Neutron News 2 Science Snapshot Towards Neutron Scattering Identification of Olive Oil’s Antioxid... more Neutron News 2 Science Snapshot Towards Neutron Scattering Identification of Olive Oil’s Antioxidant Properties Roberto Senesi1 , Carla Andreani1 , Piero Baglioni2, Luis A. E. Batista de Carvalho3 , Silvia Licoccia4 , Maria P. M. Marques3,5 , Giulia Moretti2, Annalisa Noce6 , Roberto Paolesse4 , Stewart F. Parker7 , Enrico Preziosi1, Giovanni Romanelli7 , Annalisa Romani8, and Nicola Di Daniele6 1 Physics Department and NAST Centre, Università degli Studi di Roma “Tor Vergata”, Rome, Italy 2 CSGI and Chemistry Department, University of Florence, Florence, Italy 3 Molecular Physical-Chemistry R&D Unit, Department of Chemistry, University of Coimbra, Coimbra, Portugal 4 Chemical Science and Technologies Department and NAST Centre, Università degli Studi di Roma “Tor Vergata”, Rome, Italy 5 Department of Life Sciences, University of Coimbra, Coimbra, Portugal 6 UOC of Internal Medicine-Center of Hypertension and Nephrology Unit, Department of Systems Medicine, Università degli Studi di Roma “Tor Vergata”, Rome, Italy 7 ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, UK 8 PHYTOLAB (Pharmaceutical, Cosmetic, Food Supplement, Technology and Analysis)-DiSIA, University of Florence, Sesto Fiorentino, Italy roberto.senesi@uniroma2.it
Extra virgin olive oil (EVOO) is defined as a functional food as it contains numerous phenolic co... more Extra virgin olive oil (EVOO) is defined as a functional food as it contains numerous phenolic components with well-recognized health-beneficial properties, such as high antioxidant and anti-inflammatory capacity. These characteristics depend on their structural/conformational behavior, which is largely determined by intra- and intermolecular H-bond interactions. While the vibrational dynamics of isolated compounds have been studied in a number of recent investigations, their signal in a real-life sample of EVOO is overwhelmed by the major constituent acids. Here, we provide a full characterization of the vibrational spectroscopic signal from commercially available EVOO samples using Inelastic Neutron Scattering (INS) and Raman spectroscopies. The spectra are dominated by CH2 vibrations, especially at about 750 cm−1 and 1300 cm−1. By comparison with the spectra from hydroxytyrosol and other minor phenolic compounds, we show that the best regions in which to look for the structure–ac...
Beside its promising applications in the design of multifunctional materials, batteries and biose... more Beside its promising applications in the design of multifunctional materials, batteries and biosensors, the pigment Prussian blue is still studied in heritage science because of its capricious fading behavior due to a complex light-induced redox mechanism. We studied model heritage materials composed of Prussian blue embedded into a cellulosic fiber substrate by means of X-ray absorption near-edge spectroscopy. Significant X-ray radiation damage was observed and characterized. X-ray radiation induced first a reduction of Prussian blue, in a similar way to what visible light does, followed by a complete degradation of the pigment and the formation of iron(III) oxyhydroxide. We took advantage of this X-ray photochemistry to investigate in depth the redox behavior of Prussian blue. We could particularly demonstrate that the rate, extent, and quality of Prussian blue photoreduction can be tuned by modifying the pH and alkali cation content of the cellulosic substrate. The present study represents a step further in the understanding of Prussian blue heritage materials from an electrochemical viewpoint and provides evidence of substrate-mediated photochemistry applicable to a wider class of Prussian blue composite materials.
Neutron News 2 Science Snapshot Towards Neutron Scattering Identification of Olive Oil’s Antioxid... more Neutron News 2 Science Snapshot Towards Neutron Scattering Identification of Olive Oil’s Antioxidant Properties Roberto Senesi1 , Carla Andreani1 , Piero Baglioni2, Luis A. E. Batista de Carvalho3 , Silvia Licoccia4 , Maria P. M. Marques3,5 , Giulia Moretti2, Annalisa Noce6 , Roberto Paolesse4 , Stewart F. Parker7 , Enrico Preziosi1, Giovanni Romanelli7 , Annalisa Romani8, and Nicola Di Daniele6 1 Physics Department and NAST Centre, Università degli Studi di Roma “Tor Vergata”, Rome, Italy 2 CSGI and Chemistry Department, University of Florence, Florence, Italy 3 Molecular Physical-Chemistry R&D Unit, Department of Chemistry, University of Coimbra, Coimbra, Portugal 4 Chemical Science and Technologies Department and NAST Centre, Università degli Studi di Roma “Tor Vergata”, Rome, Italy 5 Department of Life Sciences, University of Coimbra, Coimbra, Portugal 6 UOC of Internal Medicine-Center of Hypertension and Nephrology Unit, Department of Systems Medicine, Università degli Studi di Roma “Tor Vergata”, Rome, Italy 7 ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, UK 8 PHYTOLAB (Pharmaceutical, Cosmetic, Food Supplement, Technology and Analysis)-DiSIA, University of Florence, Sesto Fiorentino, Italy roberto.senesi@uniroma2.it
Extra virgin olive oil (EVOO) is defined as a functional food as it contains numerous phenolic co... more Extra virgin olive oil (EVOO) is defined as a functional food as it contains numerous phenolic components with well-recognized health-beneficial properties, such as high antioxidant and anti-inflammatory capacity. These characteristics depend on their structural/conformational behavior, which is largely determined by intra- and intermolecular H-bond interactions. While the vibrational dynamics of isolated compounds have been studied in a number of recent investigations, their signal in a real-life sample of EVOO is overwhelmed by the major constituent acids. Here, we provide a full characterization of the vibrational spectroscopic signal from commercially available EVOO samples using Inelastic Neutron Scattering (INS) and Raman spectroscopies. The spectra are dominated by CH2 vibrations, especially at about 750 cm−1 and 1300 cm−1. By comparison with the spectra from hydroxytyrosol and other minor phenolic compounds, we show that the best regions in which to look for the structure–ac...
Beside its promising applications in the design of multifunctional materials, batteries and biose... more Beside its promising applications in the design of multifunctional materials, batteries and biosensors, the pigment Prussian blue is still studied in heritage science because of its capricious fading behavior due to a complex light-induced redox mechanism. We studied model heritage materials composed of Prussian blue embedded into a cellulosic fiber substrate by means of X-ray absorption near-edge spectroscopy. Significant X-ray radiation damage was observed and characterized. X-ray radiation induced first a reduction of Prussian blue, in a similar way to what visible light does, followed by a complete degradation of the pigment and the formation of iron(III) oxyhydroxide. We took advantage of this X-ray photochemistry to investigate in depth the redox behavior of Prussian blue. We could particularly demonstrate that the rate, extent, and quality of Prussian blue photoreduction can be tuned by modifying the pH and alkali cation content of the cellulosic substrate. The present study represents a step further in the understanding of Prussian blue heritage materials from an electrochemical viewpoint and provides evidence of substrate-mediated photochemistry applicable to a wider class of Prussian blue composite materials.
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