Determination of anionic surfactants in real samples using a low-cost and high sensitive solid contact surfactant sensor with MWCNTs as the ion-to-electron transducer

2017 ◽  
Vol 9 (15) ◽  
pp. 2305-2314 ◽  
Author(s):  
Nikola Sakač ◽  
Maja Karnaš ◽  
Marija Jozanović ◽  
Martina Medvidović-Kosanović ◽  
Sanja Martinez ◽  
...  
Keyword(s):  
Anionic Surfactants ◽  
Low Cost ◽  
Fast Response ◽  
Solid Contact ◽  
Real Samples ◽  
Long Life ◽  
Pencil Lead

Long-life, low-cost and fast-response graphite pencil lead surfactant sensors based on MWCNTs.

scholarly journals Applicability of Cork as Novel Modifiers to Develop Electrochemical Sensor for Caffeine Determination

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 37
Author(s):  
Mayra K. S. Monteiro ◽  
Djalma R. Da Silva ◽  
Marco A. Quiroz ◽  
Vítor J. P. Vilar ◽  
Carlos A. Martínez-Huitle ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Linear Response ◽  
High Performance ◽  
Low Cost ◽  
Pharmaceutical Formulations ◽  
Caffeine Concentration ◽  
Real Samples ◽  
Wide Range ◽  
Potential Use

This study aims to investigate the applicability of a hybrid electrochemical sensor composed of cork and graphite (Gr) for detecting caffeine in aqueous solutions. Raw cork (RAC) and regranulated cork (RGC, obtained by thermal treatment of RAC with steam at 380 °C) were tested as modifiers. The results clearly showed that the cork-graphite sensors, GrRAC and GrRGC, exhibited a linear response over a wide range of caffeine concentration (5–1000 µM), with R2 of 0.99 and 0.98, respectively. The limits of detection (LOD), estimated at 2.9 and 6.1 µM for GrRAC and GrRGC, suggest greater sensitivity and reproducibility than the unmodified conventional graphite sensor. The low-cost cork-graphite sensors were successfully applied in the determination of caffeine in soft drinks and pharmaceutical formulations, presenting well-defined current signals when analyzing real samples. When comparing electrochemical determinations and high performance liquid chromatography measurements, no significant differences were observed (mean accuracy 3.0%), highlighting the potential use of these sensors to determine caffeine in different samples.

scholarly journals Cobalt(II) ion-selective electrode with solid contact

2008 ◽  
Vol 6 (4) ◽  
pp. 607-612 ◽  
Author(s):  
Cecylia Wardak
Keyword(s):  
Detection Limit ◽  
Response Time ◽  
Potentiometric Titration ◽  
Indicator Electrode ◽  
Solid Contact ◽  
Selective Electrode ◽  
Cobalt Ions ◽  
Real Samples ◽  
Nernstian Slope

AbstractA new all plastic sensor for Co2+ ions based on 2-amino-5 (hydroxynaphtyloazo-1′)-1,3,4 thiadiazole (ATIDAN) as ionophore was prepared. The electrode exhibits a low detection limit of 1.5 × 10−6 mol L−1 and almost theoretical Nernstian slope in the activity range 4.0 × 10−6–1 × 10−1 mol L−1 of cobalt ions. The response time of the sensor is less than 10 s and it can be used over a period of 6 months without any measurable divergence in potential. The proposed sensor shows a fairly good selectivity for Co(II) over other metal ions. The electrode was successfully applied for determination of Co2+ in real samples and as an indicator electrode in potentiometric titration of Co2+ ions with EDTA.

A new graphene-based surfactant sensor for the determination of anionic surfactants in real samples

2016 ◽  
Vol 236 ◽  
pp. 257-267 ◽  
Author(s):  
Olivera Galović ◽  
Mirela Samardžić ◽  
Mateja Hajduković ◽  
Milan Sak-Bosnar
Keyword(s):  
Anionic Surfactants ◽  
Real Samples

Optimization of a Spectrophotometric Flow Injection

2020 ◽  
pp. 175-203
Author(s):  
Germán Adán Sánchez Gallegos ◽  
Maria del Pilar Haro Vazquez ◽  
José Manuel Cornejo-Bravo ◽  
Eugenia Gabriela Carrillo-Cedillo
Keyword(s):  
Low Cost ◽  
Flow Cell ◽  
Physical Parameters ◽  
Factorial Designs ◽  
Sample Material ◽  
Real Samples ◽  
Straightforward Application ◽  
Liquid Samples ◽  
Determination Of Copper

