Breath-Based Electrochemical Sensors: Simultaneous Determination of Ethanol and Smoking By-Products

The rapid detection of trace metals is one of the most important aspect in achieving environmental monitoring and protection. Electrochemical sensors remain a key solution for rapid detection of heavy metals in environmental water matrices. This paper reports the fabrication of an electrochemical sensor obtained by the simultaneous electrodeposition of MnO2 nanoparticles and RGO nanosheets on the surface of a glassy carbon electrode. The successful electrodeposition was confirmed by the enhanced current response on the cyclic voltammograms. The XRD, HR-SEM/EDX, TEM, FTIR, and BET characterization confirmed the successful synthesis of MnO2 nanoparticles, RGO nanosheets, and MnO2@RGO nanocomposite. The electrochemical studies results revealed that MnO2@RGO@GCE nanocomposite considerably improved the current response on the detection of Zn(II), Cd(II) and Cu(II) ions in surface water. These remarkable improvements were due to the interaction between MnO2 nanomaterials and RGO nanosheets. Moreover, the modified sensor electrode portrayed high sensitivity, reproducibility, and stability on the simultaneous determination of Zn(II), Cd(II), and Cu(II) ions. The detection limits of (S/N = 3) ranged from 0.002–0.015 μg L−1 for the simultaneous detection of Zn(II), Cd(II), and Cu(II) ions. The results show that MnO2@RGO nanocomposite can be successfully used for the early detection of heavy metals with higher sensitivity in water sample analysis.

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Copper(I)-Catalyzed Click Chemistry as a Tool for the Functionalization of Nanomaterials and the Preparation of Electrochemical (Bio)Sensors

Sensors ◽

10.3390/s19102379 ◽

2019 ◽

Vol 19 (10) ◽

pp. 2379 ◽

Cited By ~ 9

Author(s):

P. Yáñez-Sedeño ◽

A. González-Cortés ◽

S. Campuzano ◽

J. M. Pingarrón

Keyword(s):

Electrochemical Sensors ◽

Functional Integration ◽

Future Directions ◽

Physiological Conditions ◽

Electrode Surfaces ◽

Wide Range ◽

High Yields ◽

By Products ◽

Powerful Strategy

Proper functionalization of electrode surfaces and/or nanomaterials plays a crucial role in the preparation of electrochemical (bio)sensors and their resulting performance. In this context, copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) has been demonstrated to be a powerful strategy due to the high yields achieved, absence of by-products and moderate conditions required both in aqueous medium and under physiological conditions. This particular chemistry offers great potential to functionalize a wide variety of electrode surfaces, nanomaterials, metallophthalocyanines (MPcs) and polymers, thus providing electrochemical platforms with improved electrocatalytic ability and allowing the stable, reproducible and functional integration of a wide range of nanomaterials and/or different biomolecules (enzymes, antibodies, nucleic acids and peptides). Considering the rapid progress in the field, and the potential of this technology, this review paper outlines the unique features imparted by this particular reaction in the development of electrochemical sensors through the discussion of representative examples of the methods mainly reported over the last five years. Special attention has been paid to electrochemical (bio)sensors prepared using nanomaterials and applied to the determination of relevant analytes at different molecular levels. Current challenges and future directions in this field are also briefly pointed out.

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Simultaneous determination of halogenated neutral and acidic disinfection by-products in drinking water by closed-loop stripping extraction and capillary gas chromatography

Journal of Chromatography A ◽

10.1016/s0021-9673(99)00754-2 ◽

1999 ◽

Vol 857 (1-2) ◽

pp. 217-229 ◽

Cited By ~ 21

Author(s):

Adamantia A. Kampioti ◽

Euripides G. Stephanou

Keyword(s):

Gas Chromatography ◽

Drinking Water ◽

Simultaneous Determination ◽

Capillary Gas Chromatography ◽

Closed Loop ◽

By Products

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Microwave Preparation of Ionic Liquid Functionalized SBA-15 and its Application in Fabrication of Electrochemical Sensors

