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Sacco O, Vaiano V, Sannino D, Picca R, Cioffi N. Ag modified ZnS for photocatalytic water pollutants degradation: Influence of metal loading and preparation method. J Colloid Interface Sci 2019; 537:671-681. [DOI: 10.1016/j.jcis.2018.11.073] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 11/16/2018] [Accepted: 11/18/2018] [Indexed: 12/22/2022]
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Cresti A, Baratta P, De Sensi F, Solari M, Sposato B, Minelli S, Cioffi N, Franci L, Scalese M, Limbruno U. Normal Values of the Mitral-Aortic Intervalvular Fibrosa Thickness: A Multimodality Study. J Cardiovasc Echogr 2019; 29:95-102. [PMID: 31728299 PMCID: PMC6829758 DOI: 10.4103/jcecho.jcecho_28_19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Background: The avascular region of the fibrous body between the mitral and aortic valves, named mitral-aortic intervalvular fibrosa (MAIVF), is often involved in the periaortic diffusion of infective endocarditis (IE), resulting in abscess or pseudoaneurysm formation. The early recognition of these life-threatening complications is of crucial importance, as urgent surgical correction is necessary. In the first stages of the abscess formation, the only sign is an increased thickness of the MAIVF. To the best of our knowledge, normal transesophageal echocardiography (TEE) examination reference values for MAIVF thickness has not yet been established. The aim of the study was to define the normal ranges of MAIVF thickness in a population of healthy adults who underwent a TEE examination. Materials and Methods: A population of consecutive adult patients who underwent a TEE examination was enrolled in the study. Measurement was performed in short-axis (SAX) and long-axis (LAX) views. Mean-2 standard deviations (mean-2SDs) and 5%, 10%, 90%, and 95% confidence intervals were evaluated. A comparison with MAIVF thickness in patients affected by aortic IE complicated by abscess formation was performed, and receiver operating characteristic (ROC) curves were constructed to achieve the optimal cutoff value of normality. Results: A total of 477 consecutive Caucasian adult patients were enrolled (mean age: 69 years, range: 27–93 years). Mean-2SD MAIVF measurement in SAX view was 0.325 cm (95% confidence interval [CI]: 0.319–0.330 cm) and in LAX view was 0.340 cm (95% CI: 0.334–0.346 cm). Computed tomography–MAIVF mean measurement (±2SD) was 0.237 cm (95% CI: 0.110–0.340 cm). ROC curves showed that a cutoff SAX value measurement of 0.552 (area under the curve [AUC]: 95.2%) had a sensibility of 88.2% and a specificity of 92.4%; a LAX measurement value of 0.623 (AUC: 93.3%) had a sensibility of 82.7% and a specificity of 85.7%. The multivariate analysis showed no significant correlation between MAIVF thickness, age, and sex. Conclusion: In healthy patients, MAIVF thickness should not exceed 0.600 cm. Above these values, the suspicion of a periaortic abscess formation should be raised. MAIVF increased thickness may be an early sign of perivalvular diffusion requiring an urgent endocarditis team evaluation.
