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Parmigiani M, Schifano V, Taglietti A, Galinetto P, Albini B. Increasing gold nanostars SERS response with silver shells: a surface-based seed-growth approach. Nanotechnology 2024; 35:195603. [PMID: 38306966 DOI: 10.1088/1361-6528/ad25c9] [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] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 02/02/2024] [Indexed: 02/04/2024]
Abstract
A straightforward method to prepare surface enhanced Raman spectroscopy (SERS) chips containing a monolayer of silver coated gold nanostars (GNS@Ag) grafted on a glass surface is introduced. The synthetic approach is based on a seed growth method performed directly on surface, using GNS as seeds, and involving a green pathway, which only uses silver nitate, ascorbic acid and water, to grow the silver shell. The preparation was optimized to maximize signals obtaining a SERS response of one order of magnitude greater than that from the original GNS based chips, offering in the meantime good homogeneity and acceptable reproducibility. The proposed GNS@Ag SERS chips are able to detect pesticide thiram down to 20 ppb.
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Affiliation(s)
- Miriam Parmigiani
- Dipartimento di Chimica, Sezione di Chimica Generale, Università di Pavia, viale Taramelli, 12-I-27100 Pavia-Italy
| | - Veronica Schifano
- Dipartimento di Chimica, Sezione di Chimica Generale, Università di Pavia, viale Taramelli, 12-I-27100 Pavia-Italy
| | - Angelo Taglietti
- Dipartimento di Chimica, Sezione di Chimica Generale, Università di Pavia, viale Taramelli, 12-I-27100 Pavia-Italy
| | - Pietro Galinetto
- Dipartimento di Fisica, Università di Pavia, Via Bassi 6,-I-27100 Pavia-Italy
| | - Benedetta Albini
- Dipartimento di Fisica, Università di Pavia, Via Bassi 6,-I-27100 Pavia-Italy
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2
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Morris G, Goodman S, Sorzabal Bellido I, Milanese C, Girella A, Pallavicini P, Taglietti A, Gaboardi M, Jäckel F, Diaz Fernandez YA, Raval R. Temperature and pH Stimuli-Responsive System Delivers Location-Specific Antimicrobial Activity with Natural Products. ACS Appl Bio Mater 2024; 7:131-143. [PMID: 38079569 DOI: 10.1021/acsabm.3c00588] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2024]
Abstract
Smart materials with controlled stimuli-responsive functions are at the forefront of technological development. In this work, we present a generic strategy that combines simple components, physicochemical responses, and easy fabrication methods to achieve a dual stimuli-responsive system capable of location-specific antimicrobial cargo delivery. The encapsulated system is fabricated by combining a biocompatible inert polymeric matrix of poly(dimethylsiloxane) (PDMS) and a bioactive cargo of saturated fatty acids. We demonstrate the effectiveness of our approach to deliver antimicrobial activity for the model bacteria Escherichia coli. The system responds to two control variables, temperature and pH, delivering two levels of antimicrobial response under distinct combinations of stimuli: one response toward the planktonic media and another response directly at the surface for sessile bacteria. Spatially resolved Raman spectroscopy alongside thermal and structural material analysis reveals that the system not only exhibits ON/OFF states but can also control relocation and targeting of the active cargo toward either the surface or the liquid media, leading to different ON/OFF states for the planktonic and sessile bacteria. The approach proposed herein is technologically simple and scalable, facing low regulatory barriers within the food and healthcare sectors by using approved components and relying on fundamental chemical processes. Our results also provide a proof-of-concept platform for the design and easy fabrication of delivery systems capable of operating as Boolean logic gates, delivering different responses under different environmental conditions.
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Affiliation(s)
- Gareth Morris
- Open Innovation Hub for Antimicrobial Surfaces, Surface Science Research Centre, University of Liverpool, Liverpool L69 3BX, U.K
- Department of Physics and Stephenson Institute for Renewable Energy, University of Liverpool, Liverpool L69 7ZE, U.K
| | - Sean Goodman
- Open Innovation Hub for Antimicrobial Surfaces, Surface Science Research Centre, University of Liverpool, Liverpool L69 3BX, U.K
| | - Ioritz Sorzabal Bellido
- Open Innovation Hub for Antimicrobial Surfaces, Surface Science Research Centre, University of Liverpool, Liverpool L69 3BX, U.K
| | - Chiara Milanese
- Department of Chemistry, University of Pavia, Via Taramelli 12, Pavia 27100, Italy
| | - Alessandro Girella
- Department of Chemistry, University of Pavia, Via Taramelli 12, Pavia 27100, Italy
| | | | - Angelo Taglietti
- Department of Chemistry, University of Pavia, Via Taramelli 12, Pavia 27100, Italy
| | - Mattia Gaboardi
- Materials Physics Center, CSIC-UPV/EHU, Donostia - San Sebastian 20018, Spain
| | - Frank Jäckel
- Department of Physics and Stephenson Institute for Renewable Energy, University of Liverpool, Liverpool L69 7ZE, U.K
| | - Yuri A Diaz Fernandez
- Open Innovation Hub for Antimicrobial Surfaces, Surface Science Research Centre, University of Liverpool, Liverpool L69 3BX, U.K
- Department of Chemistry, University of Pavia, Via Taramelli 12, Pavia 27100, Italy
| | - Rasmita Raval
- Open Innovation Hub for Antimicrobial Surfaces, Surface Science Research Centre, University of Liverpool, Liverpool L69 3BX, U.K
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3
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Altomare M, Qin S, Saveleva VA, Badura Z, Tomanec O, Mazare A, Zoppellaro G, Vertova A, Taglietti A, Minguzzi A, Ghigna P, Schmuki P. Metastable Ni(I)-TiO 2-x Photocatalysts: Self-Amplifying H 2 Evolution from Plain Water without Noble Metal Co-Catalyst and Sacrificial Agent. J Am Chem Soc 2023; 145:26122-26132. [PMID: 37984877 DOI: 10.1021/jacs.3c08199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
Decoration of semiconductor photocatalysts with cocatalysts is generally done by a step-by-step assembly process. Here, we describe the self-assembling and self-activating nature of a photocatalytic system that forms under illumination of reduced anatase TiO2 nanoparticles in an aqueous Ni2+ solution. UV illumination creates in situ a Ni+/TiO2/Ti3+ photocatalyst that self-activates and, over time, produces H2 at a higher rate. In situ X-ray absorption spectroscopy and electron paramagnetic resonance spectroscopy show that key to self-assembly and self-activation is the light-induced formation of defects in the semiconductor, which enables the formation of monovalent nickel (Ni+) surface states. Metallic nickel states, i.e., Ni0, do not form under the dark (resting state) or under illumination (active state). Once the catalyst is assembled, the Ni+ surface states act as electron relay for electron transfer to form H2 from water, in the absence of sacrificial species or noble metal cocatalysts.
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Affiliation(s)
- Marco Altomare
- PhotoCatalytic Synthesis PCS Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, Enschede 7500 AE, The Netherlands
| | - Shanshan Qin
- Department Materials Science WW-4, LKO, Friedrich-Alexander-University of Erlangen-Nuremberg (FAU), Erlangen 91058, Germany
| | - Viktoriia A Saveleva
- ESRF, The European Synchrotron, 71 Avenue des Martyrs, CS40220, Grenoble Cedex 9 38043, France
| | - Zdenek Badura
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University Olomouc, Křížkovského 511/8, Olomouc 779 00, Czech Republic
- Nanotechnology Centre, VŠB - Technical University of Ostrava, 17. listopadu 2172/15, Ostrava-Poruba 708 00, Czech Republic
| | - Ondrej Tomanec
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University Olomouc, Křížkovského 511/8, Olomouc 779 00, Czech Republic
| | - Anca Mazare
- Department Materials Science WW-4, LKO, Friedrich-Alexander-University of Erlangen-Nuremberg (FAU), Erlangen 91058, Germany
| | - Giorgio Zoppellaro
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University Olomouc, Křížkovského 511/8, Olomouc 779 00, Czech Republic
- Nanotechnology Centre, VŠB - Technical University of Ostrava, 17. listopadu 2172/15, Ostrava-Poruba 708 00, Czech Republic
| | - Alberto Vertova
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, Milan 20133, Italy
| | - Angelo Taglietti
- Dipartimento di Chimica, Università degli Studi di Pavia, Viale Taramelli 13, Pavia 27100, Italy
| | - Alessandro Minguzzi
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, Milan 20133, Italy
| | - Paolo Ghigna
- Dipartimento di Chimica, Università degli Studi di Pavia, Viale Taramelli 13, Pavia 27100, Italy
| | - Patrik Schmuki
- Department Materials Science WW-4, LKO, Friedrich-Alexander-University of Erlangen-Nuremberg (FAU), Erlangen 91058, Germany
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University Olomouc, Křížkovského 511/8, Olomouc 779 00, Czech Republic
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4
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Ligia S, Musiu P, Serrao A, Santoro C, Taglietti A, Capriata M, Faccini A, Molinari MC, Baldacci E, Chistolini A. Low-dose apixaban or rivaroxaban as secondary prophylaxis of upper extremity deep vein thrombosis. J Thromb Thrombolysis 2023:10.1007/s11239-023-02842-6. [PMID: 37341894 DOI: 10.1007/s11239-023-02842-6] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/01/2023] [Indexed: 06/22/2023]
Abstract
Upper extremity deep vein thrombosis (UEDVT) may occur without inciting factor or may be secondary to malignancy, surgery, trauma, central venous catheter or related to thoracic outlet syndrome (TOS). International guidelines recommend anticoagulant treatment for at least three months, in particular the use of vitamin K antagonists (VKAs) and direct oral anticoagulants (DOACs). No data on extended anticoagulant therapy and reduced dose of DOACs have been reported in patients affected by UEDVT with persistent thrombotic risk (active cancer, major congenital thrombophilia) or without affected vein recanalization. In our retrospective observational study, including 43 patients, we treated secondary UEDVT with DOACs. In the acute phase of thrombosis (median time of 4 months), we used therapeutic dose of DOACs; the 32 patients with permanent thrombotic risk factors or without recanalization of the UEDVT were shifted to low-dose DOACs (apixaban 2.5 mg twice daily or rivaroxaban 10 mg daily). During therapy with full-dose DOACs, 1 patient presented recurrence of thrombosis; no thromboembolic events were observed during treatment with low-dose DOACs. During full-dose treatment, 3 patients presented minor hemorrhagic complications; no hemorrhagic events were observed during DOACs at low dose. We think our preliminary data could support the indication to extend the anticoagulation with dose reduction of DOACs in patients affected by UEDVT and no-transient thrombotic risk. These data should be confirmed in randomized controlled prospective study.
