Fish freshness is one of the major concerns in food analysis. Several methods are currently employed to get information about freshness of samples, while many of these methods give sufficient information for freshly stored fish they are... more
Fish freshness is one of the major concerns in food analysis. Several methods are currently employed to get information about freshness of samples, while many of these methods give sufficient information for freshly stored fish they are not reliable in case of thawed fishes. In this paper an electronic nose is applied to the analysis of trout fishes both freshly stored and thawed. Results show a good capability of the electronic nose to discriminate among the different storage days (93% of correct classification) and between freshly stored and thawed fishes, disregarding the freshness degree (84% of correct classification).
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The oxygen transport in blood is threatened by the presence of carbon monoxide. CO indeed permanently replaces the oxygen molecule in the hemoglobin making this last no more effective as oxygen carrier. This mechanism is ruled by the... more
The oxygen transport in blood is threatened by the presence of carbon monoxide. CO indeed permanently replaces the oxygen molecule in the hemoglobin making this last no more effective as oxygen carrier. This mechanism is ruled by the properties of a particular metalloporphyrin (heme) for which the binding energy with CO is about 250 times higher than that towards O2.
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This paper presents the VISTA (Volatile In Situ Thermogravimetry Analyser) instrument, conceived to perform planetary in-situ measurements. VISTA can detect and quantify the presence of volatile compounds of astrobiological interest, such... more
This paper presents the VISTA (Volatile In Situ Thermogravimetry Analyser) instrument, conceived to perform planetary in-situ measurements. VISTA can detect and quantify the presence of volatile compounds of astrobiological interest, such as water and organics, in planetary samples. These measurements can be particularly relevant when performed on primitive asteroids or comets, or on targets of potential astrobiological interest such as Mars or Jupiter's satellite Europa. VISTA is based on a micro-thermogravimetry technique, widely used in different environments to study absorption and sublimation processes. The instrument core is a piezoelectric crystal microbalance, whose frequency variations are affected by variations of the mass of the deposited sample, due to chemical processes such as sublimation, condensation or absorption/desorption. The low mass (i.e. 40 g), the low volume (less than 10 cm(3)) and the low power (less than 1 W) required makes this kind of instrument very suitable for space missions. This paper discusses the planetary applications of VISTA, and shows the calibration operations performed on the breadboard, as well as the performance tests which demonstrate the capability of the breadboard to characterize volatile compounds of planetary interests.
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Porphyrin diads have been synthesized and studied as enantioselective receptor for chiral recognition in solid state. Self-assembled monolayers have been deposited onto the gold electrodes of thickness shear mode resonators to be... more
Porphyrin diads have been synthesized and studied as enantioselective receptor for chiral recognition in solid state. Self-assembled monolayers have been deposited onto the gold electrodes of thickness shear mode resonators to be exploited as sensing materials of nanogravimetric sensors operating in the gas phase. The enantiodiscrimination properties of such a sensors towards the enantiomeric pairs of chiral analytes have been studied. While in the case of analytes bearing donor ligand atoms we did not observe a significant enantioselectivity, a significant degree of chiral discrimination has been observed in the case of limonene; this result is particularly encouraging for the potential development of enantioselective chemical sensors to be exploited in an array configuration.
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ABSTRACT A fiber optic multimeter is presented, consisting of a platform for interrogating an array of absorption-based chemical sensors. It has been validated on a set of porphyrin-based materials having gas-sensor potential.... more
ABSTRACT A fiber optic multimeter is presented, consisting of a platform for interrogating an array of absorption-based chemical sensors. It has been validated on a set of porphyrin-based materials having gas-sensor potential. Discrimination between different kinds of gases has been demonstrated.
Abstruct - Electronic noses have been designed ad utilized ,for a variety of different applications. Undoubtedly, among these, food analysis has gained the major mention. In fact in food analysis there is a double opportunity for... more
Abstruct - Electronic noses have been designed ad utilized ,for a variety of different applications. Undoubtedly, among these, food analysis has gained the major mention. In fact in food analysis there is a double opportunity for elecfvxic noses developers. The first is ...
