Rosanna Toniolo

Rosanna Toniolo
University of Udine | UNIUD

About

86
Publications
5,303
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1,976
Citations
Citations since 2016
36 Research Items
1047 Citations
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200

Publications

Publications (86)
Article
Full-text available
Cow’s milk allergy is one of the most common food allergies in children with a prevalence of around 2.5%. Milk contains several allergens; the main ones are caseins and β-lactoglobulin (β-LG). At regulatory level, β-LG is not explicitly named, but milk is included in the list of substances or products causing allergies or intolerances. Hence, the p...
Article
In saltmarsh soils, humic acids (HA) are involved in geochemically important redox processes. The electron donating capacity (EDC) of HA depends on their molecular structure, but also reflects the intensity of biological reduction in tidal environments. We examined twelve soils in three saltmarshes located along a geographical gradient and applied...
Article
A low-cost portable analytical device, suitable for performing reflectance measurements on paper supports is proposed. It consists of a simple module consisting of a matrix of six types of photodiodes (six channels) with maximum sensitivity at six different wavelengths in the visible region. The device was used in combination with paper-based analy...
Article
A screen printed electrode modified for gas phase measurements is used for analyzing the ethanol content in alcoholic drinks. It consists in the application of a paper crown, soaked with the room temperature ionic liquid (RTIL) 1‐butyl‐3‐methylimidazolium hydrogen sulfate, upon a screen printed cell contacting the outer edge of the gold disc workin...
Article
Full-text available
Nanomaterials can be used to modify electrodes and improve the conductivity and the performance of electrochemical sensors. Among various nanomaterials, gold-based nanostructures have been used as an anchoring platform for the functionalization of biosensor surfaces. One of the main advantages of using gold for the modification of electrodes is its...
Article
Full-text available
Exposure to oxygen and aerobic biological activity during drought periods alters the availability of terminal electron acceptors (TEA) in the peat catotelm layer. We investigated the changes in the electrochemical and chemical characteristics of humic acids (HA) induced by subjecting air-dried sphagnum peat to biological oxidation or reduction duri...
Article
Full-text available
Paper has been widely employed as cheap material for the development of a great number of sensors such as pregnancy tests, strips to measure blood sugar, and COVID-19 rapid tests. The need for new low-cost analytical devices is growing, and consequently the use of these platforms will be extended to different assays, both for the final consumer and...
Article
Humic substances (HS) possess redox active groups covering a wide range of potentials and are used by facultative anaerobic microorganisms as electron acceptors. To serve as suitable electron shuttles for anaerobic respiration, HS should be able to re-oxidize relatively quickly to prevent polarization of the surrounding medium. Mediated electrochem...
Article
This investigation was carried out with the aim of verifying whether transmittance detection modes on soaked paper, which is a simple and attractive determination approach for microfluidic paper-based analytical devices, can be improved by using deep eutectic solvents (DESs) as suitable media for minimizing reflection and refraction phenomena affec...
Article
Full-text available
Deep Eutectic Solvents (DESs) are a new class of solvents characterized by a remarkable decrease in melting point compared to those of the starting components. The eutectic mixtures can be simply prepared by mixing a Hydrogen Bond Acceptor (HBA) with a Hydrogen Bond Donor (HBD) at a temperature of about 80 • C. They have found applications in diffe...
Article
Full-text available
A voltammetric and scanning electrochemical microscopy (SECM) investigation was performed on an inherently chiral oligomer-coated gold electrode to establish its general properties (i.e., conductivity and topography), as well as its ability to discriminate chiral electroactive probe molecules. The electroactive monomer (S)-2,2-bis(2,2-bithiophene-5...
Article
Malondialdehyde (MDA) is a mutagenic secondary product of the peroxidation of polyunsaturated fatty acids, often used as a target for the food oxidation state, whose determination is frequently performed by its slow reaction with thiobarbituric acid (TBA), dissolved in acidified aqueous-ethanol medium, to produce a pink colored MDA-TBA adduct. In t...
Article
This investigation was carried out with the aim of stressing that technologically-advanced systems can be prototyped and produced by using 3D printing and inexpensive electronic modules. In particular, open-source technologies are opening new exciting possibilities also in the area of chemical analysis, thus making possible the assembly of customiz...
Article
Enzyme-linked immunosorbent assays are currently the most popular methods to quantify gluten in foods. Unfortunately, the antibodies used as specific receptors in such methods are not compatible with the usual solvents for the extraction of gluten proteins. In consequence, commercial tests require a high dilution of the sample after the extraction,...
