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Britel A, Tomagra G, Aprà P, Varzi V, Sturari S, Amine NH, Olivero P, Picollo F. 3D printing in microfluidics: experimental optimization of droplet size and generation time through flow focusing, phase, and geometry variation. RSC Adv 2024; 14:7770-7778. [PMID: 38444974 PMCID: PMC10913413 DOI: 10.1039/d4ra00752b] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 02/26/2024] [Indexed: 03/07/2024] Open
Abstract
Droplet-based microfluidics systems have become widely used in recent years thanks to their advantages, varying from the possibility of handling small fluid volumes to directly synthesizing and encapsulating various living forms for biological-related applications. The effectiveness of such systems mainly depends on the ability to control some of these systems' parameters, such as produced droplet size and formation time, which represents a challenging task. This work reports an experimental study on tuning droplet size and generation time in a flow-focusing geometry fabricated with stereolithography 3D printing by exploring the interplay of phase and geometrical parameters. We produced droplets at different low flow rates of continuous and dispersed phases to assess the effect of each of these phases on the droplets' size and formation time. We observed that smaller droplets were produced for high viscosity oil and water phase, along with high flow rates. In addition, changing the microfluidics channels' width, and morphology of the orifice has shown a similar effect on droplet size, as shown in the case of high-viscosity solutions. The variation of the bifurcation angle shows a noticeable variation in terms of the achieved droplet size and formation time. We further investigated the impact of modifying the width ratio of the continuous and dispersed phases on droplet formation.
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Affiliation(s)
- Adam Britel
- Department of Physics, "NIS" Inter-departmental Centre, University of Torino, National Institute of Nuclear Physics Sect. Torino, Via Pietro Giuria 1 10125 Torino Italy
| | - Giulia Tomagra
- Department of Drug and Science Technology, NIS Interdepartmental Centre, University of Torino Corso Raffaello 30 10125 Torino Italy
| | - Pietro Aprà
- Department of Physics, "NIS" Inter-departmental Centre, University of Torino, National Institute of Nuclear Physics Sect. Torino, Via Pietro Giuria 1 10125 Torino Italy
| | - Veronica Varzi
- Department of Physics, "NIS" Inter-departmental Centre, University of Torino, National Institute of Nuclear Physics Sect. Torino, Via Pietro Giuria 1 10125 Torino Italy
| | - Sofia Sturari
- Department of Physics, "NIS" Inter-departmental Centre, University of Torino, National Institute of Nuclear Physics Sect. Torino, Via Pietro Giuria 1 10125 Torino Italy
| | - Nour-Hanne Amine
- Department of Physics, "NIS" Inter-departmental Centre, University of Torino, National Institute of Nuclear Physics Sect. Torino, Via Pietro Giuria 1 10125 Torino Italy
| | - Paolo Olivero
- Department of Physics, "NIS" Inter-departmental Centre, University of Torino, National Institute of Nuclear Physics Sect. Torino, Via Pietro Giuria 1 10125 Torino Italy
| | - Federico Picollo
- Department of Physics, "NIS" Inter-departmental Centre, University of Torino, National Institute of Nuclear Physics Sect. Torino, Via Pietro Giuria 1 10125 Torino Italy
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Tomagra G, Re A, Varzi V, Aprà P, Britel A, Franchino C, Sturari S, Amine NH, Westerink RHS, Carabelli V, Picollo F. Enhancing the Study of Quantal Exocytotic Events: Combining Diamond Multi-Electrode Arrays with Amperometric PEak Analysis (APE) an Automated Analysis Code. Biosensors (Basel) 2023; 13:1033. [PMID: 38131793 PMCID: PMC10741388 DOI: 10.3390/bios13121033] [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] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 12/11/2023] [Accepted: 12/14/2023] [Indexed: 12/23/2023]
Abstract
MicroGraphited-Diamond-Multi Electrode Arrays (μG-D-MEAs) can be successfully used to reveal, in real time, quantal exocytotic events occurring from many individual neurosecretory cells and/or from many neurons within a network. As μG-D-MEAs arrays are patterned with up to 16 sensing microelectrodes, each of them recording large amounts of data revealing the exocytotic activity, the aim of this work was to support an adequate analysis code to speed up the signal detection. The cutting-edge technology of microGraphited-Diamond-Multi Electrode Arrays (μG-D-MEAs) has been implemented with an automated analysis code (APE, Amperometric Peak Analysis) developed using Matlab R2022a software to provide easy and accurate detection of amperometric spike parameters, including the analysis of the pre-spike foot that sometimes precedes the complete fusion pore dilatation. Data have been acquired from cultured PC12 cells, either collecting events during spontaneous exocytosis or after L-DOPA incubation. Validation of the APE code was performed by comparing the acquired spike parameters with those obtained using Quanta Analysis (Igor macro) by Mosharov et al.
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Affiliation(s)
- Giulia Tomagra
- Department of Drug and Science Technology, NIS Interdepartmental Centre, University of Torino, Corso Raffaello 30, 10125 Torino, Italy; (G.T.); (C.F.); (V.C.)
| | - Alice Re
- Department of Physics, NIS Interdepartmental Centre, University of Torino and Italian Institute of Nuclear Physics, Via Giuria 1, 10125 Torino, Italy (P.A.); (A.B.); (S.S.); (N.-H.A.); (F.P.)
| | - Veronica Varzi
- Department of Physics, NIS Interdepartmental Centre, University of Torino and Italian Institute of Nuclear Physics, Via Giuria 1, 10125 Torino, Italy (P.A.); (A.B.); (S.S.); (N.-H.A.); (F.P.)
| | - Pietro Aprà
- Department of Physics, NIS Interdepartmental Centre, University of Torino and Italian Institute of Nuclear Physics, Via Giuria 1, 10125 Torino, Italy (P.A.); (A.B.); (S.S.); (N.-H.A.); (F.P.)
| | - Adam Britel
- Department of Physics, NIS Interdepartmental Centre, University of Torino and Italian Institute of Nuclear Physics, Via Giuria 1, 10125 Torino, Italy (P.A.); (A.B.); (S.S.); (N.-H.A.); (F.P.)
| | - Claudio Franchino
- Department of Drug and Science Technology, NIS Interdepartmental Centre, University of Torino, Corso Raffaello 30, 10125 Torino, Italy; (G.T.); (C.F.); (V.C.)
| | - Sofia Sturari
- Department of Physics, NIS Interdepartmental Centre, University of Torino and Italian Institute of Nuclear Physics, Via Giuria 1, 10125 Torino, Italy (P.A.); (A.B.); (S.S.); (N.-H.A.); (F.P.)
| | - Nour-Hanne Amine
- Department of Physics, NIS Interdepartmental Centre, University of Torino and Italian Institute of Nuclear Physics, Via Giuria 1, 10125 Torino, Italy (P.A.); (A.B.); (S.S.); (N.-H.A.); (F.P.)
| | - Remco H. S. Westerink
- Neurotoxicology Research Group, Division of Toxicology, Institute for Risk Assessment Sciences (IRAS), Faculty of Veterinary Medicine, Utrecht University, P.O. Box 80.177, NL-3508 TD Utrecht, The Netherlands;
| | - Valentina Carabelli
- Department of Drug and Science Technology, NIS Interdepartmental Centre, University of Torino, Corso Raffaello 30, 10125 Torino, Italy; (G.T.); (C.F.); (V.C.)
| | - Federico Picollo
- Department of Physics, NIS Interdepartmental Centre, University of Torino and Italian Institute of Nuclear Physics, Via Giuria 1, 10125 Torino, Italy (P.A.); (A.B.); (S.S.); (N.-H.A.); (F.P.)