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ABSTRACT
ABSTRACT In the present work the interaction of Zn-Tetraphenylporphyrins with chemically different volatile compounds are reported, in order to create Thickness-Share-Mode-Resonators (TSMRs) with optimal thickness for sensing response.... more
ABSTRACT In the present work the interaction of Zn-Tetraphenylporphyrins with chemically different volatile compounds are reported, in order to create Thickness-Share-Mode-Resonators (TSMRs) with optimal thickness for sensing response. Previous results showed isotherm curves typical for each chemical compound, thus demonstrating the selectivity of the used Zn-Porphyrins. However, other parameters are expected to contribute to the isotherm shape, such as the coating porosity, roughness and thickness. In this paper, the behaviour of TSMR sensors prepared with different amounts of the same coating has been investigated. Results indicate a strong correlation between sensor properties and deposition parameters opening the way to optimised sensor fabrication.
CLASSIFICATION OF COMPLEX MIXTURES WITH AN ELECTRONIC NOSE: THE CASE OF PHARMACEUTICAL PRODUCTS Giorgio Pennazza1, Antonella Macagnano2, Eugenia Martinelli1, Roberto Paolesse2'3, Corrado DiNatale1'2, Amaldo... more
CLASSIFICATION OF COMPLEX MIXTURES WITH AN ELECTRONIC NOSE: THE CASE OF PHARMACEUTICAL PRODUCTS Giorgio Pennazza1, Antonella Macagnano2, Eugenia Martinelli1, Roberto Paolesse2'3, Corrado DiNatale1'2, Amaldo D'Amico1'2 1. ...
Prevention strategy is nowadays the main way in the complex issue of medical diagnosis. In this wake, performing non-invasive medical tests oriented to an early diagnosis is one of the challenges for the promotion of new classes of... more
Prevention strategy is nowadays the main way in the complex issue of medical diagnosis. In this wake, performing non-invasive medical tests oriented to an early diagnosis is one of the challenges for the promotion of new classes of instruments and for a faster intervention on the patient.Clinical chemistry is the starting point of this challenge due to the fact that
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Metalloporphyrins shown interesting properties as sensitive material for chemical sensors. In particular, they shown brilliant behaviours in electronic nose applications. From the point of view of this kind of applications it is necessary... more
Metalloporphyrins shown interesting properties as sensitive material for chemical sensors. In particular, they shown brilliant behaviours in electronic nose applications. From the point of view of this kind of applications it is necessary to differentiate sensor selectivity. In this paper, a method to enhance the selectivity of metalloporphyrins to hydrogen bond interacting compounds is illustrated. Furthermore, the structural modification of
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THE OPTICAL TRANSDUCTION OF THE SENSITIVE PROPERTIES OF METALLOPORPHYRINS FILMS Patrizia Bizzarri*, Antonella Macagnano*. Roberto Paolesse0, Sara Nardis, Arnaldo D'Amico*, Andrea Mencaglia*, Anna Grazia Mignani*, Corrado Di... more
THE OPTICAL TRANSDUCTION OF THE SENSITIVE PROPERTIES OF METALLOPORPHYRINS FILMS Patrizia Bizzarri*, Antonella Macagnano*. Roberto Paolesse0, Sara Nardis, Arnaldo D'Amico*, Andrea Mencaglia*, Anna Grazia Mignani*, Corrado Di Natale, Department of ...
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ABSTRACT In this paper, a QMB sensor based on an integrated micro heater with both a low cost and a simple usage structure is presented. The influence of temperature tuning ad-desorption mechanisms was studied in presence of controlled... more
ABSTRACT In this paper, a QMB sensor based on an integrated micro heater with both a low cost and a simple usage structure is presented. The influence of temperature tuning ad-desorption mechanisms was studied in presence of controlled volatiles flows. A Metal-porphyrin thin film, as chemical interacting material, was deposited on a quartz surface, by the spray casting technique. The aims of this work were oriented to understand the influence on the measurement time, to limit the drift and to improve the reproducibility of the measurement.
