Article
Chemistry, Multidisciplinary
Bec J. Roldan, Travis A. Hammerstad, Matthew S. Galliher, Mitchell H. Keylor, Derek A. Pratt, Corey R. J. Stephenson
Summary: A simple method for accessing trans-2,3-diaryl dihydrobenzofurans is described in this article. The method takes advantage of the equilibrium between quinone methide dimers and their persistent radicals. Phenols are used to disrupt this equilibrium and generate transient phenoxyl radicals, allowing for cross-coupling between the persistent and transient radicals. The resulting quinone methides with pendant phenols rapidly cyclize to form dihydrobenzofurans (DHBs), providing a biomimetic approach for the synthesis of resveratrol-based natural products.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Energy & Fuels
Zhengxiao Duan, Yanni Zhang, Jun Deng, Pan Shu, Lele Li
Summary: This study aimed to explore the effect of molecular structure changes on the properties of persistent free radicals in coal during the heating process of coal spontaneous combustion (CSC). In situ electron spin resonance and in situ infrared spectroscopy were used to analyze the persistent free radicals and main functional groups variation characteristics in the process of coal oxidation. The results showed that the concentration of persistent free radicals showed a stage change of first decreasing, then increasing and then decreasing. The dehydrogenation and oxidation reaction of certain functional groups promoted the formation and accumulation of persistent free radicals in coal, which played an important role in triggering CSC.
Article
Dermatology
Henry W. Lim, Indermeet Kohli, Eduardo Ruvolo, Ludger Kolbe, Iltefat H. Hamzavi
Summary: Until recently, the focus of photobiology has been on the impact of UV radiation on skin health, but the significant effects of visible light (VL) on skin have been underreported. VL can cause erythema in light-skinned individuals and pigmentary changes in dark-skinned individuals. These effects are important in dermatologic diseases and may worsen conditions aggravated by sun exposure. One driving mechanism of VL-induced skin pathologies is the induction of free radicals, which leads to melanogenesis and hyperpigmentation. Clinical studies have shown the effectiveness of topical sunscreen with antioxidants in inhibiting VL-induced erythema and reducing pigmentation. Antioxidants can help prevent the worsening of pigmentary disorders and can be incorporated into photoprotective strategies.
JOURNAL OF THE AMERICAN ACADEMY OF DERMATOLOGY
(2022)
Article
Food Science & Technology
Ling Liu, Qi Dong, Youmeng Kong, Yiru Kong, Ziyin Yu, Bin Li, Haixia Yan, Xu Chen, Yixiao Shen
Summary: In this study, the effects and underlying mechanisms of B type procyanidin (PC) on milk protein beta-lactoglobulin (BLG) glyco-oxidation induced by free radicals and metal ions were investigated. The results showed that PC protected BLG from structural changes caused by cross-linking and aggregation. Additionally, PC inhibited BLG oxidation and glycation, reducing carbonyls and advanced glycation end-products (AGEs). PC exhibited free radical scavenging and metal chelating properties, and it also formed procyanidin-MGO conjugates to interrupt BLG glycation. These findings suggest that B type procyanidin is an effective glyco-oxidation inhibitor in milk products.
FOOD RESEARCH INTERNATIONAL
(2023)
Review
Chemistry, Multidisciplinary
Priya Chaudhary, Pracheta Janmeda, Anca Oana Docea, Balakyz Yeskaliyeva, Ahmad Faizal Abdull Razis, Babagana Modu, Daniela Calina, Javad Sharifi-Rad
Summary: Free radicals are reactive oxygen species that circulate through the body and can contribute to the development of diseases when their natural removal mechanisms are disrupted.
FRONTIERS IN CHEMISTRY
(2023)
Article
Polymer Science
Jing Huang, Pierre Yves Le Gac, Emmanuel Richaud
Summary: This study investigated the thermal oxidation of stabilized polydicyclopentadiene and compared the efficacy of three different antioxidants. Results showed that Tinuvin 123 was more efficient than Chimassorb 2020 due to the activated nature of alkoxyamine in Tinuvin 123. The established kinetic model was used for simulation to make reliable lifetime prediction of stabilized PDCDP.
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Engineering, Environmental
Goutham Rangarajan, Ramin Farnood
Summary: This study reports the synthesis of H2SO4-modified biochars as solid-acid catalysts to activate H2O2 under visible light radiation. Results showed that under photo-Fenton conditions, SBC500 can achieve complete MO removal and a TOC reduction.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Anna Gramza-Michalowska, Bartosz Kulczynski, Marta Skopiec, Joanna Kobus-Cisowska, Anna Brzozowska
Summary: The use of yellow tea components in confectionery enhances the antioxidant activity and sensory value of the products, while significantly impacting the taste and color of the final product. Addition of yellow tea extract can increase the anti-radical activity of chocolates, but this effect diminishes after prolonged storage.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Dobrawa Kwasniewska, Justyna Kiewlicz
Summary: The interactions between the cationic surfactant CTAB and ascorbic acid and its derivatives in aqueous media were investigated. Surface tension isotherms were used to determine the critical micelle concentration and adsorption parameters. Infrared analysis contributed to estimating the existence of interactions in the systems. The effect of CTAB-ascorbic acid/ascorbic acid derivatives interactions on antioxidant activity was analyzed.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Review
Biochemistry & Molecular Biology
Christian Schoneich
Summary: Oxidation is a major route of chemical degradation in pharmaceutical formulations, but the mechanisms behind oxidation reactions, particularly the generation of free radicals, are not well understood. This article focuses on formulating these mechanisms based on information about impurities and stress factors from manufacturing, transportation, and storage. It specifically explores autoxidation, metal-catalyzed oxidation, photo-degradation, and radicals generated from cavitation due to mechanical stress, highlighting probable pathways rather than theoretical possibilities.