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Affiliation(s)
- Alberto Cresti
- Cardio-Neurovascular Department, Misricordia Hospital, Grosseto, Italy
| | - Pasquale Baratta
- Cardio-Neurovascular Department, Misricordia Hospital, Grosseto, Italy
| | | | - Marco Solari
- Cardio-Neurovascular Department, Misricordia Hospital, Grosseto, Italy
| | - Bruno Sposato
- Pneumology Department, Azienda USL Toscana Sudest, Misericordia Hospital, Grosseto, Italy.,Department of Systems Medicine, University of Rome Tor Vergata, Rome, Italy
| | - Stefano Minelli
- Pneumology Department, Azienda USL Toscana Sudest, Misericordia Hospital, Grosseto, Italy
| | - Nevada Cioffi
- Department of Systems Medicine, University of Rome Tor Vergata, Rome, Italy
| | - Luca Franci
- Department of Systems Medicine, University of Rome Tor Vergata, Rome, Italy
| | - M Scalese
- Department of Epidemiology and Health Research, Institute of Clinical Physiology, National Council of Research, F. G. Monasterio, Pisa, Italy
| | - Ugo Limbruno
- Cardio-Neurovascular Department, Misricordia Hospital, Grosseto, Italy
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Calvano CD, Picca RA, Bonerba E, Tantillo G, Cioffi N, Palmisano F. MALDI-TOF mass spectrometry analysis of proteins and lipids in Escherichia coli exposed to copper ions and nanoparticles. J Mass Spectrom 2016; 51:828-840. [PMID: 27476478 DOI: 10.1002/jms.3823] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2016] [Revised: 07/16/2016] [Accepted: 07/25/2016] [Indexed: 06/06/2023]
Abstract
Escherichia coli (E. coli) is one of the most important foodborne pathogens to the food industry responsible for diseases as bloody diarrhea, hemorrhagic colitis and life-threatening hemolytic-uremic syndrome. For controlling and eliminating E. coli, metal nano-antimicrobials (NAMs) are frequently used as bioactive systems for applications in food treatments. Most NAMs provide controlled release of metal ions, eventually slowing down or completely inhibiting the growth of undesired microorganisms. Nonetheless, their antimicrobial action is not totally unraveled and is strongly dependent on metal properties and environmental conditions. In this work, we propose the use of matrix-assisted laser desorption ionization time-of-flight (MALDI TOF) mass spectrometry as a powerful tool for direct, time efficient, plausible identification of the cell membrane damage in bacterial strains exposed to copper-based antimicrobial agents, such as soluble salts (chosen as simplified AM material) and copper nanoparticles. E. coli ATCC 25922 strain was selected as 'training bacterium' to set up some critical experimental parameters (i.e. cell concentration, selection of the MALDI matrix, optimal solvent composition, sample preparation method) for the MS analyses. The resulting procedure was then used to attain both protein and lipid fingerprints from E. coli after exposure to different loadings of Cu salts and NPs. Interestingly, bacteria exposed to copper showed over-expression of copper binding proteins and degradation of lipids when treated with soluble salt. These findings were completed with other investigations, such as microbiological experiments. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- C D Calvano
- Dipartimento di Chimica, Università degli Studi di Bari Aldo Moro, Campus Universitario, Via E. Orabona 4, Bari, 70126, Italy
- Centro di Ricerca Interdipartimentale S.M.A.R.T., Università degli Studi di Bari Aldo Moro, Campus Universitario, Via E. Orabona 4, Bari, 70126, Italy
| | - R A Picca
- Dipartimento di Chimica, Università degli Studi di Bari Aldo Moro, Campus Universitario, Via E. Orabona 4, Bari, 70126, Italy
| | - E Bonerba
- Dipartimento di Medicina Veterinaria, Università degli Studi di Bari, Strada provinciale per Casamassima Km 3, 70100, Valenzano (BA), Italy
| | - G Tantillo
- Dipartimento di Medicina Veterinaria, Università degli Studi di Bari, Strada provinciale per Casamassima Km 3, 70100, Valenzano (BA), Italy
| | - N Cioffi
- Dipartimento di Chimica, Università degli Studi di Bari Aldo Moro, Campus Universitario, Via E. Orabona 4, Bari, 70126, Italy
- Centro di Ricerca Interdipartimentale S.M.A.R.T., Università degli Studi di Bari Aldo Moro, Campus Universitario, Via E. Orabona 4, Bari, 70126, Italy
| | - F Palmisano
- Dipartimento di Chimica, Università degli Studi di Bari Aldo Moro, Campus Universitario, Via E. Orabona 4, Bari, 70126, Italy
- Centro di Ricerca Interdipartimentale S.M.A.R.T., Università degli Studi di Bari Aldo Moro, Campus Universitario, Via E. Orabona 4, Bari, 70126, Italy
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Ditaranto N, Picca R, Sportelli M, Sabbatini L, Cioffi N. Surface characterization of textiles modified by copper and zinc oxide nano-antimicrobials. SURF INTERFACE ANAL 2016. [DOI: 10.1002/sia.5951] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- N. Ditaranto
- Dipartimento di Chimica; Università degli Studi di Bari “Aldo Moro”; via Orabona 4 Bari 70126 Italy
| | - R.A. Picca
- Dipartimento di Chimica; Università degli Studi di Bari “Aldo Moro”; via Orabona 4 Bari 70126 Italy
