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Giordano ME, Udayan G, Guascito MR, De Bartolomeo AR, Carlino A, Conte M, Contini D, Lionetto MG. Apoptotic volume decrease (AVD) in A 549 cells exposed to water-soluble fraction of particulate matter (PM 10). Front Physiol 2023; 14:1218687. [PMID: 37492639 PMCID: PMC10364053 DOI: 10.3389/fphys.2023.1218687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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] [Received: 05/07/2023] [Accepted: 06/21/2023] [Indexed: 07/27/2023] Open
Abstract
Exposure to atmospheric particulate matter (PM) is recognized as a human health risk factor of great concern. The present work aimed to study the cellular mechanisms underlying cytotoxic effects of airborne particulate matter <10 µm in size (PM10), sampled in an urban background site from January to May 2020, on A549 cells. In particular, the study addressed if PM10 exposure can be a main factor in the induction of the Apoptotic Volume Decrease (AVD), which is one of the first events of apoptosis, and if the generation of intracellular oxidative stress can be involved in the PM10 induction of apoptosis in A549 cells. The cytotoxicity of PM10 samples was measured by MTT test on cells exposed for 24 h to the PM10 aqueous extracts, cell volume changes were monitored by morphometric analysis of the cells, apoptosis appearance was detected by annexin V and the induction of intracellular oxidative stress was evaluated by the ROS sensitive CM-H2DCFDA fluorescent probe. The results showed cytotoxic effects ascribable to apoptotic death in A549 cells exposed for 24 h to aqueous extracts of airborne winter PM10 samples characterized by high PM10 value and organic carbon content. The detected reduced cell viability in winter samples ranged from 55% to 100%. Normotonic cell volume reduction (ranging from about 60% to 30% cell volume decrease) after PM10 exposure was already detectable after the first 30 min clearly indicating the ability of PM10, mainly arising from biomass burning, to induce Apoptotic Volume Decrease (AVD) in A549 cells. AVD was prevented by the pre-treatment with 0.5 mM SITS indicating the activation of Cl- efflux presumably through the activation of VRAC channels. The exposure of A549 cells to PM10 aqueous extracts was able to induce intracellular oxidative stress detected by using the ROS-sensitive probe CM-H2DCFDA. The PM10-induced oxidative stress was statistically significantly correlated with cell viability inhibition and with apoptotic cell shrinkage. It was already evident after 15 min exposure representing one of the first cellular effects caused by PM exposure. This result suggests the role of oxidative stress in the PM10 induction of AVD as one of the first steps in cytotoxicity.
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Affiliation(s)
- M E Giordano
- Department Biological and Environmental Sciences and Technologies (DiSTeBA), Salento University, Lecce, Italy
| | - G Udayan
- Department Biological and Environmental Sciences and Technologies (DiSTeBA), Salento University, Lecce, Italy
| | - M R Guascito
- Department Biological and Environmental Sciences and Technologies (DiSTeBA), Salento University, Lecce, Italy
| | - A R De Bartolomeo
- Department Biological and Environmental Sciences and Technologies (DiSTeBA), Salento University, Lecce, Italy
| | - A Carlino
- Department Biological and Environmental Sciences and Technologies (DiSTeBA), Salento University, Lecce, Italy
| | - M Conte
- Institute of Atmospheric Sciences and Climate, ISAC-CNR, Rome, Italy
| | - D Contini
- Institute of Atmospheric Sciences and Climate, ISAC-CNR, Lecce, Italy
| | - M G Lionetto
- Department Biological and Environmental Sciences and Technologies (DiSTeBA), Salento University, Lecce, Italy
- NBFC, National Biodiversity Future Center, Palermo, Italy
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Guascito MR, Lionetto MG, Mazzotta F, Conte M, Giordano ME, Caricato R, De Bartolomeo AR, Dinoi A, Cesari D, Merico E, Mazzotta L, Contini D. Characterisation of the correlations between oxidative potential and in vitro biological effects of PM 10 at three sites in the central Mediterranean. J Hazard Mater 2023; 448:130872. [PMID: 36716558 DOI: 10.1016/j.jhazmat.2023.130872] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [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: 08/03/2022] [Revised: 12/09/2022] [Accepted: 01/24/2023] [Indexed: 06/18/2023]
Abstract
Atmospheric particulate matter (PM) is one of the major risks for global health. The exact mechanisms of toxicity are still not completely understood leading to contrasting results when different toxicity metrics are compared. In this work, PM10 was collected at three sites for the determination of acellular oxidative potential (OP), intracellular oxidative stress (OSGC), cytotoxicity (MTT assay), and genotoxicity (Comet assay). The in vitro tests were done on the A549 cell line. The objective was to investigate the correlations among acellular and intracellular toxicity indicators, the variability among the sites, and how these correlations were influenced by the main sources by using PMF receptor model coupled with MLR. The OPDTTV, OSGCV, and cytotoxicity were strongly influenced by combustion sources. Advection of African dust led to lower-than-average intrinsic toxicity indicators. OPDTTV and OSGCV showed site-dependent correlations suggesting that acellular OP may not be fully representative of the intracellular oxidative stress at all sites and conditions. Cytotoxicity correlated with both OPDTTV and OSGCV at two sites out of three and the strength of the correlation was larger with OSGCV. Genotoxicity was correlated with cytotoxicity at all sites and correlated with both, OPDTTV and OSGCV, at two sites out of three. Results suggest that several toxicity indicators are useful to gain a global picture of the potential health effects of PM.
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Affiliation(s)
- Maria Rachele Guascito
- Department of Environmental and Biological Sciences and Technologies (DISTEBA), University of Salento, Lecce 73100, Italy; Institute of Atmospheric Sciences and Climate, ISAC-CNR, Str. Prv. Lecce-Monteroni km 1.2, 73100 Lecce, Italy
| | - Maria Giulia Lionetto
- Department of Environmental and Biological Sciences and Technologies (DISTEBA), University of Salento, Lecce 73100, Italy
| | - Franco Mazzotta
- Studio Effemme Chimica Applicata, s.r.l. Via Pio XII, 73018 Squinzano, Italy
| | - Marianna Conte
- Laboratory for Observations and Analyses of Earth and Climate, Agenzia Nazionale per le Nuove Tecnologie, l'Energia e lo Sviluppo Economico Sostenibile (ENEA), 00123 Roma, Italy
| | - Maria Elena Giordano
- Department of Environmental and Biological Sciences and Technologies (DISTEBA), University of Salento, Lecce 73100, Italy
| | - Roberto Caricato
- Department of Environmental and Biological Sciences and Technologies (DISTEBA), University of Salento, Lecce 73100, Italy
| | - Anna Rita De Bartolomeo
- Department of Environmental and Biological Sciences and Technologies (DISTEBA), University of Salento, Lecce 73100, Italy
| | - Adelaide Dinoi
- Institute of Atmospheric Sciences and Climate, ISAC-CNR, Str. Prv. Lecce-Monteroni km 1.2, 73100 Lecce, Italy
| | - Daniela Cesari
- Institute of Atmospheric Sciences and Climate, ISAC-CNR, Str. Prv. Lecce-Monteroni km 1.2, 73100 Lecce, Italy
| | - Eva Merico
- Institute of Atmospheric Sciences and Climate, ISAC-CNR, Str. Prv. Lecce-Monteroni km 1.2, 73100 Lecce, Italy
| | - Laura Mazzotta
- Studio Effemme Chimica Applicata, s.r.l. Via Pio XII, 73018 Squinzano, Italy
| | - Daniele Contini
- Institute of Atmospheric Sciences and Climate, ISAC-CNR, Str. Prv. Lecce-Monteroni km 1.2, 73100 Lecce, Italy.