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.239-242.2748 ◽

2011 ◽

Vol 239-242 ◽

pp. 2748-2751

Author(s):

Peng Hui Zhang ◽

She Ying Dong ◽

Ting Lin Huang

Keyword(s):

Ionic Liquid ◽

Metal Ions ◽

Simultaneous Determination ◽

Electrochemical Sensors ◽

Good Sensitivity ◽

Dihydroxybenzene Isomers ◽

Functionalized Ionic Liquid ◽

Experimental Parameters ◽

Promising Application

Ionic liquid-functionalized SBA-15 (IL-SBA-15) was prepared by cocondensation of functionalized ionic liquid (IL) and tetraethoxysilane. IL was firstly synthesized using microwave and the experimental parameters were optimized. Furthermore, IL-SBA-15 was introduced into the fabrication of electrochemical sensors. It was found that these sensors exhibited good performance to the simultaneous determination of dihydroxybenzene isomers or metal ions. The good sensitivity and stability presented the promising application of IL-SBA-15 in the application of electrochemistry.

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A comparative study of various electrochemical sensors for hydrazine detection based on imidazole derivative and different nano-materials of MCM-41, RGO and MWCNTs: Using net analyte signal (NAS) for simultaneous determination of hydrazine and phenol

Journal of Electroanalytical Chemistry ◽

10.1016/j.jelechem.2017.01.006 ◽

2017 ◽

Vol 787 ◽

pp. 145-157 ◽

Cited By ~ 15

Author(s):

Ali Benvidi ◽

Maryam Nikmanesh ◽

Marzieh Dehghan Tezerjani ◽

Shahriar Jahanbani ◽

Mohammad Abdollahi ◽

...

Keyword(s):

Comparative Study ◽

Simultaneous Determination ◽

Electrochemical Sensors ◽

Imidazole Derivative ◽

Nano Materials ◽

Net Analyte Signal ◽

Analyte Signal ◽

Mcm 41

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Simultaneous Determination of Acrylamide and Hydroxymethylfurfural in Extruded Products by LC-MS/MS Method

Molecules ◽

10.3390/molecules24101971 ◽

2019 ◽

Vol 24 (10) ◽

pp. 1971 ◽

Cited By ~ 8

Author(s):

Antun Jozinović ◽

Bojan Šarkanj ◽

Đurđica Ačkar ◽

Jelena Panak Balentić ◽

Domagoj Šubarić ◽

...

Keyword(s):

Simultaneous Determination ◽

Limit Of Detection ◽

Raw Materials ◽

Extrusion Process ◽

Single Step ◽

Liquid Chromatography Tandem Mass ◽

Extruded Products ◽

Snack Products ◽

By Products

The aim of this study was to develop a liquid chromatography/tandem mass spectrometry LC-MS/MS method for the simultaneous determination of acrylamide and hydroxymethylfurfural (HMF) in corn snack products enriched with food industry by-products: brewer’s spent grain (BSG), sugar beet pulp (SBP) and apple pomace (AP). Development of the method included the study of different sources for ionization, different mobile phases, different extraction conditions as well as different methods of sample preparation. Finally, the single LC-MS/MS method was developed for the analysis of both analytes in one step with a duration of 20 min using a simple single-step extraction. The method with apparent recoveries of 91.4 and 90.4 for acrylamide and HMF, respectively, was applied for the analysis of non-extruded and extruded samples. The obtained results shown that the acrylamide content was <LOD (limit of detection) for all raw materials and non-extruded mixtures, while HMF increased proportionally to the content of added by-products in the mixtures. After the extrusion process, quantification of the acrylamide could be done in all samples. A higher amount of by-products entails higher contents of acrylamide and HMF, with the most significant effect in AP extrudates, where the highest content of HMF (6069 ± 789 ng/g) and acrylamide (5.37 ± 0.50 ng/g) in samples with 15% AP was observed.

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