| | - M.C. Sportelli
- Dipartimento di Chimica; Università degli Studi di Bari “Aldo Moro”; via Orabona 4 Bari 70126 Italy
| | - L. Sabbatini
- Dipartimento di Chimica; Università degli Studi di Bari “Aldo Moro”; via Orabona 4 Bari 70126 Italy
| | - N. Cioffi
- Dipartimento di Chimica; Università degli Studi di Bari “Aldo Moro”; via Orabona 4 Bari 70126 Italy
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Paladini F, Picca RA, Sportelli MC, Cioffi N, Sannino A, Pollini M. Surface chemical and biological characterization of flax fabrics modified with silver nanoparticles for biomedical applications. Mater Sci Eng C Mater Biol Appl 2015; 52:1-10. [PMID: 25953533 DOI: 10.1016/j.msec.2015.03.035] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 01/16/2015] [Accepted: 03/22/2015] [Indexed: 02/07/2023]
Abstract
Silver nanophases are increasingly used as effective antibacterial agent for biomedical applications and wound healing. This work aims to investigate the surface chemical composition and biological properties of silver nanoparticle-modified flax substrates. Silver coatings were deposited on textiles through the in situ photo-reduction of a silver solution, by means of a large-scale apparatus. The silver-coated materials were characterized through X-ray Photoelectron Spectroscopy (XPS), to assess the surface elemental composition of the coatings, and the chemical speciation of both the substrate and the antibacterial nanophases. A detailed investigation of XPS high resolution regions outlined that silver is mainly present on nanophases' surface as Ag2O. Scanning electron microscopy and energy dispersive X-ray spectroscopy were also carried out, in order to visualize the distribution of silver particles on the fibers. The materials were also characterized from a biological point of view in terms of antibacterial capability and cytotoxicity. Agar diffusion tests and bacterial enumeration tests were performed on Gram positive and Gram negative bacteria, namely Staphylococcus aureus and Escherichia coli. In vitro cytotoxicity tests were performed through the extract method on murine fibroblasts in order to verify if the presence of the silver coating affected the cellular viability and proliferation. Durability of the coating was also assessed, thus confirming the successful scaling up of the process, which will be therefore available for large-scale production.
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Affiliation(s)
- F Paladini
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, Italy.
| | - R A Picca
- Department of Chemistry, University of Bari "Aldo Moro", Via Orabona 4, 70126 Bari, Italy
| | - M C Sportelli
- Department of Chemistry, University of Bari "Aldo Moro", Via Orabona 4, 70126 Bari, Italy
| | - N Cioffi
- Department of Chemistry, University of Bari "Aldo Moro", Via Orabona 4, 70126 Bari, Italy
| | - A Sannino
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, Italy
| | - M Pollini
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, Italy
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Colaianni L, Kung SC, Taggart DK, Picca RA, Greaves J, Penner RM, Cioffi N. Reduction of spectral interferences using ultraclean gold nanowire arrays in the LDI-MS analysis of a model peptide. Anal Bioanal Chem 2014; 406:4571-83. [DOI: 10.1007/s00216-014-7876-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Revised: 04/14/2014] [Accepted: 05/05/2014] [Indexed: 01/01/2023]
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Conte A, Longano D, Costa C, Ditaranto N, Ancona A, Cioffi N, Scrocco C, Sabbatini L, Contò F, Del Nobile M. A novel preservation technique applied to fiordilatte cheese. INNOV FOOD SCI EMERG 2013. [DOI: 10.1016/j.ifset.2013.04.010] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Longano D, Ditaranto N, Cioffi N, Di Niso F, Sibillano T, Ancona A, Conte A, Del Nobile MA, Sabbatini L, Torsi L. Analytical characterization of laser-generated copper nanoparticles for antibacterial composite food packaging. Anal Bioanal Chem 2012; 403:1179-86. [DOI: 10.1007/s00216-011-5689-5] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2011] [Revised: 12/17/2011] [Accepted: 12/20/2011] [Indexed: 10/14/2022]
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Colaianni L, Kung SC, Taggart DK, De Giorgio V, Greaves J, Penner RM, Cioffi N. Laser Desorption Ionization-Mass Spectrometry Detection of Amino Acids and Peptides Promoted by Gold Nanowires. ACTA ACUST UNITED AC 2010. [DOI: 10.1166/sl.2010.1308] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Cioffi N, Colaianni L, Pilolli R, Calvano CD, Palmisano F, Zambonin PG. Silver nanofractals: electrochemical synthesis, XPS characterization and application in LDI-MS. Anal Bioanal Chem 2009; 394:1375-83. [DOI: 10.1007/s00216-009-2820-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2009] [Accepted: 04/21/2009] [Indexed: 11/28/2022]
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11
