Amperometric detection of carbohydrates based on the glassy carbon electrode modified with gold nano-flake layer

Nguyen, Hong Ha; Nguyen, The-Vinh; Nguyen, Khac Manh; Nguyen, Anh Gia-Tuan; Hiến, Nguyễn Quốc

doi:10.1016/j.ancr.2015.06.001

Cited by 4 publications

(2 citation statements)

References 21 publications

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“…From the results, the maximum current response was observed at 0.9-1 V. Unlike a diffusion limited process, the current responses at higher potential exhibit decreased signals which is similar for all investigated amino acids. A similar behavior from other molecules in alkaline condition was observed on other metal electrodes [152] and it is in agreement with this work. Therefore, an operating potential of 1 V was chosen in the next experiments in order to achieve the best compromise of signal-to-noise ratio (S/N) for all amino acids in this work.…”

Section: Detection Of Amino Acids On Cu Electrodesupporting

confidence: 93%

Development of electrochemical and colorimetric methods using inorganic nanomaterials for detection of biological and environmental compounds

Pinyorospathum

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This research comprised of 2 parts including (1) lab-on-paper coupled with electrochemical method for C-reactive protein and colorimetric detection for phosphate ions and (2) the development of chromatographic techniques and its applications. In each part, it can be classified in 2 works. The first work of lab-on-paper is the electrochemical sensor that was fabricated from phosphorylcholine assembled electrodeposited gold nanoparticles onto screen-printed carbon electrode for C-reactive protein detection. Current of ferrocyanide decrease linearly when increase C-reactive protein concentration from 5.0 5000 ?g L??. The calculated detection limit equals 1.60 ?g L??. The final part of lab-on-paper is the colorimetry on paper for phosphate ions using 2-mercaptoethanesulfonate modified silver nanoplates. The color changes rely on anti-aggregation mechanism of modified silver nanoplates and europium ions. The paper-based analytical device can use the naked-eye for detection from purple color changing to pink when increase phosphate concentration. The linearity and detection limit are in the range of 1.0 30 mg L?? and 1.0 mg L??, respectively. For the development of chromatographic techniques and its applications, the first part is the separation of 4 important insecticides; dinotefuran, thiamethoxam, clothianidin, and imidacloprid using ultra-high-performance liquid chromatography coupled with amperometry detection. The complete separation was finished within 8 minutes using reverse-phase chromatography. The analytical signals increase when employing electrodeposited copper-gold nanoparticles. The detection limit and linear range of 4 significant insecticides were in the range of 0.19 0.62 mg L?? and 1.0 250 mg L??, respectively. The second work is the separation of amino acids using open tubular liquid chromatography. The current signals were measured on copper electrode. The separation of amino acids depends on the ion exchange affinity between quaternary amine on the resin and amino acids. The electrochemical detection arises from the oxidation of copper to form complexes between copper and amino acid. The developed method has detection limit of 0.42 mg L??. Moreover, all presented methods are simple, fast, and inexpensive. The methods are applied in real samples covering food, environmental compounds, and biomarkers.

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Section: Detection Of Amino Acids On Cu Electrodesupporting

confidence: 93%

Development of electrochemical and colorimetric methods using inorganic nanomaterials for detection of biological and environmental compounds

Pinyorospathum

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“…Hughes and Johnson (1981) first reported the use of PAD in platinum electrodes for detection of carbohydrates following liquid chromatography separation in 1981. This approach has been developed and applied extensively as a detection technique for various substances, including carbohydrates (Rohrer et al, 2013;Nguyen et al, 2015;Jamaluddin Ahmed and Smith, 2015), cyanides (Wu et al, 2015), amines, and organo-sulfur compounds (Lee and Yeo, 2001). Flow injection (FI) analysis is an automated analysis method developed in recent years and is widely used in many fields (Nabi et al, 1996;Peng et al, 2015) with advantages including high efficiency and simplicity (Chetty and Surendra, 2016;Yan et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Determination of chlorine ions in raw milk by pulsed amperometric detection in a flow injection system

Chen

Bei-bei

et al. 2018

Journal of Dairy Science

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Chloride ion concentration in milk was determined by pulsed amperometric detection in a flow injection system. Results showed that the Au electrode lost 3 electrons at 1.10 V and formed chloroaurate ions (AuCl) by combining with chloride ions, after which AuCl was partly reduced to Au at 0.6 V. Based on the electrochemical process, a triple waveform with detection potential of 1.15 V, detection time of 150 ms, oxidation potential of 1.4 V, oxidation time of 550 ms, reduction potential of 0 V, and reduction time of 400 ms was applied to the Au electrode for detecting chloride ion concentration in milk. The approach is rapid and automatic and features a detection limit of 0.005 g/L. The relative standard deviation obtained by 60 repetitive injections reached 1.48% at 2 g/L of NaCl. The method developed using the Au electrode without modification was used to analyze the chloride ion concentration in raw milk without preprocessing. The method showed good agreement with potentiometric titration.

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A state-of-the-art approach to synthesis of dendrite-like gold nanostructures via electrodeposition

2020

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Amperometric detection of carbohydrates based on the glassy carbon electrode modified with gold nano-flake layer

Cited by 4 publications

References 21 publications

Development of electrochemical and colorimetric methods using inorganic nanomaterials for detection of biological and environmental compounds

Development of electrochemical and colorimetric methods using inorganic nanomaterials for detection of biological and environmental compounds

Determination of chlorine ions in raw milk by pulsed amperometric detection in a flow injection system

A state-of-the-art approach to synthesis of dendrite-like gold nanostructures via electrodeposition

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