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Conte M, Dinoi A, Grasso FM, Merico E, Guascito MR, Contini D. Concentration and size distribution of atmospheric particles in southern Italy during COVID-19 lockdown period. Atmos Environ (1994) 2023; 295:119559. [PMID: 36569029 PMCID: PMC9759460 DOI: 10.1016/j.atmosenv.2022.119559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 12/05/2022] [Accepted: 12/16/2022] [Indexed: 06/17/2023]
Abstract
Many countries imposed lockdown (LD) to limit the spread of COVID-19, which led to a reduction in the emission of anthropogenic atmospheric pollutants. Several studies have investigated the effects of LD on air quality, mostly in urban settings and criteria pollutants. However, less information is available on background sites, and virtually no information is available on particle number size distribution (PNSD). This study investigated the effect of LD on air quality at an urban background site representing a near coast area in the central Mediterranean. The analysis focused on equivalent black carbon (eBC), particle mass concentrations in different size fractions: PM2.5 (aerodynamic diameter Da < 2.5 μm), PM10 (Da < 10 μm), PM10-2.5 (2.5 < Da < 10 μm); and PNSD in a wide range of diameters (0.01-10 μm). Measurements in 2020 during the national LD in Italy and period immediately after LD (POST-LD period) were compared with those in the corresponding periods from 2015 to 2019. The results showed that LD reduced the frequency and intensity of high-pollution events. Reductions were more relevant during POST-LD than during LD period for all variables, except quasi-ultrafine particles and PM10-2.5. Two events of long-range transport of dust were observed, which need to be identified and removed to determine the effect of LD. The decreases in the quasi-ultrafine particles and eBC concentrations were 20%, and 15-22%, respectively. PM2.5 concentration was reduced by 13-44% whereas PM10-2.5 concentration was unaffected. The concentration of accumulation mode particles followed the behaviour of PM2.5, with reductions of 19-57%. The results obtained could be relevant for future strategies aimed at improving air quality and understanding the processes that influence the number and mass particle size distributions.
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Affiliation(s)
- Marianna Conte
- Laboratory for Observations and Analyses of Earth and Climate, Agenzia Nazionale per le Nuove Tecnologie, l'Energia e lo Sviluppo Economico Sostenibile (ENEA), Rome, 00123, Italy
| | - Adelaide Dinoi
- Istituto di Scienze dell'Atmosfera e del Clima (ISAC), Consiglio Nazionale delle Ricerche (CNR), Str. Prv. Lecce-Monteroni km 1.2, Lecce, 73100, Italy
| | - Fabio Massimo Grasso
- Istituto di Scienze dell'Atmosfera e del Clima (ISAC), Consiglio Nazionale delle Ricerche (CNR), Str. Prv. Lecce-Monteroni km 1.2, Lecce, 73100, Italy
| | - Eva Merico
- Istituto di Scienze dell'Atmosfera e del Clima (ISAC), Consiglio Nazionale delle Ricerche (CNR), Str. Prv. Lecce-Monteroni km 1.2, Lecce, 73100, Italy
| | - Maria Rachele Guascito
- Istituto di Scienze dell'Atmosfera e del Clima (ISAC), Consiglio Nazionale delle Ricerche (CNR), Str. Prv. Lecce-Monteroni km 1.2, Lecce, 73100, Italy
- Dipartimento DISTEBA, Università del Salento, Via per Arnesano, Lecce, 73100, Italy
| | - Daniele Contini
- Istituto di Scienze dell'Atmosfera e del Clima (ISAC), Consiglio Nazionale delle Ricerche (CNR), Str. Prv. Lecce-Monteroni km 1.2, Lecce, 73100, Italy
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Besis A, Romano MP, Serafeim E, Avgenikou A, Kouras A, Lionetto MG, Guascito MR, De Bartolomeo AR, Giordano ME, Mangone A, Contini D, Samara C. Size-Resolved Redox Activity and Cytotoxicity of Water-Soluble Urban Atmospheric Particulate Matter: Assessing Contributions from Chemical Components. Toxics 2023; 11:59. [PMID: 36668785 PMCID: PMC9867266 DOI: 10.3390/toxics11010059] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 01/03/2023] [Accepted: 01/05/2023] [Indexed: 06/17/2023]
Abstract
Throughout the cold and the warm periods of 2020, chemical and toxicological characterization of the water-soluble fraction of size segregated particulate matter (PM) (<0.49, 0.49−0.95, 0.95−1.5, 1.5−3.0, 3.0−7.2 and >7.2 μm) was conducted in the urban agglomeration of Thessaloniki, northern Greece. Chemical analysis of the water-soluble PM fraction included water-soluble organic carbon (WSOC), humic-like substances (HULIS), and trace elements (V, Cr, Mn, Fe, Ni, Cu, Zn, As, Cd and Pb). The bulk (sum of all size fractions) concentrations of HULIS were 2.5 ± 0.5 and 1.2 ± 0.3 μg m−3, for the cold and warm sampling periods, respectively with highest values in the <0.49 μm particle size fraction. The total HULIS-C/WSOC ratio ranged from 17 to 26% for all sampling periods, confirming that HULIS are a significant part of WSOC. The most abundant water-soluble metals were Fe, Zn, Cu, and Mn. The oxidative PM activity was measured abiotically using the dithiothreitol (DTT) assay. In vitro cytotoxic responses were investigated using mitochondrial dehydrogenase (MTT). A significant positive correlation was found between OPmDTT, WSOC, HULIS and the MTT cytotoxicity of PM. Multiple Linear Regression (MLR) showed a good relationship between OPMDTT, HULIS and Cu.
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Affiliation(s)
- Athanasios Besis
- Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
| | - Maria Pia Romano
- Department of Mathematics and Physics, University of Salento, 73100 Lecce, Italy
| | - Eleni Serafeim
- Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
| | - Anna Avgenikou
- Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
| | - Athanasios Kouras
- Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
| | - Maria Giulia Lionetto
- Department of Biological and Environmental Sciences and Technologies, University of Salento, 73100 Lecce, Italy
| | - Maria Rachele Guascito
- Department of Biological and Environmental Sciences and Technologies, University of Salento, 73100 Lecce, Italy
- Institute of Atmospheric Sciences and Climate (CNR-ISAC), 73100 Lecce, Italy
| | - Anna Rita De Bartolomeo
- Department of Biological and Environmental Sciences and Technologies, University of Salento, 73100 Lecce, Italy
| | - Maria Elena Giordano
- Department of Biological and Environmental Sciences and Technologies, University of Salento, 73100 Lecce, Italy
| | - Annarosa Mangone
- Department of Chemistry, University of Bari Aldo Moro, 70124 Bari, Italy
| | - Daniele Contini
- Institute of Atmospheric Sciences and Climate (CNR-ISAC), 73100 Lecce, Italy
| | - Constantini Samara
- Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
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Giannossa LC, Cesari D, Merico E, Dinoi A, Mangone A, Guascito MR, Contini D. Inter-annual variability of source contributions to PM 10, PM 2.5, and oxidative potential in an urban background site in the central mediterranean. J Environ Manage 2022; 319:115752. [PMID: 35982560 DOI: 10.1016/j.jenvman.2022.115752] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [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: 03/16/2022] [Revised: 07/04/2022] [Accepted: 07/10/2022] [Indexed: 06/15/2023]
Abstract
Airborne particulate matter (PM) is studied because of its effects on human health and climate change. PM long-term characterisation allows identifying trends and evaluating the outcomes of environmental protection policies. This work is aimed to study the inter-annual variability of PM2.5 and PM10 concentrations and chemical composition in an urban background site (Italy). A dataset of daily PM2.5 and PM10 was collected in the period 2016-2017, including the content of OC, EC, major water-soluble ions, main metals, and compared to a similar dataset collected in the period 2013-2014. Oxidative potential using DTT assay (dithiothreitol) was evaluated and expressed in DTTV as 0.39 nmol/min·m3 in PM10 and 0.29 in PM2.5 nmol/min·m3. PM source apportionment was computed using the EPA PMF5.0 model and source contributions compared with those of a previous dataset collected between 2013 and 2014. Multi linear regression analysis identified which source contributed (p < 0.05) to the oxidative potential of each size fraction. Inter-annual trends were more evident on PM2.5 with reductions of biomass burning contribution and increases in traffic contribution in the 2016-2017 period. Crustal contributions were similar for the two periods, in both size fractions. Carbonates were comparable in PM10 with a slight increase in PM2.5. Sea spray decreased in PM10. The DTTV of PM2.5 peaked during cold periods, while, the DTTV of the PM10-2.5 fraction peaked in summer, suggesting that different sources, with different seasonality, influence OP in the PM2.5 and PM10-2.5 fractions. Analysis showed that sea spray, crustal, and carbonates sources contribute ∼13.6% to DTTV in PM2.5 and ∼62.4% to DTTV in PM10-2.5. Combustion sources (biomass burning and traffic) contribute to the majority of DTTV (50.6%) in PM2.5 and contribute for ∼26% to DTTV in PM10-2.5. Secondary nitrate contributes to DTTV in both fine and coarse fraction; secondary sulphate contribute to DTTV in PM2.5 with negligible contributions to DTTV in PM10-2.5.