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3
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Varzi V, Fratini E, Falconieri M, Giovannini D, Cemmi A, Scifo J, Di Sarcina I, Aprà P, Sturari S, Mino L, Tomagra G, Infusino E, Landoni V, Marino C, Mancuso M, Picollo F, Pazzaglia S. Nanodiamond Effects on Cancer Cell Radiosensitivity: The Interplay between Their Chemical/Physical Characteristics and the Irradiation Energy. Int J Mol Sci 2023; 24:16622. [PMID: 38068942 PMCID: PMC10706717 DOI: 10.3390/ijms242316622] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 11/06/2023] [Accepted: 11/15/2023] [Indexed: 12/18/2023] Open
Abstract
Nanoparticles are being increasingly studied to enhance radiation effects. Among them, nanodiamonds (NDs) are taken into great consideration due to their low toxicity, inertness, chemical stability, and the possibility of surface functionalization. The objective of this study is to explore the influence of the chemical/physical properties of NDs on cellular radiosensitivity to combined treatments with radiation beams of different energies. DAOY, a human radioresistant medulloblastoma cell line was treated with NDs-differing for surface modifications [hydrogenated (H-NDs) and oxidized (OX-NDs)], size, and concentration-and analysed for (i) ND internalization and intracellular localization, (ii) clonogenic survival after combined treatment with different radiation beam energies and (iii) DNA damage and apoptosis, to explore the nature of ND-radiation biological interactions. Results show that chemical/physical characteristics of NDs are crucial in determining cell toxicity, with hydrogenated NDs (H-NDs) decreasing either cellular viability when administered alone, or cell survival when combined with radiation, depending on ND size and concentration, while OX-NDs do not. Also, irradiation at high energy (γ-rays at 1.25 MeV), in combination with H-NDs, is more efficient in eliciting radiosensitisation when compared to irradiation at lower energy (X-rays at 250 kVp). Finally, the molecular mechanisms of ND radiosensitisation was addressed, demonstrating that cell killing is mediated by the induction of Caspase-3-dependent apoptosis that is independent to DNA damage. Identifying the optimal combination of ND characteristics and radiation energy has the potential to offer a promising therapeutic strategy for tackling radioresistant cancers using H-NDs in conjunction with high-energy radiation.
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Affiliation(s)
- Veronica Varzi
- Physics Department, National Institute of Nuclear Physics, Section of Turin, University of Turin, Via P. Giuria 1, 10125 Turin, Italy; (V.V.); (P.A.); (S.S.)
- Laboratory of Biomedical Technologies, Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Casaccia Research Centre, Via Anguillarese 301, 00123 Rome, Italy; (E.F.); (D.G.); (C.M.); (M.M.)
- Nanomaterials for Industry and Sustainability (NIS) Inter-Departmental Centre, University of Turin, Via Quarello 15/A, 10125 Turin, Italy;
| | - Emiliano Fratini
- Laboratory of Biomedical Technologies, Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Casaccia Research Centre, Via Anguillarese 301, 00123 Rome, Italy; (E.F.); (D.G.); (C.M.); (M.M.)
| | - Mauro Falconieri
- Fusion and Technology for Nuclear Safety and Security Department, Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Casaccia Research Centre, Via Anguillarese 301, 00123 Rome, Italy;
| | - Daniela Giovannini
- Laboratory of Biomedical Technologies, Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Casaccia Research Centre, Via Anguillarese 301, 00123 Rome, Italy; (E.F.); (D.G.); (C.M.); (M.M.)
| | - Alessia Cemmi
- Innovative Nuclear Systems Laboratory, Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Casaccia Research Centre, Via Anguillarese 301, 00123 Rome, Italy; (A.C.); (J.S.); (I.D.S.)
| | - Jessica Scifo
- Innovative Nuclear Systems Laboratory, Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Casaccia Research Centre, Via Anguillarese 301, 00123 Rome, Italy; (A.C.); (J.S.); (I.D.S.)
| | - Ilaria Di Sarcina
- Innovative Nuclear Systems Laboratory, Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Casaccia Research Centre, Via Anguillarese 301, 00123 Rome, Italy; (A.C.); (J.S.); (I.D.S.)
| | - Pietro Aprà
- Physics Department, National Institute of Nuclear Physics, Section of Turin, University of Turin, Via P. Giuria 1, 10125 Turin, Italy; (V.V.); (P.A.); (S.S.)
- Nanomaterials for Industry and Sustainability (NIS) Inter-Departmental Centre, University of Turin, Via Quarello 15/A, 10125 Turin, Italy;
| | - Sofia Sturari
- Physics Department, National Institute of Nuclear Physics, Section of Turin, University of Turin, Via P. Giuria 1, 10125 Turin, Italy; (V.V.); (P.A.); (S.S.)
- Nanomaterials for Industry and Sustainability (NIS) Inter-Departmental Centre, University of Turin, Via Quarello 15/A, 10125 Turin, Italy;
| | - Lorenzo Mino
- Nanomaterials for Industry and Sustainability (NIS) Inter-Departmental Centre, University of Turin, Via Quarello 15/A, 10125 Turin, Italy;
- Chemistry Department, University of Turin, Via P. Giuria 7, 10125 Turin, Italy
| | - Giulia Tomagra
- Drug Science and Technology Department, University of Turin, Corso Raffaello 30, 10125 Turin, Italy;
| | - Erminia Infusino
- Medical Physics Laboratory, IRCCS Istituto Nazionale Tumori Regina Elena, Via Elio Chianesi 53, 00144 Rome, Italy; (E.I.); (V.L.)
| | - Valeria Landoni
- Medical Physics Laboratory, IRCCS Istituto Nazionale Tumori Regina Elena, Via Elio Chianesi 53, 00144 Rome, Italy; (E.I.); (V.L.)
| | - Carmela Marino
- Laboratory of Biomedical Technologies, Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Casaccia Research Centre, Via Anguillarese 301, 00123 Rome, Italy; (E.F.); (D.G.); (C.M.); (M.M.)
| | - Mariateresa Mancuso
- Laboratory of Biomedical Technologies, Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Casaccia Research Centre, Via Anguillarese 301, 00123 Rome, Italy; (E.F.); (D.G.); (C.M.); (M.M.)
| | - Federico Picollo
- Physics Department, National Institute of Nuclear Physics, Section of Turin, University of Turin, Via P. Giuria 1, 10125 Turin, Italy; (V.V.); (P.A.); (S.S.)
- Nanomaterials for Industry and Sustainability (NIS) Inter-Departmental Centre, University of Turin, Via Quarello 15/A, 10125 Turin, Italy;
| | - Simonetta Pazzaglia
- Laboratory of Biomedical Technologies, Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Casaccia Research Centre, Via Anguillarese 301, 00123 Rome, Italy; (E.F.); (D.G.); (C.M.); (M.M.)
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Petrini G, Tomagra G, Bernardi E, Moreva E, Traina P, Marcantoni A, Picollo F, Kvaková K, Cígler P, PietroDegiovanni I, Carabelli V, Genovese M. Nanodiamond-Quantum Sensors Reveal Temperature Variation Associated to Hippocampal Neurons Firing. Adv Sci (Weinh) 2023; 10:e2301101. [PMID: 37058686 PMCID: PMC10104661 DOI: 10.1002/advs.202301101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
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Tomagra G, Franchino C, Carbone E, Marcantoni A, Pasquarelli A, Picollo F, Carabelli V. Methodologies for Detecting Quantal Exocytosis in Adrenal Chromaffin Cells Through Diamond-Based MEAs. Methods Mol Biol 2023; 2565:213-221. [PMID: 36205897 DOI: 10.1007/978-1-0716-2671-9_15] [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: 06/16/2023]
Abstract
Diamond-based multiarray sensors are suitable to detect in real-time exocytosis and action potentials from cultured, spontaneously firing chromaffin cells, primary hippocampal neurons, and midbrain dopaminergic neurons. Here, we focus on how amperometric measurements of catecholamine release are performed on micrographitic diamond multiarrays (μG-D-MEAs) with high temporal and spatial resolution by 16 electrodes simultaneously.
