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39 results on '"Pizzariello, Andrea"'

12. A solid binding matrix/molecularly imprinted polymer-based sensor system for the determination of clenbuterol in bovine liver using differential-pulse voltammetry

Author

Miertus Stanislav, Stredansky Miroslav, Stredanska Silvia, and Pizzariello Andrea

Subjects
Chromatography, Chemistry, Extraction (chemistry), Metals and Alloys, Molecularly imprinted polymer, Condensed Matter Physics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Matrix (chemical analysis), Clenbuterol, Isoxsuprine, Materials Chemistry, medicine, Differential pulse voltammetry, Electrical and Electronic Engineering, Molecular imprinting, Instrumentation, Voltammetry, medicine.drug
Abstract

A selective and sensitive method has been developed for the determination of clenbuterol in bovine liver samples using differential-pulse voltammetry (DPV), based on the electrochemical behaviour of clenbuterol at a molecularly imprinted polymer (MIP)-modified solid binding matrix composite electrode (SBMCE). The method of clenbuterol detection involves two steps. In the first step, clenbuterol binds selectively to the MIP. In the second step, an electroinactive competitor (isoxsuprine) is added in excess, whence some of the bound clenbuterol is released. The released clenbuterol is analysed using DPV. The electrode renewal was achieved by a simple mechanical polishing step of the SBMCE surface. The determination of clenbuterol in bovine liver fortified with increasing concentrations of this drug is also described, involving liquid–liquid extraction followed by a mixed-mode solid-phase extraction procedure. The integrated MIP–SBMCE displays good mechanical properties, electrochemical performances and can be a very useful tool in monitoring the use of anabolics in meat production.

Published
2001

37. PH-SENSITIVE AMPEROMETRIC BIOSENSOR

Author

SAICOM S R L, PIZZARIELLO ANDREA, STREDANSKY MIROSLAV, STREDANSKA SILVIA, and MIERTUS STANISLAV

Subjects
C12Q1/00
Abstract

The present invention describes a new electrochemical biosensor comprising (i) a biocatalyst producing a pH change when interacting with the analyte to be determined and (ii) a compound exhibiting different redox properties both in its protonated and non-protonated forms (pH-sensitive redox compound). The elements described above are integrated in a biosensor system composed of a working electrode and a reference electrode connected to an ammeter. When the analyte is present, the system produces a current change that is proportional to the concentration of the analyte. The biosensors described herein can be used in the accurate detection of a wide range of analytes. They can be used in diagnostics, industrial processes, food and feed quality control, biotechnology, pharmaceutical industry, environmental monitoring and so on.

38. Effect of TiO2 photocatalytic activity in a HDPE-based food packaging on the structural and microbiological stability of a short-ripened cheese

Author

Gumiero, Matteo, Peressini, Donatella, Pizzariello, Andrea, Sensidoni, Alessandro, Iacumin, Lucilla, Comi, Giuseppe, and Toniolo, Rosanna

Subjects
*TITANIUM oxides, *PHOTOCATALYSIS, *HIGH density polyethylene, *FOOD packaging, *MICROBIOLOGY, *CHEESE ripening
Abstract

Abstract: A high density polyethylene (HDPE)/calcium carbonate (CaCO3) film containing TiO2 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 4-hydroxybenzoic acid and methylene blue. The film containing 1% w/w of TiO2 displayed a profitable and reproducible photoinduced degradation activity towards target organic compounds. The effect of packaging photocatalytic activity on the structural and microbiological stability of a short-ripened cheese was studied. Cheese structure was assessed by dynamic, small deformation rheological tests. A container consisting of a multilayer material, where the layer brought in contact with the food, made from the HDPE+CaCO3 +TiO2 composite matrix, was able to provide a greater maintenance of the original cheese structure than a rigid container currently used, mainly due to the inhibition of lactic acid bacteria and coliforms. [Copyright &y& Elsevier]

Published
2013
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39. A comparison among different instrumental approaches for bromide analysis in foodstuffs digested by a suitably modified microwave procedure

Author

Di Narda, Francesca, Toniolo, Rosanna, Susmel, Sabina, Pizzariello, Andrea, and Bontempelli, Gino

Subjects
*MICROWAVES, *VOLTAMMETRY
Abstract

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 procedure proposed previously. They were chosen in view of the fact that the relevant instrumentation is less expensive than that required for ICP-MS and more frequently available in analytical laboratories designed for routine food control. These approaches were compared with one another, as well as with the ICP-MS method previously adopted, not only with regard to their performance, but also in terms of the interferences caused by the composition of final samples coming from the microwave digestion procedure. The results found pointed out unambiguously that IC turns out to be well suited for replacing ICP-MS, thanks to its consistency with the composition of digested samples and its good sensitivity which allows a quite low detection limit for bromides (0.2 mg kg−1) to be achieved. Conversely, CSV and SP performance appears to be significantly affected by interferences caused by the presence in digested samples of chlorides and ammonium ions, respectively. [Copyright &y& Elsevier]

Published
2003
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