scholarly journals Nanomaterials in Electrochemical Sensing Area: Applications and Challenges in Food Analysis

Molecules ◽  
2020 ◽  
Vol 25 (23) ◽  
pp. 5759
Author(s):  
Antonella Curulli
Keyword(s):  
Food Analysis ◽  
Electrochemical Sensors ◽  
Chemical Properties ◽  
Electrochemical Sensing ◽  
Morphological Properties ◽  
Sensitivity And Selectivity ◽  
Metallic Nanomaterials ◽  
Application Fields ◽  
Carbon Based Nanomaterials ◽  
Physical And Chemical

Recently, nanomaterials have received increasing attention due to their unique physical and chemical properties, which make them of considerable interest for applications in many fields, such as biotechnology, optics, electronics, and catalysis. The development of nanomaterials has proven fundamental for the development of smart electrochemical sensors to be used in different application fields such, as biomedical, environmental, and food analysis. In fact, they showed high performances in terms of sensitivity and selectivity. In this report, we present a survey of the application of different nanomaterials and nanocomposites with tailored morphological properties as sensing platforms for food analysis. Particular attention has been devoted to the sensors developed with nanomaterials such as carbon-based nanomaterials, metallic nanomaterials, and related nanocomposites. Finally, several examples of sensors for the detection of some analytes present in food and beverages, such as some hydroxycinnamic acids (caffeic acid, chlorogenic acid, and rosmarinic acid), caffeine (CAF), ascorbic acid (AA), and nitrite are reported and evidenced.

scholarly journals Carbonaceous Nanomaterials Employed in the Development of Electrochemical Sensors Based on Screen-Printing Technique—A Review

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 680 ◽  
Author(s):  
Alexandra Virginia Bounegru ◽  
Constantin Apetrei
Keyword(s):  
High Performance ◽  
Screen Printing ◽  
Electrochemical Sensors ◽  
Chemical Properties ◽  
Structural Features ◽  
Screen Printing Technique ◽  
Printing Technique ◽  
Carbon Based Nanomaterials ◽  
Physical And Chemical ◽  
Carbon Based

This paper aims to revise research on carbonaceous nanomaterials used in developing sensors. In general, nanomaterials are known to be useful in developing high-performance sensors due to their unique physical and chemical properties. Thus, descriptions were made for various structural features, properties, and manner of functionalization of carbon-based nanomaterials used in electrochemical sensors. Of the commonly used technologies in manufacturing electrochemical sensors, the screen-printing technique was described, highlighting the advantages of this type of device. In addition, an analysis was performed in point of the various applications of carbon-based nanomaterial sensors to detect analytes of interest in different sample types.

scholarly journals Zero→Two-Dimensional Metal Nanostructures: An Overview on Methods of Preparation, Characterization, Properties, and Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1895
Author(s):  
Ming Yang ◽  
Xiaohua Chen ◽  
Zidong Wang ◽  
Yuzhi Zhu ◽  
Shiwei Pan ◽  
...  
Keyword(s):  
Low Cost ◽  
Chemical Properties ◽  
Physical And Mechanical Properties ◽  
Characteristic Size ◽  
Metal Nanostructures ◽  
Physical Parameters ◽  
Preparation Methods ◽  
Composition And Structure ◽  
Application Fields ◽  
Physical And Chemical

Metal nanostructured materials, with many excellent and unique physical and mechanical properties compared to macroscopic bulk materials, have been widely used in the fields of electronics, bioimaging, sensing, photonics, biomimetic biology, information, and energy storage. It is worthy of noting that most of these applications require the use of nanostructured metals with specific controlled properties, which are significantly dependent on a series of physical parameters of its characteristic size, geometry, composition, and structure. Therefore, research on low-cost preparation of metal nanostructures and controlling of their characteristic sizes and geometric shapes are the keys to their development in different application fields. The preparation methods, physical and chemical properties, and application progress of metallic nanostructures are reviewed, and the methods for characterizing metal nanostructures are summarized. Finally, the future development of metallic nanostructure materials is explored.

scholarly journals Recent Advances in Electrochemical Sensors for the Detection of Biomolecules and Whole Cells