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Affiliation(s)
| | - Daniela Cesari
- Italy National Research Council of Italy, Institute of Atmospheric Sciences and Climate (CNR-ISAC), Lecce, 73100, Italy.
| | - Eva Merico
- Italy National Research Council of Italy, Institute of Atmospheric Sciences and Climate (CNR-ISAC), Lecce, 73100, Italy
| | - Adelaide Dinoi
- Italy National Research Council of Italy, Institute of Atmospheric Sciences and Climate (CNR-ISAC), Lecce, 73100, Italy
| | - Annarosa Mangone
- University of Bari Aldo Moro, Department of Chemistry, I-70125, Bari, Italy
| | - Maria Rachele Guascito
- Italy National Research Council of Italy, Institute of Atmospheric Sciences and Climate (CNR-ISAC), Lecce, 73100, Italy; Department of Environmental and Biological Sciences and Technologies (DISTEBA), University of Salento, Lecce, 73100, Italy
| | - Daniele Contini
- Italy National Research Council of Italy, Institute of Atmospheric Sciences and Climate (CNR-ISAC), Lecce, 73100, Italy
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Romano MP, Lionetto MG, Mangone A, De Bartolomeo AR, Giordano ME, Contini D, Guascito MR. Development and characterization of a gold nanoparticles glassy carbon modified electrode for dithiotreitol (DTT) detection suitable to be applied for determination of atmospheric particulate oxidative potential. Anal Chim Acta 2022; 1206:339556. [DOI: 10.1016/j.aca.2022.339556] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 01/20/2022] [Accepted: 01/24/2022] [Indexed: 11/01/2022]
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Pagliara P, Chirizzi D, Guascito MR. Chemical characterization of red cells from the black sea urchin Arbacia lixula by X-ray photoelectron spectroscopy. RSC Adv 2021; 11:27074-27083. [PMID: 35480024 PMCID: PMC9037641 DOI: 10.1039/d1ra03156b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Accepted: 07/23/2021] [Indexed: 12/28/2022] Open
Abstract
Red spherula cells (RSC) from sea urchin coelomic fluid have attracted great interest for their specific and intriguing properties, such as for example antimicrobial activities and immune response, that probably tie in with their red characteristic pigments. Although to date different studies have been reported aimed to chemically characterize their pigments extracted from the cells, few data are available about the chemical characterization of the cell surface. In this work, a systematic chemical characterization of the RSC surface by X-ray photoelectron spectroscopy (XPS) analysis is described. The results were compared with data on colorless cells from the same coelomic fluid sample. Our observations evidenced that the two cell types were characterized by the presence of different chemical functional groups. In particular, the colorless cells are dominated by the presence of alkyl, alcohol, amide, and carboxyl groups in accordance with other similar cell types, enriched in Na+ and Cl− ions. Traces of elements like S (sulphonates) and P (phosphates) are also present. On the other hand, the RSC in addition to the alkyl groups show a reduction in the content of amide groups, accompanied by the anomalous presence of keto-enolic groups that probably can be associated with the presence of quinones/hydro-quinones from red pigments. A chemical enrichment in elements such as Cl− and Mg2+ and sulphate groups (–R–O–SO3−), as well as the presence of sulphides and phosphates traces, is evident. The absence of carbonate groups is also observed in both cell populations, confirming the absence of sodium and magnesium carbonate salts. No traces of toxic elements (i.e., heavy metals) have been revealed. Red spherula cells from sea urchin coelomic fluid have attracted great interest for their specific and intriguing properties, such as antimicrobial activities and immune response, that probably tie in with their red characteristic pigments.![]()
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Affiliation(s)
- Patrizia Pagliara
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Università del Salento S.P. Lecce-Monteroni Lecce Italy
| | - Daniela Chirizzi
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata (IZS_PB) Via Manfredonia 20 Foggia Italy
| | - Maria Rachele Guascito
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Università del Salento S.P. Lecce-Monteroni Lecce Italy
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Milano F, Guascito MR, Semeraro P, Sawalha S, Da Ros T, Operamolla A, Giotta L, Prato M, Valli L. Nanocellulose/Fullerene Hybrid Films Assembled at the Air/Water Interface as Promising Functional Materials for Photo-electrocatalysis. Polymers (Basel) 2021; 13:243. [PMID: 33445737 PMCID: PMC7828161 DOI: 10.3390/polym13020243] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 01/03/2021] [Accepted: 01/09/2021] [Indexed: 01/04/2023] Open
Abstract
Cellulose nanomaterials have been widely investigated in the last decade, unveiling attractive properties for emerging applications. The ability of sulfated cellulose nanocrystals (CNCs) to guide the supramolecular organization of amphiphilic fullerene derivatives at the air/water interface has been recently highlighted. Here, we further investigated the assembly of Langmuir hybrid films that are based on the electrostatic interaction between cationic fulleropyrrolidines deposited at the air/water interface and anionic CNCs dispersed in the subphase, assessing the influence of additional negatively charged species that are dissolved in the water phase. By means of isotherm acquisition and spectroscopic measurements, we demonstrated that a tetra-sulfonated porphyrin, which was introduced in the subphase as anionic competitor, strongly inhibited the binding of CNCs to the floating fullerene layer. Nevertheless, despite the strong inhibition by anionic molecules, the mutual interaction between fulleropyrrolidines at the interface and the CNCs led to the assembly of robust hybrid films, which could be efficiently transferred onto solid substrates. Interestingly, ITO-electrodes that were modified with five-layer hybrid films exhibited enhanced electrical capacitance and produced anodic photocurrents at 0.4 V vs Ag/AgCl, whose intensity (230 nA/cm2) proved to be four times higher than the one that was observed with the sole fullerene derivative (60 nA/cm2).