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Affiliation(s)
- S Ligia
- Hematology, Department of Translational and Precision Medicine, Sapienza University of Rome, Via Benevento 6, Rome, 00161, Italy
| | - P Musiu
- Hematology, Department of Translational and Precision Medicine, Sapienza University of Rome, Via Benevento 6, Rome, 00161, Italy
| | - A Serrao
- Hematology, Department of Translational and Precision Medicine, Sapienza University of Rome, Via Benevento 6, Rome, 00161, Italy
| | - C Santoro
- Hematology, Department of Translational and Precision Medicine, Sapienza University of Rome, Via Benevento 6, Rome, 00161, Italy
| | - A Taglietti
- Hematology, Department of Translational and Precision Medicine, Sapienza University of Rome, Via Benevento 6, Rome, 00161, Italy
| | - M Capriata
- Hematology, Department of Translational and Precision Medicine, Sapienza University of Rome, Via Benevento 6, Rome, 00161, Italy
| | - A Faccini
- Hematology, Department of Translational and Precision Medicine, Sapienza University of Rome, Via Benevento 6, Rome, 00161, Italy
| | - M C Molinari
- Hematology, Department of Translational and Precision Medicine, Sapienza University of Rome, Via Benevento 6, Rome, 00161, Italy
| | - E Baldacci
- Hematology, Department of Translational and Precision Medicine, Sapienza University of Rome, Via Benevento 6, Rome, 00161, Italy
| | - Antonio Chistolini
- Hematology, Department of Translational and Precision Medicine, Sapienza University of Rome, Via Benevento 6, Rome, 00161, Italy.
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5
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Doveri L, Dacarro G, Fernandez YAD, Razzetti M, Taglietti A, Chirico G, Collini M, Sorzabal-Bellido I, Esparza M, Ortiz-de-Solorzano C, Urteaga XM, Milanese C, Pallavicini P. Prussian Blue nanoparticles: An FDA-approved substance that may quickly degrade at physiological pH. Colloids Surf B Biointerfaces 2023; 227:113373. [PMID: 37257303 DOI: 10.1016/j.colsurfb.2023.113373] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 04/19/2023] [Accepted: 05/24/2023] [Indexed: 06/02/2023]
Abstract
Prussian blue (PB) is a coordination polymer based on the Fe2+…CN…Fe3+ sequence. It is an FDA-approved drug, intended for oral use at the acidic pH of the stomach and of most of the intestine track. However, based on FDA approval, a huge number of papers proposed the use of PB nanoparticles (PBnp) under "physiological conditions", meaning pH buffered at 7.4 and high saline concentration. While most of these papers report that PBnp are stable at this pH, a small number of papers describes instead PBnp degradation at the same or similar pH values, i.e. in the 7-8 range. Here we give a definitively clear picture: PBnp are intrinsically unstable at pH ≥ 7, degrading with the fast disappearance of their 700 nm absorption band, due to the formation of OH- complexes from the labile Fe3+ centers. However, we show also that the presence of a polymeric coating (PVP) can protect PBnp at pH 7.4 for over 24 h. Moreover, we demonstrate that when "physiological conditions" include serum, a protein corona is rapidly formed on PBnp, efficiently avoiding degradation. We also show that the viability of PBnp-treated EA.hy926, NCI-H1299, and A549 cells is not affected in a wide range of conditions that either prevent or promote PBnp degradation.
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Affiliation(s)
- Lavinia Doveri
- Dipartimento di Chimica, Università degli Studi di Pavia, viale Taramelli, 12, 27100 Pavia, Italy.
| | - Giacomo Dacarro
- Dipartimento di Chimica, Università degli Studi di Pavia, viale Taramelli, 12, 27100 Pavia, Italy.
| | | | - Matteo Razzetti
- Dipartimento di Chimica, Università degli Studi di Pavia, viale Taramelli, 12, 27100 Pavia, Italy.
| | - Angelo Taglietti
- Dipartimento di Chimica, Università degli Studi di Pavia, viale Taramelli, 12, 27100 Pavia, Italy.
| | - Giuseppe Chirico
- Department of Physics "G. Occhialini", University Milano-Bicocca, Piazza della Scienza, 3, 20126 Milano, Italy.
| | - Maddalena Collini
- Department of Physics "G. Occhialini", University Milano-Bicocca, Piazza della Scienza, 3, 20126 Milano, Italy.
| | - Ioritz Sorzabal-Bellido
- Ciberonc, and Program of Biomedical Engineering, Center for Applied Medical Research (CIMA), University of Navarra, Av. de Pío XII, 55, 31008 Pamplona, Spain.
| | - Maider Esparza
- Ciberonc, and Program of Biomedical Engineering, Center for Applied Medical Research (CIMA), University of Navarra, Av. de Pío XII, 55, 31008 Pamplona, Spain.
| | - Carlos Ortiz-de-Solorzano
- Ciberonc, and Program of Biomedical Engineering, Center for Applied Medical Research (CIMA), University of Navarra, Av. de Pío XII, 55, 31008 Pamplona, Spain.
| | - Xabier Morales Urteaga
- Ciberonc, and Program of Biomedical Engineering, Center for Applied Medical Research (CIMA), University of Navarra, Av. de Pío XII, 55, 31008 Pamplona, Spain.
| | - Chiara Milanese
- Dipartimento di Chimica, Università degli Studi di Pavia, viale Taramelli, 12, 27100 Pavia, Italy.
| | - Piersandro Pallavicini
- Dipartimento di Chimica, Università degli Studi di Pavia, viale Taramelli, 12, 27100 Pavia, Italy.
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6
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Pallavicini P, Preti L, Protopapa ML, Carbone D, Capodieci L, Diaz Fernandez YA, Milanese C, Taglietti A, Doveri L. Nanoparticle-Imprinted Silica Gel for the Size-Selective Capture of Silver Ultrafine Nanoparticles from Water. Molecules 2023; 28:molecules28104026. [PMID: 37241766 DOI: 10.3390/molecules28104026] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 05/02/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
A synthetic approach has been developed to prepare silica gel monoliths that embed well separated silver or gold spherical nanoparticles (NP), with diameters of 8, 18 and 115 nm. Fe3+, O2/cysteine and HNO3 were all successfully used to oxidize and remove silver NP from silica, while aqua regia was necessary for gold NP. In all cases, NP-imprinted silica gel materials were obtained, with spherical voids of the same dimensions of the dissolved particles. By grinding the monoliths, we prepared NP-imprinted silica powders that were able to efficiently reuptake silver ultrafine NP (Ag-ufNP, d = 8 nm) from aqueous solutions. Moreover, the NP-imprinted silica powders showed a remarkable size selectivity, based on the best match between NP radius and the curvature radius of the cavities, driven by the optimization of attractive Van der Waals forces between SiO2 and NP. Ag-ufNP are increasingly used in products, goods, medical devices, disinfectants, and their consequent diffusion in the environment is of rising concern. Although limited here to a proof-of-concept level, the materials and methods described in this paper may be an efficient solution for capturing Ag-ufNP from environmental waters and to safely dispose them.
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Affiliation(s)
| | - Luca Preti
- Department of Chemistry, University of Pavia, V.le Taramelli 12, 27100 Pavia, Italy
| | - Maria L Protopapa
- ENEA-Italian National Agency for New Technologies, Energy and the Sustainable Economic Development, Division Sustainable Materials-Brindisi Research Center, S.S. 7 Appia km. 706, 72100 Brindisi, Italy
| | - Daniela Carbone
- ENEA-Italian National Agency for New Technologies, Energy and the Sustainable Economic Development, Division Sustainable Materials-Brindisi Research Center, S.S. 7 Appia km. 706, 72100 Brindisi, Italy
| | - Laura Capodieci
- ENEA-Italian National Agency for New Technologies, Energy and the Sustainable Economic Development, Division Sustainable Materials-Brindisi Research Center, S.S. 7 Appia km. 706, 72100 Brindisi, Italy
| | | | - Chiara Milanese
- Department of Chemistry, University of Pavia, V.le Taramelli 12, 27100 Pavia, Italy
| | - Angelo Taglietti
- Department of Chemistry, University of Pavia, V.le Taramelli 12, 27100 Pavia, Italy
| | - Lavinia Doveri
- Department of Chemistry, University of Pavia, V.le Taramelli 12, 27100 Pavia, Italy
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7
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Doveri L, Taglietti A, Grisoli P, Pallavicini P, Dacarro G. Dual mode antibacterial surfaces based on Prussian blue and silver nanoparticles. Dalton Trans 2023; 52:452-460. [PMID: 36525102 DOI: 10.1039/d2dt03058f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Prussian Blue (PB) is an inexpensive, biocompatible, photothermally active material. In this paper, self-assembled monolayers of PB nanoparticles were grafted on a glass surface, protected with a thin layer of silica and decorated with spherical silver nanoparticles. This combination of a photothermally active nanomaterial, PB, and an intrinsically antibacterial one, silver, leads to a versatile coating that can be used for medical devices and implants. The intrinsic antibacterial action of nanosilver, always active over time, can be enhanced on demand by switching on the photothermal effect of PB using near infrared (NIR) radiation, which has a good penetration depth through tissues and low side effects. Glass surfaces functionalized by this layer-by-layer approach have been characterized for their morphology and composition, and their intrinsic and photothermal antibacterial effect was studied against Gram+ and Gram- planktonic bacteria.
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Affiliation(s)
- Lavinia Doveri
- University of Pavia - Department of Chemistry and Center for Health Technologies; Via Taramelli 12, I-27100 Pavia, Italy.
| | - Angelo Taglietti
- University of Pavia - Department of Chemistry and Center for Health Technologies; Via Taramelli 12, I-27100 Pavia, Italy.
| | - Pietro Grisoli
- University of Pavia - Department of Drug Science; Via Taramelli 12, I-27100 Pavia, Italy
| | - Piersandro Pallavicini
- University of Pavia - Department of Chemistry and Center for Health Technologies; Via Taramelli 12, I-27100 Pavia, Italy.
| | - Giacomo Dacarro
- University of Pavia - Department of Chemistry and Center for Health Technologies; Via Taramelli 12, I-27100 Pavia, Italy.
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8
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Parmigiani M, Albini B, Pellegrini G, Genovesi M, De Vita L, Pallavicini P, Dacarro G, Galinetto P, Taglietti A. Surface-Enhanced Raman Spectroscopy Chips Based on Silver Coated Gold Nanostars. Nanomaterials (Basel) 2022; 12:nano12203609. [PMID: 36296798 PMCID: PMC9609606 DOI: 10.3390/nano12203609] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/10/2022] [Accepted: 10/12/2022] [Indexed: 06/12/2023]
Abstract
Surface-enhanced Raman scattering (SERS) is becoming widely used as an analytical tool, and the search for stable and highly responsive SERS substrates able to give ultralow detection of pollutants is a current challenge. In this paper we boosted the SERS response of Gold nanostars (GNS) demonstrating that their coating with a layer of silver having a proper thickness produces a 7-fold increase in SERS signals. Glass supported monolayers of these GNS@Ag were then prepared using simple alcoxyliane chemistry, yielding efficient and reproducible SERS chips, which were tested for the detection of molecules representative of different classes of pollutants. Among them, norfloxacin was detected down to 3 ppb, which is one of the lowest limits of detection obtained with this technique for the analyte.