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Affiliation(s)
- Giulia Tomagra
- Department of Drug Science and Technology and "NIS" Inter-departmental Centre, University of Torino, Turin, Italy.
| | - Claudio Franchino
- Department of Drug Science and Technology, University of Torino, Turin, Italy
| | - Emilio Carbone
- Department of Drug Science and Technology and "NIS" Inter-departmental Centre, University of Torino, Turin, Italy
| | - Andrea Marcantoni
- Department of Drug Science and Technology and "NIS" Inter-departmental Centre, University of Torino, Turin, Italy
| | | | - Federico Picollo
- Department of Physics and "NIS" Inter-departmental Centre, University of Torino, Istituto Nazionale di Fisica Nucleare - Sezione di Torino, Turin, Italy
| | - Valentina Carabelli
- Department of Drug Science and Technology and "NIS" Inter-departmental Centre, University of Torino, Turin, Italy
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Tomagra G, Peroni G, Aprà P, Bonino V, Campostrini M, Carabelli V, Ruvolo CC, Lo Giudice A, Guidorzi L, Mino L, Olivero P, Pacher L, Picariello F, Re A, Rigato V, Truccato M, Varzi V, Vittone E, Picollo F. Diamond-based sensors for in vitro cellular radiobiology: Simultaneous detection of cell exocytic activity and ionizing radiation. Biosens Bioelectron 2022; 220:114876. [DOI: 10.1016/j.bios.2022.114876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 10/20/2022] [Accepted: 10/31/2022] [Indexed: 11/06/2022]
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Petrini G, Tomagra G, Bernardi E, Moreva E, Traina P, Marcantoni A, Picollo F, Kvaková K, Cígler P, Degiovanni IP, Carabelli V, Genovese M. Nanodiamond-Quantum Sensors Reveal Temperature Variation Associated to Hippocampal Neurons Firing. Adv Sci (Weinh) 2022; 9:e2202014. [PMID: 35876403 PMCID: PMC9534962 DOI: 10.1002/advs.202202014] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 06/28/2022] [Indexed: 05/17/2023]
Abstract
Temperature is one of the most relevant parameters for the regulation of intracellular processes. Measuring localized subcellular temperature gradients is fundamental for a deeper understanding of cell function, such as the genesis of action potentials, and cell metabolism. Notwithstanding several proposed techniques, at the moment detection of temperature fluctuations at the subcellular level still represents an ongoing challenge. Here, for the first time, temperature variations (1 °C) associated with potentiation and inhibition of neuronal firing is detected, by exploiting a nanoscale thermometer based on optically detected magnetic resonance in nanodiamonds. The results demonstrate that nitrogen-vacancy centers in nanodiamonds provide a tool for assessing various levels of neuronal spiking activity, since they are suitable for monitoring different temperature variations, respectively, associated with the spontaneous firing of hippocampal neurons, the disinhibition of GABAergic transmission and the silencing of the network. Conjugated with the high sensitivity of this technique (in perspective sensitive to < 0.1 °C variations), nanodiamonds pave the way to a systematic study of the generation of localized temperature gradients under physiological and pathological conditions. Furthermore, they prompt further studies explaining in detail the physiological mechanism originating this effect.
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Affiliation(s)
- Giulia Petrini
- Istituto Nazionale di Ricerca MetrologicaStrada delle cacce 91Torino10135Italy
- Physics Department, University of Torinovia P. Giuria 1Torino10125Italy
- Department of Drug and Science Technology, University of TorinoCorso Raffaello 30Torino10125Italy
| | - Giulia Tomagra
- Department of Drug and Science Technology, University of TorinoCorso Raffaello 30Torino10125Italy
- NIS Inter‐departmental Centrevia G. Quarello 15Torino10135Italy
| | - Ettore Bernardi
- Istituto Nazionale di Ricerca MetrologicaStrada delle cacce 91Torino10135Italy
| | - Ekaterina Moreva
- Istituto Nazionale di Ricerca MetrologicaStrada delle cacce 91Torino10135Italy
| | - Paolo Traina
- Istituto Nazionale di Ricerca MetrologicaStrada delle cacce 91Torino10135Italy
| | - Andrea Marcantoni
- Department of Drug and Science Technology, University of TorinoCorso Raffaello 30Torino10125Italy
- NIS Inter‐departmental Centrevia G. Quarello 15Torino10135Italy
| | - Federico Picollo
- Physics Department, University of Torinovia P. Giuria 1Torino10125Italy
- Istituto Nazionale di Fisica Nucleare (INFN) Sez. Torinovia P. Giuria 1Torino10125Italy
| | - Klaudia Kvaková
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of SciencesFlemingovo nam. 2Prague 6166 10Czechia
- Institute of Medical Biochemistry and Laboratory DiagnosticsFirst Faculty of MedicineCharles University
Katerinska 1660/32Prague 2121 08Czechia
| | - Petr Cígler
- Institute of Medical Biochemistry and Laboratory DiagnosticsFirst Faculty of MedicineCharles University
Katerinska 1660/32Prague 2121 08Czechia
| | - Ivo Pietro Degiovanni
- Istituto Nazionale di Ricerca MetrologicaStrada delle cacce 91Torino10135Italy
- Istituto Nazionale di Fisica Nucleare (INFN) Sez. Torinovia P. Giuria 1Torino10125Italy
| | - Valentina Carabelli
- Department of Drug and Science Technology, University of TorinoCorso Raffaello 30Torino10125Italy
- NIS Inter‐departmental Centrevia G. Quarello 15Torino10135Italy
| | - Marco Genovese
- Istituto Nazionale di Ricerca MetrologicaStrada delle cacce 91Torino10135Italy
- Istituto Nazionale di Fisica Nucleare (INFN) Sez. Torinovia P. Giuria 1Torino10125Italy
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Aprà P, Mino L, Battiato A, Olivero P, Sturari S, Valsania MC, Varzi V, Picollo F. Interaction of Nanodiamonds with Water: Impact of Surface Chemistry on Hydrophilicity, Aggregation and Electrical Properties. Nanomaterials (Basel) 2021; 11:nano11102740. [PMID: 34685181 PMCID: PMC8538990 DOI: 10.3390/nano11102740] [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] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Revised: 10/12/2021] [Accepted: 10/13/2021] [Indexed: 11/30/2022]
Abstract
In recent decades, nanodiamonds (NDs) have earned increasing interest in a wide variety of research fields, thanks to their excellent mechanical, chemical, and optical properties, together with the possibility of easily tuning their surface chemistry for the desired purpose. According to the application context, it is essential to acquire an extensive understanding of their interaction with water in terms of hydrophilicity, environmental adsorption, stability in solution, and impact on electrical properties. In this paper, we report on a systematic study of the effects of reducing and oxidizing thermal processes on ND surface water adsorption. Both detonation and milled NDs were analyzed by combining different techniques. Temperature-dependent infrared spectroscopy was employed to study ND surface chemistry and water adsorption, while dynamic light scattering allowed the evaluation of their behavior in solution. The influence of water adsorption on their electrical properties was also investigated and correlated with structural and optical information obtained via Raman/photoluminescence spectroscopy. In general, higher oxygen-containing surfaces exhibited higher hydrophilicity, better stability in solution, and higher electrical conduction, although for the latter the surface graphitic contribution was also crucial. Our results provide in-depth information on the hydrophilicity of NDs in relation to their surface chemical and physical properties, by also evaluating the impacts on their aggregation and electrical conductance.
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Affiliation(s)
- Pietro Aprà
- Physics Department, University of Torino, Via Pietro Giuria 1, 10125 Torino, Italy; (P.A.); (P.O.); (S.S.); (V.V.); (F.P.)
- “Nanostructured Interfaces and Surfaces” (NIS) Inter-Departmental Centre, University of Torino, Via Quarello 15/a, 10135 Torino, Italy;
- National Institute of Nuclear Physics, Section of Torino, Via Pietro Giuria 1, 10125 Torino, Italy;
| | - Lorenzo Mino
- “Nanostructured Interfaces and Surfaces” (NIS) Inter-Departmental Centre, University of Torino, Via Quarello 15/a, 10135 Torino, Italy;
- Department of Chemistry, University of Torino, Via Pietro Giuria 7, 10125 Torino, Italy
- Correspondence:
| | - Alfio Battiato
- National Institute of Nuclear Physics, Section of Torino, Via Pietro Giuria 1, 10125 Torino, Italy;
| | - Paolo Olivero
- Physics Department, University of Torino, Via Pietro Giuria 1, 10125 Torino, Italy; (P.A.); (P.O.); (S.S.); (V.V.); (F.P.)
- “Nanostructured Interfaces and Surfaces” (NIS) Inter-Departmental Centre, University of Torino, Via Quarello 15/a, 10135 Torino, Italy;
- National Institute of Nuclear Physics, Section of Torino, Via Pietro Giuria 1, 10125 Torino, Italy;
| | - Sofia Sturari
- Physics Department, University of Torino, Via Pietro Giuria 1, 10125 Torino, Italy; (P.A.); (P.O.); (S.S.); (V.V.); (F.P.)
| | - Maria Carmen Valsania
- “Nanostructured Interfaces and Surfaces” (NIS) Inter-Departmental Centre, University of Torino, Via Quarello 15/a, 10135 Torino, Italy;
| | - Veronica Varzi
- Physics Department, University of Torino, Via Pietro Giuria 1, 10125 Torino, Italy; (P.A.); (P.O.); (S.S.); (V.V.); (F.P.)