Article
We describe here a convenient assembly for screen printed carbon electrodes (SPCE) suitable for enabling analyses in gaseous samples which are of course lacking in supporting electrolytes. This assembly consists of a circular crown of filter paper, soaked in a RTIL or a DES, placed upon a disposable screen printed carbon cell, so as to contact the...
Article
A rapid and user‐friendly approach is here presented for assembling smart and versatile platforms for simultaneous electrochemical and spectrophotometric measurements. They consist of an optically transparent pencil‐drawn electrochemical cell, including reference, counter and working carbon electrodes, assembled on flexible PVC supports, exploiting...
Article
Full-text available
A simple procedure for field fish sample pretreatment was developed. This treatment in combination with square wave anodic stripping voltammetry (SW-ASV) with solid gold electrodes (SGE) and gold nanoparticle-modified glassy carbon electrodes (AuNPs-GCE) was applied for the determination of total mercury content. A certified reference material (CRM...
Article
The cyclic voltammetric behaviour of propionaldehyde (PA) and hexanaldehyde (HA), in 1-butyl-3-methylimidazolium bis(trifluoromethyl-sulfonyl) imide ([BMIM][NTF2]), 1-butyl-3-methylimidazolium hydrogen sulphate ([BMIM][HSO4]) and 1-butyl-3-methylimidazolium hydroxide ([BMIM][OH]) was investigated at a platinum microelectrode. A clear oxidation proc...
Article
A simple, effective and low-cost technique is here presented for assembling flexible and robust electrochemical devices on transparent PVC supports, using ordinary tools, all installed on a commercial desktop digitally controlled plotter/cutter. Small diamond burs were first set up to rough precise and well defined patterns on the surface of smooth...
Presentation
In natural wetlands and submerged soils, humic acids (HA) are involved in numerous redox processes (Keller et al., 2009). HA can be used by facultative anaerobic bacteria as terminal electron acceptors during anaerobic respiration (Lovley et al., 1996) and upon re-aeration, they can donate electrons to oxygen (Klupfel et al., 2014). In addition to...
Article
Here we show the feasibility of using deep eutectic solvents as a faster way of selecting aptamers targeting poorly water-soluble species. This unexplored concept is illustrated for gluten proteins. In this way, detection of gluten based on aptamers can be performed directly in the extraction media with improved detectability. We envision deep impl...
Article
Herein, we show the feasibility of using deep eutectic solvents as a faster way of selecting aptamers targeting poorly water‐soluble species. This unexplored concept is illustrated for gluten proteins. In this way, aptamer‐based gluten detection can be performed directly in the extraction media with improved detectability. We envision deep implicat...
Article
A simple and sensitive device is presented based on the use of pencil-drawn paper based electrochemical detector placed at the end of a cotton thread fluidic channel in wall-jet configuration. This innovative and fast responding electroanalytical system can be adopted for both single and dual electrode electrochemical detection, this last achieved...
Conference Paper
Under anaerobic conditions, humic acids (HA) may act as terminal electron acceptors, allowing facultative anaerobic bacteria to obtain energy from anaerobic respiration. Structural and electrochemical changes due to biological oxidation and reduction were investigated on HA extracted from a peat sample, incubated under controlled aerobic and anaero...
Poster
Under anaerobic conditions, humic acids (HA) may act as terminal electron acceptors, allowing facultative anaerobic bacteria to obtain energy from anaerobic respiration. Structural and electrochemical changes due to biological oxidation and reduction were investigated on HA extracted from a peat sample, incubated under controlled aerobic and anaero...
Article
Full-text available
A simple, reliable and low-cost fabrication method is here proposed for assembling paper-based electrochemical devices using a commercial desktop digitally controlled plotter/cutter, together with ordinary writing tools. Permanent markers (tips of 1 mm) were used to create effective hydrophobic barriers on paper, while micro-mechanical pencils (mou...
Article
Full-text available
Gluten analysis is still affected by the lack of an efficient and universal extraction solvent for gliadin, i.e., the prolamine fraction of gluten which is the analytical target used to quantify gluten in food. In this investigation, the possibility of adopting pure choline chloride deep eutectic solvents (ChCl-DESs) as gliadin extraction media was...
Article
Background: The antioxidant capacity of an inactive dry yeast preparation (YD) was investigated by conventional analytical methods (spectrophotometry, HPLC) as well as by cyclic voltammetry (CV), in a (+)-catechin model wine and compared with certain of the most common antioxidants found in wine: sulfur dioxide, ascorbic acid and glutathione. Res...
