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Banchelli M, Cascella R, D'Andrea C, Cabaj L, Osticioli I, Ciofini D, Li MS, Skupień K, de Angelis M, Siano S, Cecchi C, Pini R, La Penna G, Chiti F, Matteini P. Nanoscopic insights into the surface conformation of neurotoxic amyloid β oligomers. RSC Adv 2020; 10:21907-21913. [PMID: 35516647 PMCID: PMC9054531 DOI: 10.1039/d0ra03799k] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [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: 04/27/2020] [Accepted: 06/01/2020] [Indexed: 11/21/2022] Open
Abstract
Raman spectroscopy assisted by localized plasmon resonances generating effective hot spots at the gaps between intertwined silver nanowires is herein adopted to unravel characteristic molecular motifs on the surface of Aβ42 misfolded oligomers that are critical in driving intermolecular interactions in neurodegeneration. Unraveling characteristic structural determinants at the basis of Aβ42 oligomers' neurotoxicity by a sub-molecular SERS investigation of their surface.![]()
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Cacciari I, Ciofini D, Baija H, Siano S. Terahertz Time-Domain Reconstruction of Coating Microstratigraphy on Gilded Surfaces. Materials (Basel) 2019; 12:E3822. [PMID: 31766348 PMCID: PMC6926600 DOI: 10.3390/ma12233822] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 10/30/2019] [Revised: 11/18/2019] [Accepted: 11/19/2019] [Indexed: 11/16/2022]
Abstract
Here, a systematic study in order to assess the potential of THz time domain reflectometry for measuring the thicknesses of overpaint layers applied on original gilded surfaces was carried out. The work is part of a thorough characterization campaign, which is going on at the Rijksmuseum for addressing the conservation problems of a set of 19th century gilded picture frames on which heavy coatings were applied in previous undocumented restoration interventions. To perform such non-invasive thickness measurements, an analytical protocol based on Gaussian fits of the THz pulse-echo temporal profiles was optimized through the preparation of suitable technical samples and the comparison with direct thickness measurements. Finally, the methodology was validated by characterizing the microstratigraphy of an original sculptural element from a gilded picture frame in the Rijksmuseum collection. The results achieved show the effectiveness of the present approach in revealing multi-layered dielectric microstructures with a spatial resolution of about 30 µm when using a spectral range up to 1.5 THz.
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Affiliation(s)
- Ilaria Cacciari
- Istituto di Fisica Applicata “Nello Carrara”, Consiglio Nazionale delle Ricerche, v. M. del Piano 10, 50019 Sesto Fiorentino (FI), Italy; (D.C.); (S.S.)
| | - Daniele Ciofini
- Istituto di Fisica Applicata “Nello Carrara”, Consiglio Nazionale delle Ricerche, v. M. del Piano 10, 50019 Sesto Fiorentino (FI), Italy; (D.C.); (S.S.)
| | - Hubert Baija
- Rijksmuseum Amsterdam, Museumstraat 1, Postbus 74888, 1070 DN Amsterdam, The Netherlands;
| | - Salvatore Siano
- Istituto di Fisica Applicata “Nello Carrara”, Consiglio Nazionale delle Ricerche, v. M. del Piano 10, 50019 Sesto Fiorentino (FI), Italy; (D.C.); (S.S.)
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Cavigli L, Centi S, Borri C, Tortoli P, Panettieri I, Streit I, Ciofini D, Magni G, Rossi F, Siano S, Ratto F, Pini R. 1064-nm-resonant gold nanorods for photoacoustic theranostics within permissible exposure limits. J Biophotonics 2019; 12:e201900082. [PMID: 31155855 DOI: 10.1002/jbio.201900082] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 03/05/2019] [Revised: 05/03/2019] [Accepted: 05/30/2019] [Indexed: 05/07/2023]
Abstract
Therapeutic and diagnostic methods based on photomechanical effects are attracting much current attention in contexts as oncology, cardiology and vascular surgery, for such applications as photoacoustic imaging or microsurgery. Their underlying mechanism is the generation of ultrasound or cavitation from the interaction of short optical pulses with endogenous dyes or targeted contrast agents. Among the latter, gold nanorods are outstanding candidates, but their use has mainly been reported for photoacoustic imaging and photothermal treatments. Conversely, much less is still known about their value as a precision tool for photomechanical manipulations, such as to impart local damage with high spatial resolution through the expansion and collapse of microbubbles. Here, we address the feasibility of gold nanorods exhibiting a distribution of surface plasmon resonances between about 900 to above 1100 nm as a contrast agent for photoacoustic theranostics. After testing their cytotoxicity and cellular uptake, we discuss their photostability and use to mediate cavitation and the photomechanical destruction of targeted cells. We find that the choice of a plasmonic band peaking around 1064 nm is key to enhance the translational potential of this approach. With respect to the standard alternative of 800 nm, at 1064 nm, relevant regulations on optical exposure are less restrictive and the photonic technology is more mature.