- “Nanostructured Interfaces and Surfaces” (NIS) Inter-Departmental Centre, University of Torino, Via Quarello 15/a, 10135 Torino, Italy;
- National Institute of Nuclear Physics, Section of Torino, Via Pietro Giuria 1, 10125 Torino, Italy;
| | - Federico Picollo
- Physics Department, University of Torino, Via Pietro Giuria 1, 10125 Torino, Italy; (P.A.); (P.O.); (S.S.); (V.V.); (F.P.)
- “Nanostructured Interfaces and Surfaces” (NIS) Inter-Departmental Centre, University of Torino, Via Quarello 15/a, 10135 Torino, Italy;
- National Institute of Nuclear Physics, Section of Torino, Via Pietro Giuria 1, 10125 Torino, Italy;
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9
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Gorrini F, Dorigoni C, Olivares-Postigo D, Giri R, Aprà P, Picollo F, Bifone A. Long-Lived Ensembles of Shallow NV - Centers in Flat and Nanostructured Diamonds by Photoconversion. ACS Appl Mater Interfaces 2021; 13:43221-43232. [PMID: 34468122 PMCID: PMC8447188 DOI: 10.1021/acsami.1c09825] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 08/02/2021] [Indexed: 05/29/2023]
Abstract
Shallow, negatively charged nitrogen-vacancy centers (NV-) in diamond have been proposed for high-sensitivity magnetometry and spin-polarization transfer applications. However, surface effects tend to favor and stabilize the less useful neutral form, the NV0 centers. Here, we report the effects of green laser irradiation on ensembles of nanometer-shallow NV centers in flat and nanostructured diamond surfaces as a function of laser power in a range not previously explored (up to 150 mW/μm2). Fluorescence spectroscopy, optically detected magnetic resonance (ODMR), and charge-photoconversion detection are applied to characterize the properties and dynamics of NV- and NV0 centers. We demonstrate that high laser power strongly promotes photoconversion of NV0 to NV- centers. Surprisingly, the excess NV- population is stable over a timescale of 100 ms after switching off the laser, resulting in long-lived enrichment of shallow NV-. The beneficial effect of photoconversion is less marked in nanostructured samples. Our results are important to inform the design of samples and experimental procedures for applications relying on ensembles of shallow NV- centers in diamond.
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Affiliation(s)
- Federico Gorrini
- Istituto
Italiano di Tecnologia, Center for Sustainable
Future Technologies, via Livorno 60, 10144 Torino, Italy
- Molecular
Biology Center, University of Torino, via Nizza 52, 10126 Torino, Italy
| | - Carla Dorigoni
- Istituto
Italiano di Tecnologia, Center for Neuroscience
and Cognitive System, corso Bettini 31, 38068 Rovereto (Tn), Italy
| | - Domingo Olivares-Postigo
- Molecular
Biology Center, University of Torino, via Nizza 52, 10126 Torino, Italy
- Istituto
Italiano di Tecnologia, Center for Neuroscience
and Cognitive System, corso Bettini 31, 38068 Rovereto (Tn), Italy
- Department
of Molecular Biotechnology and Health Sciences, University of Torino, via Nizza 52, 10126 Torino, Italy
| | - Rakshyakar Giri
- Istituto
Italiano di Tecnologia, Center for Neuroscience
and Cognitive System, corso Bettini 31, 38068 Rovereto (Tn), Italy
| | - Pietro Aprà
- Department
of Physics and “NIS Inter-departmental Centre”, University of Torino, Via Pietro Giuria, 1, 10125 Torino, Italy
- National
Institute of Nuclear Physics, Section of Torino, Torino 10125, Italy
| | - Federico Picollo
- Department
of Physics and “NIS Inter-departmental Centre”, University of Torino, Via Pietro Giuria, 1, 10125 Torino, Italy
- National
Institute of Nuclear Physics, Section of Torino, Torino 10125, Italy
| | - Angelo Bifone
- Istituto
Italiano di Tecnologia, Center for Sustainable
Future Technologies, via Livorno 60, 10144 Torino, Italy
- Molecular
Biology Center, University of Torino, via Nizza 52, 10126 Torino, Italy
- Department
of Molecular Biotechnology and Health Sciences, University of Torino, via Nizza 52, 10126 Torino, Italy
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10
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Picollo F, Battiato A, Bosia F, Scaffidi Muta F, Olivero P, Rigato V, Rubanov S. Creation of pure non-crystalline diamond nanostructures via room-temperature ion irradiation and subsequent thermal annealing. Nanoscale Adv 2021; 3:4156-4165. [PMID: 36132848 PMCID: PMC9419479 DOI: 10.1039/d1na00136a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 06/08/2021] [Indexed: 06/16/2023]
Abstract
Carbon exhibits a remarkable range of structural forms, due to the availability of sp3, sp2 and sp1 chemical bonds. Contrarily to other group IV elements such as silicon and germanium, the formation of an amorphous phase based exclusively on sp3 bonds is extremely challenging due to the strongly favored formation of graphitic-like structures at room temperature and pressure. As such, the formation of a fully sp3-bonded carbon phase requires an extremely careful (and largely unexplored) definition of the pressure and temperature across the phase diagram. Here, we report on the possibility of creating full-sp3 amorphous nanostructures within the bulk crystal of diamond with room-temperature ion-beam irradiation, followed by an annealing process that does not involve the application of any external mechanical pressure. As confirmed by numerical simulations, the (previously unreported) radiation-damage-induced formation of an amorphous sp2-free phase in diamond is determined by the buildup of extremely high internal stresses from the surrounding lattice, which (in the case of nanometer-scale regions) fully prevent the graphitization process. Besides the relevance of understanding the formation of exotic carbon phases, the use of focused/collimated ion beams discloses appealing perspectives for the direct fabrication of such nanostructures in complex three-dimensional geometries.
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Affiliation(s)
- F Picollo
- Physics Department and "NIS Inter-departmental Centre", University of Torino Torino 10125 Italy
- National Institute of Nuclear Physics, Section of Torino Torino 10125 Italy
| | - A Battiato
- National Institute of Nuclear Physics, Section of Torino Torino 10125 Italy
| | - F Bosia
- Physics Department and "NIS Inter-departmental Centre", University of Torino Torino 10125 Italy
- Applied Science and Technology Department, Politecnico di Torino Torino 10129 Italy
| | - F Scaffidi Muta
- Physics Department and "NIS Inter-departmental Centre", University of Torino Torino 10125 Italy
| | - P Olivero
- Physics Department and "NIS Inter-departmental Centre", University of Torino Torino 10125 Italy
- National Institute of Nuclear Physics, Section of Torino Torino 10125 Italy
| | - V Rigato
- National Institute of Nuclear Physics, National Laboratories of Legnaro Legnaro 35020 Italy
| | - S Rubanov
- Ian Holmes Imaging Centre, Bio21 Institute, University of Melbourne Victoria 3010 Australia
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11
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Ditalia Tchernij S, Lühmann T, Corte E, Sardi F, Picollo F, Traina P, Brajković M, Crnjac A, Pezzagna S, Pastuović Ž, Degiovanni IP, Moreva E, Aprà P, Olivero P, Siketić Z, Meijer J, Genovese M, Forneris J. Fluorine-based color centers in diamond. Sci Rep 2020; 10:21537. [PMID: 33298995 PMCID: PMC7726554 DOI: 10.1038/s41598-020-78436-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 07/31/2020] [Accepted: 11/05/2020] [Indexed: 11/22/2022] Open
Abstract
We report on the creation and characterization of the luminescence properties of high-purity diamond substrates upon F ion implantation and subsequent thermal annealing. Their room-temperature photoluminescence emission consists of a weak emission line at 558 nm and of intense bands in the 600–750 nm spectral range. Characterization at liquid He temperature reveals the presence of a structured set of lines in the 600–670 nm spectral range. We discuss the dependence of the emission properties of F-related optical centers on different experimental parameters such as the operating temperature and the excitation wavelength. The correlation of the emission intensity with F implantation fluence, and the exclusive observation of the afore-mentioned spectral features in F-implanted and annealed samples provides a strong indication that the observed emission features are related to a stable F-containing defective complex in the diamond lattice.