Biomedicines ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 15
Author(s):  
Intan Rosalina Suhito ◽  
Kyeong-Mo Koo ◽  
Tae-Hyung Kim
Keyword(s):  
Electrochemical Sensors ◽  
Metal Oxide Nanoparticles ◽  
Electrochemical Sensing ◽  
Critical Parameters ◽  
Label Free ◽  
Animal Cells ◽  
Whole Cells ◽  
Sensing Platforms ◽  
Sensitivity And Selectivity ◽  
Detection Of Biomolecules

Electrochemical sensors are considered an auspicious tool to detect biomolecules (e.g., DNA, proteins, and lipids), which are valuable sources for the early diagnosis of diseases and disorders. Advances in electrochemical sensing platforms have enabled the development of a new type of biosensor, enabling label-free, non-destructive detection of viability, function, and the genetic signature of whole cells. Numerous studies have attempted to enhance both the sensitivity and selectivity of electrochemical sensors, which are the most critical parameters for assessing sensor performance. Various nanomaterials, including metal nanoparticles, carbon nanotubes, graphene and its derivatives, and metal oxide nanoparticles, have been used to improve the electrical conductivity and electrocatalytic properties of working electrodes, increasing sensor sensitivity. Further modifications have been implemented to advance sensor platform selectivity and biocompatibility using biomaterials such as antibodies, aptamers, extracellular matrix (ECM) proteins, and peptide composites. This paper summarizes recent electrochemical sensors designed to detect target biomolecules and animal cells (cancer cells and stem cells). We hope that this review will inspire researchers to increase their efforts to accelerate biosensor progress—enabling a prosperous future in regenerative medicine and the biomedical industry.

scholarly journals Highlands of the upper Jequitinhonha valley, Brazil: I - characterization and classification

2011 ◽  
Vol 35 (4) ◽  
pp. 1069-1080 ◽  
Author(s):  
Fábio Henrique Alves Bispo ◽  
Alexandre Christofaro Silva ◽  
Pablo Vidal Torrado
Keyword(s):  
Drainage System ◽  
Chemical Properties ◽  
Morphological Properties ◽  
Texture Gradient ◽  
Physical And Chemical Properties ◽  
The Past ◽  
Massive Structure ◽  
Large Plane ◽  
Physical And Chemical ◽  
And Chemical Properties

In the upper Jequitinhonha valley, state of Minas Gerais, Brazi, there are large plane areas known as "chapadas", which are separated by areas dissected by tributaries of the Jequitinhonha and Araçuaí rivers. These dissected areas have a surface drainage system with tree, shrub, and grass vegetation, more commonly known as "veredas", i.e., palm swamps. The main purpose of this study was to characterize soil physical, chemical and morphological properties of a representative toposequence in the watershed of the Vereda Lagoa do Leandro, a swamp near Minas Novas, MG, on "chapadas", the highlands of the Alto Jequitinhonha region Different soil types are observed in the landscape: at the top - Typic Haplustox (LVA), in the middle slope - Xanthic Haplustox (LA), at the footslope - Xanthic Haplustox, gray color, here called "Gray Haplustox" ("LAC") and, at the bottom of the palm swamp - Typic Albaquult (GXbd). These soils were first morphologically described; samples of disturbed and undisturbed soils were collected from all horizons and subhorizons, to evaluate their essential physical and chemical properties, by means of standard determination of Fe, Al, Mn, Ti and Si oxides after sulfuric extraction. The contents of Fe, Al and Mn, extracted with dithionite-citrate-bicarbonate and oxalate treatments, were also determined. In the well-drained soils of the slope positions, the typical morphological, physical and chemical properties of Oxisols were found. The GXbd sample, from the bottom of the palm swamp, is grayish and has high texture gradient (B/A) and massive structure. The reduction of the proportion of crystalline iron compounds and the low crystallinity along the slope confirmed the loss of iron during pedogenesis, which is reflected in the current soil color. The Si and Al contents were lowest in the "LAC" soil. There was a decrease of the Fe2O3/TiO2 ratio downhill, indicating progressive drainage restriction along the toposequence. The genesis and all physical and chemical properties of the soils at the footslope and the bottom of the palm swamp of the "chapadas" of the Alto Jequitinhonha region are strongly influenced by the occurrence of ground water on the surface or near the surface all year long, at present and/or in the past. Total concentrations of iron oxides, Fe d and Fe o in soils of the toposequence studied are related to the past and/or present soil colors and drainage conditions.