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Affiliation(s)
- Miriam Parmigiani
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Benedetta Albini
- Department of Physics, University of Pavia, Via Bassi 6, 27100 Pavia, Italy
| | | | - Marco Genovesi
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Lorenzo De Vita
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | | | - Giacomo Dacarro
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Pietro Galinetto
- Department of Physics, University of Pavia, Via Bassi 6, 27100 Pavia, Italy
| | - Angelo Taglietti
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
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9
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Gazzola V, Grisoli P, Amendola V, Dacarro G, Mangano C, Pallavicini P, Poggi A, Rossi S, Vigani B, Taglietti A. A Supramolecular Approach to Antimicrobial Surfaces. Molecules 2022; 27:molecules27175731. [PMID: 36080495 PMCID: PMC9457607 DOI: 10.3390/molecules27175731] [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] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 09/02/2022] [Accepted: 09/03/2022] [Indexed: 11/28/2022]
Abstract
In this paper, we report on the preparation of Imidazole-functionalized glass surfaces, demonstrating the ability of a dinuclear Cu(II) complex of a macrocyclic ligand to give a “cascade” interaction with the deprotonated forms of grafted imidazole moieties. In this way, we realized a prototypal example of an antimicrobial surface based on a supramolecular approach, obtaining a neat microbicidal effect using low amounts of the described copper complex.
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Affiliation(s)
- Valentina Gazzola
- Department of Chemistry, University of Pavia, Viale Torquato Taramelli 12, 27100 Pavia, Italy
| | - Pietro Grisoli
- Department of Drug Sciences, University of Pavia, Viale Torquato Taramelli 12, 27100 Pavia, Italy
| | - Valeria Amendola
- Department of Chemistry, University of Pavia, Viale Torquato Taramelli 12, 27100 Pavia, Italy
| | - Giacomo Dacarro
- Department of Chemistry, University of Pavia, Viale Torquato Taramelli 12, 27100 Pavia, Italy
| | - Carlo Mangano
- Department of Chemistry, University of Pavia, Viale Torquato Taramelli 12, 27100 Pavia, Italy
| | - Piersandro Pallavicini
- Department of Chemistry, University of Pavia, Viale Torquato Taramelli 12, 27100 Pavia, Italy
| | - Antonio Poggi
- Department of Chemistry, University of Pavia, Viale Torquato Taramelli 12, 27100 Pavia, Italy
| | - Silvia Rossi
- Department of Drug Sciences, University of Pavia, Viale Torquato Taramelli 12, 27100 Pavia, Italy
| | - Barbara Vigani
- Department of Drug Sciences, University of Pavia, Viale Torquato Taramelli 12, 27100 Pavia, Italy
| | - Angelo Taglietti
- Department of Chemistry, University of Pavia, Viale Torquato Taramelli 12, 27100 Pavia, Italy
- Correspondence:
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10
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Ciarrocchi C, Fabbrizzi L, Licchelli M, Taglietti A. Electrochemically Driven Swinging of a Nitrobenzyl Pendant Arm in a Nickel Scorpionand Complex. Chemistry 2022; 28:e202200462. [PMID: 35234313 PMCID: PMC9311437 DOI: 10.1002/chem.202200462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 02/12/2022] [Indexed: 11/06/2022]
Abstract
A radical anion −NO2.− is formed upon an electrochemically reversible one‐electron reduction of the square‐planar NiII complex of N‐nitrobenzylcyclam. The −NO2.− group goes to occupy an axial position of the metal ion, thus establishing a significant electronic interaction with the metal center. In particular, the ESR spectrum supports the occurrence of an electron transfer from −NO2.− to the metal, which therefore presents a significant NiI character. On re‐oxidation, the nitrobenzyl side chain detaches and the NiII complex is restored, providing an example of a fully reversible redox driven intramolecular motion.
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Affiliation(s)
| | - Luigi Fabbrizzi
- Dipartimento di Chimica Università di Pavia 27100 Pavia Italy
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Canziani L, Marenco M, Cavenaghi G, Manfrinato G, Taglietti A, Girella A, Aprile C, Pepe G, Lodola L. Chemical and Physical Characterisation of Macroaggregated Human Serum Albumin: Strength and Specificity of Bonds with 99mTc and 68Ga. Molecules 2022; 27:molecules27020404. [PMID: 35056719 PMCID: PMC8777888 DOI: 10.3390/molecules27020404] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 12/14/2021] [Revised: 01/03/2022] [Accepted: 01/04/2022] [Indexed: 12/14/2022]
Abstract
Background: Macroaggregated human serum albumin (MAA) properties are widely used in nuclear medicine, labelled with 99mTc. The aim of this study is to improve the knowledge about the morphology, size, dimension and physical–chemical characteristics of MAA and their bond with 99mTc and 68Ga. Methods: Commercial kits of MAA (Pulmocis®) were used. Characterisation through experiments based on SEM, DLS and Stokes’ Law were carried out. In vitro experiments for Langmuir isotherms and pH studies on radiolabelling were performed and the stability of the radiometal complex was verified through competition reactions. Results: The study settles the MAA dimension within the range 43–51 μm. The Langmuir isotherm reveals for [99mTc]MAA: Bmax (46.32), h (2.36); for [68Ga]MAA: Bmax (44.54), h (0.893). Dual labelling reveals that MAA does not discriminate different radioisotopes. Experiments on pH placed the optimal pH for labelling with 99mTc at 6. Conclusion: Radiolabelling of MAA is possible with high efficiency. The nondiscriminatory MAA bonds make this drug suitable for radiolabelling with different radioisotopes or for dual labelling. This finding illustrates the need to continue investigating MAA chemical and physical characteristics to allow for secure labelling with different isotopes.
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Affiliation(s)
- Letizia Canziani
- Fondazione IRCCS Policlinico San Matteo, Nuclear Medicine Unit, 27100 Pavia, Italy; (G.C.); (G.M.); (C.A.); (G.P.); (L.L.)
- Correspondence: (L.C.); (M.M.)
| | - Manuela Marenco
- Fondazione IRCCS Policlinico San Matteo, Nuclear Medicine Unit, 27100 Pavia, Italy; (G.C.); (G.M.); (C.A.); (G.P.); (L.L.)
- Correspondence: (L.C.); (M.M.)
| | - Giorgio Cavenaghi
- Fondazione IRCCS Policlinico San Matteo, Nuclear Medicine Unit, 27100 Pavia, Italy; (G.C.); (G.M.); (C.A.); (G.P.); (L.L.)
| | - Giulia Manfrinato
- Fondazione IRCCS Policlinico San Matteo, Nuclear Medicine Unit, 27100 Pavia, Italy; (G.C.); (G.M.); (C.A.); (G.P.); (L.L.)
| | - Angelo Taglietti
- Chemistry Department, University of Pavia, 27100 Pavia, Italy; (A.T.); (A.G.)
| | - Alessandro Girella
- Chemistry Department, University of Pavia, 27100 Pavia, Italy; (A.T.); (A.G.)
| | - Carlo Aprile
- Fondazione IRCCS Policlinico San Matteo, Nuclear Medicine Unit, 27100 Pavia, Italy; (G.C.); (G.M.); (C.A.); (G.P.); (L.L.)
| | - Giovanna Pepe
- Fondazione IRCCS Policlinico San Matteo, Nuclear Medicine Unit, 27100 Pavia, Italy; (G.C.); (G.M.); (C.A.); (G.P.); (L.L.)
| | - Lorenzo Lodola
- Fondazione IRCCS Policlinico San Matteo, Nuclear Medicine Unit, 27100 Pavia, Italy; (G.C.); (G.M.); (C.A.); (G.P.); (L.L.)
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Pallavicini P, Chirico G, Taglietti A. Frontispiece: Harvesting Light To Produce Heat: Photothermal Nanoparticles for Technological Applications and Biomedical Devices. Chemistry 2021. [DOI: 10.1002/chem.202186263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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)
- Piersandro Pallavicini
- Department of Chemistry Università degli Studi di Pavia v. Taramelli 12 27100 Pavia Italy
| | - Giuseppe Chirico
- Department of Physics “G. Occhialini” Università Milano Bicocca p.zza della Scienza 3 XX100 Milano Italy
| | - Angelo Taglietti
- Department of Chemistry Università degli Studi di Pavia v. Taramelli 12 27100 Pavia Italy
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Pallavicini P, Chirico G, Taglietti A. Harvesting Light To Produce Heat: Photothermal Nanoparticles for Technological Applications and Biomedical Devices. Chemistry 2021; 27:15361-15374. [PMID: 34406677 PMCID: PMC8597085 DOI: 10.1002/chem.202102123] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Indexed: 12/17/2022]
Abstract
The photothermal properties of nanoparticles (NPs), that is, their ability to convert absorbed light into heat, have been studied since the end of the last century, mainly on gold NPs. In the new millennium, these studies have developed into a burst of research dedicated to the photothermal ablation of tumors. However, beside this strictly medical theme, research has also flourished in the connected areas of photothermal antibacterial surface coatings, gels and polymers, of photothermal surfaces for cell stimulation, as well as in purely technological areas that do not involve medical biotechnology. These include the direct conversion of solar light into heat, a more efficient sun-powered generation of steam and the use of inkjet-printed patterns of photothermal NPs for anticounterfeit printing based on temperature reading, to cite but a few. After an analysis of the photothermal effect (PTE) and its mechanism, this minireview briefly considers the antitumor-therapy theme and takes an in-depth look at all the other technological and biomedical applications of the PTE, paying particular attention to photothermal materials whose NPs have joined those based on Au.
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Affiliation(s)
| | - Giuseppe Chirico
- Department of Physics “G. Occhialini”Università Milano Bicoccap.zza della Scienza 3XX100MilanoItaly
| | - Angelo Taglietti
- Department of ChemistryUniversità degli Studi di Paviav. Taramelli 1227100PaviaItaly
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14
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Talamona F, Truffi M, Caldarone AA, Ricciardi A, Corsi F, Pellegrini G, Morasso C, Taglietti A. Stable and scalable SERS tags conjugated with neutravidin for the detection of fibroblast activation protein (FAP) in primary fibroblasts. Nanotechnology 2021; 32:295703. [PMID: 33831854 DOI: 10.1088/1361-6528/abf5fd] [Citation(s) in RCA: 5] [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: 01/15/2021] [Accepted: 04/08/2021] [Indexed: 06/12/2023]
Abstract
SERS tags are a class of nanoparticles with great potential in advanced imaging experiments. The preparation of SERS tags however is complex, as they suffer from the high variability of the SERS signals observed even at the slightest sign of aggregation. Here, we developed a method for the preparation of SERS tags based on the use of gold nanostars conjugated with neutravidin. The SERS tags here obtained are extremely stable in all biological buffers commonly employed and can be prepared at a relatively large scale in very mild conditions. The obtained SERS tags have been used to monitor the expression of fibroblast activation protein alpha (FAP) on the membrane of primary fibroblasts obtained from patients affected by Crohn's disease. The SERS tags allowed the unambiguous identification of FAP on the surface of cells thus suggesting the feasibility of semi-quantitative analysis of the target protein. Moreover, the use of the neutravidin-biotin system allows to apply the SERS tags for any other marker detection, for example, different cancer cell types, simply by changing the biotinylated antibody chosen in the analysis.
