scholarly journals Analytical Parameters of a Novel Glucose Biosensor Based on Grafted PFM as a Covalent Immobilization Technique

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4185
Author(s):  
Margalida Artigues ◽  
Joan Gilabert-Porres ◽  
Robert Texidó ◽  
Salvador Borrós ◽  
Jordi Abellà ◽  
...  
Keyword(s):  
Low Cost ◽  
Fast Response ◽  
Food Samples ◽  
Glucose Biosensor ◽  
Covalent Immobilization ◽  
Long Term Stability ◽  
Industrial Sectors ◽  
Initial Sensitivity ◽  
Enzyme Molecules

Bioanalytical methods, in particular electrochemical biosensors, are increasingly used in different industrial sectors due to their simplicity, low cost, and fast response. However, to be able to reliably use this type of device, it is necessary to undertake in-depth evaluation of their fundamental analytical parameters. In this work, analytical parameters of an amperometric biosensor based on covalent immobilization of glucose oxidase (GOx) were evaluated. GOx was immobilized using plasma-grafted pentafluorophenyl methacrylate (pgPFM) as an anchor onto a tailored HEMA-co-EGDA hydrogel that coats a titanium dioxide nanotubes array (TiO2NTAs). Finally, chitosan was used to protect the enzyme molecules. The biosensor offered outstanding analytical parameters: repeatability (RSD = 1.7%), reproducibility (RSD = 1.3%), accuracy (deviation = 4.8%), and robustness (RSD = 2.4%). In addition, the Ti/TiO2NTAs/ppHEMA-co-EGDA/pgPFM/GOx/Chitosan biosensor showed good long-term stability; after 20 days, it retained 89% of its initial sensitivity. Finally, glucose concentrations of different food samples were measured and compared using an official standard method (HPLC). Deviation was lower than 10% in all measured samples. Therefore, the developed biosensor can be considered to be a reliable analytical tool for quantification measurements.

A deuterium-palladium electrode as a new sensor in non-aqueous solutions: potentiometric titration of weak acids in acetonitrile and benzonitrile

2010 ◽  
Vol 64 (5) ◽  
Author(s):  
Ivan Pantić ◽  
Ranđel Mihajlović ◽  
Ljiljana Mihajlović
Keyword(s):  
Potassium Hydroxide ◽  
Low Cost ◽  
Sodium Methylate ◽  
Fast Response ◽  
Indicator Electrode ◽  
Weak Acids ◽  
Palladium Electrode ◽  
Long Term Stability ◽  
Nernstian Slope

AbstractA deuterium-palladium electrode was employed as a new indicator electrode for the titration of weak acids in acetonitrile and benzonitrile. The investigated electrode showed a linear dynamic response for p-toluenesulfonic acid in the concentration range from 0.001 M to 0.1 M with a Nernstian slope of 48 mV in acetonitrile. Sodium methylate, potassium hydroxide and tetrabutylammonium hydroxide proved to be very suitable titrating agents for these titrations. The response time was less than 10-11 s and the lifetime of the electrode was limitless. Advantages of the electrode are: long-term stability, fast response, reproducibility, easy preparation and low cost.

scholarly journals Wittichenite semiconductor of Cu3BiS3 films for efficient hydrogen evolution from solar driven photoelectrochemical water splitting

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Dingwang Huang ◽  
Lintao Li ◽  
Kang Wang ◽  
Yan Li ◽  
Kuang Feng ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Low Cost ◽  
Solar Hydrogen ◽  
Onset Potential ◽  
Term Stability ◽  
Long Term Stability ◽  
Solar Water Splitting ◽  
Current Densities

AbstractA highly efficient, low-cost and environmentally friendly photocathode with long-term stability is the goal of practical solar hydrogen evolution applications. Here, we found that the Cu3BiS3 film-based photocathode meets the abovementioned requirements. The Cu3BiS3-based photocathode presents a remarkable onset potential over 0.9 VRHE with excellent photoelectrochemical current densities (~7 mA/cm2 under 0 VRHE) and appreciable 10-hour long-term stability in neutral water solutions. This high onset potential of the Cu3BiS3-based photocathode directly results in a good unbiased operating photocurrent of ~1.6 mA/cm2 assisted by the BiVO4 photoanode. A tandem device of Cu3BiS3-BiVO4 with an unbiased solar-to-hydrogen conversion efficiency of 2.04% is presented. This tandem device also presents high stability over 20 hours. Ultimately, a 5 × 5 cm2 large Cu3BiS3-BiVO4 tandem device module is fabricated for standalone overall solar water splitting with a long-term stability of 60 hours.