Article
A composite material based on Polyvinyl alcohol (PVA) and graphene oxide (GO) was used as electrode substrate for the NiCo electrodeposition in neutral chloride bath containing 1.5 mM Ni(NO3)2 and 4.5 mM Co(NO3)2. NiCo particles were cathodically deposited by voltage cycling between − 0.5 V and 0.2 V vs. SCE (35 cycles). Voltammetric data show clea...
Article
A simple, sensitive and fast responding device is described for the discrimination of hydrophilic ortho-diphenols, whose presence in abundant enough amounts is typical for extra virgin olive oils (EVOOs), from hydrophilic mono-phenols instead present in almost all vegetable oils. It consists of a dual electrode detector pencil-drawn at the end of a...
Article
The applicability to the determination of mercury in tuna of square wave anodic stripping voltammetry (SW-ASV) conducted at both solid gold electrode (SGE) and a gold nanoparticle-modified glassy carbon electrode (AuNPs-GCE) was demonstrated. Mercury content in two certified materials and in ten samples of canned tuna was measured. The performances...
Poster
We present here an approach for the rapid, simple and cheap detection of gliadin in food, employing carboxyl functionalized multi-walled carbon nanotubes (MWCNTs) screen printed electrodes (SPE). The aptamer used is 5’-amino modified gli4 (5’-CAGTCTCCCGTTTACCGCGCCTACACATGTCTGAATGCC-3’)1. Exploiting the carboxylic acid residues present on MWCNTs, ap...
Poster
We present here an approach for the rapid, simple and cheap detection of gliadin in food, employing carboxyl functionalized multi-walled carbon nanotubes (MWCNTs) screen printed electrodes (SPE). The aptamer used is 5’-amino modified gli4 (5’-CAGTCTCCCGTTTACCGCGCCTACACATGTCTGAATGCC-3’)1. Exploiting the carboxylic acid residues present on MWCNTs, ap...
Article
A simple electrochemical microprobe (EMP) is proposed for the detection of analytes in gaseous atmospheres. The EMP consists of two platinum fibres of 25 and 300 μm in diameter encased into a theta glass pipette to form an electrochemical cell in a two-electrode configuration. Ion conductivity between the two electrodes is ensured by a thin film of...
Article
Full-text available
The pH of any polyprotic weak and strong acid (or base) can be calculated employing the logarithmic concentration diagram. The aim of this text is to introduce a joint approach of algebraic, as used in textbook, and graphical method. The logarithmic diagrams provide an easy insight into the acid–base systems. The mathematical complexities are overt...
Article
The possibility of adopting deep eutectic solvents (DESs) instead of room temperature ionic liquids (RTILs) in membrane-free electrochemical gas probes was estimated by first evaluating the performance of ethaline as electrochemical medium. This very easily prepared DES was chosen as prototype since it displays high conductivity and fairly modest v...
Article
The growing demand for low cost and easy to use analytical devices requires the development of reliable and rapid deposition strategies suitable for changing easily planned designs and applicable to a wide range of materials for assembling conductive tracks and sensitive elements. Further important challenges to be pursued are the possibility of us...
Article
We propose here simple electrochemical cells assembled with electrodes pencil drawn on paper for conducting one-spot tests enabling olive oil to be easily distinguished from other vegetable oils. They consist of small circular pads of hydrophilic paper defined by hydrophobic barriers, these last printed by using custom-designed rubber stamps, where...
Article
In this study an electrodeposition procedure of hydrated Ir(III) and Ir(IV) oxyhydroxide species operating under anodic conditions and directly from aged alkaline solution containing 6 mM IrCl63− and 20 mM Cl− a ligand specie was defined for the surface modification of the glassy carbon electrode substrates. Optimum efficiency of iridium oxide depo...
Article
Glyceric Macerates (GMs) and Mother Tinctures (MTs) are liquid preparations obtained from plant buds (for GMs) and flowers, leaves or roots (for MT) by extraction with a mixture of solvents. Their quality depends on the quality of the plant materials and on the preparation procedures. In this work we determined the concentrations of major, minor an...
Article
We propose here a quick and easy procedure for preparing pencil leads doped with Ag and AgCl suitable for the reproducible and easy drawing on paper or other porous supports of carbon based Ag/AgCl conductive lines for the use as reference electrodes. They were prepared by careful electrodeposition of silver and silver chloride on carbon powder (co...