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Cioffi N, De Palo F, Calvano CD, van der Werf ID, Palmisano F, Zambonin PG. Core–Shell Gold Nanoparticles as Non-Conventional Matrix for the MALDI-ToF-MS Detection of Amino Acids: A Preliminary Study. ACTA ACUST UNITED AC 2008. [DOI: 10.1166/sl.2008.454] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Ieva E, Buchholt K, Colaianni L, Cioffi N, Sabbatini L, Capitani GC, Lloyd Spetz A, Kall PO, Torsi L. Au Nanoparticles as Gate Material for NO x Field Effect Capacitive Sensors. ACTA ACUST UNITED AC 2008. [DOI: 10.1166/sl.2008.433] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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De Giglio E, Cometa S, Cioffi N, Torsi L, Sabbatini L. Analytical investigations of poly(acrylic acid) coatings electrodeposited on titanium-based implants: a versatile approach to biocompatibility enhancement. Anal Bioanal Chem 2007; 389:2055-63. [PMID: 17516054 DOI: 10.1007/s00216-007-1299-7] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2007] [Revised: 04/04/2007] [Accepted: 04/05/2007] [Indexed: 11/27/2022]
Abstract
A polyacrylic acid film was synthesized on titanium substrates from aqueous solutions via an electroreductive process for the first time. This work was done in order to develop a versatile coating for titanium-based orthopaedic implants that acts as both an effective bioactive surface and an effective anti-corrosion barrier. The chemical structure of the PAA coating was investigated by X-ray photoelectron spectroscopy (XPS). Scanning electron microscopy (SEM) was employed to evaluate the effect of annealing treatment on the morphology of the coatings in terms of their uniformity and porosity. Inductively coupled plasma mass spectrometry was used to measure ion concentrations in ion release tests performed on Ti-6Al-4V sheets modified with PAA coatings (annealed and unannealed). Results indicate that the annealing process produces coatings that possess considerable anti-corrosion performance. Moreover, the availability and the reactivity of the surface carboxylic groups were exploited in order to graft biological molecules onto the PAA-modified titanium implants. The feasibility of the grafting reaction was tested using a single aminoacid residue. A fluorinated aminoacid was selected, and the grafting reaction was monitored both by XPS, using fluorine as a marker element, and via quartz crystal microbalance (QCM) measurements. The success of the grafting reaction opens the door to the synthesis of a wide variety of PAA-based coatings that are functionalized with selected bioactive molecules and promote positive reactions with the biological system interfacing the implant while considerably reducing ion release into surrounding tissues.
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Affiliation(s)
- E De Giglio
- Department of Chemistry, University of Bari, Via E. Orabona 4, 70126, Bari, Italy.
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14
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Cioffi N, Ditaranto N, Torsi L, Picca RA, De Giglio E, Sabbatini L, Novello L, Tantillo G, Bleve-Zacheo T, Zambonin PG. Synthesis, analytical characterization and bioactivity of Ag and Cu nanoparticles embedded in poly-vinyl-methyl-ketone films. Anal Bioanal Chem 2005; 382:1912-8. [PMID: 16032425 DOI: 10.1007/s00216-005-3334-x] [Citation(s) in RCA: 123] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2005] [Revised: 05/10/2005] [Accepted: 05/19/2005] [Indexed: 11/25/2022]
Abstract
The electrosynthesis of copper and silver core-shell nanoparticles (NPs) by the sacrificial anode technique, employing tetraoctylammonium (TOA) salts as base electrolyte for the first time, is described. These surfactants were selected because they combine high NP stabilizing power with useful disinfecting properties. The resulting colloids were mixed with a solution of an inert dispersing polymer and used to prepare nanostructured composite thin films. The morphologies and chemical compositions of the nanomaterials were characterized by Transmission Electron Microscopy (TEM) and X-ray Photoelectron Spectroscopy (XPS). The TEM reveals that the average core diameter of the metal NPs ranges between 1.7 and 6.3 nm, as a function of the nature of the metal and of the electrosynthesis conditions, and does not change significantly upon inclusion in the polymer matrix. An appreciable concentration of the metal is detected on the nanoparticle surface by XPS. High-resolution XP spectra indicate that both copper and silver are present at zero oxidation state in all of the materials (colloids and composite films). This demonstrates the high efficiency of the surfactant at controlling the morphology and the chemical composition of the nanodispersed metal in both the as-synthesized colloid and in the polymeric dispersion. The nanocoatings are shown to exert a marked inhibitory effect on the growth of eukaryote and prokaryote target microrganisms, and experimental evidence of a synergic disinfecting effect due to the surfactant and the nanodispersed metal is provided. On the basis of these stability and bioactivity results, it is clear that Cu-NPs and Ag-NPs are suitable for application in disinfecting or antifouling paint and coating formulations.
