Article
Engineering, Environmental
William P. Fagan, Frederick A. Villamena, Jay L. Zweier, Linda K. Weavers
Summary: Ultrasound activated persulfate can synergistically degrade aqueous organic contaminants. The synergistic effect increases with temperature, indicating that temperature has a significant influence on the ultrasound activated persulfate process.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Polymer Science
Nikola Babic, Simon Pondaven, Herve Vezin
Summary: Autoxidation is a common spontaneous oxygen-mediated radical reaction in the degradation processes of hydrocarbon-based materials. In this study, EPR spin-trapping technique was used to investigate radical species involved in the autoxidation of synthetic base oil. The difference in generating radical species between aged and non-aged samples of the same base oil was studied by introducing oxygen and aging the samples at 140 degrees C.
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Acoustics
Zhen-Dan Xue, Qing-An Zhang, Hong-Rong Zheng
Summary: Ultrasound promotes the formation of acetaldehyde in model wine solutions by inducing hydroxyl radicals and 1-hydroxyethyl free radicals, with the latter having an inverse relationship with acetaldehyde formation. Additionally, the presence of Fe2+ and ethanol also influence the generation of acetaldehyde.
ULTRASONICS SONOCHEMISTRY
(2021)
Editorial Material
Biochemistry & Molecular Biology
Toshihiko Ozawa, Ikuo Nakanishi
Summary: This commentary describes a highly cited paper published in the Archives of Biochemistry and Biophysics in 1980, which reviewed reports on spin trapping and hydroxyl radicals, contributing to the development of oxidative stress research.
ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
(2022)
Article
Multidisciplinary Sciences
Aidin R. Balo, Alessio Caruso, Lizhi Tao, Dean J. Tantillo, Mohammad R. Seyedsayamdost, R. David Britt
Summary: Using electron paramagnetic resonance (EPR) spectroscopy, this study dissected the mechanism of SuiB and revealed the essential role of the auxiliary [4Fe-4S] cluster in catalysis, confirming the proposed radical electrophilic aromatic substitution (rEAS) mechanism for the formation of the Lys-Trp cross-link. The findings provide direct evidence for the involvement of the SPASM domain auxiliary cluster and support rEAS as the mechanistic paradigm for rSAM enzyme-catalyzed carbon-carbon bond-forming reactions.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Multidisciplinary
Elsa Walger, Nathalie Marlin, Gerard Mortha, Florian Molton, Carole Duboc
Summary: This study investigates the production of radicals by the H2O2/Cu-II-Phen system at near-neutral and alkaline pHs, demonstrating the enhancement of H2O2 decomposition by Phen tuning the electronic structure and structural properties of Cu-II complexes.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Constantinos Nicolaides, Fadwat Bazzi, Evangelos Vouros, Dragos F. Flesariu, Nicolas Chrysochos, Panayiotis A. Koutentis, Christos P. Constantinides, Theodossis Trypiniotis
Summary: In this study, spin current emission from an organic radical film via spin pumping at room temperature was demonstrated. A Blatter-type radical with outstanding stability and low roughness was synthesized and prepared as a thin film. The reversible reduction of spin current emission from the organic radical layer was achieved when brought into simultaneous resonance with a ferromagnetic film. These results provide experimental evidence of a metal-free organic radical layer operating as a spin source, offering possibilities for the development of purely organic spintronic devices and bridging the gap between potential and real applications.
Article
Chemistry, Multidisciplinary
Vega Lloveras, Pilar Elias-Rodriguez, Luca Bursi, Ehsan Shirdel, Alejandro R. Goni, Arrigo Calzolari, Jose Vidal-Gancedo
Summary: This study reports the first demonstration of a surface molecular switch based on gold nanoparticles (AuNPs) decorated with persistent perchlorotriphenylmethyl (PTM) radicals. The redox properties of PTM are exploited to fabricate electrochemical switches with high stability and reversibility. The electronic interaction between the radicals and the gold surface is investigated and confirmed by multiple experimental techniques.
Article
Polymer Science
Thu Anh Nguyen, Shota Ichise, Kenji Kinashi, Wataru Sakai, Naoto Tsutsumi, Satoko Okubayashi
Summary: The thermal degradation mechanism of poly(propylene) fabric was analyzed using the electron spin resonance (ESR) spin-trapping technique. The results showed that the degradation of poly(propylene) starts from the tertiary carbon positions and involves various pathways of radical formation, which further participate in the degradation process of poly(propylene).