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Affiliation(s)
- Francesco Milano
- Istituto di Scienze delle Produzioni Alimentari (ISPA), Consiglio Nazionale delle Ricerche (CNR), S.P. Lecce-Monteroni, Ecotekne, 73100 Lecce, Italy;
| | - Maria Rachele Guascito
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Università del Salento, S.P. Lecce-Monteroni, 73100 Lecce, Italy; (M.R.G.); (P.S.); (L.V.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Unità di Lecce, S.P. Lecce-Monteroni, 73100 Lecce, Italy
| | - Paola Semeraro
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Università del Salento, S.P. Lecce-Monteroni, 73100 Lecce, Italy; (M.R.G.); (P.S.); (L.V.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Unità di Lecce, S.P. Lecce-Monteroni, 73100 Lecce, Italy
| | - Shadi Sawalha
- Dipartimento di Ingegneria dell’Innovazione, Università del Salento, S.P. Lecce-Monteroni, 73100 Lecce, Italy;
- Department of Chemical Engineering, An-Najah National University, P.O. Box 7, Nablus 00970, Palestine
| | - Tatiana Da Ros
- Center of Excellence for Nanostructured Materials (CENMAT) and INSTM, Unit of Trieste, Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Trieste, via Giorgieri 1, 34127 Trieste, Italy; (T.D.R.); (M.P.)
| | - Alessandra Operamolla
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi 13, 56124 Pisa, Italy
| | - Livia Giotta
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Università del Salento, S.P. Lecce-Monteroni, 73100 Lecce, Italy; (M.R.G.); (P.S.); (L.V.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Unità di Lecce, S.P. Lecce-Monteroni, 73100 Lecce, Italy
| | - Maurizio Prato
- Center of Excellence for Nanostructured Materials (CENMAT) and INSTM, Unit of Trieste, Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Trieste, via Giorgieri 1, 34127 Trieste, Italy; (T.D.R.); (M.P.)
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramón 182, 20014 Donostia San Sebastián, Spain
- Basque Foundation for Science, Ikerbasque, 48013 Bilbao, Spain
| | - Ludovico Valli
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Università del Salento, S.P. Lecce-Monteroni, 73100 Lecce, Italy; (M.R.G.); (P.S.); (L.V.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Unità di Lecce, S.P. Lecce-Monteroni, 73100 Lecce, Italy
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Cataldo R, Giotta L, Guascito MR, Alfinito E. Assessing the Quality of in Silico Produced Biomolecules: The Discovery of a New Conformer. J Phys Chem B 2019; 123:1265-1273. [PMID: 30642170 DOI: 10.1021/acs.jpcb.8b11456] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The computational procedures for predicting the 3D structure of aptamers interacting with different biological molecules have gained increasing attention in recent years. The information acquired through these methods represents a crucial input for research, especially when relevant crystallographic data are not available. A number of software programs able to perform macromolecular docking are currently accessible, leading to the prediction of the quaternary structure of complexes formed by two or more interacting biological macromolecules. Nevertheless, the scoring protocols employed for ranking the candidate structures do not always produce satisfactory results, making difficult the identification of structures that are most likely to occur in nature. In this paper, we propose a novel procedure to improve the predictive performances of computational scoring protocols, using a maximum likelihood estimate based on topological and electrical properties of interacting biomolecules. The reliability of the new computational approach, enabling the ranking of aptamer-protein configurations produced by an open source docking program, has been assessed by its successful application to a set of antiangiopoietin aptamers, for which experimental data highlighting the sequence-dependent affinity toward the target protein are available. The procedure led to the identification of two main types of aptamer conformers involved in angiopoietin binding. Interestingly, one of these reproduces the arrangement of angiopoietin with its natural target, tyrosine kinase, while the other one is completely unexpected. The possible scenarios related to these results have been discussed. The methodology here described can be used to refine the outcomes of different computational procedures and can be applied to a wide range of biological molecules, thus representing a new tool for guiding the design of bioinspired sensors with enhanced selectivity.
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Affiliation(s)
- R Cataldo
- Department of Mathematics and Physics, "Ennio De Giorgi" , University of Salento , Via Monteroni , I-73100 Lecce , Italy
| | - L Giotta
- Department of Biological and Environmental Sciences and Technologies , University of Salento , Via Monteroni , I-73100 Lecce , Italy
| | - M R Guascito
- Department of Biological and Environmental Sciences and Technologies , University of Salento , Via Monteroni , I-73100 Lecce , Italy
| | - E Alfinito
- Department of Innovation Engineering , University of Salento , Via Monteroni , I-73100 Lecce , Italy
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Milano F, Giotta L, Chirizzi D, Papazoglou S, Kryou C, De Bartolomeo A, De Leo V, Guascito MR, Zergioti I. Phosphate Modified Screen Printed Electrodes by LIFT Treatment for Glucose Detection. Biosensors (Basel) 2018; 8:bios8040091. [PMID: 30332738 PMCID: PMC6316885 DOI: 10.3390/bios8040091] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 09/13/2018] [Accepted: 10/12/2018] [Indexed: 11/21/2022]
Abstract
The design of new materials as active layers is important for electrochemical sensor and biosensor development. Among the techniques for the modification and functionalization of electrodes, the laser induced forward transfer (LIFT) has emerged as a powerful physisorption method for the deposition of various materials (even labile materials like enzymes) that results in intimate and stable contact with target surface. In this work, Pt, Au, and glassy carbon screen printed electrodes (SPEs) treated by LIFT with phosphate buffer have been characterized by scanning electron microscopy and atomic force microscopy to reveal a flattening effect of all surfaces. The electrochemical characterization by cyclic voltammetry shows significant differences depending on the electrode material. The electroactivity of Au is reduced while that of glassy carbon and Pt is greatly enhanced. In particular, the electrochemical behavior of a phosphate LIFT treated Pt showed a marked enrichment of hydrogen adsorbed layer, suggesting an elevated electrocatalytic activity towards glucose oxidation. When Pt electrodes modified in this way were used as an effective glucose sensor, a 1–10 mM linear response and a 10 µM detection limit were obtained. A possible role of phosphate that was securely immobilized on a Pt surface, as evidenced by XPS analysis, enhancing the glucose electrooxidation is discussed.
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Affiliation(s)
- Francesco Milano
- Istituto per i Processi Chimico Fisici, UOS Bari, Via Orabona 4, 70126 Bari, Italy.
| | - Livia Giotta
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Università del Salento, S.P. Lecce-Monteroni, 73100 Lecce, Italy.
| | - Daniela Chirizzi
- IZS Puglia e Basilicata, U.O. Putignano. Via Chiancolla 1, C.da. S. Pietro Piturno, 70017 Putignano (BA), Italy.
| | - Simos Papazoglou
- Department of Physics, National Technical University of Athens, Iroon Polytehneiou 9, Zografou, 15780 Athens, Greece.
| | - Christina Kryou
- Department of Physics, National Technical University of Athens, Iroon Polytehneiou 9, Zografou, 15780 Athens, Greece.
| | - Annarita De Bartolomeo
- Dipartimento di Beni Culturali, Università del Salento, S.P. Lecce-Monteroni, 73100 Lecce, Italy.
| | - Vincenzo De Leo
- Istituto per i Processi Chimico Fisici, UOS Bari, Via Orabona 4, 70126 Bari, Italy.
- Dipartimento di Chimica, Università di Bari "Aldo Moro", Via Orabona 4, 70125 Bari, Italy.
| | - Maria Rachele Guascito
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Università del Salento, S.P. Lecce-Monteroni, 73100 Lecce, Italy.
- IZS Puglia e Basilicata, U.O. Putignano. Via Chiancolla 1, C.da. S. Pietro Piturno, 70017 Putignano (BA), Italy.
| | - Ioanna Zergioti
- Department of Physics, National Technical University of Athens, Iroon Polytehneiou 9, Zografou, 15780 Athens, Greece.