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Affiliation(s)
- N Cioffi
- Dipartimento di Chimica, Università degli Studi di Bari, via Orabona 4, 70126 Bari, Italy.
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Cioffi N, Ditaranto N, Torsi L, Picca RA, Sabbatini L, Valentini A, Novello L, Tantillo G, Bleve-Zacheo T, Zambonin PG. Analytical characterization of bioactive fluoropolymer ultra-thin coatings modified by copper nanoparticles. Anal Bioanal Chem 2004; 381:607-16. [PMID: 15349710 DOI: 10.1007/s00216-004-2761-4] [Citation(s) in RCA: 131] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2004] [Revised: 07/02/2004] [Accepted: 07/06/2004] [Indexed: 11/30/2022]
Abstract
Copper-fluoropolymer (Cu-CFx) nano-composite films are deposited by dual ion-beam sputtering. The extensive analytical characterization of these layers reveals that inorganic nanoparticles composed of Cu(II) species are evenly dispersed in a branched fluoropolymer matrix. In particular, X-ray photoelectron spectroscopy has been employed to study the surface chemical composition of the material and to assess how it changes on increasing the copper loading in the composite. Transmission electron microscopy reveals that the copper nanoclusters have a mean diameter of 2-3 nm and are homogeneously in-plane distributed in the composite films. Electrothermal atomic absorption spectroscopy has been used to study the kinetics of copper release in the solutions employed for the biological tests. The Cu-CFx layers are employed as bioactive coatings capable of inhibiting the growth of target microorganisms such as Saccharomyces cerevisiae, Escherichia coli, Staphylococcus aureus, and Lysteria. The results of the analytical characterization enable a strict correlation to be established among the chemical composition of the material surface, the concentration of copper dissolved in the microorganisms broths, and the bioactivity of the nano-structured layer.
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Affiliation(s)
- N Cioffi
- Dipartimento di Chimica, Università degli Studi di Bari, via Orabona 4, 70126, Bari, Italy.
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16
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Torsi L, Tanese MC, Cioffi N, Gallazzi MC, Sabbatini L, Zambonin PG, Raos G, Meille SV, Giangregorio MM. Side-Chain Role in Chemically Sensing Conducting Polymer Field-Effect Transistors. J Phys Chem B 2003. [DOI: 10.1021/jp0344951] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- L. Torsi
- Dipartimento di Chimica and Centro di Eccellenza T.I.R.E.S., Università degli Studi di Bari, 4, via Orabona I-70126 - Bari, Italy, Dipartimento di Chimica Industriale e Ingegneria Chimica, Politecnico di Milano, Italy, and Istituto di Metodologie Inorganiche e dei Plasmi, IMIP, CNR, Bari, Italy
| | - M. C. Tanese
- Dipartimento di Chimica and Centro di Eccellenza T.I.R.E.S., Università degli Studi di Bari, 4, via Orabona I-70126 - Bari, Italy, Dipartimento di Chimica Industriale e Ingegneria Chimica, Politecnico di Milano, Italy, and Istituto di Metodologie Inorganiche e dei Plasmi, IMIP, CNR, Bari, Italy
| | - N. Cioffi
- Dipartimento di Chimica and Centro di Eccellenza T.I.R.E.S., Università degli Studi di Bari, 4, via Orabona I-70126 - Bari, Italy, Dipartimento di Chimica Industriale e Ingegneria Chimica, Politecnico di Milano, Italy, and Istituto di Metodologie Inorganiche e dei Plasmi, IMIP, CNR, Bari, Italy
| | - M. C. Gallazzi
- Dipartimento di Chimica and Centro di Eccellenza T.I.R.E.S., Università degli Studi di Bari, 4, via Orabona I-70126 - Bari, Italy, Dipartimento di Chimica Industriale e Ingegneria Chimica, Politecnico di Milano, Italy, and Istituto di Metodologie Inorganiche e dei Plasmi, IMIP, CNR, Bari, Italy