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Affiliation(s)
- Federica Talamona
- Department of Chemistry, University of Pavia, Viale Taramelli 12, I-27100 Pavia, Italy
- Istituti Clinici Scientifici Maugeri IRCCS, Via Maugeri 4, I-27100 Pavia, Italy
| | - Marta Truffi
- Istituti Clinici Scientifici Maugeri IRCCS, Via Maugeri 4, I-27100 Pavia, Italy
| | | | | | - Fabio Corsi
- Istituti Clinici Scientifici Maugeri IRCCS, Via Maugeri 4, I-27100 Pavia, Italy
- Department of Biomedical and Clinical Sciences 'Luigi Sacco', Università degli Studi di Milano, Milano, Italy
| | - Giovanni Pellegrini
- Department of Physics, University of Pavia, Via Bassi 6, I-27100 Pavia, Italy
| | - Carlo Morasso
- Istituti Clinici Scientifici Maugeri IRCCS, Via Maugeri 4, I-27100 Pavia, Italy
| | - Angelo Taglietti
- Department of Chemistry, University of Pavia, Viale Taramelli 12, I-27100 Pavia, Italy
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15
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Barzan G, Rocchetti L, Portesi C, Pellegrino F, Taglietti A, Rossi AM, Giovannozzi AM. Surface Minimal Bactericidal Concentration: A comparative study of active glasses functionalized with different-sized silver nanoparticles. Colloids Surf B Biointerfaces 2021; 204:111800. [PMID: 33945966 DOI: 10.1016/j.colsurfb.2021.111800] [Citation(s) in RCA: 6] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 04/20/2021] [Accepted: 04/26/2021] [Indexed: 11/27/2022]
Abstract
In this work the quantification of antimicrobial properties of differently sized AgNPs immobilized on a surface was studied. Three different sizes of spheroidal AgNPs with a diameter of (6, 30 and 52) nm were synthetized and characterized with UV-vis, SEM, TEM and ICP-MS. The MIC (Minimal Inhibitory Concentration) and MBC (Minimal Bactericidal Concentration) against Escherichia coli were investigated. Then, the antibacterial efficacy (R) of amino-silanized glasses coated with different amounts of the three sizes of AgNPs were quantified by international standard ISO 22196 adapted protocol against E. coli, clarifying the relationship between size and antibacterial properties of immobilized AgNPs on a surface. The total amount of silver present on glasses with an R ∼ 6 for each AgNPs size was quantified with ICP-MS and this was considered the Surface MBC (SMBC), which were found to be (0.023, 0.026 and 0.034) μg/cm2 for (6, 30 and 52) nm AgNPs, respectively. Thus, this study demonstrates that active surfaces with a bactericidal effect at least ≥ 99.9999 % could be obtained using an amount of silver almost 100 times lower than the MBC found for colloidal AgNPs. The immobilization reduces the aggregation phenomena normally occuring in liquid media, maximizing the exposed specific superficial area of the AgNPs and their direct contact with bacterial cells. Starting from this glass model system, our work could broaden the way to the development of a wide range of antibacterial materials with very low amount of silver that can be safely applied in biomedical and food packaging fields.
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Affiliation(s)
- Giulia Barzan
- Quantum Metrology and Nanotechnology Division, Istituto Nazionale di Ricerca Metrologica (INRiM), Strada delle Cacce, 91, 10135, Turin, Italy; Departement of Electronics and Telecommunications, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129, Turin, Italy
| | - Luca Rocchetti
- Department of Chemistry and NIS Inter-Departmental Centre, University of Torino, Via Pietro Giuria, 9, 10125, Turin, Italy
| | - Chiara Portesi
- Quantum Metrology and Nanotechnology Division, Istituto Nazionale di Ricerca Metrologica (INRiM), Strada delle Cacce, 91, 10135, Turin, Italy
| | - Francesco Pellegrino
- Department of Chemistry and NIS Inter-Departmental Centre, University of Torino, Via Pietro Giuria, 9, 10125, Turin, Italy
| | - Angelo Taglietti
- Department of Chemistry, General Chemistry Section, University of Pavia, viale Taramelli, 12, 27100, Pavia, Italy
| | - Andrea Mario Rossi
- Quantum Metrology and Nanotechnology Division, Istituto Nazionale di Ricerca Metrologica (INRiM), Strada delle Cacce, 91, 10135, Turin, Italy
| | - Andrea Mario Giovannozzi
- Quantum Metrology and Nanotechnology Division, Istituto Nazionale di Ricerca Metrologica (INRiM), Strada delle Cacce, 91, 10135, Turin, Italy.
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D'Agostino A, Giovannozzi AM, Mandrile L, Sacco A, Rossi AM, Taglietti A. In situ seed-growth synthesis of silver nanoplates on glass for the detection of food contaminants by surface enhanced Raman scattering. Talanta 2020; 216:120936. [DOI: 10.1016/j.talanta.2020.120936] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 03/12/2020] [Accepted: 03/14/2020] [Indexed: 12/24/2022]
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17
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Borzenkov M, Pallavicini P, Taglietti A, D’Alfonso L, Collini M, Chirico G. Photothermally active nanoparticles as a promising tool for eliminating bacteria and biofilms. Beilstein J Nanotechnol 2020; 11:1134-1146. [PMID: 32802716 PMCID: PMC7404213 DOI: 10.3762/bjnano.11.98] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Accepted: 06/29/2020] [Indexed: 05/11/2023]
Abstract
Bacterial contamination is a severe issue that affects medical devices, hospital tools and surfaces. When microorganisms adhere to a surface (e.g., medical devices or implants) they can develop into a biofilm, thereby becoming more resistant to conventional biocides and disinfectants. Nanoparticles can be used as an antibacterial agent in medical instruments or as a protective coating in implantable devices. In particular, attention is being drawn to photothermally active nanoparticles that are capable of converting absorbed light into heat. These nanoparticles can efficiently eradicate bacteria and biofilms upon light activation (predominantly near the infrared to near-infrared spectral region) due a rapid and pronounced local temperature increase. By using this approach new, protective, antibacterial surfaces and materials can be developed that can be remotely activated on demand. In this review, we summarize the state-of-the art regarding the application of various photothermally active nanoparticles and their corresponding nanocomposites for the light-triggered eradication of bacteria and biofilms.
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Affiliation(s)
- Mykola Borzenkov
- Department of Medicine and Surgery, Nanomedicine Center, University of Milano-Bicocca, piazza dell’Ateneo Nuovo, 20126, Milan, Italy
| | | | - Angelo Taglietti
- Department of Chemistry, University of Pavia, via Taramelli 12, 27100, Pavia, Italy
| | - Laura D’Alfonso
- Department of Physics, University of Milano-Bicocca, piazza dell’Ateneo Nuovo, 20126, Milan, Italy
| | - Maddalena Collini
- Department of Physics, University of Milano-Bicocca, piazza dell’Ateneo Nuovo, 20126, Milan, Italy
| | - Giuseppe Chirico
- Department of Physics, University of Milano-Bicocca, piazza dell’Ateneo Nuovo, 20126, Milan, Italy
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18
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Rovati D, Albini B, Galinetto P, Grisoli P, Bassi B, Pallavicini P, Dacarro G, Taglietti A. High Stability Thiol-Coated Gold Nanostars Monolayers with Photo-Thermal Antibacterial Activity and Wettability Control. Nanomaterials (Basel) 2019; 9:E1288. [PMID: 31505833 PMCID: PMC6781089 DOI: 10.3390/nano9091288] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/05/2019] [Accepted: 09/06/2019] [Indexed: 11/19/2022]
Abstract
The adhesion and proliferation of bacteria on abiotic surfaces pose challenges in both health care and industrial applications. Gold nanostars (GNSs) monolayers grafted on glass have demonstrated to exert antibacterial action due to their photo-thermal features. Here, these GNS layers were further functionalized using thiols monolayers, in order to impart different wettability to the surfaces and thus adding a feature that could help to fight bacterial proliferation. Thiol that has different functional groups was used and the thiol-protected surfaces were characterized by means of UV-vis spectroscopy, contact angles, SEM and surface enhanced Raman spectroscopy (SERS). We verified that (i) coating with the proper thiol allows us to impart high hydrophilicity or hydrophobicity to the surfaces (with contact angle values ranging from 10 to 120°); (ii) GNS monolayers are strongly stabilized by functionalization with thiols, with shelf stability increasing from a few weeks to more than three months and (iii) photo-thermal features and subsequent antibacterial effects caused by hyperthermia are not changed by thiols layers, allowing us to kill at least 99.99% of representative bacterial strains.
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Affiliation(s)
- Davide Rovati
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Benedetta Albini
- Department of Physics, University of Pavia, Via Bassi 6, 27100 Pavia, Italy
| | - Pietro Galinetto
- Department of Physics, University of Pavia, Via Bassi 6, 27100 Pavia, Italy
| | - Pietro Grisoli
- Department of Drug Sciences, University of Pavia, Viale Taramelli 14, 27100 Pavia, Italy
| | - Barbara Bassi
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | | | - Giacomo Dacarro
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Angelo Taglietti
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy.
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19
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Taglietti A, Dacarro G, Barbieri D, Cucca L, Grisoli P, Patrini M, Arciola CR, Pallavicini P. High Bactericidal Self-Assembled Nano-Monolayer of Silver Sulfadiazine on Hydroxylated Material Surfaces. Materials (Basel) 2019; 12:ma12172761. [PMID: 31466275 PMCID: PMC6748069 DOI: 10.3390/ma12172761] [Citation(s) in RCA: 10] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/14/2019] [Revised: 08/17/2019] [Accepted: 08/19/2019] [Indexed: 02/06/2023]
Abstract
Anti-infective surfaces are a modern strategy to address the issue of infection related to the clinical use of materials for implants and medical devices. Nanocoatings, with their high surface/mass ratio, lend themselves to being mono-layered on the material surfaces to release antibacterial molecules and prevent bacterial adhesion. Here, a “layer-by-layer” (LbL) approach to achieve a self-assembled monolayer (SAM) with high microbicidal effect on hydroxylated surfaces is presented, exploiting the reaction between a monolayer of thiolic functions on glass/quartz surfaces and a newly synthesized derivative of the well-known antibacterial compound silver sulfadiazine. Using several different techniques, it is demonstrated that a nano-monolayer of silver sulfadiazine is formed on the surfaces. The surface-functionalized materials showed efficient bactericidal effect against both Gram-positive and Gram-negative bacteria. Interestingly, bactericidal self-assembled nano-monolayers of silver sulfadiazine could be achieved on a large variety of materials by simply pre-depositing glass-like SiO2 films on their surfaces.