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Chemistry, Multidisciplinary
Haochuan Mao, Gediminas J. Pazera, Ryan M. Young, Matthew D. Krzyaniak, Michael R. Wasielewski
Summary: Researchers have addressed the challenges of achieving good spin-qubit addressability by using a D-A1-A2 molecule with reduced hyperfine couplings. They demonstrated the successful operation of a spin-qubit pair (SQP) in a liquid crystal, performing both single-qubit and two-qubit gate operations.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Jun-Ru Chen, Ting-Xi Ke, Perry A. Frey, Shyue-Chu Ke
Summary: The ESEEM spectroscopy uncovers multiple interactions that aid in the formation of the 5'-deoxyadenosyl radical in lysine 5,6-aminomutase, such as the Co-II -His133 beta interaction and the transfer of spin density from the substrate radical to the adenine N7 of 5'-dAdoH. These interactions promote the forward H-transfer reaction and the quenching of 5'-dAdo(center dot), showing how enzymes modulate radical stability.
Article
Chemistry, Multidisciplinary
Caroline J. Aschendorf, Mawuli Degbevi, Keaton V. Prather, Emily Y. Tsui
Summary: The participation of the surfaces of colloidal semiconductor nanocrystal quantum dots in QD-mediated photocatalytic reactions is crucial and should be considered in the design of photocatalysis. The study explores the reactivity of surface sulfides and selenides of metal chalcogenide QDs and demonstrates the importance of QD surfaces beyond tuning their band gaps.
Article
Multidisciplinary Sciences
Alberto Hernandez-Minguez, Alexander Poshakinskiy, Michael Hollenbach, Paulo Santos, Georgy Astakhov
Summary: This study demonstrates a new method of acoustic manipulation of spin qubits, showing a significant interaction between surface acoustic waves and the excited-state spin of silicon vacancies, which leads to more coherent spin control. By simultaneously driving spins in the ground and excited states with the same surface acoustic wave, the spins can be trapped along a specific direction. This coherent acoustic manipulation of spins in different states opens up new opportunities for on-chip quantum information protocols and coherent sensing.
Article
Biochemistry & Molecular Biology
Wen Qi, Pooja Yadav, Cho R. Hong, Ralph J. Stevenson, Michael P. Hay, Robert F. Anderson
Summary: This study provides evidence for the formation of aryl radicals and carbon C-centered radicals in some compounds, as well as evidence for the scavenging of free radicals. However, hypoxia-selective cytotoxicity is not related to the formation of aryl radicals in BTO compounds.
Article
Chemistry, Physical
Yi Ren, P. J. Hore
Summary: Chiral molecules can act as spin filters, preferentially transmitting electrons with spins polarized along their direction of travel. The magnetic properties of transient radical pairs can optimize the visibility of CISS polarization in time-resolved EPR spectra without the need for orientation or alignment of their precursors.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Engineering, Chemical
Eddy Plasquy, Jose Maria Garcia Martos, Maria del Carmen Florido Fernandez, Rafael Ruben Sola-Guirado, Juan Francisco Garcia Martin
Summary: The study examines the use of warm water to warm up olives before grinding to maintain a desired temperature, which is crucial for high-quality oil extraction. Results show the feasibility of the method and potential for further automation to improve efficiency and quality in olive processing.
Review
Engineering, Chemical
Francisco Jose Sanchez-Borrego, Paloma Alvarez-Mateos, Juan F. Garcia-Martin
Summary: Bio-oil is a promising source of chemicals and renewable fuels that can replace fossil fuels and be produced through pyrolysis. It contains various value-added chemicals, such as aromatic compounds, suitable for a range of applications.
Editorial Material
Engineering, Chemical
Miguel Torres-Garcia, Paloma Alvarez-Mateos, Juan Francisco Garcia-Martin
Article
Food Science & Technology
Chao-Hui Feng, Chiko Otani, Yuichi Ogawa, Juan F. Garcia-Martin
Summary: The Terahertz time-domain spectroscopy (THz-TDS) system was used to analyze the spectral changes of sausage hog and sheep casings before and after casing modification, showing higher absorbances for modified cases. The drying process under nitrogen gas significantly reduced the drying time for natural hog casing made from soy oil.
Article
Engineering, Chemical
Carmen C. Barrios, Paloma Alvarez-Mateos, Ana Uruena, David Diez, Juan Francisco Garcia-Martin
Summary: The study aimed to assess the impact of adding an oxygenated additive to biodiesel in reducing particle emissions from engines without diesel particle filters. Results showed that certain blends increased NOx emissions, while one specific blend significantly reduced total particle number and NOx emissions.