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Affiliation(s)
- S Ditalia Tchernij
- Physics Department, University of Torino, 10125, Turin, Italy.,Istituto Nazionale Di Fisica Nucleare (INFN), Sezione Di Torino, 10125, Turin, Italy.,Istituto Nazionale Di Ricerca Metrologica (INRiM), 10135, Turin, Italy
| | - T Lühmann
- Applied Quantum Systems, Felix-Bloch Institute for Solid-State Physics, Universität Leipzig, 04103, Leipzig, Germany
| | - E Corte
- Physics Department, University of Torino, 10125, Turin, Italy.,Istituto Nazionale Di Fisica Nucleare (INFN), Sezione Di Torino, 10125, Turin, Italy
| | - F Sardi
- Physics Department, University of Torino, 10125, Turin, Italy
| | - F Picollo
- Physics Department, University of Torino, 10125, Turin, Italy.,Istituto Nazionale Di Fisica Nucleare (INFN), Sezione Di Torino, 10125, Turin, Italy
| | - P Traina
- Istituto Nazionale Di Ricerca Metrologica (INRiM), 10135, Turin, Italy
| | - M Brajković
- Laboratory for Ion Beam Interactions, Ruđer Bošković Institute, 10000, Zagreb, Croatia
| | - A Crnjac
- Laboratory for Ion Beam Interactions, Ruđer Bošković Institute, 10000, Zagreb, Croatia
| | - S Pezzagna
- Applied Quantum Systems, Felix-Bloch Institute for Solid-State Physics, Universität Leipzig, 04103, Leipzig, Germany
| | - Ž Pastuović
- Centre for Accelerator Science, Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights, NSW, 2234, Australia
| | - I P Degiovanni
- Istituto Nazionale Di Fisica Nucleare (INFN), Sezione Di Torino, 10125, Turin, Italy.,Istituto Nazionale Di Ricerca Metrologica (INRiM), 10135, Turin, Italy
| | - E Moreva
- Istituto Nazionale Di Ricerca Metrologica (INRiM), 10135, Turin, Italy
| | - P Aprà
- Physics Department, University of Torino, 10125, Turin, Italy.,Istituto Nazionale Di Fisica Nucleare (INFN), Sezione Di Torino, 10125, Turin, Italy
| | - P Olivero
- Physics Department, University of Torino, 10125, Turin, Italy.,Istituto Nazionale Di Fisica Nucleare (INFN), Sezione Di Torino, 10125, Turin, Italy.,Istituto Nazionale Di Ricerca Metrologica (INRiM), 10135, Turin, Italy
| | - Z Siketić
- Laboratory for Ion Beam Interactions, Ruđer Bošković Institute, 10000, Zagreb, Croatia
| | - J Meijer
- Applied Quantum Systems, Felix-Bloch Institute for Solid-State Physics, Universität Leipzig, 04103, Leipzig, Germany
| | - M Genovese
- Istituto Nazionale Di Fisica Nucleare (INFN), Sezione Di Torino, 10125, Turin, Italy.,Istituto Nazionale Di Ricerca Metrologica (INRiM), 10135, Turin, Italy
| | - J Forneris
- Physics Department, University of Torino, 10125, Turin, Italy. .,Istituto Nazionale Di Fisica Nucleare (INFN), Sezione Di Torino, 10125, Turin, Italy. .,Istituto Nazionale Di Ricerca Metrologica (INRiM), 10135, Turin, Italy.
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12
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Kuhn B, Picollo F, Carabelli V, Rispoli G. Advanced real-time recordings of neuronal activity with tailored patch pipettes, diamond multi-electrode arrays and electrochromic voltage-sensitive dyes. Pflugers Arch 2020; 473:15-36. [PMID: 33047171 PMCID: PMC7782438 DOI: 10.1007/s00424-020-02472-4] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 09/29/2020] [Accepted: 10/02/2020] [Indexed: 12/03/2022]
Abstract
To understand the working principles of the nervous system is key to figure out its electrical activity and how this activity spreads along the neuronal network. It is therefore crucial to develop advanced techniques aimed to record in real time the electrical activity, from compartments of single neurons to populations of neurons, to understand how higher functions emerge from coordinated activity. To record from single neurons, a technique will be presented to fabricate patch pipettes able to seal on any membrane with a single glass type and whose shanks can be widened as desired. This dramatically reduces access resistance during whole-cell recording allowing fast intracellular and, if required, extracellular perfusion. To simultaneously record from many neurons, biocompatible probes will be described employing multi-electrodes made with novel technologies, based on diamond substrates. These probes also allow to synchronously record exocytosis and neuronal excitability and to stimulate neurons. Finally, to achieve even higher spatial resolution, it will be shown how voltage imaging, employing fast voltage-sensitive dyes and two-photon microscopy, is able to sample voltage oscillations in the brain spatially resolved and voltage changes in dendrites of single neurons at millisecond and micrometre resolution in awake animals.
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Affiliation(s)
- Bernd Kuhn
- Optical Neuroimaging Unit, OIST Graduate University, 1919-1 Tancha, Onna-son, Okinawa, Japan
| | - Federico Picollo
- Department of Physics, NIS Interdepartmental Centre, University of Torino and Italian Institute of Nuclear Physics, via Giuria 1, 10125, Torino, Italy
| | - Valentina Carabelli
- Department of Drug and Science Technology, NIS Interdepartmental Centre, University of Torino, Corso Raffaello 30, 10125, Torino, Italy
| | - Giorgio Rispoli
- Department of Biomedical and Specialist Surgical Sciences, University of Ferrara, Via Luigi Borsari 46, 44121, Ferrara, Italy.
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13
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Picollo F, Tomagra G, Bonino V, Carabelli V, Mino L, Olivero P, Pasquarelli A, Truccato M. Triggering Neurotransmitters Secretion from Single Cells by X-ray Nanobeam Irradiation. Nano Lett 2020; 20:3889-3894. [PMID: 32227961 PMCID: PMC7997629 DOI: 10.1021/acs.nanolett.0c01046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The employment of ionizing radiation is a powerful tool in cancer therapy, but beyond targeted effects, many studies have highlighted the relevance of its off-target consequences. An exhaustive understanding of the mechanisms underlying these effects is still missing, and no real-time data about signals released by cells during irradiation are presently available. We employed a synchrotron X-ray nanobeam to perform the first real-time simultaneous measurement of both X-ray irradiation and in vitro neurotransmitter release from individual adrenal phaeochromocytoma (PC12) cells plated over a diamond-based multielectrode array. We have demonstrated that, in specific conditions, X-rays can alter cell activity by promoting dopamine exocytosis, and such an effect is potentially very attractive for a more effective treatment of tumors.