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Affiliation(s)
- Lucia Cavigli
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Sonia Centi
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Claudia Borri
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Paolo Tortoli
- Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, Sesto Fiorentino, Italy
| | - Ilaria Panettieri
- Dipartimento di Ingegneria Meccanica e Aerospaziale, Politecnico di Torino, Torino, Italy
| | | | - Daniele Ciofini
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Giada Magni
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Francesca Rossi
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Salvatore Siano
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Fulvio Ratto
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
| | - Roberto Pini
- Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche IFAC-CNR, Sesto Fiorentino, Italy
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Mencaglia AA, Osticioli I, Ciofini D, Gallo L, Siano S. Raman spectrometer for the automated scan of large painted surfaces. Rev Sci Instrum 2019; 90:053101. [PMID: 31153252 DOI: 10.1063/1.5088039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 04/14/2019] [Indexed: 06/09/2023]
Abstract
In this work, a novel Raman scanner capable of performing point-to-point mapping of relatively large surface of paintings is presented. This device employs an excitation wavelength of 1064 nm, and it is equipped with a high efficiency probe in order to collect the back-scattered light from each point of analysis. The use of long depth-of-field optics as well as an autofocus system allowed maintaining the best conditions for the Raman signal acquisition during the scanning, regardless of the surface irregularities. The small dimension of the optical components and the reasonable size of mechanical parts made this instrumentation particularly suitable for on-site measurements. Finally, the Raman scanner was also equipped with an online temperature control using a thermal sensor, which allows modulating automatically the output power of the laser source in order to prevent overheating and alteration effects during the scanning process. The capabilities of the Raman scanner were evaluated scanning two valuable paintings one attributed to Ambrogio Lorenzetti and the other to Duccio da Buoninsegna of the fourteenth century.
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Affiliation(s)
| | - Iacopo Osticioli
- Institute of Applied Physics "Nello Carrara" (IFAC-CNR), Florence, Italy
| | - Daniele Ciofini
- Institute of Applied Physics "Nello Carrara" (IFAC-CNR), Florence, Italy
| | | | - Salvatore Siano
- Institute of Applied Physics "Nello Carrara" (IFAC-CNR), Florence, Italy
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Ciofini D, Oujja M, Cañamares MV, Siano S, Castillejo M. Detecting molecular changes in UV laser-ablated oil/diterpenoid resin coatings using micro-Raman spectroscopy and Laser Induced Fluorescence. Microchem J 2018. [DOI: 10.1016/j.microc.2018.05.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Osticioli I, Ciofini D, Mencaglia AA, Siano S. Automated characterization of varnishes photo-degradation using portable T-controlled Raman spectroscopy. Spectrochim Acta A Mol Biomol Spectrosc 2017; 172:182-188. [PMID: 27017061 DOI: 10.1016/j.saa.2016.03.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 01/08/2016] [Accepted: 03/16/2016] [Indexed: 06/05/2023]
Abstract
In this work, a portable-Raman device (excitation wavelength 1064nm) was employed for the first time for continuously monitoring the complex molecular dynamics of terpenoid resins (dammar, mastic, colophony, sandarac and shellac), which occur during their ageing under artificial light exposure. The instrumentation was equipped with a pyroelectric sensor allowing for temperature control of the sample's irradiated surface while the acquisition of spectra occurs by setting fixed maximum temperature and total radiant exposure. Resins were dropped into special pits over a dedicated rotating wheel moved by a USB motor. The rotation allowed samples sliding between the positions designated for the acquisition of the Raman spectra and that for artificial ageing. Samples were exposed to artificial light for 45-days and almost 400 spectra for each resin sample were collected. The exposure to artificial light led to significant changes allowing the characterization of the alteration process. The automated acquisition of a large number of spectra overtime during light-exposure has given the possibility to distinguish fast dynamics, mainly associated to solvent evaporation, from those slower due to resins photo-degradation processes.
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Affiliation(s)
- I Osticioli
- Institute of Applied Physics "Nello Carrara" (IFAC-CNR), Florence, Italy.
| | - D Ciofini
- Institute of Applied Physics "Nello Carrara" (IFAC-CNR), Florence, Italy
| | - A A Mencaglia
- Institute of Applied Physics "Nello Carrara" (IFAC-CNR), Florence, Italy
| | - S Siano
- Institute of Applied Physics "Nello Carrara" (IFAC-CNR), Florence, Italy
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Ciofini D, Oujja M, Cañamares MV, Siano S, Castillejo M. Spectroscopic assessment of the UV laser removal of varnishes from painted surfaces. Microchem J 2016. [DOI: 10.1016/j.microc.2015.10.031] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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