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In this work we present preliminary results on surface acoustic waves (SAW) chemical sensors based on a new AlN/diamond/Si multilayered structure. The high SAW velocity in diamond allows it to operate at higher frequencies at moderate... more
In this work we present preliminary results on surface acoustic waves (SAW) chemical sensors based on a new AlN/diamond/Si multilayered structure. The high SAW velocity in diamond allows it to operate at higher frequencies at moderate interdigital transducer (IDT) line-width resolution in order to increase the sensor output signals, with the aim to increase the sensor sensitivity. Aluminium nitride has
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Among various attempts of mimicking olfactory system the present work focuses on the sensorial surface of mammalian olfactory cells. The aim of this research is to develop, in a single step, synthetic fibres mimicking the long, no motile... more
Among various attempts of mimicking olfactory system the present work focuses on the sensorial surface of mammalian olfactory cells. The aim of this research is to develop, in a single step, synthetic fibres mimicking the long, no motile cilia of the olfactory cells. Electrospun conductive nanofibrous layers of doped polyaniline, suitably blended to a group of polymers capable to carry
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Platinum nanoparticles (PtNPs), with diameters of 3-10 nm, were synthesized by water phase reduction, using 3-mercapto-1-propanesulfonate (3MPS) as a hydrophilic capping agent. PtNPs were deposited by a dipcoating technique on titania... more
Platinum nanoparticles (PtNPs), with diameters of 3-10 nm, were synthesized by water phase reduction, using 3-mercapto-1-propanesulfonate (3MPS) as a hydrophilic capping agent. PtNPs were deposited by a dipcoating technique on titania nanofibers (TiO2NFs), obtained by electrospinning. The investigated properties of the Pt-TiO2 hybrid at room temperature show that this material combines the properties of photoconduction of titania and the photocatalytic activity of the hybrid. To assess the best performance of Pt-TiO2, different measurements were performed at room temperature, comparing hydrogen response under UV of the uncoated TiO2NFs, compared with the Pt-TiO2 system prepared with two different amounts of PtNPs. During the sensing tests toward hydrogen an enhancement of photoconductivity (150%), an increase in response (400%) and an overall improvement of their dynamic behaviour were observed.
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ABSTRACT Usually, ammonium in soil is carried out through steam distillation of ammonia obtained after alkalinization of soil extracts and further back titration of the collected solutions. Alternatively, ion selective electrodes (ISE)... more
ABSTRACT Usually, ammonium in soil is carried out through steam distillation of ammonia obtained after alkalinization of soil extracts and further back titration of the collected solutions. Alternatively, ion selective electrodes (ISE) specific for ammonium ions can be used, in order to measure their concentration in aqueous soil extracts. The aim of this study is to assess the possibility to use, alternatively to the previous techniques, two kinds of chemical sensors able to measure NH3, such as an interdigital microelectrode (IDE) coated of conductive polymer and a sensors array, usually named electronic nose (EN), based on quartz crystal microbalances (QCMs) covered with functionalized polymers. These sensors were chosen on the base of their ability to detect NH3 in sample headspace (specifically or aspecifically, respectively). Therefore, NH4+ in solution was converted to NH3 by alkalinizing soil extracts. Sensors were calibrated at first against known concentrations of NH4+. Results were compared with those obtained with an ISE for NH4+.
ABSTRACT A fiber optic multimeter is presented, consisting of a platform for interrogating an array of absorption-based chemical sensors. It has been validated on a set of porphyrin-based materials having gas-sensor potential.... more
ABSTRACT A fiber optic multimeter is presented, consisting of a platform for interrogating an array of absorption-based chemical sensors. It has been validated on a set of porphyrin-based materials having gas-sensor potential. Discrimination between different kinds of gases has been demonstrated.
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Electronic noses using in the same array different sensor technologies have yet been proposed as a method to increase discrimination performances. In this paper two arrays based on porphyrins coated QMB and sol-gel prepared SnO 2 sensors... more
Electronic noses using in the same array different sensor technologies have yet been proposed as a method to increase discrimination performances. In this paper two arrays based on porphyrins coated QMB and sol-gel prepared SnO 2 sensors are evaluated, compared and ...
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Fish freshness is one of the major concerns in food analysis. Several methods are currently employed to get information about freshness of samples, while many of these methods give sufficient information for freshly stored fish they are... more
Fish freshness is one of the major concerns in food analysis. Several methods are currently employed to get information about freshness of samples, while many of these methods give sufficient information for freshly stored fish they are not reliable in case of thawed fishes.
Research Interests:
The absolute selectivity of chemical sensors ceased in the last years to be a fundamental feature due to the uprising of many applications, such as electronic noses, which require the presence of broad selectivity sensors. On the other... more
The absolute selectivity of chemical sensors ceased in the last years to be a fundamental feature due to the uprising of many applications, such as electronic noses, which require the presence of broad selectivity sensors. On the other hand for these applications the attention is paid ...
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In recent years the preparation of organic films has made remarkable progress and nowadays it is possible to arrange molecular films onto a surface with a high degree of order. Among these techniques very important for the consequences... more
In recent years the preparation of organic films has made remarkable progress and nowadays it is possible to arrange molecular films onto a surface with a high degree of order. Among these techniques very important for the consequences connected to the sensors performances, ...