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Guascito MR, Ricciardi G, Rosa A. Nickel-macrocycle interaction in nickel(II) porphyrins and porphyrazines bearing alkylthio β-substituents: A combined DFT and XPS study. J PORPHYR PHTHALOCYA 2017. [DOI: 10.1142/s1088424617500328] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
An electronic structure analysis of two nickel(II) tetrapyrrole complexes bearing β-alkylthio substituents, NiOMTP and NiOETPz, has been carried out through a combination of high-resolution XPS experiments and DFT calculations. The Ni 2p XPS spectra show a 0.5 eV shift to higher energy of the Ni 2p[Formula: see text] and Ni 2p[Formula: see text] binding energies on going from the porphyrin to the porphyrazine complex. This shift, which is well-reproduced by relativistic spin-orbit ZORA calculations, is indicative of a depletion of electron density on the central metal. Such a depletion of electron density is related to the macrocycle-induced changes in the metal-ligand interactions. In the porphyrazine complex both the ligand to metal [Formula: see text] donation and the metal to ligand [Formula: see text]-back donation increase. The latter increases slightly more than the former, however, leading to a decrease of electron density on the central metal.
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Affiliation(s)
- Maria Rachele Guascito
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Università del Salento, 73100 Lecce, Italy
- Istituto di Scienze Dell’ Atmosfera e Del Clima, ISAC-CNR, 73100 Lecce, Italy
| | - Giampaolo Ricciardi
- Scuola di Scienze Agrarie, Forestali, Alimentari, e Ambientali (SAFE), Università Della Basilicata, 85100 Potenza, Italy
| | - Angela Rosa
- Dipartimento di Scienze, Università Della Basilicata, 85100 Potenza, Italy
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Filippo E, Baldassarre F, Tepore M, Guascito MR, Chirizzi D, Tepore A. Characterization of hierarchical α-MoO 3 plates toward resistive heating synthesis: electrochemical activity of α-MoO 3/Pt modified electrode toward methanol oxidation at neutral pH. Nanotechnology 2017; 28:215601. [PMID: 28319033 DOI: 10.1088/1361-6528/aa67c9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The growth of MoO3 hierarchical plates was obtained by direct resistive heating of molybdenum foils at ambient pressure in the absence of any catalysts and templates. Plates synthesized after 60 min resistive heating typically grow in an single-crystalline orthorhombic structure that develop preferentially in the [001] direction, and are characterized by high resolution transmission electron microscopy, selected area diffraction pattern and Raman-scattering measurements. They are about 100-200 nm in thickness and a few tens of micrometers in length. As heating time proceeds to 80 min, plates of α-MoO3 form a branched structure. A more attentive look shows that primary plates formed at until 60 min could serve as substrates for the subsequent growth of secondary belts. Moreover, a full electrochemical characterization of α-MoO3 plates on platinum electrodes was done by cyclic voltammetric experiments, at pH 7 in phosphate buffer, to probe the activity of the proposed composite material as anode to methanol electro-oxidation. Reported results indicate that Pt MoO3 modified electrodes are appropriate to develop new an amperometric non-enzymatic sensor for methanol as well as to make anodes suitable to be used in direct methanol fuel cells working at neutral pH.
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Affiliation(s)
- Emanuela Filippo
- Dipartimento di Matematica e Fisica, Università del Salento, Lecce I-73100, Italy
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Alfinito E, Reggiani L, Cataldo R, De Nunzio G, Giotta L, Guascito MR. Modeling the microscopic electrical properties of thrombin binding aptamer (TBA) for label-free biosensors. Nanotechnology 2017; 28:065502. [PMID: 28050975 DOI: 10.1088/1361-6528/aa510f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Aptamers are chemically produced oligonucleotides, able to bind a variety of targets such as drugs, proteins and pathogens with high sensitivity and selectivity. Therefore, aptamers are largely employed for producing label-free biosensors (aptasensors), with significant applications in diagnostics and drug delivery. In particular, the anti-thrombin aptamers are biomolecules of high interest for clinical use, because of their ability to recognize and bind the thrombin enzyme. Among them, the DNA 15-mer aptamer (TBA), has been widely explored around the possibility of using it in aptasensors. This paper proposes a microscopic model of the electrical properties of TBA and of the aptamer-thrombin complex, combining information from both structure and function, following the issues addressed in an emerging branch of electronics known as proteotronics. The theoretical results are compared and validated with measurements reported in the literature. Finally, the model suggests resistance measurements as a novel tool for testing aptamer-target affinity.
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Affiliation(s)
- Eleonora Alfinito
- Dipartimento di Ingegneria dell'Innovazione. Università del Salento, via Monteroni, Lecce, Italy
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Guascito MR, Chirizzi D, Malitesta C, Giotta L, Mastrogiacomo D, Valli L, Stabili L. Development and characterization of a novel bioactive polymer with antibacterial and lysozyme-like activity. Biopolymers 2014; 101:461-70. [DOI: 10.1002/bip.22404] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 07/31/2013] [Accepted: 08/27/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Maria Rachele Guascito
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali; Università del Salento; Via Monteroni 73100 Lecce Italy
| | - Daniela Chirizzi
- Dipartimento di Beni Culturali; Università del Salento; Via Birago 73100 Lecce Italy
| | - Cosimino Malitesta
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali; Università del Salento; Via Monteroni 73100 Lecce Italy
| | - Livia Giotta
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali; Università del Salento; Via Monteroni 73100 Lecce Italy
| | - Disma Mastrogiacomo
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali; Università del Salento; Via Monteroni 73100 Lecce Italy
| | - Ludovico Valli
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali; Università del Salento; Via Monteroni 73100 Lecce Italy
| | - Loredana Stabili
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali; Università del Salento; Via Monteroni 73100 Lecce Italy
- Dipartimento di Beni Culturali; Università del Salento; Via Birago 73100 Lecce Italy
- Istituto per l'Ambiente Marino Costiero CNR U.O.S. Taranto; Via Roma 3 74100 Taranto Italy
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Contini D, Cesari D, Genga A, Siciliano M, Ielpo P, Guascito MR, Conte M. Source apportionment of size-segregated atmospheric particles based on the major water-soluble components in Lecce (Italy). Sci Total Environ 2014; 472:248-61. [PMID: 24295746 DOI: 10.1016/j.scitotenv.2013.10.127] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [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: 04/30/2013] [Revised: 10/28/2013] [Accepted: 10/31/2013] [Indexed: 05/18/2023]
Abstract
Atmospheric aerosols have potential effects on human health, on the radiation balance, on climate, and on visibility. The understanding of these effects requires detailed knowledge of aerosol composition and size distributions and of how the different sources contribute to particles of different sizes. In this work, aerosol samples were collected using a 10-stage Micro-Orifice Uniform Deposit Impactor (MOUDI). Measurements were taken between February and October 2011 in an urban background site near Lecce (Apulia region, southeast of Italy). Samples were analysed to evaluate the concentrations of water-soluble ions (SO4(2-), NO3(-), NH4(+), Cl(-), Na(+), K(+), Mg(2+) and Ca(2+)) and of water-soluble organic and inorganic carbon. The aerosols were characterised by two modes, an accumulation mode having a mass median diameter (MMD) of 0.35 ± 0.02 μm, representing 51 ± 4% of the aerosols and a coarse mode (MMD=4.5 ± 0.4 μm), representing 49 ± 4% of the aerosols. The data were used to estimate the losses in the impactor by comparison with a low-volume sampler. The average loss in the MOUDI-collected aerosol was 19 ± 2%, and the largest loss was observed for NO3(-) (35 ± 10%). Significant losses were observed for Ca(2+) (16 ± 5%), SO4(2-) (19 ± 5%) and K(+) (10 ± 4%), whereas the losses for Na(+) and Mg(2+) were negligible. Size-segregated source apportionment was performed using Positive Matrix Factorization (PMF), which was applied separately to the coarse (size interval 1-18 μm) and accumulation (size interval 0.056-1 μm) modes. The PMF model was able to reasonably reconstruct the concentration in each size-range. The uncertainties in the source apportionment due to impactor losses were evaluated. In the accumulation mode, it was not possible to distinguish the traffic contribution from other combustion sources. In the coarse mode, it was not possible to efficiently separate nitrate from the contribution of crustal/resuspension origin.
