The integration of nanomaterials as electron mediators in electrochemical biosensors is taking on an essential role. Due to their high surface-to-volume ratio and conductivity, metallic nanowires are interesting option. In this paper, silver (AgNWs) were exploited design a novel catechol biosensor, the benefits increasing aspect mediator (nanowires vs. nanoparticles) analyzed. Atomic force microscopy (AFM) studies have shown homogeneous distribution enzyme along nanowires, maximizing contact...

Phenolic compounds such as catechol are present in a wide variety of foods and beverages; they great importance due to their antioxidant properties. This research presents the development sensitive biocompatible molecular imprinted sensor for electrochemical detection catechol, based on natural biopolymer-electroactive nanocomposites. Gold nanoparticle (AuNP)-decorated multiwalled carbon nanotubes (MWCNT) have been encapsulated polymeric chitosan (CS) matrix. nanocomposite has used develop...

Biosensor platforms consisting of layer by films combining materials with different functionalities have been developed and used to obtain improved catechol biosensors. Tyrosinase (Tyr) or laccase (Lac) were deposited onto LbL formed layers a cationic linker (chitosan, CHI) alternating anionic electrocatalytic (sulfonated copper phthalocyanine, CuPcS gold nanoparticles, AuNP). Films structures successfully formed. Characterization surface roughness porosity was carried out using AFM....

Abstract Medical implants manufactured using biomaterial Ti-6Al-4V exhibit some disadvantages. Its higher elastic modulus than that of natural bone can cause stress shielding problems. This be avoided with pores in the implant structure. However, poor corrosion and tribocorrosion behaviors are yielded because large area exposed to medium. To mitigate both issues, coating technologies applied. The plasma electrolytic oxidation (PEO) process is a cost-effective has been used successfully...

Porous titanium implants can be a good solution to solve the stress shielding phenomenon. However, presence of pores compromises mechanical and corrosion resistance. In this work, porous samples obtained using space-holder technique are coated with Chitosan, Chitosan/AgNPs Chitosan/Hydroxyapatite only one step an economic electrodeposition method. The coatings' topography, homogeneity chemical composition were analyzed. A study effect porosity type coating on resistance cellular behavior was...

A nanostructured electrochemical bi-sensor system for the analysis of milks has been developed using layer-by-layer technique. The non-enzymatic sensor [CHI+IL/CuPcS]₂, is a layered material containing negative film anionic sulfonated copper phthalocyanine (CuPcS) acting as electrocatalytic material, and cationic layer mixture an ionic liquid (IL) (1-butyl-3-methylimidazolium tetrafluoroborate) that enhances conductivity, chitosan (CHI), facilitates enzyme immobilization. biosensor...

A portable potentiometric electronic tongue (PE-tongue) was developed and applied to evaluate the quality of milk with different fat content (skimmed, semi-skimmed, whole) nutritional (classic, calcium-enriched, lactose-free, folic acid–enriched, enriched in sterols vegetal origin). The system consisted a simplified array five sensors based on PVC membranes, coupled data logger. were selected from larger set 20 by applying genetic algorithm (GA) responses compounds usually found including...

Recent advances in the field of electronic tongues (ET) are linked to development devices dedicated a particular application. Following this idea, we have developed voltammetric bioelectronic tongue (bioET) specifically analyze milk. The performance multisensor system has been improved by incorporating biosensors combining specific enzymes for detection sugars present milk (β-galactosidase, glucose oxidase and galactose oxidase) with silver nanomaterials. It demonstrated that nanowires...

Abstract BACKGROUND Electronic tongues have been widely used to analyze wines. However, owing the complexity of matrix, problem is not completely solved and further improvements are required. RESULTS A high‐performance potentiometric bioelectronic tongue (bio‐ET) specifically devoted assessment wine components presented. The novelty this system due two innovative approaches. First, improved performance obtained through use biosensors based on carboxylated polyvinyl chloride (PVC) membranes,...

A bio-electronic tongue has been developed to evaluate the phenolic content of grape residues (seeds and skins) in a fast easy way with industrial use mind. voltammetric electronic designed based on carbon resin electrodes modified tyrosinase combined electron mediators. The presence phenoloxydase promotes selectivity specificity towards phenols. results multivariate analysis allowed discriminating seeds skins according their polyphenolic content. Partial least squares (PLS) used establish...

The use of nanomaterials as electrode modifiers permits the enhancement performance using a great variety approaches, from electrocatalytic to improvement charge transfer processes. control and understanding interaction between itself are key importance for final modified electrode. This becomes especially relevant in case nanostructured materials since their physical response is rarely trivial. In this work, we combined electrochemistry atomic force microscopy (EC-AFM) in-situ investigate...

A new procedure to enhance the performance of polymer-based electrochemical sensors is proposed in this work. Polycaprolactone (PCL) electrospun fiber mats with tunable morphology are functionalized a conductive polymer (PEDOT:PSS) by facile dip-coting process, providing them necessary electrical conductivity work as sensors. The modification achieved an enhanced gas dissolution foaming procedure, environmentally friendly that employs CO2 blowing agent and takes advantage recent advances...

An alternative approach to analyze complex matrices, such as milk, lies on multivariate description of the chemical composition samples, where fingerprints for each sample are generated using data mining methods (Principal Component Analysis, PCA, and Supported Vector Machine). Electronic tongues (ET) hold substantial potential dairy industry analytical tools due their fast analysis. The purpose this work was create an impedimetric ET with array microelectrode sensors application in...

A nanostructured electrochemical bi-sensor system for analysis of milks has been developed using the Layer by technique. The non-enzymatic sensor [CHI+IL/CuPcS]2, is a layered material containing negative film anionic sulfonated copper phthalocyanine (CuPcS) acting as electrocatalytic material, and cationic layer mixture an ionic liquid (IL) (1-butyl-3-methylimidazolium tetrafluoroborate) that enhances conductivity chitosan (CHI) facilitates enzyme immobilization. biosensor...