| | - L. Sabbatini
- Dipartimento di Chimica and Centro di Eccellenza T.I.R.E.S., Università degli Studi di Bari, 4, via Orabona I-70126 - Bari, Italy, Dipartimento di Chimica Industriale e Ingegneria Chimica, Politecnico di Milano, Italy, and Istituto di Metodologie Inorganiche e dei Plasmi, IMIP, CNR, Bari, Italy
| | - P. G. Zambonin
- Dipartimento di Chimica and Centro di Eccellenza T.I.R.E.S., Università degli Studi di Bari, 4, via Orabona I-70126 - Bari, Italy, Dipartimento di Chimica Industriale e Ingegneria Chimica, Politecnico di Milano, Italy, and Istituto di Metodologie Inorganiche e dei Plasmi, IMIP, CNR, Bari, Italy
| | - G. Raos
- Dipartimento di Chimica and Centro di Eccellenza T.I.R.E.S., Università degli Studi di Bari, 4, via Orabona I-70126 - Bari, Italy, Dipartimento di Chimica Industriale e Ingegneria Chimica, Politecnico di Milano, Italy, and Istituto di Metodologie Inorganiche e dei Plasmi, IMIP, CNR, Bari, Italy
| | - S. V. Meille
- Dipartimento di Chimica and Centro di Eccellenza T.I.R.E.S., Università degli Studi di Bari, 4, via Orabona I-70126 - Bari, Italy, Dipartimento di Chimica Industriale e Ingegneria Chimica, Politecnico di Milano, Italy, and Istituto di Metodologie Inorganiche e dei Plasmi, IMIP, CNR, Bari, Italy
| | - M. M. Giangregorio
- Dipartimento di Chimica and Centro di Eccellenza T.I.R.E.S., Università degli Studi di Bari, 4, via Orabona I-70126 - Bari, Italy, Dipartimento di Chimica Industriale e Ingegneria Chimica, Politecnico di Milano, Italy, and Istituto di Metodologie Inorganiche e dei Plasmi, IMIP, CNR, Bari, Italy
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Cioffi N, Torsi L, Losito I, Sabbatini L, Zambonin P, Bleve-Zacheo T. Nanostructured palladium–polypyrrole composites electrosynthesised from organic solvents. Electrochim Acta 2001. [DOI: 10.1016/s0013-4686(01)00700-9] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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18
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Cioffi N, Losito I, Terzano R, Zambonin CG. An electrospray ionization ion trap mass spectrometric (ESI-MS-MSn) study of dehydroascorbic acid hydrolysis at neutral pH. Analyst 2000; 125:2244-8. [PMID: 11219060 DOI: 10.1039/b007299k] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The hydrolysis of dehydroascorbic acid (DAAH) at neutral pH and 27 degrees C was investigated by direct infusion electrospray ionisation ion trap mass spectrometry (ESI-MS). This approach permitted derivatisation and elution procedures to be avoided, reducing to the minimum extent sample manipulation and allowing a rapid and direct observation of the species involved in the reaction. Six main peaks, related to hydrated dehydroascorbate (HyDAA-) and diketogulonate (HyDKG-) anions, were observed in the mass spectra of DAAH solutions at different times of incubation and were characterised by MSn experiments. The relevant signal intensities changed with time and a model, based on the irreversible pseudo-first order HyDAA(-)-->HyDKG- conversion, fitted successfully the data obtained for dehydroascorbate. The kinetic constant of the process was (3.2 +/- 0.5) x 10(-2) min-1. The influence of metal ion traces on the hydrolysis rate was also checked, performing experiments in the presence of EDTA, and was found to be negligible.
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Affiliation(s)
- N Cioffi
- Dipartimento di Chimica, Università degli Studi di Bari, 4 via E. Orabona, I-70126 Bari, Italy.
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