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Affiliation(s)
- Angelo Taglietti
- Dipartimento di Chimica, Sezione di Chimica Generale, Università di Pavia, viale Taramelli 12, 27100 Pavia, Italy.
| | - Giacomo Dacarro
- Dipartimento di Chimica, Sezione di Chimica Generale, Università di Pavia, viale Taramelli 12, 27100 Pavia, Italy.
| | - Daniele Barbieri
- Dipartimento di Chimica, Sezione di Chimica Generale, Università di Pavia, viale Taramelli 12, 27100 Pavia, Italy
| | - Lucia Cucca
- Dipartimento di Chimica, Sezione di Chimica Generale, Università di Pavia, viale Taramelli 12, 27100 Pavia, Italy
| | - Pietro Grisoli
- Dipartimento di Scienze del Farmaco, Università di Pavia, viale Taramelli 10, 27100 Pavia, Italy
| | - Maddalena Patrini
- Dipartimento di Fisica, "A. Volta", Università di Pavia, via Bassi 6, 27100 Pavia, Italy
| | - Carla Renata Arciola
- Laboratorio di Patologia delle Infezioni Associate all'Impianto, IRCCS Istituto Ortopedico Rizzoli, via di Barbiano 1/10, 40136 Bologna, Italy.
- Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, via San Giacomo 14, 40126 Bologna, Italy.
| | - Piersandro Pallavicini
- Dipartimento di Chimica, Sezione di Chimica Generale, Università di Pavia, viale Taramelli 12, 27100 Pavia, Italy
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Borzenkov M, D'Alfonso L, Polissi A, Sperandeo P, Collini M, Dacarro G, Taglietti A, Chirico G, Pallavicini P. Novel photo-thermally active polyvinyl alcohol-Prussian blue nanoparticles hydrogel films capable of eradicating bacteria and mitigating biofilms. Nanotechnology 2019; 30:295702. [PMID: 31025630 DOI: 10.1088/1361-6528/ab15f9] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Antibacterial treatment is an essential issue in many diverse fields, from medical device treatments (for example prostheses coating) to food preservation. However, there is a need of novel and light-weight materials with high antibacterial efficiency (preferably due to the physical activation). Utilization of photo-thermally active nanoparticles can lead to novel and re-usable materials that can be remotely activated on-demand to thermally eradicate bacteria and mitigate biofilm formation, therefore meeting the above challenge. In this study polyvinyl alcohol (PVA) hydrogel films containing non-toxic and highly photo-thermally active Prussian blue (PB) nanoparticles were fabricated. The confocal microscopy studies indicated a uniform nanoparticle distribution and a low degree of aggregation. Upon near-infrared (NIR; 700 and 800 nm) light irradiation of PVA-PB films, the local temperature increases rapidly and reaches a plateau (up to ΔT ≅ 78 °C), within ≈6-10 s under relatively low laser intensities, I ≅ 0.3 W cm-2. The high and localized increase of temperature on the fabricated films resulted in an efficient antibacterial effect on Pseudomonas aeruginosa (P. aeruginosa) bacteria. In addition, the localized photo-thermal effect was also sufficient to substantially mitigate biofilms growth.
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Affiliation(s)
- Mykola Borzenkov
- Department of Medicine and Surgery, Nanomedicine Center, University of Milano-Bicocca, Piazza dell' Ateneo Nuovo, I-20126, Milan, Italy
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21
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Bassi B, Albini B, D'Agostino A, Dacarro G, Pallavicini P, Galinetto P, Taglietti A. Robust, reproducible, recyclable SERS substrates: monolayers of gold nanostars grafted on glass and coated with a thin silica layer. Nanotechnology 2019; 30:025302. [PMID: 30411711 DOI: 10.1088/1361-6528/aae9b3] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We prepared and characterized recyclable surface enhanced Raman spectroscopy (SERS) active glass chips. Gold nanostars were grafted on properly functionalized glasses by means of electrostatic interactions and then they were coated with a silica layer of controllable thickness in the nanometer range. The SERS activity of the obtained substrates were tested in terms of reproducibility and homogeneity intra-samples and inter-samples from different batches using the Raman reporter as the model compound rhodamine 6G. The uncoated substrates were used as reference to evaluate the effect of silica spacers on SERS enhancement factors (EFs). The chemical route to obtain silica-coated SERS chips is described in detail, and the morphology and the optical response of substrates have been characterized. We demonstrate that SERS substrates coated with 1 nm silica conserve a good EF, and that the coating confers to the SERS platform an extreme robustness leading to reusability of the substrates.
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Affiliation(s)
- B Bassi
- Dipartimento di Chimica, Sezione di Chimica Generale, Università di Pavia, viale Taramelli, 12, I-27100 Pavia, Italy
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Pallavicini P, Dacarro G, Taglietti A. Self-Assembled Monolayers of Silver Nanoparticles: From Intrinsic to Switchable Inorganic Antibacterial Surfaces. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800709] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
| | - Giacomo Dacarro
- Department of Chemistry; University of Pavia; viale Taramelli, 12 - 27100 Pavia Italy
| | - Angelo Taglietti
- Department of Chemistry; University of Pavia; viale Taramelli, 12 - 27100 Pavia Italy
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Abstract
Prussian blue (PB) is a coordination polymer studied since the early 18th century, historically known as a pigment. PB can be prepared in colloidal form with a straightforward synthesis. It has a strong charge-transfer absorption centered at ~700 nm, with a large tail in the Near-IR range. Irradiation of this band results in thermal relaxation and can be exploited to generate a local hyperthermia by irradiating in the so-called bio-transparent Near-IR window. PB nanoparticles are fully biocompatible (PB has already been approved by FDA) and biodegradable, this making them ideal candidates for in vivo use. While papers based on the imaging, drug-delivery and absorbing properties of PB nanoparticles have appeared and have been reviewed in the past decades, a very recent interest is flourishing with the use of PB nanoparticles as photothermal agents in biomedical applications. This review summarizes the syntheses and the optical features of PB nanoparticles in relation to their photothermal use and describes the state of the art of PB nanoparticles as photothermal agents, also in combination with diagnostic techniques.
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Affiliation(s)
- Giacomo Dacarro
- inLAB-Inorganic Nanochemistry Laboratory, Dipartimento di Chimica, Università di Pavia, 27100 Pavia, Italy.
| | - Angelo Taglietti
- inLAB-Inorganic Nanochemistry Laboratory, Dipartimento di Chimica, Università di Pavia, 27100 Pavia, Italy.
| | - Piersandro Pallavicini
- inLAB-Inorganic Nanochemistry Laboratory, Dipartimento di Chimica, Università di Pavia, 27100 Pavia, Italy.
- CHT, Centre for Health Technologies, Università di Pavia, 27100 Pavia, Italy.
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24
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Bassi B, Dacarro G, Galinetto P, Giulotto E, Marchesi N, Pallavicini P, Pascale A, Perversi S, Taglietti A. Tailored coating of gold nanostars: rational approach to prototype of theranostic device based on SERS and photothermal effects at ultralow irradiance. Nanotechnology 2018; 29:235301. [PMID: 29547134 DOI: 10.1088/1361-6528/aab74f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The last decade has come across an increasing demand for theranostic biocompatible nanodevices possessing the double ability of diagnosis and therapy. In this work, we report the design, synthesis and step-by-step characterization of rationally coated gold nanostars (GNSs) for the SERS imaging and photothermal therapy of HeLa cancer cells. The nanodevices were realized by synthesizing GNSs with a seed growth approach, coating them with a controlled mixture of thiols composed of a Raman reporter and a polyethylene glycol with a terminal amino group, and then reacting these amino groups with folic acid (FA), in order to impart selectivity towards cancer cells which overexpress folate receptors on their membranes. After a complete characterization, we demonstrate that these FA-functionalized GNSs (FA-GNSs) are able to bind selectively to the membranes of HeLa cells, acting as SERS tags and allowing SERS imaging. Moreover, we demonstrate that once bound to HeLa cell membranes, FA-GNSs exhibit photothermal effect which can be exploited to kill the same cells in vitro using laser irradiation in the NIR at a very low and safe irradiance. We thus demonstrate that the FA-GNSs designed following the described approach are an efficient prototype of theranostic nanodevices.
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Affiliation(s)
- B Bassi
- Dipartimento di Chimica, Sezione di Chimica Generale, Università di Pavia, viale Taramelli, 12-27100 Pavia, Italy
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25
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Borzenkov M, Moros M, Tortiglione C, Bertoldi S, Contessi N, Faré S, Taglietti A, D’Agostino A, Pallavicini P, Collini M, Chirico G. Fabrication of photothermally active poly(vinyl alcohol) films with gold nanostars for antibacterial applications. Beilstein J Nanotechnol 2018; 9:2040-2048. [PMID: 30116694 PMCID: PMC6071708 DOI: 10.3762/bjnano.9.193] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 07/11/2018] [Indexed: 05/02/2023]
Abstract
The unique photothermal properties of non-spherical gold nanoparticles under near-infrared (NIR) irradiation find broad application in nanotechnology and nanomedicine. The combination of their plasmonic features with widely used biocompatible poly(vinyl alcohol) (PVA) films can lead to novel hybrid polymeric materials with tunable photothermal properties and a wide range of applications. In this study, thin PVA films containing highly photothermally efficient gold nanostars (GNSs) were fabricated and their properties were studied. The resulting films displayed good mechanical properties and a pronounced photothermal effect under NIR irradiation. The local photothermal effect triggered by NIR irradiation of the PVA-GNS films is highly efficient at killing bacteria, therefore providing an opportunity to develop new types of protective antibacterial films and coatings.
