scholarly journals Graphene and Chitosan Composite Film Modified Electrode as a Sensitive Voltammetric Sensor for Tyrosine Detection in Food and Biological Samples

2021 ◽  
Author(s):  
Yuezhong Luo ◽  
Zhongying Li
Keyword(s):  
Biological Samples ◽  
Linear Sweep Voltammetry ◽  
Voltammetric Sensor ◽  
Modified Glassy Carbon Electrode ◽  
Linear Sweep ◽  
Serum Samples ◽  
Accurate Analysis ◽  
Experimental Conditions ◽  
Peak Current ◽  
Chitosan Composite

Abstract A voltammetric sensor made from a graphene and chitosan modified glassy carbon electrode (GR-CTS/GCE) was fabricated for accurate analysis of tyrosine (Tyr) in both food and biological samples. The surface morphology of the electrode and the properties of the electrode-electrolyte interface were determined by scanning electron microscopy and cyclic voltammetry. Compared with a bare GCE, the synergistic effect of GR and CTS is obvious. The peak current increases 35.6 times. The experimental conditions were optimized by second derivative linear sweep voltammetry (SDLSV) and Tyr was quantitatively analyzed on the electrode. The study shows that the oxidation peak current of Tyr obtained in 0.1 M pH 2.7 phosphate buffer is proportional to its concentration between 0.006-0.8 and 0.8-10.0 μM, with the low detection limit being 4.0 nM (signal/noise = 3). Excellent anti-interference ability was demonstrated by investigating the voltammetric response of Tyr in mixtures containing other biomolecules. In addition, the sensor exhibited good stability and repeatability. Through the detection of Tyr in milk and serum samples, the effectiveness of the sensor was studied, and the results were satisfactory.

Anodic Voltammetric Behavior of Lincomycin and its Electroanalytical Determination in Pharmaceutical Dosage form and Urine at Gold Electrode

2017 ◽  
Vol 231 (5) ◽  
Author(s):  
Jyothi C. Abbar ◽  
Manjunath D. Meti ◽  
Sharanappa T. Nandibewoor
Keyword(s):  
Gold Electrode ◽  
Dosage Form ◽  
Oxidation Process ◽  
Linear Sweep Voltammetry ◽  
Linear Sweep ◽  
Experimental Conditions ◽  
Pharmaceutical Dosage Form ◽  
Antibiotic Drug ◽  
Voltammetric Behavior

AbstractThe anodic voltammetric behavior of an antibiotic drug, lincomycin hydrochloride (LIN) at gold electrode (GE) has been investigated using cyclic and linear sweep voltammetry. The dependence of the current on pH, concentration and scan rate were investigated to optimize the experimental conditions for the determination of lincomycin. The anodic peak was characterized and the process was adsorption-controlled. The number of electrons transferred in the oxidation process was calculated. In the range of 8.0×10

A Simple and Sensitive Voltammetric Method for the Determination of Orange II Based on a Functionalized Graphene-Modified Electrode

2016 ◽  
Vol 99 (5) ◽  
pp. 1287-1294 ◽  
Author(s):  
Yudong Gao ◽  
Zhengkun Xie ◽  
Yulong Zhang ◽  
Lina Zou ◽  
Baoxian Ye
Keyword(s):  
Phosphate Buffer Solution ◽  
Linear Sweep Voltammetry ◽  
Food Samples ◽  
Orange Ii ◽  
Voltammetric Sensor ◽  
Functionalized Graphene ◽  
Modified Glassy Carbon Electrode ◽  
Buffer Solution ◽  
Accumulation Ability

Abstract A simple and sensitive voltammetric sensor for Orange II was developed, based on a poly(sodium p-styrenesulfonate)-functionalized graphene-modified glassy carbon electrode. This voltammetric sensor showed strong accumulation ability and an excellent voltammetric response for Orange II. The electrochemical behavior of Orange II was systematically investigated in a pH 7.0 phosphate buffer solution. By linear sweep voltammetry, under optimum conditions, a good linear relationship was obtained between peak currents and Orange II concentrations in the wider range of 3 × 10−8 to 5 × 10−6 mol/L, with an LOD of 1 × 10−8 mol/L. In addition, the proposed Orange II sensor was successfully applied to real food samples with satisfactory recovery.