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Affiliation(s)
- Federico Picollo
- Department
of Physics, NIS Interdepartmental Centre, University of Torino and Italian Institute of Nuclear Physics, via Giuria 1, 10125 Torino, Italy
| | - Giulia Tomagra
- Department
of Drug and Science Technology, NIS Interdepartmental Centre, University of Torino, Corso Raffaello 30, 10125 Torino, Italy
| | - Valentina Bonino
- Department
of Physics, NIS Interdepartmental Centre, University of Torino and Italian Institute of Nuclear Physics, via Giuria 1, 10125 Torino, Italy
| | - Valentina Carabelli
- Department
of Drug and Science Technology, NIS Interdepartmental Centre, University of Torino, Corso Raffaello 30, 10125 Torino, Italy
| | - Lorenzo Mino
- Department
of Chemistry, NIS Interdepartmental Centre, University of Torino, via Giuria 7, 10125 Torino, Italy
| | - Paolo Olivero
- Department
of Physics, NIS Interdepartmental Centre, University of Torino and Italian Institute of Nuclear Physics, via Giuria 1, 10125 Torino, Italy
| | - Alberto Pasquarelli
- Institute
of Electron Devices and Circuits, University
of Ulm, 89069 Ulm, Germany
| | - Marco Truccato
- Department
of Physics, NIS Interdepartmental Centre, University of Torino and Italian Institute of Nuclear Physics, via Giuria 1, 10125 Torino, Italy
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14
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Tomagra G, Franchino C, Pasquarelli A, Carbone E, Olivero P, Carabelli V, Picollo F. Simultaneous multisite detection of quantal release from PC12 cells using micro graphitic-diamond multi electrode arrays. Biophys Chem 2019; 253:106241. [PMID: 31398633 DOI: 10.1016/j.bpc.2019.106241] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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: 06/29/2019] [Revised: 07/29/2019] [Accepted: 07/29/2019] [Indexed: 12/28/2022]
Abstract
Micro graphitic - diamond - multi electrode arrays (μG-D-MEAs) are suitable for measuring multisite quantal dopamine (DA) release from PC12 cells. Following cell stimulation with high extracellular KCl and electrode polarization at +650 mV, amperometric spikes are detected with a mean frequency of 0.60 ± 0.16 Hz. In each recording, simultaneous detection of secretory events is occurred in approximately 50% of the electrodes. Kinetic spike parameters and background noise are preserved among the different electrodes. Comparing the amperometric spikes recorder under control conditions with those recorders from PC12 cells previously incubated for 30 min with the dopamine precursor Levodopa (L-DOPA, 20 μM) it appears that the quantal size of amperometric spikes is increased by 250% and the half-time width (t1/2) by over 120%. On the contrary, L-DOPA has no effect on the frequency of secretory events. Overall, these data demonstrate that the μG-D-MEAs represent a reliable bio-sensor to simultaneously monitor quantal exocytotic events from different cells and in perspective can be exploited as a drug-screening tool.
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Affiliation(s)
- Giulia Tomagra
- Department of Drug and Science Technology, NIS Inter-departmental Centre, University of Torino, Corso Raffaello 30, 10125 Torino, Italy.
| | - Claudio Franchino
- Department of Drug and Science Technology, NIS Inter-departmental Centre, University of Torino, Corso Raffaello 30, 10125 Torino, Italy
| | - Alberto Pasquarelli
- Institute of Electron Devices and Circuits, University of Ulm, 89069 Ulm, Germany
| | - Emilio Carbone
- Department of Drug and Science Technology, NIS Inter-departmental Centre, University of Torino, Corso Raffaello 30, 10125 Torino, Italy
| | - Paolo Olivero
- Department of Physics, NIS Inter-departmental Centre, University of Torino, Italian Institute of Nuclear Physics, via Giuria 1, 10125 Torino, Italy
| | - Valentina Carabelli
- Department of Drug and Science Technology, NIS Inter-departmental Centre, University of Torino, Corso Raffaello 30, 10125 Torino, Italy
| | - Federico Picollo
- Department of Physics, NIS Inter-departmental Centre, University of Torino, Italian Institute of Nuclear Physics, via Giuria 1, 10125 Torino, Italy
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15
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Tomagra G, Picollo F, Battiato A, Picconi B, De Marchis S, Pasquarelli A, Olivero P, Marcantoni A, Calabresi P, Carbone E, Carabelli V. Quantal Release of Dopamine and Action Potential Firing Detected in Midbrain Neurons by Multifunctional Diamond-Based Microarrays. Front Neurosci 2019; 13:288. [PMID: 31024230 PMCID: PMC6465646 DOI: 10.3389/fnins.2019.00288] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 03/11/2019] [Indexed: 12/20/2022] Open
Abstract
Micro-Graphitic Single Crystal Diamond Multi Electrode Arrays (μG-SCD-MEAs) have so far been used as amperometric sensors to detect catecholamines from chromaffin cells and adrenal gland slices. Besides having time resolution and sensitivity that are comparable with carbon fiber electrodes, that represent the gold standard for amperometry, μG-SCD-MEAs also have the advantages of simultaneous multisite detection, high biocompatibility and implementation of amperometric/potentiometric protocols, aimed at monitoring exocytotic events and neuronal excitability. In order to adapt diamond technology to record neuronal activity, the μG-SCD-MEAs in this work have been interfaced with cultured midbrain neurons to detect electrical activity as well as quantal release of dopamine (DA). μG-SCD-MEAs are based on graphitic sensing electrodes that are embedded into the diamond matrix and are fabricated using MeV ion beam lithography. Two geometries have been adopted, with 4 × 4 and 8 × 8 microelectrodes (20 μm × 3.5 μm exposed area, 200 μm spacing). In the amperometric configuration, the 4 × 4 μG-SCD-MEAs resolved quantal exocytosis from midbrain dopaminergic neurons. KCl-stimulated DA release occurred as amperometric spikes of 15 pA amplitude and 0.5 ms half-width, at a mean frequency of 0.4 Hz. When used as potentiometric multiarrays, the 8 × 8 μG-SCD-MEAs detected the spontaneous firing activity of midbrain neurons. Extracellularly recorded action potentials (APs) had mean amplitude of ∼-50 μV and occurred at a mean firing frequency of 0.7 Hz in 67% of neurons, while the remaining fired at 6.8 Hz. Comparable findings were observed using conventional MEAs (0.9 and 6.4 Hz, respectively). To test the reliability of potentiometric recordings with μG-SCD-MEAs, the D2-autoreceptor modulation of firing was investigated by applying levodopa (L-DOPA, 20 μM), and comparing μG-SCD-MEAs, conventional MEAs and current-clamp recordings. In all cases, L-DOPA reduced the spontaneous spiking activity in most neurons by 70%, while the D2-antagonist sulpiride reversed this effect. Cell firing inhibition was generally associated with increased APs amplitude. A minority of neurons was either insensitive to, or potentiated by L-DOPA, suggesting that AP recordings originate from different midbrain neuronal subpopulations and reveal different modulatory pathways. Our data demonstrate, for the first time, that μG-SCD-MEAs are multi-functional biosensors suitable to resolve real-time DA release and AP firing in in vitro neuronal networks.
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Affiliation(s)
- Giulia Tomagra
- Department of Drug and Science Technology and "NIS" Inter-departmental Centre, University of Torino, Turin, Italy
| | - Federico Picollo
- Department of Physics and "NIS" Inter-departmental Centre, University of Torino, Turin, Italy.,Istituto Nazionale di Fisica Nucleare - Sezione di Torino, Turin, Italy
| | - Alfio Battiato
- Istituto Nazionale di Fisica Nucleare - Sezione di Torino, Turin, Italy
| | - Barbara Picconi
- Experimental Neurophysiology Laboratory, IRCCS San Raffaele Pisana, University San Raffaele, Rome, Italy.,University San Raffaele, Rome, Italy
| | - Silvia De Marchis
- Department of Life Sciences and Systems Biology and "NICO" Neuroscience Institute Cavalieri Ottolenghi, University of Torino, Turin, Italy
| | | | - Paolo Olivero
- Department of Physics and "NIS" Inter-departmental Centre, University of Torino, Turin, Italy.,Istituto Nazionale di Fisica Nucleare - Sezione di Torino, Turin, Italy
| | - Andrea Marcantoni
- Department of Drug and Science Technology and "NIS" Inter-departmental Centre, University of Torino, Turin, Italy
| | - Paolo Calabresi
- Neurological Clinic, Department of Medicine, Hospital Santa Maria della Misericordia, University of Perugia, Perugia, Italy
| | - Emilio Carbone
- Department of Drug and Science Technology and "NIS" Inter-departmental Centre, University of Torino, Turin, Italy
| | - Valentina Carabelli
- Department of Drug and Science Technology and "NIS" Inter-departmental Centre, University of Torino, Turin, Italy
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16
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Guarina L, Calorio C, Gavello D, Moreva E, Traina P, Battiato A, Ditalia Tchernij S, Forneris J, Gai M, Picollo F, Olivero P, Genovese M, Carbone E, Marcantoni A, Carabelli V. Nanodiamonds-induced effects on neuronal firing of mouse hippocampal microcircuits. Sci Rep 2018; 8:2221. [PMID: 29396456 PMCID: PMC5797106 DOI: 10.1038/s41598-018-20528-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [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: 10/05/2017] [Accepted: 01/11/2018] [Indexed: 01/31/2023] Open
Abstract
Fluorescent nanodiamonds (FND) are carbon-based nanomaterials that can efficiently incorporate optically active photoluminescent centers such as the nitrogen-vacancy complex, thus making them promising candidates as optical biolabels and drug-delivery agents. FNDs exhibit bright fluorescence without photobleaching combined with high uptake rate and low cytotoxicity. Focusing on FNDs interference with neuronal function, here we examined their effect on cultured hippocampal neurons, monitoring the whole network development as well as the electrophysiological properties of single neurons. We observed that FNDs drastically decreased the frequency of inhibitory (from 1.81 Hz to 0.86 Hz) and excitatory (from 1.61 to 0.68 Hz) miniature postsynaptic currents, and consistently reduced action potential (AP) firing frequency (by 36%), as measured by microelectrode arrays. On the contrary, bursts synchronization was preserved, as well as the amplitude of spontaneous inhibitory and excitatory events. Current-clamp recordings revealed that the ratio of neurons responding with AP trains of high-frequency (fast-spiking) versus neurons responding with trains of low-frequency (slow-spiking) was unaltered, suggesting that FNDs exerted a comparable action on neuronal subpopulations. At the single cell level, rapid onset of the somatic AP (“kink”) was drastically reduced in FND-treated neurons, suggesting a reduced contribution of axonal and dendritic components while preserving neuronal excitability.