High-performance humidity sensors from Ni(SO4)0.3(OH)1.4 nanobelts

Nanoscale ◽  
2014 ◽  
Vol 6 (12) ◽  
pp. 6521-6525 ◽  
Author(s):  
Ming Zhuo ◽  
Yuejiao Chen ◽  
Tao Fu ◽  
Haonan Zhang ◽  
Zhi Xu ◽  
...  
Keyword(s):  
High Performance ◽  
Humidity Sensor ◽  
High Sensitivity ◽  
Fast Response ◽  
Humidity Sensors ◽  
Term Stability ◽  
Long Term Stability

Ni(SO4)0.3(OH)1.4 nanobelts are utilized in a humidity sensor by a facile method. The nanobelt based sensor shows a high sensitivity, fast response and long-term stability in the sensing process.

scholarly journals Graphene-Based Wearable Electrochemical Glucose Biosensor: A Review

2018 ◽  
Vol 7 (3.14) ◽  
pp. 250 ◽  
Author(s):  
Siti Musliha Ajmal Mokhtar ◽  
Mastura Omar ◽  
Zahari Abu Bakar ◽  
Yusmeeraz Yusof ◽  
Zairi Ismael Rizman ◽  
...  
Keyword(s):  
Electronic Device ◽  
Fast Response ◽  
Glucose Biosensor ◽  
Key Factors ◽  
Non Invasive ◽  
Wearable Electronic Device ◽  
Recent Advancement ◽  
Wearable Electronic ◽  
Insight Into

An overview of recent advancement in wearable glucose biosensor has been reviewed. The large sensing area, superior conductivity and high tensile strength has become key factors of graphene as material for flexible and wearable electronic device. This review discusses development and challenges based on graphene and its related materials of recent electrochemical glucose biosensor towards fast response, good selectivity, superb reproducibility and outstanding flexibility. A details comparison in terms of sensitivities, low detection limits and long-term stabilities are included. This review will also provide new insight into invasive and non-invasive methods as future prospect of wearable glucose biosensor.

The Research about La0.8Sr0.2CoO3 Application as Dense Diffusion Barrier in Limiting Current Oxygen Sensors

2013 ◽  
Vol 703 ◽  
pp. 111-114
Author(s):  
Yin Lin Wu ◽  
Hai Yan Zhao ◽  
Fu Shen Li
Keyword(s):  
Diffusion Barrier ◽  
Solid Electrolytes ◽  
Oxygen Sensor ◽  
Low Cost ◽  
Limiting Current ◽  
Stabilized Zirconia ◽  
Long Term Stability ◽  
Oxygen Ion ◽  
Ion Conducting

The fabrication and operation of a new thick film type of limiting current oxygen sensor is demonstrated that utilizes yttria (8% mol) stabilized zirconia (YSZ) as oxygen ion conducting solid electrolytes and dense La0.8Sr0.2CoO3(LSC) as diffusion barrier. The oxygen sensor shows a near linear response between 0 to 10.5% O2in argon at 1023K. The advantages of the sensor are simple construction, low cost and potential long term stability.

High performance electrochromic devices based on a polyindole derivative, poly(1H-benzo[g]indole)

2015 ◽  
Vol 3 (43) ◽  
pp. 11318-11325 ◽  
Author(s):  
Guangming Nie ◽  
Ling Wang ◽  
Changlong Liu
Keyword(s):  
Response Time ◽  
High Performance ◽  
Optical Memory ◽  
Fast Response ◽  
Electrochromic Devices ◽  
Optical Contrast ◽  
Fast Response Time ◽  
Coloration Efficiency ◽  
Long Term Stability

An ECD based on electrochromic poly(1H-benzo[g]indole) was fabricated. The color of this ECD can switch between green and navy blue with good optical contrast, high coloration efficiency, fast response time, better optical memory and long-term stability.