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Affiliation(s)
- D Contini
- Istituto di Scienze dell'Atmosfera e del Clima, ISAC-CNR, Lecce, Italy.
| | - D Cesari
- Istituto di Scienze dell'Atmosfera e del Clima, ISAC-CNR, Lecce, Italy
| | - A Genga
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Università del Salento, Lecce, Italy
| | - M Siciliano
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Università del Salento, Lecce, Italy
| | - P Ielpo
- Istituto di Scienze dell'Atmosfera e del Clima, ISAC-CNR, Lecce, Italy; Istituto di Ricerca Sulle Acque, IRSA-CNR, Bari, Italy
| | - M R Guascito
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Università del Salento, Lecce, Italy
| | - M Conte
- Istituto di Scienze dell'Atmosfera e del Clima, ISAC-CNR, Lecce, Italy
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Guascito MR, Chirizzi D, Malitesta C, Siciliano T, Tepore A. Te oxide nanowires as advanced materials for amperometric nonenzymatic hydrogen peroxide sensing. Talanta 2013; 115:863-9. [DOI: 10.1016/j.talanta.2013.06.032] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Revised: 06/17/2013] [Accepted: 06/20/2013] [Indexed: 11/29/2022]
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Pietrangeli D, Garramone G, Guascito MR, Pepe A, Rosa A, Ricciardi G. Synthesis, coordination chemistry, and physico-chemical properties of the 2-chloroethoxy-iron(III)(ethylthio) porphyrazine. J PORPHYR PHTHALOCYA 2013. [DOI: 10.1142/s1088424613500685] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Reaction of octakis(ethylthio)porphyrazine ( H 2 OESPz ) with FeBr 2 in ClCH 2 CH 2 OH at 135 °C affords the 2-chloroethoxy-iron(III)-(ethylthio)porphyrazine, ( ClCH 2 CH 2 O ) Fe III OESPz , ( LFe III OESPz ) in good yield. The spectroscopic, redox, and coordination properties of the complex and its μ-oxo dimer derivative, [ Fe III OESPz ]2 O , are investigated and compared to those of the iron(III)porphyrin analogs.
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Affiliation(s)
- Daniela Pietrangeli
- Università della Basilicata, Dipartimento di Scienze, Viale dell'Ateneo Lucano 10, 85100 Potenza, Italy
| | - Gaetano Garramone
- Università della Basilicata, Dipartimento di Scienze, Viale dell'Ateneo Lucano 10, 85100 Potenza, Italy
| | - Maria Rachele Guascito
- Università del Salento, Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Via per Monteroni, 73100, Lecce, Italy
| | - Antonietta Pepe
- Università della Basilicata, Dipartimento di Scienze, Viale dell'Ateneo Lucano 10, 85100 Potenza, Italy
| | - Angela Rosa
- Università della Basilicata, Dipartimento di Scienze, Viale dell'Ateneo Lucano 10, 85100 Potenza, Italy
| | - Giampaolo Ricciardi
- Università della Basilicata, Dipartimento di Scienze, Viale dell'Ateneo Lucano 10, 85100 Potenza, Italy
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Guascito MR, Chirizzi D, Malitesta C, Siciliano M, Siciliano T, Tepore A. Amperometric non-enzymatic bimetallic glucose sensor based on platinum tellurium microtubes modified electrode. Electrochem commun 2012. [DOI: 10.1016/j.elecom.2012.05.024] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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Giancane G, Guascito MR, Malitesta C, Mazzotta E, Picca RA, Valli L. QCM sensors for aqueous phenols based on active layers constituted by tetrapyrrolic macrocycle Langmuir films. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424609001467] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Three different metalated tetrapyrrolic macrocycles have been transferred by Langmuir-Blodgett technique directly onto piezoelectric quartz crystal covered with gold electrodes of a commercial quartz crystal microbalance instrument in order to perform a flow injection analysis. All floating films at the air-water interface have been analyzed by registration of Langmuir curves and by UV-vis reflection spectroscopy and brewster angle microscopy. The sensing performances of the modified gold electrodes were investigated by monitoring the frequency variation induced by the presence of several toxic phenols. The explored concentrations ranged around 10-3 M and the corresponding frequency variations ranged between 10 and 200 Hz. All responses observed were fast, reproducible and reversible; moreover, the active layers are stable over long periods of utilization. The observation that interferences from fulvic acid are absolutely negligible is also noteworthy. The responses are not selective for each singular phenol derivative; notwithstanding this, to the best of our knowledge, this contribution represents one of the first examples of sensing layers for the monitoring of the total content of phenols.
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Affiliation(s)
- Gabriele Giancane
- Dipartimento di Ingegneria dell'Innovazione, Università del Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Maria Rachele Guascito
- Dipartimento di Scienza dei Materiali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Cosimino Malitesta
- Dipartimento di Scienza dei Materiali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Elisabetta Mazzotta
- Dipartimento di Scienza dei Materiali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Rosaria Anna Picca
- Dipartimento di Scienza dei Materiali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Ludovico Valli
- Dipartimento di Ingegneria dell'Innovazione, Università del Salento, Via Monteroni, I-73100 Lecce, Italy
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Malitesta C, Picca RA, Mazzotta E, Guascito MR. Tools for the Development of Electrochemical Sensors: an EQCM Flow Cell with Flow Focusing. ELECTROANAL 2012. [DOI: 10.1002/elan.201100559] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Guascito MR, Chirizzi D, Malitesta C, Mazzotta E. Mediator-free amperometric glucose biosensor based on glucose oxidase entrapped in poly(vinyl alcohol) matrix. Analyst 2010; 136:164-73. [PMID: 20877902 DOI: 10.1039/c0an00194e] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple and novel amperometric biosensor for glucose detection is proposed. It is based on the immobilization of glucose oxidase (GOx) in a poly(vinyl alcohol) (PVA) matrix directly drop casted on a platinum electrode surface (Pt/GOx-PVA). Glucose was determined in the absence of a mediator used to transfer electrons between the electrode and the enzyme. The correlation between peak current (i(p)) and scan rate has been verified and the effect of pH solution has been checked. Glucose detection has been performed amperometrically at -400 mV by using pulsed amperometric detection (PAD). Under the selected optimal conditions, the biosensor showed low detection limit (10 μM), wide dynamic range (0.1-37 mM) and high sensitivity. The biosensor amperometric response revealed it to be specific to glucose without significant interference from other sugars and electroactive species coexisting with glucose in biological fluids. Response stability was another interesting feature of the developed system as it was almost completely recovered when the biosensor was left in opportune storage conditions (i.e., a response decrease of only 13% after 35 days in air at room temperature). Finally, X-Ray Photoelectron Spectroscopy (XPS) characterization revealed a homogeneous film deposited on the Pt substrate whose structure is also preserved under operative conditions.