This chapter presents the optimization of the hydrodynamic and chemical parameters of the FIA system in the determination of copper and manganese in wine samples by VIS spectrophotometry. This technique has been based on the injection of liquid samples in the non-segmented movement, within a continuous carrier current of a suitable liquid. The injected sample forms a zone that disperses on its way to a detector. The later continuously records the absorbance or other physical parameters, since it continuously passes the sample material through the flow cell, using the factorial designs Plackett-Burman, Box-Behnken, and the factorial design 2^4. The methods have the advantages of low-cost, easy availability of chemicals, and instrumentation and straightforward application to real samples.

A New Sensor for Determination of Anionic Surfactants in Detergent Products with Carbon Nanotubes as Solid Contact

2017 ◽  
Vol 20 (4) ◽  
pp. 881-889 ◽  
Author(s):  
Nikola Sakač ◽  
Marija Jozanović ◽  
Maja Karnaš ◽  
Milan Sak-Bosnar
Keyword(s):  
Carbon Nanotubes ◽  
Anionic Surfactants ◽  
Solid Contact

scholarly journals Determination of PV GeneratorI-V/P-VCharacteristic Curves Using a DC-DC Converter Controlled by a Virtual Instrument

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
E. Durán ◽  
J. M. Andújar ◽  
J. M. Enrique ◽  
J. M. Pérez-Oria
Keyword(s):  
Measurement System ◽  
Virtual Instrument ◽  
High Speed ◽  
Low Cost ◽  
Fast Response ◽  
Prototype System ◽  
System Control ◽  
Systematic Testing ◽  
Testing And Measurement

A versatile measurement system for systematic testing and measurement of the evolution of theI-Vcharacteristic curves of photovoltaic panels or arrays (PV generators) is proposed in this paper. The measurement system uses a circuit solution based on DC-DC converters that involves several advantages relative to traditional methods: simple structure, scalability, fast response, and low cost. The measurement of the desired characteristics of PV generators includes high speed of response and high fidelity. The prototype system built is governed by a microcontroller, and experimental results prove the proposed measurement system useful. A virtual instrument (VI) was developed for full system control from a computer. The developed system enables monitoring the suitable operation of a PV generator in real time, since it allows comparing its actual curves with those provided by the manufacturer.

scholarly journals Ultrasensitive Electrochemical Sensor for Luteolin Based on Zirconium Metal-Organic Framework UiO-66/Reduced Graphene Oxide Composite Modified Glass Carbon Electrode

Molecules ◽  
2020 ◽  
Vol 25 (19) ◽  
pp. 4557 ◽  
Author(s):  
Qian Wang ◽  
Chunmeng Gu ◽  
Yafen Fu ◽  
Liangliang Liu ◽  
Yixi Xie
Keyword(s):  
Graphene Oxide ◽  
Fruits And Vegetables ◽  
Low Cost ◽  
Metal Organic Framework ◽  
Fast Response ◽  
Electrochemical Sensing ◽  
Carbon Electrode ◽  
Factors Affecting ◽  
Real Samples ◽  
Glass Carbon Electrode

Luteolin is a kind of natural flavonoid with many bioactivities purified from a variety of natural herbs, fruits and vegetables. Electrochemical sensing has become an outstanding technology for the detection of luteolin in low concentration due to its fast response, easy operation and low cost. In this study, electroreduced graphene oxide (ErGO) and UiO-66 were successively modified onto a glassy carbon electrode (UiO-66/ErGO/GCE) and applied to the detection of luteolin. A combination of UiO-66 and ErGO showed the highest promotion in the oxidation peak current for luteolin compared with those of a single component. The factors affecting the electrochemical behavior of UiO-66/ErGO/GCE were evaluated and optimized including pH, accumulation potential, accumulation time and scan rate. Under optimum conditions, UiO-66/ErGO/GCE showed satisfactory linearity (from 0.001 μM to 20 μM), reproducibility and storage stability. The detection limit of UiO-66/ErGO/GCE reached 0.75 nM of luteolin and was suitable for testing real samples. Stable detection could be provided at least eight times by one modified electrode, which guaranteed the practicability of the proposed sensor. The fabricated UiO-66/ErGO/GCE showed a rapid electrochemical response and low consumption of materials in the detection of luteolin. It also showed satisfactory accuracy for real samples with good recovery. In conclusion, the modification using MOFs and graphene materials made the electrode advanced property in electrochemical sensing of natural active compounds.