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Affiliation(s)
- L Guarina
- Department of Drug Science and Technology, "NIS" inter-departmental centre, University of Torino, Corso Raffaello 30, 10125, Torino, Italy
| | - C Calorio
- Department of Drug Science and Technology, "NIS" inter-departmental centre, University of Torino, Corso Raffaello 30, 10125, Torino, Italy
| | - D Gavello
- Department of Drug Science and Technology, "NIS" inter-departmental centre, University of Torino, Corso Raffaello 30, 10125, Torino, Italy
| | - E Moreva
- Istituto Nazionale Ricerca Metrologica, Strada delle Cacce 91, 10135, Torino, Italy
| | - P Traina
- Istituto Nazionale Ricerca Metrologica, Strada delle Cacce 91, 10135, Torino, Italy
| | - A Battiato
- Istituto Nazionale di Fisica Nucleare, sezione di Torino, Via P. Giuria 1, 10125, Torino, Italy
| | - S Ditalia Tchernij
- Department of Physics and "NIS" inter-departmental centre, University of Torino, Via P. Giuria 1, 10125, Torino, Italy.,Istituto Nazionale di Fisica Nucleare, sezione di Torino, Via P. Giuria 1, 10125, Torino, Italy
| | - J Forneris
- Istituto Nazionale di Fisica Nucleare, sezione di Torino, Via P. Giuria 1, 10125, Torino, Italy
| | - M Gai
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, 10126, Torino, Italy
| | - F Picollo
- Department of Physics and "NIS" inter-departmental centre, University of Torino, Via P. Giuria 1, 10125, Torino, Italy.,Istituto Nazionale di Fisica Nucleare, sezione di Torino, Via P. Giuria 1, 10125, Torino, Italy
| | - P Olivero
- Department of Physics and "NIS" inter-departmental centre, University of Torino, Via P. Giuria 1, 10125, Torino, Italy.,Istituto Nazionale di Fisica Nucleare, sezione di Torino, Via P. Giuria 1, 10125, Torino, Italy
| | - M Genovese
- Istituto Nazionale Ricerca Metrologica, Strada delle Cacce 91, 10135, Torino, Italy.,Istituto Nazionale di Fisica Nucleare, sezione di Torino, Via P. Giuria 1, 10125, Torino, Italy
| | - E Carbone
- Department of Drug Science and Technology, "NIS" inter-departmental centre, University of Torino, Corso Raffaello 30, 10125, Torino, Italy
| | - A Marcantoni
- Department of Drug Science and Technology, "NIS" inter-departmental centre, University of Torino, Corso Raffaello 30, 10125, Torino, Italy
| | - V Carabelli
- Department of Drug Science and Technology, "NIS" inter-departmental centre, University of Torino, Corso Raffaello 30, 10125, Torino, Italy.
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17
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Carabelli V, Marcantoni A, Picollo F, Battiato A, Bernardi E, Pasquarelli A, Olivero P, Carbone E. Planar Diamond-Based Multiarrays to Monitor Neurotransmitter Release and Action Potential Firing: New Perspectives in Cellular Neuroscience. ACS Chem Neurosci 2017; 8:252-264. [PMID: 28027435 DOI: 10.1021/acschemneuro.6b00328] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
High biocompatibility, outstanding electrochemical responsiveness, inertness, and transparency make diamond-based multiarrays (DBMs) first-rate biosensors for in vitro detection of electrochemical and electrical signals from excitable cells together, with potential for in vivo applications as neural interfaces and prostheses. Here, we will review the electrochemical and physical properties of various DBMs and how these devices have been employed for recording released neurotransmitter molecules and all-or-none action potentials from living cells. Specifically, we will overview how DBMs can resolve localized exocytotic events from subcellular compartments using high-density microelectrode arrays (MEAs), or monitoring oxidizable neurotransmitter release from populations of cells in culture and tissue slices using low-density MEAs. Interfacing DBMs with excitable cells is currently leading to the promising opportunity of recording electrical signals as well as creating neuronal interfaces through the same device. Given the recent increasingly growing development of newly available DBMs of various geometries to monitor electrical activity and neurotransmitter release in a variety of excitable and neuronal tissues, the discussion will be limited to planar DBMs.
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Affiliation(s)
- Valentina Carabelli
- Consorzio Nazionale Interuniversitario per le Scienze fisiche della Materia (CNISM), 10125 Torino Unit, Italy
| | - Andrea Marcantoni
- Consorzio Nazionale Interuniversitario per le Scienze fisiche della Materia (CNISM), 10125 Torino Unit, Italy
| | - Federico Picollo
- Consorzio Nazionale Interuniversitario per le Scienze fisiche della Materia (CNISM), 10125 Torino Unit, Italy
- Istituto Nazionale di Fisica Nucleare (INFN), 10125 sez. Torino, Italy
| | - Alfio Battiato
- Consorzio Nazionale Interuniversitario per le Scienze fisiche della Materia (CNISM), 10125 Torino Unit, Italy
- Istituto Nazionale di Fisica Nucleare (INFN), 10125 sez. Torino, Italy
| | - Ettore Bernardi
- Consorzio Nazionale Interuniversitario per le Scienze fisiche della Materia (CNISM), 10125 Torino Unit, Italy
- Istituto Nazionale di Fisica Nucleare (INFN), 10125 sez. Torino, Italy
| | - Alberto Pasquarelli
- Institute
of Electron Devices and Circuits, Ulm University, 89081 Ulm, Germany
| | - Paolo Olivero
- Consorzio Nazionale Interuniversitario per le Scienze fisiche della Materia (CNISM), 10125 Torino Unit, Italy
- Istituto Nazionale di Fisica Nucleare (INFN), 10125 sez. Torino, Italy
| | - Emilio Carbone
- Consorzio Nazionale Interuniversitario per le Scienze fisiche della Materia (CNISM), 10125 Torino Unit, Italy
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18
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Picollo F, Battiato A, Bernardi E, Marcantoni A, Pasquarelli A, Carbone E, Olivero P, Carabelli V. Microelectrode Arrays of Diamond-Insulated Graphitic Channels for Real-Time Detection of Exocytotic Events from Cultured Chromaffin Cells and Slices of Adrenal Glands. Anal Chem 2016; 88:7493-9. [DOI: 10.1021/acs.analchem.5b04449] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Federico Picollo
- Istituto Nazionale di Fisica Nucleare (INFN), 10125 Torino, Italy
- Physics
Department, University of Torino, 10125 Torino, Italy
- “Nanostructured
Interfaces and Surfaces” Inter-departmental Centre, University of Torino, 10125 Torino, Italy
- Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Torino Unit, 10125 Torino, Italy
| | - Alfio Battiato
- Istituto Nazionale di Fisica Nucleare (INFN), 10125 Torino, Italy
- Physics
Department, University of Torino, 10125 Torino, Italy
- “Nanostructured
Interfaces and Surfaces” Inter-departmental Centre, University of Torino, 10125 Torino, Italy
- Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Torino Unit, 10125 Torino, Italy
| | - Ettore Bernardi
- Istituto Nazionale di Fisica Nucleare (INFN), 10125 Torino, Italy
- Physics
Department, University of Torino, 10125 Torino, Italy
- “Nanostructured
Interfaces and Surfaces” Inter-departmental Centre, University of Torino, 10125 Torino, Italy
- Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Torino Unit, 10125 Torino, Italy
| | - Andrea Marcantoni
- “Nanostructured
Interfaces and Surfaces” Inter-departmental Centre, University of Torino, 10125 Torino, Italy
- Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Torino Unit, 10125 Torino, Italy
- Department
of Drug Science and Technology, University of Torino, 10125 Torino, Italy
| | - Alberto Pasquarelli
- Institute
of Electron Devices and Circuits, Ulm University, 89081 Ulm, Germany
| | - Emilio Carbone
- “Nanostructured
Interfaces and Surfaces” Inter-departmental Centre, University of Torino, 10125 Torino, Italy
- Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Torino Unit, 10125 Torino, Italy
- Department
of Drug Science and Technology, University of Torino, 10125 Torino, Italy
| | - Paolo Olivero