Corrosion behavior of martensitic/ferritic oxide dispersed strengthened steels in nitric media

2011 ◽  
Vol 1298 ◽  
Author(s):  
Benoit Gwinner ◽  
Martin Auroy ◽  
Dominique Mas ◽  
Audrey Saint-Jevin
Keyword(s):  
Nitric Acid ◽  
Corrosion Behavior ◽  
Acid Concentration ◽  
Chromium Content ◽  
Nitric Acid Concentration ◽  
Linear Sweep Voltammetry ◽  
Linear Sweep ◽  
Experimental Conditions ◽  
Electrochemical Tests ◽  
Corrosion Kinetics

ABSTRACTThe corrosion behavior of three martensitic/ferritic oxide dispersed strengthened (ODS) steels with different chromium contents (respectively 9, 14 and 18wt %) has been studied in hot and concentrated nitric acid. Immersion and electrochemical tests have been carried out in different experimental conditions (temperature and nitric acid concentration). In each case, the corrosion kinetics has been characterized by mass loss measurement of samples (immersion tests) and the electrochemical behavior by linear sweep voltammetry techniques. The dependency of the corrosion rate with the chromium content in the steel, the nitric acid concentration and the temperature, has been quantitatively established and qualitatively discussed.

scholarly journals Sensitive voltammetric detection of yeast RNA based on its interaction with Victoria Blue B

2009 ◽  
Vol 74 (12) ◽  
pp. 1467-1476 ◽  
Author(s):  
Weili Zhang ◽  
Xueliang Niu ◽  
Na Zhao ◽  
Wei Sun
Keyword(s):  
Interaction Mechanism ◽  
Linear Sweep Voltammetry ◽  
Reduction Peak ◽  
Linear Sweep ◽  
Buffer Solution ◽  
Peak Current ◽  
Voltammetric Detection ◽  
Voltammetric Studies ◽  
Rna Complex

Voltammetric studies of the interaction of yeast RNA (y-RNA) with Victoria Blue B (VBB) are described in this paper. Furthermore, a linear sweep voltammetric method for the detection of y-RNA was established. The reaction conditions, such as acidity and amount of buffer solution, the concentration of VBB, the reaction time and temperature, etc., were carefully investigated by second order derivative linear sweep voltammetry. Under the optimal conditions, the reduction peak current of VBB at -0.75V decreased greatly after the addition of y-RNA to the solution without any shift of the reduction peak potential. Based on the decrease of the peak current, a new quantitative method for the determination of y-RNA was developed. The effects of co-existing substances on the determination were carefully investigated and three synthetic samples were determined with satisfactory results. The stoichiometry of the VBB-y-RNA complex was calculated by linear sweep voltammetry and the interaction mechanism is discussed.

scholarly journals Voltammetric investigation on interaction of Hyaluronic Acid with crystal violet and its analytical application

2013 ◽  
Vol 9 (2) ◽  
pp. 1900-1910
Author(s):  
WeiLi Zhang ◽  
XueLiang Niu ◽  
Ping Ping Zhang ◽  
Wei Sun
Keyword(s):  
Hyaluronic Acid ◽  
Crystal Violet ◽  
Linear Sweep Voltammetry ◽  
Electrochemical Determination ◽  
Linear Sweep ◽  
Buffer Solution ◽  
Reaction Conditions ◽  
Peak Current ◽  
The Difference ◽  
Optimized Conditions