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Affiliation(s)
- Maria Rachele Guascito
- Dipartimento di Scienza dei Materiali, Università del Salento, via Arnesano, 73100 Lecce, Italy.
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Guascito MR, Malitesta C, Mazzotta E, Turco A. Screen-Printed Glucose Oxidase-Based Biosensor for Inhibitive Detection of Heavy Metal Ions in a Flow Injection System. ACTA ACUST UNITED AC 2009. [DOI: 10.1166/sl.2009.1026] [Citation(s) in RCA: 13] [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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Garramone G, Pietrangeli D, Ricciardi G, Conoci S, Guascito MR, Malitesta C, Cesari D, Casilli S, Giotta L, Giancane G, Valli L. Electrochemical and Spectroscopic Behavior of Iron(III) Porphyrazines in Langmuir−Schäfer Films. J Phys Chem B 2008; 112:11517-28. [DOI: 10.1021/jp803418b] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [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)
- Gaetano Garramone
- Dipartimento di Chimica, Università della Basilicata, Via N. Sauro, 85, I-85100 Potenza, Italia, Laboratorio di Chimica Analitica, Dipartimento di Scienza dei Materiali, Università del Salento, Via Arnesano 73100 Lecce, Italia, Istituto di Scienze dell’Atmosfera e del Clima, CNR, Str. Prov. Lecce-Monteroni Km 1.2, 73100 Lecce, Italia, LabonChip R&D, Microfluidic Division, CPG Group, STMicroelectronics, Stradale Primosole 50 − 95121 Catania, Italia, Dipartimento di Ingegneria dell’Innovazione, Università
| | - Daniela Pietrangeli
- Dipartimento di Chimica, Università della Basilicata, Via N. Sauro, 85, I-85100 Potenza, Italia, Laboratorio di Chimica Analitica, Dipartimento di Scienza dei Materiali, Università del Salento, Via Arnesano 73100 Lecce, Italia, Istituto di Scienze dell’Atmosfera e del Clima, CNR, Str. Prov. Lecce-Monteroni Km 1.2, 73100 Lecce, Italia, LabonChip R&D, Microfluidic Division, CPG Group, STMicroelectronics, Stradale Primosole 50 − 95121 Catania, Italia, Dipartimento di Ingegneria dell’Innovazione, Università
| | - Giampaolo Ricciardi
- Dipartimento di Chimica, Università della Basilicata, Via N. Sauro, 85, I-85100 Potenza, Italia, Laboratorio di Chimica Analitica, Dipartimento di Scienza dei Materiali, Università del Salento, Via Arnesano 73100 Lecce, Italia, Istituto di Scienze dell’Atmosfera e del Clima, CNR, Str. Prov. Lecce-Monteroni Km 1.2, 73100 Lecce, Italia, LabonChip R&D, Microfluidic Division, CPG Group, STMicroelectronics, Stradale Primosole 50 − 95121 Catania, Italia, Dipartimento di Ingegneria dell’Innovazione, Università
| | - Sabrina Conoci
- Dipartimento di Chimica, Università della Basilicata, Via N. Sauro, 85, I-85100 Potenza, Italia, Laboratorio di Chimica Analitica, Dipartimento di Scienza dei Materiali, Università del Salento, Via Arnesano 73100 Lecce, Italia, Istituto di Scienze dell’Atmosfera e del Clima, CNR, Str. Prov. Lecce-Monteroni Km 1.2, 73100 Lecce, Italia, LabonChip R&D, Microfluidic Division, CPG Group, STMicroelectronics, Stradale Primosole 50 − 95121 Catania, Italia, Dipartimento di Ingegneria dell’Innovazione, Università
| | - Maria Rachele Guascito
- Dipartimento di Chimica, Università della Basilicata, Via N. Sauro, 85, I-85100 Potenza, Italia, Laboratorio di Chimica Analitica, Dipartimento di Scienza dei Materiali, Università del Salento, Via Arnesano 73100 Lecce, Italia, Istituto di Scienze dell’Atmosfera e del Clima, CNR, Str. Prov. Lecce-Monteroni Km 1.2, 73100 Lecce, Italia, LabonChip R&D, Microfluidic Division, CPG Group, STMicroelectronics, Stradale Primosole 50 − 95121 Catania, Italia, Dipartimento di Ingegneria dell’Innovazione, Università
| | - Cosimino Malitesta
- Dipartimento di Chimica, Università della Basilicata, Via N. Sauro, 85, I-85100 Potenza, Italia, Laboratorio di Chimica Analitica, Dipartimento di Scienza dei Materiali, Università del Salento, Via Arnesano 73100 Lecce, Italia, Istituto di Scienze dell’Atmosfera e del Clima, CNR, Str. Prov. Lecce-Monteroni Km 1.2, 73100 Lecce, Italia, LabonChip R&D, Microfluidic Division, CPG Group, STMicroelectronics, Stradale Primosole 50 − 95121 Catania, Italia, Dipartimento di Ingegneria dell’Innovazione, Università
| | - Daniela Cesari
- Dipartimento di Chimica, Università della Basilicata, Via N. Sauro, 85, I-85100 Potenza, Italia, Laboratorio di Chimica Analitica, Dipartimento di Scienza dei Materiali, Università del Salento, Via Arnesano 73100 Lecce, Italia, Istituto di Scienze dell’Atmosfera e del Clima, CNR, Str. Prov. Lecce-Monteroni Km 1.2, 73100 Lecce, Italia, LabonChip R&D, Microfluidic Division, CPG Group, STMicroelectronics, Stradale Primosole 50 − 95121 Catania, Italia, Dipartimento di Ingegneria dell’Innovazione, Università
| | - Serena Casilli
- Dipartimento di Chimica, Università della Basilicata, Via N. Sauro, 85, I-85100 Potenza, Italia, Laboratorio di Chimica Analitica, Dipartimento di Scienza dei Materiali, Università del Salento, Via Arnesano 73100 Lecce, Italia, Istituto di Scienze dell’Atmosfera e del Clima, CNR, Str. Prov. Lecce-Monteroni Km 1.2, 73100 Lecce, Italia, LabonChip R&D, Microfluidic Division, CPG Group, STMicroelectronics, Stradale Primosole 50 − 95121 Catania, Italia, Dipartimento di Ingegneria dell’Innovazione, Università
| | - Livia Giotta
- Dipartimento di Chimica, Università della Basilicata, Via N. Sauro, 85, I-85100 Potenza, Italia, Laboratorio di Chimica Analitica, Dipartimento di Scienza dei Materiali, Università del Salento, Via Arnesano 73100 Lecce, Italia, Istituto di Scienze dell’Atmosfera e del Clima, CNR, Str. Prov. Lecce-Monteroni Km 1.2, 73100 Lecce, Italia, LabonChip R&D, Microfluidic Division, CPG Group, STMicroelectronics, Stradale Primosole 50 − 95121 Catania, Italia, Dipartimento di Ingegneria dell’Innovazione, Università
| | - Gabriele Giancane
- Dipartimento di Chimica, Università della Basilicata, Via N. Sauro, 85, I-85100 Potenza, Italia, Laboratorio di Chimica Analitica, Dipartimento di Scienza dei Materiali, Università del Salento, Via Arnesano 73100 Lecce, Italia, Istituto di Scienze dell’Atmosfera e del Clima, CNR, Str. Prov. Lecce-Monteroni Km 1.2, 73100 Lecce, Italia, LabonChip R&D, Microfluidic Division, CPG Group, STMicroelectronics, Stradale Primosole 50 − 95121 Catania, Italia, Dipartimento di Ingegneria dell’Innovazione, Università
| | - Ludovico Valli
- Dipartimento di Chimica, Università della Basilicata, Via N. Sauro, 85, I-85100 Potenza, Italia, Laboratorio di Chimica Analitica, Dipartimento di Scienza dei Materiali, Università del Salento, Via Arnesano 73100 Lecce, Italia, Istituto di Scienze dell’Atmosfera e del Clima, CNR, Str. Prov. Lecce-Monteroni Km 1.2, 73100 Lecce, Italia, LabonChip R&D, Microfluidic Division, CPG Group, STMicroelectronics, Stradale Primosole 50 − 95121 Catania, Italia, Dipartimento di Ingegneria dell’Innovazione, Università
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Mele G, Del Sole R, Vasapollo G, Marcì G, Garcìa-Lopez E, Palmisano L, Coronado JM, Hernández-Alonso MD, Malitesta C, Guascito MR. TRMC, XPS, and EPR characterizations of polycrystalline TiO2 porphyrin impregnated powders and their catalytic activity for 4-nitrophenol photodegradation in aqueous suspension. J Phys Chem B 2007; 109:12347-52. [PMID: 16852524 DOI: 10.1021/jp044253g] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Characterization of polycrystalline TiO(2) bare or porphyrin impregnated powders, used as photocatalysts for the degradation of 4-nitrophenol (4-NP) in aqueous suspension, was performed by time-resolved microwave conductivity (TRMC) measurements and electronic paramagnetic resonance (EPR) and X-ray photoelectron (XPS) spectroscopies. The presence of porphyrin sensitizers, as the metal-free or Cu [5,10,15,20-tetra (4-tert-butylphenyl)] porphyrin, impregnated onto the TiO(2) surface improved the photocatalytic activity of the bare TiO(2). TRMC measurements indicate that the number and lifetime of the photoinduced excess charge carriers increase in the presence of the macrocycles, and EPR and XPS spectroscopies support the mechanistic hypotheses based on the photoreactivity experiments.