- Istituto Nazionale di Fisica Nucleare (INFN), 10125 Torino, Italy
- Physics
Department, University of Torino, 10125 Torino, Italy
- “Nanostructured
Interfaces and Surfaces” Inter-departmental Centre, University of Torino, 10125 Torino, Italy
- Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Torino Unit, 10125 Torino, Italy
| | - Valentina Carabelli
- “Nanostructured
Interfaces and Surfaces” Inter-departmental Centre, University of Torino, 10125 Torino, Italy
- Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Torino Unit, 10125 Torino, Italy
- Department
of Drug Science and Technology, University of Torino, 10125 Torino, Italy
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19
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Picollo F, Battiato A, Bernardi E, Plaitano M, Franchino C, Gosso S, Pasquarelli A, Carbone E, Olivero P, Carabelli V. All-carbon multi-electrode array for real-time in vitro measurements of oxidizable neurotransmitters. Sci Rep 2016; 6:20682. [PMID: 26857940 PMCID: PMC4746641 DOI: 10.1038/srep20682] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [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: 09/15/2015] [Accepted: 12/31/2015] [Indexed: 02/05/2023] Open
Abstract
We report on the ion beam fabrication of all-carbon multi electrode arrays (MEAs) based on 16 graphitic micro-channels embedded in single-crystal diamond (SCD) substrates. The fabricated SCD-MEAs are systematically employed for the in vitro simultaneous amperometric detection of the secretory activity from populations of chromaffin cells, demonstrating a new sensing approach with respect to standard techniques. The biochemical stability and biocompatibility of the SCD-based device combined with the parallel recording of multi-electrodes array allow: i) a significant time saving in data collection during drug screening and/or pharmacological tests over a large number of cells, ii) the possibility of comparing altered cell functionality among cell populations, and iii) the repeatition of acquisition runs over many cycles with a fully non-toxic and chemically robust bio-sensitive substrate.
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Affiliation(s)
- Federico Picollo
- Istituto Nazionale di Fisica Nucleare (INFN) Sez. Torino; via P. Giuria 1, 10125, Torino, Italy.,Physics Department and "NIS" Inter-departmental Centre - University of Torino; via P. Giuria 1, 10125, Torino, Italy.,Consorzio Nazionale Inter-universitario per le Scienze fisiche della Materia (CNISM) Sez. Torino, Italy
| | - Alfio Battiato
- Istituto Nazionale di Fisica Nucleare (INFN) Sez. Torino; via P. Giuria 1, 10125, Torino, Italy.,Physics Department and "NIS" Inter-departmental Centre - University of Torino; via P. Giuria 1, 10125, Torino, Italy.,Consorzio Nazionale Inter-universitario per le Scienze fisiche della Materia (CNISM) Sez. Torino, Italy
| | - Ettore Bernardi
- Istituto Nazionale di Fisica Nucleare (INFN) Sez. Torino; via P. Giuria 1, 10125, Torino, Italy.,Physics Department and "NIS" Inter-departmental Centre - University of Torino; via P. Giuria 1, 10125, Torino, Italy.,Consorzio Nazionale Inter-universitario per le Scienze fisiche della Materia (CNISM) Sez. Torino, Italy
| | - Marilena Plaitano
- Physics Department and "NIS" Inter-departmental Centre - University of Torino; via P. Giuria 1, 10125, Torino, Italy
| | - Claudio Franchino
- Consorzio Nazionale Inter-universitario per le Scienze fisiche della Materia (CNISM) Sez. Torino, Italy.,Drug Science and Technology Department and "NIS" Inter-departmental Centre - University of Torino; Corso Raffaello 30, 10125, Torino, Italy
| | - Sara Gosso
- Consorzio Nazionale Inter-universitario per le Scienze fisiche della Materia (CNISM) Sez. Torino, Italy.,Drug Science and Technology Department and "NIS" Inter-departmental Centre - University of Torino; Corso Raffaello 30, 10125, Torino, Italy
| | - Alberto Pasquarelli
- Institute of Electron Devices and Circuits - University of Ulm - Ulm; Albert Einstein Allee 45, 89069, Germany
| | - Emilio Carbone
- Consorzio Nazionale Inter-universitario per le Scienze fisiche della Materia (CNISM) Sez. Torino, Italy.,Drug Science and Technology Department and "NIS" Inter-departmental Centre - University of Torino; Corso Raffaello 30, 10125, Torino, Italy
| | - Paolo Olivero
- Istituto Nazionale di Fisica Nucleare (INFN) Sez. Torino; via P. Giuria 1, 10125, Torino, Italy.,Physics Department and "NIS" Inter-departmental Centre - University of Torino; via P. Giuria 1, 10125, Torino, Italy.,Consorzio Nazionale Inter-universitario per le Scienze fisiche della Materia (CNISM) Sez. Torino, Italy
| | - Valentina Carabelli
- Consorzio Nazionale Inter-universitario per le Scienze fisiche della Materia (CNISM) Sez. Torino, Italy.,Drug Science and Technology Department and "NIS" Inter-departmental Centre - University of Torino; Corso Raffaello 30, 10125, Torino, Italy
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Bosia F, Argiolas N, Bazzan M, Fairchild BA, Greentree AD, Lau DWM, Olivero P, Picollo F, Rubanov S, Prawer S. Direct measurement and modelling of internal strains in ion-implanted diamond. J Phys Condens Matter 2013; 25:385403. [PMID: 23988841 DOI: 10.1088/0953-8984/25/38/385403] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We present a phenomenological model and finite element simulations to describe the depth variation of mass density and strain of ion-implanted single-crystal diamond. Several experiments are employed to validate the approach: firstly, samples implanted with 180 keV B ions at relatively low fluences are characterized using high-resolution x-ray diffraction; secondly, the mass density variation of a sample implanted with 500 keV He ions, well above its amorphization threshold, is characterized with electron energy loss spectroscopy. At high damage densities, the experimental depth profiles of strain and density display a saturation effect with increasing damage and a shift of the damage density peak towards greater depth values with respect to those predicted by TRIM simulations, which are well accounted for in the model presented here. The model is then further validated by comparing transmission electron microscopy-measured and simulated thickness values of a buried amorphous carbon layer formed at different depths by implantation of 500 keV He ions through a variable-thickness mask to simulate the simultaneous implantation of ions at different energies.
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Affiliation(s)
- F Bosia
- Department of Physics-NIS Centre of Excellence, Università di Torino, Italy.
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21
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Picollo F, Gosso S, Vittone E, Pasquarelli A, Carbone E, Olivero P, Carabelli V. A new diamond biosensor with integrated graphitic microchannels for detecting quantal exocytic events from chromaffin cells. Adv Mater 2013; 25:4696-700. [PMID: 23847004 DOI: 10.1002/adma.201300710] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Revised: 05/07/2013] [Indexed: 05/15/2023]
Abstract
An MeV ion-microbeam lithographic technique can be successfully employed for the fabrication of an all-carbon miniaturized cellular biosensor based on graphitic microchannels embedded in a single-crystal diamond matrix. The device is functionally characterized for the in vitro recording of quantal exocytic events from single chromaffin cells, with high sensitivity and signal-to-noise ratio, opening promising perspectives for the realization of monolithic all-carbon cellular biosensors.
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Affiliation(s)
- Federico Picollo
- Department of Physics, NIS Centre of Excellence, CNISM Research Unit - University of Torino, INFN Sez. Torino, via P. Giuria 1, Torino, 10125, Italy.
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