ULTRAFINE AU NANODOTS ON GRAPHENE OXIDE FOR CATALYTIC REDUCTION OF 4-NITROPHENOL

NANO ◽  
2013 ◽  
Vol 08 (03) ◽  
pp. 1350034 ◽  
Author(s):  
JIANLI CHEN ◽  
GANG CHENG ◽  
ZHUANGNAN LI ◽  
FUJUN MIAO ◽  
XIAOQIANG CUI ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Catalytic Reduction ◽  
Synthesis Method ◽  
Chemical Properties ◽  
Electrochemical Sensing ◽  
Graphene Oxide Nanosheet ◽  
Average Size ◽  
Physical And Chemical ◽  
Au Nanodots

Graphene oxide nanosheet is an ideal platform to capture nanoparticles for highly efficient catalysis, electrochemical sensing and biosensing. In this work, we have described a simple synthesis method for preparation graphene oxide– Au nanohybrid. Au nanodots with an average size of 1.6 nm uniformly dispersed on the surface of graphene oxide. The well-defined nanostructure has been characterized by transmission electron microscopy (TEM) and atomic force microscopy (AFM). The nanohybrid also exhibits enhanced catalytic activity toward the reduction of 4-nitrophenol by NaBH4 . Comparing with pure Au nanodots and graphene oxide, graphene oxide– Au nanohybrid shows the highest catalytic activity. This approach not only suggests a wide potential application of graphene oxide nanosheet as a host material for supporting a variety of nanoparticles, but also provides a new approach for the fabrication of graphene-based nanohybrids with multiple physical and chemical properties.

scholarly journals Effect of nanocellulose polymorphism on electrochemical analytical performance in hybrid nanocomposites with non-oxidized single-walled carbon nanotubes

2022 ◽  
Vol 189 (2) ◽  
Author(s):  
Silvia Dortez ◽  
Tania Sierra ◽  
Miguel Á. Álvarez-Sánchez ◽  
José M. González-Domínguez ◽  
Ana M. Benito ◽  
...  
Keyword(s):  
Electrochemical Sensors ◽  
Critical Role ◽  
Active Surface ◽  
Analytical Performance ◽  
Electrochemical Sensing ◽  
Hybrid Nanocomposites ◽  
Type I ◽  
Single Walled Carbon ◽  
Sensitivity And Selectivity ◽  
Electrochemical Transducers

Abstract Two cellulose nanocrystals/single-walled carbon nanotube (CNC/SW) hybrids, using two cellulose polymorphs, were evaluated as electrochemical transducers: CNC type I (CNC-I/SW) and CNC type II (CNC-II/SW). They were synthesized and fully characterized, and their analytical performance as electrochemical sensors was carefully studied. In comparison with SWCNT-based and screen-printed carbon electrodes, CNC/SW sensors showed superior electroanalytical performance in terms of sensitivity and selectivity, not only in the detection of small metabolites (uric acid, dopamine, and tyrosine) but also in the detection of complex glycoproteins (alpha-1-acid glycoprotein (AGP)). More importantly, CNC-II/SW exhibited 20 times higher sensitivity than CNC-I/SW for AGP determination, yielding a LOD of 7 mg L−1.These results demonstrate the critical role played by nanocellulose polymorphism in the electrochemical performance of CNC/SW hybrid materials, opening new directions in the electrochemical sensing of these complex molecules. In general, these high-active-surface hybrids smartly exploited the preserved non-oxidized SW conductivity with the high aqueous dispersibility of the CNC, avoiding the use of organic solvents or the incorporation of toxic surfactants during their processing, making the CNC/SW hybrids promising nanomaterials for electrochemical detection following greener approaches. Graphical abstract

scholarly journals Morphogenetic features of properties of initial carbonate soils

2013 ◽  
pp. 324-332
Author(s):  
Roman Semashchuk
Keyword(s):  
Chemical Analysis ◽  
Key Words ◽  
Carbonate Rocks ◽  
Chemical Properties ◽  
Morphological Properties ◽  
Physical And Chemical Properties ◽  
Agricultural Plant ◽  
Physical Chemical ◽  
Physical And Chemical ◽  
And Chemical Properties