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Affiliation(s)
- Giuseppe Mele
- Dipartimento di Ingegneria dell'Innovazione, Università di Lecce, Via Arnesano, 73100 Lecce, Italy.
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25
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Longo L, Vasapollo G, Guascito MR, Malitesta C. New insights from X-ray photoelectron spectroscopy into the chemistry of covalent enzyme immobilization, with glutamate dehydrogenase (GDH) on silicon dioxide as an example. Anal Bioanal Chem 2006; 385:146-52. [PMID: 16583206 DOI: 10.1007/s00216-006-0398-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [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: 01/04/2006] [Revised: 02/22/2006] [Accepted: 02/24/2006] [Indexed: 11/24/2022]
Abstract
A three-step process for immobilization of glutamate dehydrogenase (GDH) on the surface of silicon dioxide has been studied by X-ray photoelectron spectroscopy (XPS). The enzyme layer was deposited on the silicon dioxide surface after first exposing the surface to 3-aminopropyltriethoxysilane (3-APTS) and reacting the silylated surface with glutaraldehyde (GA). Fine XPS analysis, performed after each step of the chemical procedure, revealed unknown details of the step-by-step construction of the enzyme layer under different experimental conditions.
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Affiliation(s)
- Luigia Longo
- Dipartimento di Ingegneria dell'Innovazione, Università di Lecce, via Arnesano, 73100 Lecce, Italy
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26
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Malitesta C, Guascito MR. Heavy metal determination by biosensors based on enzyme immobilised by electropolymerisation. Biosens Bioelectron 2005; 20:1643-7. [PMID: 15626621 DOI: 10.1016/j.bios.2004.08.003] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [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: 05/24/2004] [Revised: 07/28/2004] [Accepted: 08/04/2004] [Indexed: 10/26/2022]
Abstract
The work describes the original application of biosensors based on enzyme immobilised by electropolymerisation to heavy metal determination. An inhibition detection scheme has been employed for detecting Hg2+ by an established glucose biosensor based on glucose oxidase immobilised in poly-o-phenylenediamine. The investigated enzymatic inhibition appears reversible and mixed, in agreement with data for the enzyme in solution. A low response time (<2 min) and a rapid recovery of response by EDTA seem the most interesting characteristics of the proposed biosensor at the present stage of development, along with the well known easy preparation of this kind of biosensors. The occurrence of a high response also for Cu2+ opens the possibility to apply the biosensor in total toxic metal content determination.
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Affiliation(s)
- C Malitesta
- Laboratorio di Chimica Analitica, Dipartimento di Scienza dei Materiali, Università di Lecce, Via Arnesano, 73100 Lecce, Italy.
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27
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Salvi AM, Guascito MR, DeBonis A, Simone F, Pennisi A, Decker F. Lithium intercalation on amorphous V2O5 thin film, obtained by r.f. deposition, usingin situ sample transfer for XPS analysis. SURF INTERFACE ANAL 2003. [DOI: 10.1002/sia.1617] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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28
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Salvi AM, Pucciariello R, Guascito MR, Villani V, Intermite L. Characterization of the interface in rubber/silica composite materials. SURF INTERFACE ANAL 2002. [DOI: 10.1002/sia.1463] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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29
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De Giglio E, Guascito MR, Sabbatin L, Zambonin G. Electropolymerization of pyrrole on titanium substrates for the future development of new biocompatible surfaces. Biomaterials 2001; 22:2609-16. [PMID: 11519780 DOI: 10.1016/s0142-9612(00)00449-x] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.0] [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: 10/27/2022]
Abstract
Titanium and its alloys are widely used in load-bearing implants as a result of their excellent mechanical properties and corrosion resistance. In order to improve their performances with respect to osseointegration, the use of bioactive coatings has been suggested. Polypyrrole (PPy) has been chosen as coating polymer because of its ability to be electrochemically grown directly onto metallic substrates, of any shape and dimension, leading to remarkably adherent overlayers. This polymer, in addition to protecting the metal implant against corrosion, could be surface modified with biologically active molecules able to stimulate positive interactions with bone tissue. In this work, PPy electrosynthesis on both titanium and Ti-Al-V substrates has been investigated. The chemical composition and the morphology of the polymeric films, deposited under different conditions, were evaluated by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), respectively.
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Affiliation(s)
- E De Giglio
- Dipartimento di Chimica, Università degli Studi di Bari, Italy
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30
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Casella IG, Guascito MR, De Benedetto GE. Electrooxidation of thiocyanate on the copper-modified gold electrode and its amperometric determination by ion chromatography. Analyst 1998; 123:1359-63. [PMID: 9764513 DOI: 10.1039/a709041b] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cyclic voltammetry was used to investigate the electrochemical behavior of an Au/Cu electrode towards the electrooxidation of thiocyanate ion in alkaline medium. The effects of pH, copper loading, scan rate and applied potential on the electrocatalytic oxidation of thiocyanate have been investigated. Flow injection experiments and ion-chromatography (IC) were performed to characterise the electrode as an amperometric sensor for the thiocyanate determination. The effects of carbonate concentration and common interferents on the retention time were also estimated. The electrode stability, precision, limit of detection and linear range were evaluated at a constant applied potential of 0.7 V vs. Ag/AgCl. Calibration plots, obtained in IC, were linear from 1.0 to 195 microM (correlation coefficient of 0.9984). The detection limit (LOD) was 0.5 microM (29 ppb) in a 50 microlitres injection. An example of analytical application, which includes the IC separation and detection of thiocyanate ion present in human urine, is given.
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Affiliation(s)
- I G Casella
- Dipartimento di Chimica, Universita' degli Studi della Basilicata, Potenza, Italy
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