Article
Food Science & Technology
Karine Cristine Kaufmann, Klicia Araujo Sampaio, Juan F. Garcia-Martin, Douglas Fernandes Barbin
Summary: The study demonstrates that coriander oil can be effectively distinguished from adulterated oils using principal component analysis, linear discriminant analysis, and k-nearest neighbors algorithm. The performance of Partial Least Squares regression models also shows their potential utility in quality control processes.
Article
Agronomy
Francisco-Jose Sanchez-Borrego, Noelia Garcia-Criado, Juan F. Garcia-Martin, Paloma alvarez-Mateos
Summary: This study investigates the pyrolysis of orange waste and orange pruning to produce biochar and bio-oil for high-added-value compounds. The obtained biochar showed potential for reducing the sulphur content in waste cooking oil.
Article
Plant Sciences
Francisco Jose Sanchez-Borrego, Tomas Juan Barea de Hoyos-Limon, Juan Francisco Garcia-Martin, Paloma Alvarez-Mateos
Summary: Olive stones can be valorized through pyrolysis to obtain biochar and bio-oil, with temperature being the key parameter affecting the product distribution. Impregnated olive stones result in higher amounts of high-added-value products. The specific surface area of biochar has an impact on the esterification yield.
Review
Chemistry, Analytical
Juan Francisco Garcia Martin
Summary: The physico-chemical parameters of olive oil quality can be effectively measured using near-infrared spectroscopy (NIRS), with high precision for several important parameters. NIRS is suitable for predicting nutritional contents and has the potential for analyzing other parameters, although further improvement of mathematical models is required.
Article
Engineering, Chemical
Sebastian Sanchez, Inmaculada Olivares, Juan G. Puentes, Rafael Orpez, M. Dolores La Rubia, Rafael Pacheco, Juan F. Garcia Martin
Summary: The addition of high-purity NMT improved the extraction yields and quality of olive oil, especially enhancing the content of antioxidant compounds and increasing the oxidative stability of the oil.
Editorial Material
Engineering, Chemical
Juan Francisco Garcia Martin, Miguel Torres Garcia, Paloma Alvarez Mateos
Review
Acoustics
Qing-An Zhang, Hongrong Zheng, Junyan Lin, Guangmin Nie, Xuehui Fan, Juan Francisco Garcia-Martin
Summary: As a non-thermal physical technology, ultrasound is widely used in various food processing operations, including filtration, freezing, thawing, sterilization, cutting, extraction, aging, etc. It is also applied in the processing of meat products, fruits and vegetables, and dairy products. However, there is a lack of systematic sorting and summarizing of the impact of ultrasound on different characteristics of wine. This review aims to systematically summarize the current achievements and problems of ultrasound application in winemaking, including extraction, fermentation, aging, and sterilization, and discuss its advantages, disadvantages, and future development.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Engineering, Chemical
Antonio Rosales Martinez, Juan F. Garcia-Martin, Ignacio Rodriguez-Garcia
Summary: Significant efforts have been made to develop sustainable reduction reactions for organic and bioorganic compounds, with the selection of reagents and solvents playing a crucial role. Cp2TiCl/H2O has emerged as a safe, efficient, selective, and low-cost reagent, offering a sustainable alternative for organic compound reduction. This study focuses on describing the intermediates, mechanisms, and representative examples to enhance understanding of reductions facilitated by this system. Future perspectives are discussed, including the use of its analog Cp2TiCl/D2O as a powerful tool for preparing deuterated phenols as internal standards for analyzing bioactive phenols in olive oil.
Article
Engineering, Chemical
Fangchen Ding, Changzhou Zuo, Juan Francisco Garcia-Martin, Yan Ge, Kang Tu, Jing Peng, Hongmei Xiao, Weijie Lan, Leiqing Pan
Summary: Different packaging materials, such as PVC, PE, and EPE, have significant effects on the near infrared (NIR) prediction of mango quality. The spectral interferences resulting from these materials can be reduced using spectral filtering methods. Combining spectral filtering with variable selection methods can further improve the prediction accuracy of mango quality parameters.
JOURNAL OF FOOD ENGINEERING
(2023)
Article
Biotechnology & Applied Microbiology
Manuel Cuevas, Juan F. Garcia Martin, Vicente Bravo, Sebastian Sanchez
Summary: This study investigated the potential of producing bioethanol from olive stones through liquid hot-water pre-treatment and subsequent enzymatic hydrolysis. The results showed that under the most suitable conditions, 6.4 dm(3) of ethanol per 100 kg of olive stones could be produced through this process.
FERMENTATION-BASEL
(2021)