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Affiliation(s)
- Mykola Borzenkov
- Department of Medicine and Surgery, Nanomedicine Center, University of Milano-Bicocca, Piazza dell’Ateneo Nuovo, 20126, Milan, Italy
| | - Maria Moros
- Institute of Applied Sciences and Intelligent Systems, National Research Council of Italy, Via Campi-Flegrei 34, 80078, Pozzuoli, Italy
| | - Claudia Tortiglione
- Institute of Applied Sciences and Intelligent Systems, National Research Council of Italy, Via Campi-Flegrei 34, 80078, Pozzuoli, Italy
| | - Serena Bertoldi
- Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Piazza Leonardo da Vinci 32, 20133, Milan, Italy
- Local Unit Politecnico di Milano, INSTM, Consorzio Nazionale di Scienza e Tecnologia dei Materiali, Milan, Italy
| | - Nicola Contessi
- Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Piazza Leonardo da Vinci 32, 20133, Milan, Italy
- Local Unit Politecnico di Milano, INSTM, Consorzio Nazionale di Scienza e Tecnologia dei Materiali, Milan, Italy
| | - Silvia Faré
- Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Piazza Leonardo da Vinci 32, 20133, Milan, Italy
- Local Unit Politecnico di Milano, INSTM, Consorzio Nazionale di Scienza e Tecnologia dei Materiali, Milan, Italy
| | - Angelo Taglietti
- Department of Chemistry and Centre for Health Technology, University of Pavia, Viale Taramelli 12, 27100, Pavia, Italy
| | - Agnese D’Agostino
- Department of Chemistry and Centre for Health Technology, University of Pavia, Viale Taramelli 12, 27100, Pavia, Italy
| | - Piersandro Pallavicini
- Department of Chemistry and Centre for Health Technology, University of Pavia, Viale Taramelli 12, 27100, Pavia, Italy
| | - Maddalena Collini
- Department of Medicine and Surgery, Nanomedicine Center, University of Milano-Bicocca, Piazza dell’Ateneo Nuovo, 20126, Milan, Italy
- Department of Physics “G. Occhialini”, University of Milano-Bicocca, Piazza dell’AteneoNuovo, 20126, Milan, Italy
| | - Giuseppe Chirico
- Department of Medicine and Surgery, Nanomedicine Center, University of Milano-Bicocca, Piazza dell’Ateneo Nuovo, 20126, Milan, Italy
- Department of Physics “G. Occhialini”, University of Milano-Bicocca, Piazza dell’AteneoNuovo, 20126, Milan, Italy
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Taglietti A, Grisoli P, Dacarro G, Gattesco A, Mangano C, Pallavicini P. Grafted monolayers of the neutral Cu( ii) complex of a dioxo-2,3,2 ligand: surfaces with decreased antibacterial action. NEW J CHEM 2018. [DOI: 10.1039/c7nj04601d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [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 monolayer of the neutral Cu2+ complex of a silane-bearing diamino–diamido ligand is formed on glass, exhibiting (decreased) antibacterial properties.
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Affiliation(s)
- A. Taglietti
- Dipartimento di Chimica
- Università di Pavia
- Pavia
- Italy
| | - P. Grisoli
- Dipartimento di Scienze del Farmaco
- Università di Pavia
- Pavia
- Italy
| | - G. Dacarro
- Dipartimento di Chimica
- Università di Pavia
- Pavia
- Italy
| | - A. Gattesco
- Dipartimento di Chimica
- Università di Pavia
- Pavia
- Italy
| | - C. Mangano
- Dipartimento di Chimica
- Università di Pavia
- Pavia
- Italy
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Dacarro G, Grisoli P, Borzenkov M, Milanese C, Fratini E, Ferraro G, Taglietti A, Pallavicini P. Self-assembled monolayers of Prussian blue nanoparticles with photothermal effect. Supramol Chem 2017. [DOI: 10.1080/10610278.2017.1372582] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
| | - Pietro Grisoli
- Drug Science Department, University of Pavia, Pavia, Italy
| | - Mykola Borzenkov
- Department of Medicine and Surgery, Center of Nanomedicine, University of Milano Bicocca, Milano, Italy
| | | | - Emiliano Fratini
- Department of Chemistry ‘Ugo Schiff’ and CSGI, University of Firenze, Firenze, Italy
| | - Giovanni Ferraro
- Department of Chemistry ‘Ugo Schiff’ and CSGI, University of Firenze, Firenze, Italy
| | | | - Piersandro Pallavicini
- Department of Chemistry, University of Pavia, Pavia, Italy
- CHT (Centre for Health Technology), University of Pavia, Pavia, Italy
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Pallavicini P, Bassi B, Chirico G, Collini M, Dacarro G, Fratini E, Grisoli P, Patrini M, Sironi L, Taglietti A, Moritz M, Sorzabal-Bellido I, Susarrey-Arce A, Latter E, Beckett AJ, Prior IA, Raval R, Diaz Fernandez YA. Modular approach for bimodal antibacterial surfaces combining photo-switchable activity and sustained biocidal release. Sci Rep 2017; 7:5259. [PMID: 28701753 PMCID: PMC5507905 DOI: 10.1038/s41598-017-05693-3] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 05/22/2017] [Indexed: 02/06/2023] Open
Abstract
Photo-responsive antibacterial surfaces combining both on-demand photo-switchable activity and sustained biocidal release were prepared using sequential chemical grafting of nano-objects with different geometries and functions. The multi-layered coating developed incorporates a monolayer of near-infrared active silica-coated gold nanostars (GNS) decorated by silver nanoparticles (AgNP). This modular approach also enables us to unravel static and photo-activated contributions to the overall antibacterial performance of the surfaces, demonstrating a remarkable synergy between these two mechanisms. Complementary microbiological and imaging evaluations on both planktonic and surface-attached bacteria provided new insights on these distinct but cooperative effects.
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Affiliation(s)
- Piersandro Pallavicini
- Department of Chemistry and Centre for Health Technology, University of Pavia, Pavia, Italy.
| | - Barbara Bassi
- Department of Chemistry and Centre for Health Technology, University of Pavia, Pavia, Italy
| | | | | | - Giacomo Dacarro
- Department of Chemistry and Centre for Health Technology, University of Pavia, Pavia, Italy
| | - Emiliano Fratini
- Department of Chemistry "Ugo Schiff" and CSGI, University of Florence, Florence, Italy
| | - Pietro Grisoli
- Department of Pharmaceutical Sciences, University of Pavia, Pavia, Italy
| | | | - Laura Sironi
- Department of Physics, University Milano-Bicocca, Milano, Italy
| | - Angelo Taglietti
- Department of Chemistry and Centre for Health Technology, University of Pavia, Pavia, Italy.
| | - Marcel Moritz
- Open Innovation Hub for Antimicrobial Surfaces, University of Liverpool, Liverpool, UK
| | | | - Arturo Susarrey-Arce
- Open Innovation Hub for Antimicrobial Surfaces, University of Liverpool, Liverpool, UK
| | - Edward Latter
- Open Innovation Hub for Antimicrobial Surfaces, University of Liverpool, Liverpool, UK
| | - Alison J Beckett
- Biomedical EM Unit, School of Biomedical Sciences, University of Liverpool, Liverpool, UK
| | - Ian A Prior
- Biomedical EM Unit, School of Biomedical Sciences, University of Liverpool, Liverpool, UK
| | - Rasmita Raval
- Open Innovation Hub for Antimicrobial Surfaces, University of Liverpool, Liverpool, UK.
| | - Yuri A Diaz Fernandez
- Open Innovation Hub for Antimicrobial Surfaces, University of Liverpool, Liverpool, UK.
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29
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Sardo C, Bassi B, Craparo EF, Scialabba C, Cabrini E, Dacarro G, D’Agostino A, Taglietti A, Giammona G, Pallavicini P, Cavallaro G. Gold nanostar–polymer hybrids for siRNA delivery: Polymer design towards colloidal stability and in vitro studies on breast cancer cells. Int J Pharm 2017; 519:113-124. [DOI: 10.1016/j.ijpharm.2017.01.022] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 01/09/2017] [Accepted: 01/10/2017] [Indexed: 10/20/2022]
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D'Agostino A, Taglietti A, Desando R, Bini M, Patrini M, Dacarro G, Cucca L, Pallavicini P, Grisoli P. Bulk Surfaces Coated with Triangular Silver Nanoplates: Antibacterial Action Based on Silver Release and Photo-Thermal Effect. Nanomaterials (Basel) 2017; 7:E7. [PMID: 28336841 PMCID: PMC5295197 DOI: 10.3390/nano7010007] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 12/05/2016] [Accepted: 12/30/2016] [Indexed: 01/17/2023]
Abstract
A layer of silver nanoplates, specifically synthesized with the desired localized surface plasmon resonance (LSPR) features, was grafted on amino-functionalized bulk glass surfaces to impart a double antibacterial action: (i) the well-known, long-term antibacterial effect based on the release of Ag⁺; (ii) an "on demand" action which can be switched on by the use of photo-thermal properties of silver nano-objects. Irradiation of these samples with a laser having a wavelength falling into the so called "therapeutic window" of the near infrared region allows the reinforcement, in the timescale of minutes, of the classical antibacterial effect of silver nanoparticles. We demonstrate how using the two actions allows for almost complete elimination of the population of two bacterial strains of representative Gram-positive and Gram-negative bacteria.
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Affiliation(s)
- Agnese D'Agostino
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy.
| | - Angelo Taglietti
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy.
| | - Roberto Desando
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy.
| | - Marcella Bini
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy.
| | - Maddalena Patrini
- Department of Physics, University of Pavia, Via Bassi 6, 27100 Pavia, Italy.
| | - Giacomo Dacarro
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy.
- Department of Physics, University of Pavia, Via Bassi 6, 27100 Pavia, Italy.
| | - Lucia Cucca
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy.
| | | | - Pietro Grisoli
- Department of Drug Sciences, University of Pavia, Viale Taramelli 14, 27100 Pavia, Italy.
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Bassi B, Taglietti A, Galinetto P, Marchesi N, Pascale A, Cabrini E, Pallavicini P, Dacarro G. Tunable coating of gold nanostars: tailoring robust SERS labels for cell imaging. Nanotechnology 2016; 27:265302. [PMID: 27199302 DOI: 10.1088/0957-4484/27/26/265302] [Citation(s) in RCA: 9] [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: 06/05/2023]
Abstract
Surface modification of noble metal nanoparticles with mixed molecular monolayers is one of the most powerful tools in nanotechnology, and is used to impart and tune new complex surface properties. In imaging techniques based on surface enhanced Raman spectroscopy (SERS), precise and controllable surface modifications are needed to carefully design reproducible, robust and adjustable SERS nanoprobes. We report here the attainment of SERS labels based on gold nanostars (GNSs) coated with a mixed monolayer composed of a poly ethylene glycol (PEG) thiol (neutral or negatively charged) that ensure stability in biological environments, and of a signalling unit 7-Mercapto-4-methylcoumarin as a Raman reporter molecule. The composition of the coating mixture is precisely controlled using an original method, allowing the modulation of the SERS intensity and ensuring overall nanoprobe stability. The further addition of a positively charged layer of poly (allylamine hydrocloride) on the surface of negatively charged SERS labels does not change the SERS response, but it promotes the penetration of GNSs in SH-SY5Y neuroblastoma cells. As an example of an application of such an approach, we demonstrate here the internalization of these new labels by means of visualization of cell morphology obtained with SERS mapping.