Article
A gas sensors based on a room temperature ionic liquid (RTIL) supported on paper is proposed as amperometric sniffer for monitoring volatile amines (VAs) released from fish samples, in order to gain indication of their state of turning spoiled. It was used as a paper electrochemical detector (PED) for a flow injection system in which controlled hea...
Article
A simple strategy is here described for assembling graphite-based pencil leads doped with electrode modifiers suitable for drawing electrochemical devices on porous materials such as paper in a very reproducible and easy way. They were prepared by mixing controlled amounts of the chosen modifier with different quantities of carbon powder (conductiv...
Article
The voltammetric behavior of a glassy carbon electrode modified with multiwalled carbon nanotubes (MWCNTs) and Au particles was studied in alkaline medium towards the electrooxidation of some carbohydrates used as model compounds. The influence of carbohydrate concentration and scan rate on peak potentials, peak currents, etc., observed at the modi...
Article
AbstractA simple method is described to discriminate between analytes comigrating under on‐plate separation conditions, whose electrochemical behavior displays different reversible characters. It is based on the use of dual electrode detectors pencil‐drawn at the end of paper‐based fluidic channels defined by hydrophobic barriers. Simultaneous dete...
Article
A simple procedure for preparing inexpensive paper-based three-electrode electrochemical cells is here described. They consist of small circular pads of hydrophilic paper defined by hydrophobic barriers printed on paper with wax-based ink. The back face of these pads is insulated by thermally laminating a polyethylene layer and working, reference a...
Article
An array of quartz crystals coated with different room-temperature ionic liquids (RTILs) is proposed for the analysis of flavors by quartz crystal microbalance (QCM) measurements. Seven RTILs were adopted as sensing layers, all containing imidazolium or phosphonium cations, differing from one another in the length and branching of alkyl groups, and...
Article
A high density polyethylene (HDPE)/calcium carbonate (CaCO(3)) film containing TiO(2) was prepared via blown film extrusion process. The photocatalytic properties of this film were evaluated by voltammetric, UV-Vis spectrophotometric and gas chromatographic measurements following the decomposition rate of suitably selected molecular probes, such as...
Article
A prototype of a fast-response task-specific amperometric gas sensor based on paper-supported room-temperature ionic liquids (RTILs) is proposed here for improved analysis of volatile acid species. It consists of a small filter paper foil soaked with a RTIL mixture containing an ionic liquid whose anion (acetate) displays a basic character, upon wh...
Article
A conveniently assembled membrane-free amperometric sensor is proposed for the detection of oxygen in gaseous atmospheres which exploits some profitable properties of room temperature ionic liquids (RTILs), such as their high electrical conductivity, negligible vapour pressure and good thermal stability. The advantages offered by this type of mediu...
Article
AbstractA conveniently assembled, sensitive and fast‐responding membrane free amperometric sensor is described for the detection of nitrogen oxides in gaseous atmospheres which exploits some profitable properties of room temperature ionic liquids (RTILs), such as high electrical conductivity, negligible vapor pressure and good thermal stability. It...
Article
Full-text available
A sensitive and fast-responding membrane-free amperometric gas sensor is described, consisting of a small filter paper foil soaked with a room temperature ionic liquid (RTIL), upon which three electrodes are screen printed with carbon ink, using a suitable mask. It takes advantage of the high electrical conductivity and negligible vapour pressure o...
Article
Full-text available
The use of a mixed-valent ruthenium oxide/hexacyanoruthenate polymeric film electrochemically deposited onto glassy carbon electrodes is proposed here for the detection of biogenic amines and their amino acid precursors, following their separation by microchip capillary electrophoresis. The ability of this ruthenium coating to electrocatalyze the o...
Article
Based on preliminary voltammetric investigations at unmodified and modified electrodes in aqueous solutions buffered at different pHs, a profitable thin layer dual-electrode detector was developed for the selective and simultaneous determination of ascorbic acid (AA) and hydrogen peroxide present in the same samples. It consists of a small thicknes...
Article
A simple hydrodynamic injection method is proposed here for microchip CE coupled to electrochemical detection. It is based on the use of a precise syringe pump to push the sample into the microfluidic circuit, accompanied by the application of a secondary electric field to the injection channel, soon after the end of the injection step. In such a w...
Article
A porous gold electrode supported on one face of an ion-exchange membrane, acting as a solid polymer electrolyte (SPE), is proposed as an amperometric sniffer for monitoring the aldehyde content in the headspace in equilibrium with lipid samples, in order to gain indication of their state of turning rancid It was used as a detector for a flow injec...