Article
Biochemistry & Molecular Biology
Enrique Cadenas, Helmut Sies
Summary: Lester Packer, an inspirational scientific leader, had a profound impact on researchers in the field of oxidants and antioxidants. This article highlights key aspects of his career, from his early years at Brooklyn College and Yale University to his influential role at the University of California, Berkeley. His concept of the Antioxidant Network and his ability to foster international collaborations made him a respected figure in the scientific community.
ANTIOXIDANTS & REDOX SIGNALING
(2023)
Article
Chemistry, Physical
Jianhua Qu, Xue Tian, Xiubo Zhang, Jiayi Yao, Jiaqi Xue, Kaige Li, Bo Zhang, Lei Wang, Ying Zhang
Summary: By regulating the addition of oxalic acid, a universal system for reductive radicals formation was developed in the heat/PS system, which effectively degrades highly chlorinated compounds and significantly improves degradation efficiency, rate, and mineralization efficiency.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Multidisciplinary
Abdessamie Kellil, Spyros Grigorakis, Sofia Loupassaki, Dimitris P. Makris
Summary: This study focused on investigating the thermal decomposition of Quercetin (Qt) and the impacts of antioxidants on its degradation. An empirical sigmoidal model was proposed to trace degradation kinetics, and degradation pathways were analyzed through liquid chromatography-tandem mass spectrometry. Antioxidants were found to retard Qt degradation in a manner dependent on Qt/antioxidant molar ratio, with consistent degradation products identified. The study demonstrated the detrimental effects of heating on Qt and proposed a model that could be useful for interpreting the degradation behavior of other polyphenols.
APPLIED SCIENCES-BASEL
(2021)
Review
Biochemistry & Molecular Biology
Carlo Caiati, Alessandro Stanca, Mario Erminio Lepera
Summary: We are exposed to increasing levels of free radicals (FR) due to the widespread usage of man-made chemicals, drugs, smoking, processed foods, and various pollutants. These factors, along with obesity and metabolic syndrome, can cause endothelial damage and inflammation. Antioxidants play a crucial role in repairing this damage and preventing atherosclerosis, particularly at the coronary level.
Article
Thermodynamics
Shoutao Hu, Zijin Hong, Jiancun Gao, Xigang Yang, Le Wang, Ruxia Li, Yujing Li
Summary: The paper investigates the suppressive effect of magnetic fields on alkane gas explosions. Experimental and simulation results combined with gradient magnetic field force reveal the explosion mechanism of alkane gas under a magnetic field. Magnetic fields significantly reduce the maximum explosion pressure, rate of pressure rise, and flame propagation velocity of alkane gas, thereby weakening the gas explosion intensity. The inhibitory effect of magnetic fields on ethane explosions is more substantial compared to methane and propane.
COMBUSTION AND FLAME
(2022)
Article
Chemistry, Organic
O. T. Kasaikina, D. A. Krugovov, E. A. Mengele, M. P. Berezin, D. A. Fokin
PETROLEUM CHEMISTRY
(2015)
Article
Chemistry, Multidisciplinary
E. A. Mengele, D. A. Krugovov, O. T. Kasaikina
RUSSIAN CHEMICAL BULLETIN
(2015)
Article
Chemistry, Physical
O. T. Kasaikina, N. V. Potapova, D. A. Krugovov, L. M. Pisarenko
KINETICS AND CATALYSIS
(2017)
Article
Polymer Science
O. T. Kasaikina, N. V. Potapova, D. A. Krugovov, M. P. Berezin
POLYMER SCIENCE SERIES B
(2017)
Article
Microbiology
S. N. Filippova, N. A. Surgucheva, O. T. Kasaikina, D. A. Krugovov, V. F. Gal'chenko
Article
Chemistry, Organic
D. A. Krugovov, L. M. Pisarenko, V. G. Kondratovich, A. N. Shchegolikhin, O. T. Kasaikina
PETROLEUM CHEMISTRY
(2009)
Article
Chemistry, Multidisciplinary
L. M. Pisarenko, D. A. Krugovov, A. N. Shchegolikhin, O. T. Kasaikina
RUSSIAN CHEMICAL BULLETIN
(2008)
Article
Chemistry, Multidisciplinary
D. A. Krugovov, E. A. Mengele, O. T. Kasaikina
RUSSIAN CHEMICAL BULLETIN
(2014)
Article
Chemistry, Multidisciplinary
O. T. Kasaikina, A. A. Golyavin, D. A. Krugovov, Z. S. Kartasheva, L. M. Pisarenko
MOSCOW UNIVERSITY CHEMISTRY BULLETIN
(2010)
Article
Chemistry, Multidisciplinary
N. A. Trunova, D. A. Krugovov, Yu. G. Bogdanova, O. T. Kasaikina
MOSCOW UNIVERSITY CHEMISTRY BULLETIN
(2008)
Article
Chemistry, Organic
D. A. Krugovov, V. G. Kondratovich, O. T. Kasaikina
PETROLEUM CHEMISTRY
(2007)