Results of studies of key morphological, physical-chemical and chemical properties of underdeveloped carbonate soils, which are influenced by woody, herbaceous and agricultural plant formations on eluvium-delluvium carbonate rocks, were given. Key words: initial soils, morphological properties, physical and chemical properties, gross chemical analysis.

scholarly journals Research Progress of Gas Sensing Performance of 2D Hexagonal WO3

2021 ◽  
Vol 9 ◽  
Author(s):  
Yueqi Li ◽  
Qin Zhou ◽  
Shoubing Ding ◽  
Zhimin Wu
Keyword(s):  
Gas Sensing ◽  
Low Cost ◽  
Chemical Properties ◽  
High Sensitivity ◽  
Oxide Semiconductor ◽  
Research Progress ◽  
Research Directions ◽  
Sensor Field ◽  
Sensitivity And Selectivity ◽  
Physical And Chemical

Metal oxide semiconductor gas sensing materials have attracted great research interest in the gas sensor field due to their outstanding physical and chemical properties, low cost, and easy preparation. Among them, two-dimensional hexagonal tungsten trioxide (2D h-WO3) is especially interesting because of its high sensitivity and selectivity to some gases. We firstly introduce the characteristics of 2D h-WO3 gas sensing materials and discuss the effects of microstructure, oxygen vacancy, and doping modification on the gas sensing properties of 2D h-WO3 mainly. Finally, we explore the application of 2D h-WO3 gas sensing materials and propose some research directions.

scholarly journals Decontamination of Surfaces Exposed to Carbon-Based Nanotubes and Nanomaterials

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Paul Su ◽  
Babak Haghpanah ◽  
William W. Doerr ◽  
Zahra Karimi ◽  
Syed Hassan ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Potential Method ◽  
Surface Reactivity ◽  
Multiwalled Carbon ◽  
Gradual Accumulation ◽  
Surface Decontamination ◽  
Carbon Based Nanomaterials ◽  
Physical And Chemical ◽  
Standard Techniques ◽  
Carbon Based

Contamination of surfaces by nanomaterials can happen due to accidental spillage and release or gradual accumulation during processing or handling. Considering the increasingly wide use of nanomaterials in industry and research labs and also taking into account the diversity of physical and chemical properties of different nanomaterials (such as solubility, aggregation/agglomeration, and surface reactivity), there is a pressing need to define reliable nanomaterial-specific decontamination guidelines. In this paper, we propose and investigate a potential method for surface decontamination of carbon-based nanomaterials using solvent cleaning and wipes. The results show that the removal efficiency for single- and multiwalled carbon nanotubes from silicon wafers sprayed with water-surfactant solutions prior to mechanical wiping is greater than 90% and 95%, respectively. The need for further studies to understand the mechanisms of nanomaterial removal from surfaces and development of standard techniques for surface decontamination of nanomaterials is highlighted.

Content System and Characteristics of Fabric Property

2011 ◽  
Vol 332-334 ◽  
pp. 787-790
Author(s):  
Rang Tong Liu ◽  
Feng Hua Liu ◽  
Yan Fei Yang
Keyword(s):  
Chemical Properties ◽  
Individual Property ◽  
Fabric Handle ◽  
Generic Term ◽  
Internal Structures ◽  
Content System ◽  
Set Up ◽  
Application Fields ◽  
And Function ◽  
Physical And Chemical

Content system and characteristics of fabric property is investigated in this paper. The connotation of fabric property is of diversity and colorful. Fabric property has its logical level, which can be primarily classified into basic physical and chemical properties (BPCP) and application derivative properties (ADP). According to experiences and practice that people applied fabric, several common integrated concepts (handle, luster, comfort and function) are set up. Fabric properties manifest in durability, aesthetics, permeability, fabric handle. Fabric property is a generic term of various characteristics and abilities of fabric, which is a kind of external reflections of internal structures of fabric. No matter what fabric it is, it possesses every property in content system. Fabric property depends on material and structure of fabric, and fabric of wool or cotton with plain or satin have differences on individual property. Content system of fabric property has the different measurement requirements to different application fields. The requirement to fabric property on different aspects of the same application is different on level.

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