Article
A sensitive and fast responding electrochemical sensor is described for the determination of free and total sulphur dioxide in wines and grape juices which prevents interferences coming from ethanol and other natural components. It consists of a cell provided with a porous gold working electrode supported on one face of an ion-exchange membrane, ac...
Article
A method based on microchip electrophoresis with electrochemical detection has been developed for the simultaneous determination at trace levels of the main small-chain aldehydes (formaldehyde, acetaldehyde and 2-propenal) present in the atmosphere. Sampling was performed by forcing atmospheres through silica-gel cartridges coated with 2,4-dinitrop...
Article
A method, based on microchip electrophoresis with electrochemical detection, has been developed for the simultaneous determination of light aliphatic aldehydes (acetaldehyde, propionaldehyde, butyraldehyde and hexylaldehyde) derivatized with 2,4-dinitrophenylhydrazine (DNPH). Optimal conditions for the derivatization reaction, providing recoveries...
Article
The antioxidant capacity of the main phenolic compounds present in wood smoke and smoke flavourings used in the food industry was investigated by three methods, based on a kinetic and thermodynamic approach: the bleaching of the carotenoid crocin, the scavenging of the DPPH radical, and the determination of the oxidation potential. The reaction wit...
Article
A conveniently assembled probe is here proposed for the electrochemical detection of the phenol index (total volatile phenols) in wastewaters, which exploits some advantageous properties of ionic liquids (ILs), such as their negligible vapor pressure, good electrical conductivity and ability to dissolve a wide range of organic and inorganic compoun...
Article
An in-channel configuration for amperometric detection has been adopted in capillary electrophoresis performed in photolithographically microfabricated chips. This electrode alignment, compared with the more conventional end-channel configuration, led to a better peak resolution and a higher sensitivity, because it involves no gap between the chann...
Article
Full-text available
Based on preliminary voltammetric investigations at both Pt and Au electrodes in aqueous solutions buffered at different pH values in the range 0–10, two possible profitable triple-pulse amperometric approaches were developed for determining simultaneously peroxyacetic acid (PAA) and hydrogen peroxide present in the same samples. At both surfaces a...
Article
A piezoelectric immunosensor is described which consists of a gold filmed quartz crystal, whose surface is modified with a thin Nafion layer entrapping known amounts of the specific antibody. This layer was applied by droplet evaporation on the gold surface of a mixture prepared by mixing a stock ethanol solution of Nafion with a stock antibody sus...
Article
The relationships between the redox potential and the chain-breaking activity of a glucose-glycine model system as well as of natural or heat-induced antioxidant-containing foods, when they undergo changes of their oxidative status, were studied. Results showed that redox potential may represent an interesting indicator of the antioxidant efficienc...
Article
Full-text available
A conveniently assembled electrochemical cell, exploiting a porous electrode supported on a moist perfluorinated ion-exchange polymer, is proposed for profitable electrochemical detection in supercritical fluid chromatography. It consists of a porous Pt working electrode, contacted by the mobile phase from the chromatographic column, which is chemi...
Article
Cathodic stripping voltammetry (CSV), ion-chromatography (IC) and spectrophotometry (SP) have been tested as instrumental approaches alternative to inductively coupled plasma mass spectrometry (ICP-MS) for the determination of inorganic bromide residues in foodstuffs fumigated with brominated pesticides and digested by a suitably improved microwave...
Article
The antioxidant capacity of some calcium antagonists and one calcium agonist 1,4-dihydropyridines (DHPs) was evaluated by a competitive kinetic procedure. With the exception of Amlodipine, all the calcium antagonist DHPs display an unambiguous antioxidant capacity, while for the calcium agonist DHP (Bay K 8644) no measurable reactivity towards pero...
Article
The quenching of superoxide ions, O2.-, by curcumin has been studied by electrogenerating this anion radical from oxygen dissolved in acetonitrile solvent (that is, at best, a mimic of the lipofilic layer of biological membranes), containing known amounts of curcumin. Voltammetric tests, combined with coulometric and spectrophotometric measurements...
Article
The release of heavy metals from uncovered and nickel-covered brass pumps has been evaluated by ICP-MS analysis in both simple ultrapure water and 3% acetic acid solution (mimic of neutral and acid edible liquids, respectively), following a procedure similar to that recommended by the National Sanitation Foundation (NSF) International, Test Procedu...
Article
An amperometric sensor is described which is suitable for the continuous monitoring of traces of hydrogen peroxide present in workplace atmospheres as gaseous species or as aerosols, without preliminary concentration steps being needed. It consists of a porous Pt sensing electrode, facing the sample, chemically deposited onto one side of a Nafion®...