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Affiliation(s)
- B Bassi
- Dipartimento di Chimica, Sezione di Chimica Generale, Università di Pavia, Viale Taramelli 12, I-27100 Pavia, Italy
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32
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Pallavicini P, Amendola V, Bergamaschi G, Cabrini E, Dacarro G, Rossi N, Taglietti A. A bistren cryptand with a remote thioether function: Cu(ii) complexation in solution and on the surface of gold nanostars. NEW J CHEM 2016. [DOI: 10.1039/c5nj03175c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [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 di-copper(ii) complex is formed in a bis-tren cage featuring a thioether function, capable of grafting on a monolayer of gold nanostars.
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Affiliation(s)
| | - Valeria Amendola
- Dipartimento di Chimica
- Università degli Studi di Pavia
- 27100 Pavia
- Italy
| | - Greta Bergamaschi
- Dipartimento di Chimica
- Università degli Studi di Pavia
- 27100 Pavia
- Italy
| | - Elisa Cabrini
- Dipartimento di Chimica
- Università degli Studi di Pavia
- 27100 Pavia
- Italy
| | - Giacomo Dacarro
- Dipartimento di Chimica
- Università degli Studi di Pavia
- 27100 Pavia
- Italy
- Dipartimento di Fisica
| | - Nadia Rossi
- Dipartimento di Chimica
- Università degli Studi di Pavia
- 27100 Pavia
- Italy
| | - Angelo Taglietti
- Dipartimento di Chimica
- Università degli Studi di Pavia
- 27100 Pavia
- Italy
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33
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D'Agostino A, Taglietti A, Grisoli P, Dacarro G, Cucca L, Patrini M, Pallavicini P. Seed mediated growth of silver nanoplates on glass: exploiting the bimodal antibacterial effect by near IR photo-thermal action and Ag+ release. RSC Adv 2016. [DOI: 10.1039/c6ra11608f] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Silver nanoplates synthesized with the desired features directly on glass show a bimodal antibacterial action: Ag+ release and NIR laser switchable hyperthermia.
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Affiliation(s)
- A. D'Agostino
- Department of Chemistry
- University of Pavia
- 27100 Pavia
- Italy
| | - A. Taglietti
- Department of Chemistry
- University of Pavia
- 27100 Pavia
- Italy
| | - P. Grisoli
- Department of Drug Sciences
- University of Pavia
- 27100 Pavia
- Italy
| | - G. Dacarro
- Department of Physics
- University of Pavia
- 27100 Pavia
- Italy
| | - L. Cucca
- Department of Chemistry
- University of Pavia
- 27100 Pavia
- Italy
| | - M. Patrini
- Department of Physics
- University of Pavia
- 27100 Pavia
- Italy
| | - P. Pallavicini
- Department of Chemistry
- University of Pavia
- 27100 Pavia
- Italy
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34
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Pallavicini P, Bernhard C, Chirico G, Dacarro G, Denat F, Donà A, Milanese C, Taglietti A. Gold nanostars co-coated with the Cu(II) complex of a tetraazamacrocyclic ligand. Dalton Trans 2015; 44:5652-61. [PMID: 25708886 DOI: 10.1039/c4dt03042g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The twelve-membered tetraazamacrocyclic ligand L1 bears an appended lipoic acid unit, whose disulphide ring is an efficient grafting moiety for the surface of gold nanostars (GNS). The GNS that were used featured a localized surface plasmon resonance (LSPR) absorption at ∼800 nm, i.e. in the near infrared (NIR). We investigated different approaches for coating them with the Cu(2+) complex of L1. While the direct reaction of [CuL1](2+) with as-prepared GNS led to aggregation, an initial coating step with polyethyleneglycol-thiol (PEG-SH) was found to be advantageous. Displacement reactions were carried out on pegylated GNS either with [CuL1](2+), directly generating [Cun(L1@GNS)](2n+), or with void L1, thus obtaining @GNS that coordinates Cu(2+) in a second step. In both cases, even with a large excess of the competing disulphide moiety, only partial displacement of PEG-SH is observed, obtaining ca. 500-1500 [CuL1](2+) per GNS depending on the conditions, with PEG-SH remaining in the [Cun(L1@GNS)](2n+) hybrids and imparting them with remarkable stability. Comparison of the photothermal and two-photon luminescence (TPL) properties of the GNS between the pegylated GNS and [Cun(L1@GNS)](2n+) revealed that the grafted copper complex does not change them to any extent. Finally, the stability against demetallation and transmetallation of the complexes, as well as the fast kinetics of complexation of the monodispersed macrocycle and of L1@GNS, have been examined, suggesting [Cun(L1@GNS)](2n+) as a device capable of TPL optical tracking and NIR photothermal therapy and as a possible agent for PET imaging.
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Pallavicini P, Basile S, Chirico G, Dacarro G, D'Alfonso L, Donà A, Patrini M, Falqui A, Sironi L, Taglietti A. Monolayers of gold nanostars with two near-IR LSPRs capable of additive photothermal response. Chem Commun (Camb) 2015; 51:12928-30. [PMID: 26179941 DOI: 10.1039/c5cc04144a] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [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
Monolayers of photothermally responsive gold nanostars on PEI-coated surfaces display two localized surface plasmon resonances (LSPRs) in the near-IR region that can be laser-irradiated either separately, obtaining two different T jumps, or simultaneously, obtaining a T jump equal to the sum of those obtained with separate irradiations.
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36
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Pallavicini P, Cabrini E, Cavallaro G, Chirico G, Collini M, D'Alfonso L, Dacarro G, Donà A, Marchesi N, Milanese C, Pascale A, Sironi L, Taglietti A. Gold nanostars coated with neutral and charged polyethylene glycols: A comparative study of in-vitro biocompatibility and of their interaction with SH-SY5Y neuroblastoma cells. J Inorg Biochem 2015; 151:123-31. [DOI: 10.1016/j.jinorgbio.2015.05.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 04/30/2015] [Accepted: 05/02/2015] [Indexed: 01/07/2023]
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Biesuz R, Emma G, Milanese C, Dacarro G, Taglietti A, Nurchi VM, Alberti G. Novel DFO-SAM on mesoporous silica for iron sensing. Part I. Synthesis optimization and characterization of the material. Analyst 2015; 139:3932-9. [PMID: 24964923 DOI: 10.1039/c4an00179f] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [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
The synthesis and the physico-chemical characterisation of a novel solid phase, designed for iron(iii) sorption, are presented. The solid (indicated in the following as DFO-SAMMS) is made with a hydroxamate siderophore, the deferoxamine (DFO), covalently bound on a self-assembled monolayer on mesoporous silica (SAMMS). The data demonstrate that the DFO molecules are bound to the solid material, grafted on the surface and do not enter the silica pores. A new one-pot synthesis is presented in which DFO is dissolved in DMSO, and left to react with GPTMS with stirring overnight. In the same mixture, SAMMS is added to get the final product. The optimisation of experimental conditions of this novel one-pot synthesis is presented, with results indicating that a temperature of 90 °C, for the reaction between DFO and GPTMS, and the use of MCM-41 silica are the most convenient conditions. The kinetics of sorption reveals that the iron uptake is relatively fast, around 100 min at pH = 2.5, and from the sorption profile of iron(iii), the estimated capacity of the product obtained under optimized conditions was higher than 0.3 mmol g(-1). The results found in the present research are very promising for application in real biological samples.
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Affiliation(s)
- Raffaela Biesuz
- Dipartimento di Chimica, Università di Pavia, via Taramelli 12, 27100 Pavia, Italy.
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38
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Borzenkov M, Chirico G, D'Alfonso L, Sironi L, Collini M, Cabrini E, Dacarro G, Milanese C, Pallavicini P, Taglietti A, Bernhard C, Denat F. Thermal and Chemical Stability of Thiol Bonding on Gold Nanostars. Langmuir 2015; 31:8081-91. [PMID: 26154493 DOI: 10.1021/acs.langmuir.5b01473] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The stability of thiol bonding on the surface of star-shaped gold nanoparticles was studied as a function of temperature in water and in a set of biologically relevant conditions. The stability was evaluated by monitoring the release of a model fluorescent dye, Bodipy-thiol (BDP-SH), from gold nanostars (GNSs) cocoated with poly(ethylene glycol) thiol (PEG-SH). The increase in the BDP-SH fluorescence emission, quenched when bound to the GNSs, was exploited to this purpose. A maximum 15% dye release in aqueous solution was found when the bulk temperature of gold nanostars solutions was increased to T = 42 °C, the maximum physiological temperature. This fraction reduces 3-5% for temperatures lower than 40 °C. Similar results were found when the temperature increase was obtained by laser excitation of the near-infrared (NIR) localized surface plasmon resonance of the GNSs, which are photothermally responsive. Besides the direct impact of temperature, an increased BDP-SH release was observed upon changing the chemical composition of the solvent from pure water to phosphate-buffered saline and culture media solutions. Moreover, also a significant fraction of PEG-SH was released from the GNS surface due to the increase in temperature. We monitored it with a different approach, that is, by using a coating of α-mercapto-ω-amino PEG labeled with tetramethylrhodamine isothiocyanate on the amino group, that after heating was separated from GNS by ultracentrifugation and the released PEG was determined by spectrofluorimetric techniques on the supernatant solution. These results suggest some specific limitations in the use of the gold-thiolate bond for coating of nanomaterials with organic compounds in biological environments. These limitations come from the duration and the intensity of the thermal treatment and from the medium composition and could also be exploited in biological media to modulate the in vivo release of drugs.