scholarly journals PEMERIKSAAN KLINIK BERBASIS BIOSENSOR BAGIAN 2: Biosensor Virus Untuk Deteksi Penyakit Patogen

2016 ◽  
Vol 4 (2) ◽  
Author(s):  
NUR HABIBAH
Keyword(s):  
Electrochemical Biosensor ◽  
Rapid Determination ◽  
Low Cost ◽  
Virus Detection ◽  
Fast Response ◽  
Human Pathogen ◽  
Biosensor Technology ◽  
Delay Of Diagnosis ◽  
Clinical Determination

Nowadays, rapid determination of several viruses which caused pathogen diseases is really important. Most of rapid detection of human pathogen viruses was developed by using biosensor technology. Biosensor technology offers several advantages, such as simple, efficient, low cost, fast response, easy to operate, and reliable. Viral detection by using biosensor can also avoid the delay of diagnosis, so the doctor can determine the type of drugs quickly and also can decide the type of patient care, properly. Most of biosensor for virus detection was exploited by using electrochemical principle, with amperometric and volumetric transducer. Almost of virus biosensor used immobilized antibody onto electrode surface as a biorecognition element. Some of viruses that could be detected by using electrochemical biosensor are HCV, HBV, HIV and influenza virus. However, quality control of the biosensor result is important, so the biosensor could be selected as an alternative method for on-site determination, especially in clinical determination. Keywords: biosensor, virus biosensor, virus detection, pathogen diseases detection

Nanomaterial LaNiTiO3-Fe3O4-based peroxidase biomimetic sensor with high sensitivity

2020 ◽  
Vol 16 ◽  
Author(s):  
Yanhong Xu ◽  
Ying Sun ◽  
Qiao Feng
Keyword(s):  
Detection Limit ◽  
Low Cost ◽  
Supporting Electrolyte ◽  
High Sensitivity ◽  
Fast Response ◽  
H2o2 Concentration ◽  
Current Time ◽  
Real Samples ◽  
Wide Range ◽  
Biomimetic Sensor

Background: Hydrogen peroxide (H2O2) is widely present in various fields. And H2O2 plays quintessential role in variety of biomolecular processes. H2O2 concentration level is an essential biological parameter in monitoring and maintaining the physiological balance of a living cell, and its variation will cause some related diseases. Therefore, it is extremely significant to fabricate biosensor with low cost which can quickly, accurately and sensitively detect H2O2 in a wide range. The aims of this paper are to explore a novel electrochemical sensor with high intrinsic peroxidase-like activity, high sensitivity and stability to detect effectively H2O2 concentration in real samples. Methods: The chemical modified electrode LaNiTiO3-Fe3O4/GCE is fabricated based on nanomaterial LaNiTiO3-Fe3O4 by simply process, and its electrochemical properties are investigated in the supporting electrolyte of 0.1 M NaOH by the techniques of cyclic voltammetry and current-time curves on an electrochemical workstation with a conventional threeelectrode system. Results: LaNiTiO3-Fe3O4 nanoparticles show good peroxidase-like activity for H2O2 at a low applied potential of +0.50 V. Under the optimum conditions, the peroxidase biomimetic sensor LaNiTiO3-Fe3O4/GCE exhibits a wide linear response for H2O2 oxidation in the range of 0.05 μM - 3.0 mM (R = 0.9994) with a high sensitivity of 3946.2 μA∙mM1 ∙cm-2 and fast response time of 2 s, and the detection limit of H2O2 is found to be ca. 5.15 nM (S/N = 3). Moreover, the biosensor presents a good repeatability, stability and anti-interference. Satisfactory results were obtained when the sensor LaNiTiO3-Fe3O4/GCE is applied to determine H2O2 in real samples. All of these results provide support to practical application. Conclusion: A highly sensitive peroxidase biomimetic sensor based on LaNiTiO3-Fe3O4 with nano-scaled material is successfully explored, and shows good activity for H2O2. The proposed biosensor with simple and low cost has exhibited excellent advantages of quick response, wide linear range, low detection limit, high sensitivity, long-term stability and good anti-interference ability, which provides promising applications.

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