In this paper, the interaction of hyaluronic acid (HA) with crystal violet (CV) was investigated carefully by linear sweep voltammetry on the dropping mercury working electrode (DME). In pH 5.0 Britton-Robinson (B-R) buffer solution, CV has a sensitive, well-defined second order derivative linear sweep voltammetric reductive wave at –0.85 V (vs. SCE). After adding a certain amount of HA into CV solution, the reductive peak current decreased without any shift of reductive peak potential. Based on the difference in the reductive peak current, a new voltammetric method for the detection of HA was established. The reaction conditions and the electrochemical determination were studied and optimized. Under the optimized conditions, the decrease of peak current showed a good linear relationship with the HA concentration in the range from 10.0 to 40.0 mg/L. The linear regression equation was got as ∆ip″(nA)= 84.07 C–527.86  (mg/L) (n=8, γ=0.997) and the detection limit was calculated as 2.65 mg/L (3σ). This new established method was further used to HA determination in the synthetic samples with satisfactory results and good recovery. The stoichiometry of CV-HA complex was calculated and the binding mechanism was also discussed by the electrochemical data.

scholarly journals Quantification of 4-Nitrophenol on Nanosize Polyaniline Modified Glassy Carbon Electrode through Electrochemical Method

2018 ◽  
Vol 4 (5) ◽  
pp. 560-563 ◽  
Author(s):  
R. Manikandan ◽  
A. Shoba ◽  
N. Senthil Kumar
Keyword(s):  
Glassy Carbon ◽  
Modified Glassy Carbon Electrode ◽  
Experimental Conditions ◽  
Peak Current ◽  
Force Microscopy ◽  
Atomic Force ◽  
Maximum Value ◽  
Diffusion Controlled ◽  
Relative Standard ◽  
Reverse Scan

The electrochemical studies of 4-nitrophenol were carried out in acidic, neutral and basic buffer media at bare glassy carbon (GC) and nanosize polyaniline (PANI) modified GC electrodes. In all pH, 4-nitrophenol exhibits three oxidation peaks in forward scan and three reduction peaks in reverse scan in the CV. The peak current reached its maximum value at pH 7.0. The effect of scan rate was studied between 25 and 500 mVs-1 at pH 7. CV results revealed the diffusion-controlled reaction at the electrode surface. The atomic force microscopy used for studies of morphological behavior of nanosize polyaniline and compound adsorbed on PANI surface. Under optimum DPSV experimental conditions, the influence of concentration on the stripping signal was studied A linear relationship between peak current and concentration is obtained in the range 100 to 500 ppb, with lower detection limit of 50 ppb on PANI/GCE. The relative standard deviation of 1.76% for a 250ppb 4-nitrophenol concentration and relative error of 2.6% were also obtained.

Effect of cetyltrimethylammonium bromide on the electrochemiluminiscence and electrooxidation of luminol

1983 ◽  
Vol 48 (2) ◽  
pp. 477-483 ◽  
Author(s):  
Jan Lasovský ◽  
František Grambal
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Linear Sweep Voltammetry ◽  
Critical Micellar Concentration ◽  
Peak Height ◽  
Anodic Peak ◽  
Alkaline Solutions ◽  
Platinum Electrodes ◽  
Micellar Solutions ◽  
Linear Sweep ◽  
Low Concentrations

The electrooxidation of luminol in alkaline solutions in the presence of cetyltrimethylammonium bromide (I) was studied by linear sweep voltammetry on fixed and vibrating platinum electrodes. The presence of I in low concentrations (below the critical micellar concentration) brings about aggregation of the luminol, which is manifested by an increase in the anodic peak height and its shift towards lower potentials. In micellar solutions the peak height decreases owing to the slower diffusion of the bulkier micelles, the shift to lower potentials being preserved. The light-voltage curves correspond with the voltammetric curves, exhibiting identical shifts of the peak potentials in dependence on the concentration of the surfactant.

Sign in / Sign up

Export Citation Format

Share Document