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Affiliation(s)
- Mykola Borzenkov
- †Department of Physics "G. Occhialini", University of Milano Bicocca, piazza della Scienza 3, 20126 Milano, Italy
| | - Giuseppe Chirico
- †Department of Physics "G. Occhialini", University of Milano Bicocca, piazza della Scienza 3, 20126 Milano, Italy
| | - Laura D'Alfonso
- †Department of Physics "G. Occhialini", University of Milano Bicocca, piazza della Scienza 3, 20126 Milano, Italy
| | - Laura Sironi
- †Department of Physics "G. Occhialini", University of Milano Bicocca, piazza della Scienza 3, 20126 Milano, Italy
| | - Maddalena Collini
- †Department of Physics "G. Occhialini", University of Milano Bicocca, piazza della Scienza 3, 20126 Milano, Italy
| | - Elisa Cabrini
- ‡Department of Chemistry, University of Pavia, viale Taramelli 12, 27100 Pavia, Italy
| | - Giacomo Dacarro
- ‡Department of Chemistry, University of Pavia, viale Taramelli 12, 27100 Pavia, Italy
| | - Chiara Milanese
- ‡Department of Chemistry, University of Pavia, viale Taramelli 12, 27100 Pavia, Italy
| | | | - Angelo Taglietti
- ‡Department of Chemistry, University of Pavia, viale Taramelli 12, 27100 Pavia, Italy
| | - Claire Bernhard
- §Institut de Chimie Moléculaire de l'Université de Bourgogne, UMR CNRS 6302, Université de Bourgogne, 21078 Dijon, France
| | - Franck Denat
- §Institut de Chimie Moléculaire de l'Université de Bourgogne, UMR CNRS 6302, Université de Bourgogne, 21078 Dijon, France
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Pallavicini P, Dacarro G, Diaz-Fernandez YA, Taglietti A. Coordination chemistry of surface-grafted ligands for antibacterial materials. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.04.013] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Taglietti A, Arciola CR, D'Agostino A, Dacarro G, Montanaro L, Campoccia D, Cucca L, Vercellino M, Poggi A, Pallavicini P, Visai L. Antibiofilm activity of a monolayer of silver nanoparticles anchored to an amino-silanized glass surface. Biomaterials 2014; 35:1779-88. [DOI: 10.1016/j.biomaterials.2013.11.047] [Citation(s) in RCA: 141] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Accepted: 11/17/2013] [Indexed: 12/13/2022]
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41
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Pallavicini P, Donà A, Casu A, Chirico G, Collini M, Dacarro G, Falqui A, Milanese C, Sironi L, Taglietti A. Triton X-100 for three-plasmon gold nanostars with two photothermally active NIR (near IR) and SWIR (short-wavelength IR) channels. Chem Commun (Camb) 2014; 49:6265-7. [PMID: 23728398 DOI: 10.1039/c3cc42999g] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Five-branched gold nanostars are obtained using Triton X-100 in a seed-growth synthesis. They have the uncommon feature of two intense localized surface plasmon resonances (LSPRs) in the 600-900 and 1100-1600 nm ranges. Both LSPRs convert laser radiation into heat, offering two photothermally active channels in the NIR and SWIR ranges.
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42
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Pallavicini P, Donà A, Taglietti A, Minzioni P, Patrini M, Dacarro G, Chirico G, Sironi L, Bloise N, Visai L, Scarabelli L. Self-assembled monolayers of gold nanostars: a convenient tool for near-IR photothermal biofilm eradication. Chem Commun (Camb) 2014; 50:1969-71. [DOI: 10.1039/c3cc48667b] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Self-assembled monolayers of gold nanostars exert efficient photothermal action againstS. aureusbiofilms upon laser irradiation in the nearIR.
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Affiliation(s)
| | - Alice Donà
- inLAB
- Department of Chemistry
- University of Pavia
- 27100 Pavia, Italy
| | - Angelo Taglietti
- inLAB
- Department of Chemistry
- University of Pavia
- 27100 Pavia, Italy
| | - Paolo Minzioni
- Department of Electrical, Computer, and Biomedical Engineering, and CNISM
- University of Pavia
- 27100 Pavia, Italy
| | | | | | - Giuseppe Chirico
- Department of Physics “G. Occhialini”
- University of Milano Bicocca
- 20126 Milano, Italy
| | - Laura Sironi
- Department of Physics “G. Occhialini”
- University of Milano Bicocca
- 20126 Milano, Italy
| | - Nora Bloise
- Department of Molecular Medicine
- Center for Tissue Engineering (C.I.T.)
- INSTM UdR of Pavia
- University of Pavia
- 27100 Pavia, Italy
| | - Livia Visai
- Department of Molecular Medicine
- Center for Tissue Engineering (C.I.T.)
- INSTM UdR of Pavia
- University of Pavia
- 27100 Pavia, Italy
| | - Leonardo Scarabelli
- CIC biomaGUNE
- Center for Cooperative Research in Biomaterials
- 20009 Donostia-San Sebastián, Spain
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Pallavicini P, Dacarro G, Grisoli P, Mangano C, Patrini M, Rigoni F, Sangaletti L, Taglietti A. Coordination chemistry for antibacterial materials: a monolayer of a Cu2+ 2,2′-bipyridine complex grafted on a glass surface. Dalton Trans 2013; 42:4552-60. [DOI: 10.1039/c2dt32607h] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Casu A, Cabrini E, Donà A, Falqui A, Diaz-Fernandez Y, Milanese C, Taglietti A, Pallavicini P. Controlled Synthesis of Gold Nanostars by Using a Zwitterionic Surfactant. Chemistry 2012; 18:9381-90. [DOI: 10.1002/chem.201201024] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2012] [Indexed: 11/10/2022]
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Taglietti A, Diaz Fernandez YA, Amato E, Cucca L, Dacarro G, Grisoli P, Necchi V, Pallavicini P, Pasotti L, Patrini M. Antibacterial activity of glutathione-coated silver nanoparticles against Gram positive and Gram negative bacteria. Langmuir 2012; 28:8140-8. [PMID: 22546237 DOI: 10.1021/la3003838] [Citation(s) in RCA: 187] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
In the present paper, we study the mechanism of antibacterial activity of glutathione (GSH) coated silver nanoparticles (Ag NPs) on model Gram negative and Gram positive bacterial strains. Interference in bacterial cell replication is observed for both cellular strains when exposed to GSH stabilized colloidal silver in solution, and microbicidal activity was studied when GSH coated Ag NPs are (i) dispersed in colloidal suspensions or (ii) grafted on thiol-functionalized glass surfaces. The obtained results confirm that the effect of dispersed GSH capped Ag NPs (GSH Ag NPs) on Escherichia coli is more intense because it can be associated with the penetration of the colloid into the cytoplasm, with the subsequent local interaction of silver with cell components causing damages to the cells. Conversely, for Staphylococcus aureus, since the thick peptidoglycan layer of the cell wall prevents the penetration of the NPs inside the cytoplasm, the antimicrobial effect is limited and seems related to the interaction with the bacterial surfaces. Experiments on GSH Ag NPs grafted on glass allowed us to elucidate more precisely the antibacterial mechanism, showing that the action is reduced because of GSH coating and the limitation of the translational freedom of NPs.
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Affiliation(s)
- Angelo Taglietti
- Dipartimento di Chimica, Sezione di Chimica Generale, Università di Pavia, Pavia, Italy.
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Pallavicini P, Bernhard C, Dacarro G, Denat F, Diaz-Fernandez YA, Goze C, Pasotti L, Taglietti A. Optical method for predicting the composition of self-assembled monolayers of mixed thiols on surfaces coated with silver nanoparticles. Langmuir 2012; 28:3558-3568. [PMID: 22268522 DOI: 10.1021/la202995w] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
With a simple optical method, based on UV-vis absorption spectra on glass slides, it is possible to predict the composition of self-assembled monolayers of mixed thiols, grafted on monolayers of silver nanoparticles. Glass slides are modified with the layer-by-layer technique, first forming a monolayer of mercaptopropyltrimethoxysilane, then grafting a monolayer of silver nanoparticles on it. These surfaces are further coated by single or mixed thiol monolayers, by dipping the slides in toluene solutions of the chosen thiols. Exchange constants are calculated for the competitive deposition between the colorless 1-dodecanethiol or PEG5000 thiol and BDP-SH, with the latter being a thiol-bearing molecule containing the strongly absorbing BODIPY (4,4-difluoro-4-bora-3a,4a-diaza-s-indacene) moiety, synthesized on purpose. The constants are calculated by determining the fraction of BDP-SH deposited on the surface from a solution with a given molar fraction, directly measuring the absorption spectra of BDP-SH on the slides. Then, the exchange constant for the competitive deposition between 1-dodecanethiol and PEG5000 thiol is calculated by combining their exchange constants with BDP-SH. This allows to predict the fraction of the two colorless thiols coating the silver nanoparticles slides obtained from a toluene solution with a given molar fraction, for example, of PEG5000 thiol. The correctness of the calculated surface fraction is verified by studying the coating competition between 1-dodecanethiol and a PEG5000 thiol remotely modified with a strongly absorbing fluorescein fragment.
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Dacarro G, Cucca L, Grisoli P, Pallavicini P, Patrini M, Taglietti A. Monolayers of polyethilenimine on flat glass: a versatile platform for cations coordination and nanoparticles grafting in the preparation of antibacterial surfaces. Dalton Trans 2012; 41:2456-63. [DOI: 10.1039/c1dt11373a] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Affiliation(s)
- Nathalie Marcotte
- a Dipartimento di Chimica Generale , Università di Pavia , Viale Taramelli 12, 27100, Pavia, Italy
| | - Angelo Taglietti
- a Dipartimento di Chimica Generale , Università di Pavia , Viale Taramelli 12, 27100, Pavia, Italy
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Amato E, Diaz-Fernandez YA, Taglietti A, Pallavicini P, Pasotti L, Cucca L, Milanese C, Grisoli P, Dacarro C, Fernandez-Hechavarria JM, Necchi V. Synthesis, characterization and antibacterial activity against Gram positive and Gram negative bacteria of biomimetically coated silver nanoparticles. Langmuir 2011; 27:9165-9173. [PMID: 21736306 DOI: 10.1021/la201200r] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In the present work, we describe a simple procedure to produce biomimetically coated silver nanoparticles (Ag NPs), based on the postfunctionalization and purification of colloidal silver stabilized by citrate. Two biological capping agents have been used (cysteine Cys and glutathione GSH). The composition of the capped colloids has been ascertained by different techniques and antibacterial tests on GSH-capped Ag NPs have been conducted under physiological conditions, obtaining values of Minimum Inhibitory Concentration (MIC) of 180 and 15 μg/mL for Staphylococcus aureus and Escherichia coli, respectively. The antibacterial activity of these GSH capped NPs can be ascribed to the direct action of metallic silver NPs, rather than to the bulk release of Ag(+).
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Affiliation(s)
- Elvio Amato
- Dipartimento di Chimica, Sezione di Chimica Generale, Università di Pavia, viale Taramelli, 12-27100 Pavia, Italy
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Dacarro G, Ricci P, Sacchi D, Taglietti A. An Anthracene Based Photoswitchable Dioxo‐Tetraaza Ligand Selective for Cu
II
and Capable of Photochemical p
K
a
Modulation. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201001050] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [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)
- Giacomo Dacarro
- Dipartimento di Chimica Generale, Università di Pavia, Viale Taramelli 12, 27100 Pavia, Italy, Fax: +39‐0382‐529‐544
| | - Paola Ricci
- Dipartimento di Chimica Generale, Università di Pavia, Viale Taramelli 12, 27100 Pavia, Italy, Fax: +39‐0382‐529‐544
| | - Donatella Sacchi
- Dipartimento di Chimica Generale, Università di Pavia, Viale Taramelli 12, 27100 Pavia, Italy, Fax: +39‐0382‐529‐544
| | - Angelo Taglietti
- Dipartimento di Chimica Generale, Università di Pavia, Viale Taramelli 12, 27100 Pavia, Italy, Fax: +39‐0382‐529‐544
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