC [7], GC-MS [8], electrochemistry [9] for determining parabens in food and cosmetic products, waters and wastewaters and indoor dust. But their preconcentration techniques, such as liquid-liquid extraction, solid-phase extraction (SPE) [10] can lead to high blank values, which limit detection due to complex matrices.…”

Section: Introductionmentioning

confidence: 99%

Preparation and evaluation of molecularly imprinted microspheres for solid‐phase extraction of 1,4‐hydroxybenzoic acid esters in soy

Shen

Chen

et al. 2011

J of Separation Science

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Molecularly imprinted microspheres (MIMs) were prepared by precipitation polymerization for the binding and recognition of 1,4-hydroxybenzoic acid esters. Ethyl p-hydroxybenzoate (EtPHB) was used as the template molecule, methacrylic acid as the functional monomer, ethylene dimethacrylate as the linking agent. It was evaluated by solid-phase extraction column packed with MIMs combined with liquid chromatography to determine trace preservatives including benzoic acid, methyl p-hydroxybenzoate, EtPHB, propyl p-hydroxybenzoate in food products. A solid-phase extraction based on MIM procedure was used to isolate four additives from the food matrix before quantitative analysis. The Scatchard plot suggested that the template-polymer system had two-site binding behavior with the dissociation constants of 0.3577 and 3.952 mg/g, respectively. The rebinding test, based on the molecularly imprinted solid-phase extraction column technique, showed the recoveries of soy samples spiked with four additives within 88.4-110.6%, with the relative standard deviations of 1.97-3.82%. Finally, the method was successfully applied for the analysis of parabens in foodstuff without traditional pretreatment.

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Electrochemical sensor for parabens based on molecular imprinting polymers with dual-templates

Cited by 59 publications

References 29 publications

Anodic oxidation of parabens in acetic acid–acetonitrile solutions

Anodic oxidation of parabens in acetic acid–acetonitrile solutions

Applications of molecularly imprinted polymers to the analysis and removal of personal care products: A review

Preparation and evaluation of molecularly imprinted microspheres for solid‐phase extraction of 1,4‐hydroxybenzoic acid esters in soy

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