Trace detection of thiols with Fourier transforms cyclic voltammetry technique in flowing solutions

Abstract

The present study reports an eco-friendly, biosynthesis of silver nanoparticles (AgNPs) using stem bark extract of Diospyros montana. Initially, the synthesis of AgNPs was confirmed by visual observation as color change. Further, the morphology of the biosynthesized nanoparticles, average size and presence of elemental silver were characterized by UV-Visible spectroscopy, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray and dynamic light scattering spectrometer. Qualitative phytochemical screening and FTIR spectral peaks supported the role of phytochemicals in bark extract for the metal reduction, stabilization and capping of silver nanoparticles. XRD studies demonstrated that crystalline nature and their average size of nanoparticles was 28 nm as determined by Scherrer's formula. The antioxidant ability of AgNPs and plant extract was analyzed using DPPH and Hydrogen peroxide assay. The percentage of DPPH and H 2 O 2 activity was increased with increasing concentration of AgNPs. In vitro antibacterial effect of various concentration of AgNPs was investigated against both Gram positive (B.subtilis and S.aureus) and Gram negative (E.coli and K.aerogenes) bacterial strains. The result shows that biosynthesized AgNPs have significant antibacterial activity.

On-line monitoring of odorant in natural gas mixtures of different composition by the infrared absorption spectroscopy method

“…As has been noted in a number of previous publications, the problem of measuring the content of sulfur compounds in gaseous and liquid media is of great importance [1][2][3][4][5][6]. The presence of these substances in petroleum products leads to more rapid equipment wear due to its corrosive effect and to environmental pollution during fuel combustion.…”

Optical on-line method of ethyl mercaptan detection in liquid phase in motor fuels

“…The methods can be divided into three groups: Those based on sulfur oxidation and the consequent measuring of forming oxides, those based on reducing sulfur to hydrogen sulfide, and the measurement of its concentration and methods based on spectral analysis. The latter can be divided into those of atomic emission and x-ray spectroscopy [2][3][4][5][6][7][8][9].…”

A Nanostructure Based Electrochemical Sensor for Square Wave Voltammetric Determination of L‐Cysteine in the Presence of High Concentration of Folic Acid

“…Generally,t he determination of Cys is carried out by various methods,i ncluding chromatography [2-4], electrophoresis [5],s pectrophotometry [6-9],a nd chemiluminescence [10].C ys can be studied also via electrochemical techniques [11][12][13][14].Combination of Cys and FA are effective against signs of aging and also Cys is effective on the FA conjugation [12].S o, simultaneous determination of thesec ompounds is very important in biological samples.T ot he best of our knowledge,o nly one published paper has been reported on the voltammetric determination of Cysi nt he presence of FA using modified electrodes [12],w hich is the focus of the present study.C ompared with previous report, the sensor usedi nt his study has an excellent dynamic range and limit of detection for the Cysa nalysis in the simultaneous determination of Cys and FA.Compared with otherk ind of sensors,e lectrochemical sensors have manya dvantages.F or example,t he electrodes can sense the materials whicha re present within the host without doinga ny damage to the host system [15][16][17][18][19][20][21][22][23][24].O nt he other hand, the active sensing material on the electrode should act as ac atalyst and catalyze the reaction of the biochemical or food electroactive compounds to obtain the output signals [25,26].T he selection and de-velopment of an active material in electrochemical studies is an important issue.T he actives ensingm aterials maybe of any kind as whichever acts as ac atalyst for sensing ap articular analyte or as et of analytes.T he recent improvement in the nanoscience has paved the way for large number of new materials and devices of desirable properties whichh ave useful functions for numerous electrochemical sensors and biosensor applications [27][28][29].In this research, we have used cyclic voltammetry, linear sweep voltammetry (LSV), chronoamperometry and SWV as voltammetric techniques for electrochemical determinationo fC ys on the DMBQ/ZnO/NPs/CPE at pH 5.0. l-Cys is built directly from l-methionin as an essential aminoacid making its abundance in the body acritical factor to the bodys supply of l-cysteine.…”

“…Compared with otherk ind of sensors,e lectrochemical sensors have manya dvantages.F or example,t he electrodes can sense the materials whicha re present within the host without doinga ny damage to the host system [15][16][17][18][19][20][21][22][23][24].O nt he other hand, the active sensing material on the electrode should act as ac atalyst and catalyze the reaction of the biochemical or food electroactive compounds to obtain the output signals [25,26].T he selection and de-velopment of an active material in electrochemical studies is an important issue.T he actives ensingm aterials maybe of any kind as whichever acts as ac atalyst for sensing ap articular analyte or as et of analytes.T he recent improvement in the nanoscience has paved the way for large number of new materials and devices of desirable properties whichh ave useful functions for numerous electrochemical sensors and biosensor applications [27][28][29].…”