Limiting Current Oxygen Sensors with LSM as Dense Diffusion Barrier

2008 ◽  
Vol 368-372 ◽  
pp. 263-264
Author(s):  
Yin Lin Wu ◽  
Ling Wang ◽  
Fu Shen Li ◽  
Yan Qin Zhao
Keyword(s):  
Diffusion Barrier ◽  
Solid Electrolytes ◽  
Oxygen Sensor ◽  
Low Cost ◽  
Limiting Current ◽  
Excellent Performance ◽  
Long Term Stability ◽  
Oxygen Ion ◽  
Ion Conducting

A thick film type of limiting current oxygen sensor which uses yttria (8% mol) stabilized zirconia (YSZ) as oxygen ion conducting solid electrolytes and dense La0.8Sr0.2MnO3 (LSM) as diffusion barrier was developed successfully. The oxygen sensor showed excellent performance at oxygen concentrations ranging from 0 to 10 ppm. The advantages of the sensor are simple construction, low cost and potential long term stability.

scholarly journals Self-Healable Organic Electrochemical Transistor with High Transconductance, Fast Response, and Long-Term Stability

2020 ◽  
Vol 12 (30) ◽  
pp. 33979-33988
Author(s):  
Jieun Ko ◽  
Xihu Wu ◽  
Abhijith Surendran ◽  
Bening Tirta Muhammad ◽  
Wei Lin Leong
Keyword(s):  
Fast Response ◽  
Term Stability ◽  
Long Term Stability ◽  
Electrochemical Transistor ◽  
High Transconductance

scholarly journals Fabrication of Superhydrophobic Magnetic Sawdust as Effective and Recyclable Oil Sorbents

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3432
Author(s):  
Shumin Fan ◽  
Shuai Pei ◽  
Tianyu Shen ◽  
Guangri Xu ◽  
Yuanchao Li ◽  
...  
Keyword(s):  
Low Cost ◽  
Absorption Capacity ◽  
Magnetic Characteristics ◽  
Formaldehyde Resin ◽  
Water Contact ◽  
Long Term Stability ◽  
Oil Sorbent ◽  
Oil In Water ◽  
Oil Absorbent

In this paper, a novel superhydrophobic magnetic sawdust (SMSD) was fabricated as an oil sorbent. The SMSD was functionalized with Fe3O4 nanoparticles using melamine formaldehyde resin (MFR) as a coupling agent and subsequently hydrophobically-treated with hexadecyltrimethoxysilane (HDTMS). The SMSD showed excellent superhydrophobicity with the water contact angle of 155.3 ± 0.9°. Meanwhile it had remarkable environmental durability, long-term stability, and mechanical durable properties. Taking advantage of its magnetic characteristics, the SMSD could be easily controlled to absorb oil to separate oil–water mixtures with high oil absorption capacity and good reusability. Moreover, the emulsion was successfully separated by SMSD, including water-in-oil and oil-in-water emulsions. This study developed an effective oil absorbent, which was low cost and environmentally-friendly.

scholarly journals A Non-Enzymatic Sensor Based on Fc-CHIT/CNT@Cu Nanohybrids for Electrochemical Detection of Glucose

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2419
Author(s):  
Fang Wang ◽  
Sheng Hu ◽  
Fengna Shi ◽  
Kexin Huang ◽  
Jiarui Li
Keyword(s):  
Electrochemical Impedance ◽  
Glucose Biosensor ◽  
Glucose Detection ◽  
Synergy Effect ◽  
Cu Nanoparticles ◽  
Long Term Stability ◽  
Linear Detection ◽  
Glucose Sensitivity ◽  
Glucose Biosensing

Herein, a composite structure, consisting of Cu nanoparticles (NPs) deposited onto carbon nanotubes and modified with ferrocene-branched chitosan, was prepared in order to develop a nonenzymatic electrochemical glucose biosensor ferrocene-chitosan/carbon nanotube@ Cu (Fc-CHIT/CNT@Cu). The elemental composition of the carbon nanohybrids, morphology and structure were characterized by various techniques. Electrochemical impedance spectroscopy (EIS) was used to study the interfacial properties of the electrodes. Cyclic voltammetry (CV) and chronoamperometry methods in alkaline solution were used to determine glucose biosensing properties. The synergy effect of Cu NPs and Fc on current responses of the developed electrode resulted in good glucose sensitivity, including broad linear detection between 0.2 mM and 22 mM, a low detection limit of 13.52 μM and sensitivity of 1.256 μA mM−1cm−2. Moreover, the modified electrode possessed long-term stability and good selectivity in the presence of ascorbic acid, dopamine and uric acid. The results indicated that this inexpensive electrode had potential application for non-enzymatic electrochemical glucose detection.

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