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Guo Y, Pina A, Gabbanini S, Valgimigli L. Absolute kinetics of peroxidation and antioxidant protection of intact triglyceride vegetable oils. Food Chem 2024; 452:139289. [PMID: 38713979 DOI: 10.1016/j.foodchem.2024.139289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Revised: 03/31/2024] [Accepted: 04/07/2024] [Indexed: 05/09/2024]
Abstract
To verfy their difference from isolated fatty acids, the absolute kinetics of peroxidation was studied for seven triglyceride-based oils of olive (OLI-1, OLI-2), high-oleic sunflower (SUN-HO), high-oleic and high-linoleic safflower (SAF-HO, SAF-HL) grapeseed (GRA) and borage (BOR), by oxygen uptake monitoring, using 2,6-di-tert-butyl-4-methoxyphenol and 2,2,5,7,8-pentamethyl-6-chromanol as reference inhibitors. Propagation constants (kp/M-1 s-1 at 303 K in PhCl) were respectively 34.8 ± 2.3, 35.1 ± 1.8, 40.6 ± 5.5, 36.0 ± 7.7, 160.8 ± 5.1, 145.1 ± 24.5, 275.1 ± 63.8, while oxidizability responded to empirical equation kp(2kt)-½/M-½s-½ = 1.63 × 10-3[allyl >CH2/M] + 1.82 × 10-2[bisallyl >CH2/M], based on fatty acids residues assessed by GC-MS. Peroxidation kinetics was markedly different from that of isolated fatty acids. The H-bond basicity of all oils was measured by FT-IR affording Abraham's βH2 values in the range 0.55 ± 0.03. H-bonding explained the protection of oils measured for seven reference phenolic antioxidants, except for the catechols quercetin and caffeic acid phenethyl ester, which were 2-to-4-folds more effective than expected, supporting a proposed different mechanism.
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Affiliation(s)
- Yafang Guo
- University of Bologna, Department of Chemistry "G. Ciamician", Via P. Gobetti 85, 40129 Bologna, Italy
| | - Albert Pina
- University of Bologna, Department of Chemistry "G. Ciamician", Via P. Gobetti 85, 40129 Bologna, Italy
| | - Simone Gabbanini
- BeC s.r.l., R&D Division, Via C. Monteverdi 49, 47122 Forlì, Italy
| | - Luca Valgimigli
- University of Bologna, Department of Chemistry "G. Ciamician", Via P. Gobetti 85, 40129 Bologna, Italy; Tecnopolo di Rimini, Via Dario Campana 71, 47922 Rimini, Italy.
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2
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Gabbanini S, Neba JN, Matera R, Valgimigli L. Photochemical and Oxidative Degradation of Chamazulene Contained in Artemisia, Matricaria and Achillea Essential Oils and Setup of Protection Strategies. Molecules 2024; 29:2604. [PMID: 38893479 PMCID: PMC11173868 DOI: 10.3390/molecules29112604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Revised: 05/23/2024] [Accepted: 05/25/2024] [Indexed: 06/21/2024] Open
Abstract
Chamazulene (CA) is an intensely blue molecule with a wealth of biological properties. In cosmetics, chamazulene is exploited as a natural coloring and soothing agent. CA is unstable and tends to spontaneously degrade, accelerated by light. We studied the photodegradation of CA upon controlled exposure to UVB-UVA irradiation by multiple techniques, including GC-MS, UHPLC-PDA-ESI-MS/MS and by direct infusion in ESI-MSn, which were matched to in silico mass spectral simulations to identify degradation products. Seven byproducts formed upon UVA exposure for 3 h at 70 mW/cm2 (blue-to-green color change) were identified, including CA dimers and CA benzenoid, which were not found on extended 6 h irradiation (green-to-yellow fading). Photostability tests with reduced irradiance conducted in various solvents in the presence/absence of air indicated highest degradation in acetonitrile in the presence of oxygen, suggesting a photo-oxidative mechanism. Testing in the presence of antioxidants (tocopherol, ascorbyl palmitate, hydroxytyrosol, bakuchiol, γ-terpinene, TEMPO and their combinations) indicated the highest protection by tocopherol and TEMPO. Sunscreens ethylhexyl methoxycinnamate and particularly Tinosorb® S (but not octocrylene) showed good CA photoprotection. Thermal stability tests indicated no degradation of CA in acetonitrile at 50 °C in the dark for 50 days; however, accelerated degradation occurred in the presence of ascorbyl palmitate.
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Affiliation(s)
- Simone Gabbanini
- R&D Department, BeC s.r.l., Via C. Monteverdi 49, 47122 Forlì, Italy;
| | - Jerome Ngwa Neba
- Department of Chemistry “Ciamician”, University of Bologna, Via Gobetti 85, 40129 Bologna, Italy;
| | - Riccardo Matera
- R&D Department, BeC s.r.l., Via C. Monteverdi 49, 47122 Forlì, Italy;
| | - Luca Valgimigli
- Department of Chemistry “Ciamician”, University of Bologna, Via Gobetti 85, 40129 Bologna, Italy;
- Tecnopolo di Rimini, Via D. Campana 71, 47922 Rimini, Italy
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3
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Pan W, Giovanardi I, Sagynova T, Cariola A, Bresciani V, Masetti M, Valgimigli L. Potent Antioxidant and Anti-Tyrosinase Activity of Butein and Homobutein Probed by Molecular Kinetic and Mechanistic Studies. Antioxidants (Basel) 2023; 12:1763. [PMID: 37760066 PMCID: PMC10525132 DOI: 10.3390/antiox12091763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 09/06/2023] [Accepted: 09/11/2023] [Indexed: 09/29/2023] Open
Abstract
Butein (BU) and homobutein (HB) are bioactive polyhydroxylated chalcones widespread in dietary plants, whose antioxidant properties require mechanistic definition. They were investigated by inhibited autoxidation kinetic studies of methyl linoleate in Triton™ X-100 micelles at pH 7.4, 37 °C. Butein had kinh = (3.0 ± 0.9) × 104 M-1s-1 showing a chain-breaking mechanism with higher antioxidant activity than reference α-tocopherol (kinh = (2.2 ± 0.6) × 104 M-1s-1), particularly concerning the stoichiometry or peroxyl radical trapping n = 3.7 ± 1.1 vs. 2.0 for tocopherol. Homobutein had kinh = (2.8 ± 0.9) × 103 M-1s-1, pairing the relative BDEOH measured by radical equilibration EPR as 78.4 ± 0.2 kcal/mol for BU and estimated as 82.6 kcal/mol for HB. The inhibition of mushroom tyrosinase (mTYR) by HB and BU was also investigated. BU gives a reversible uncompetitive inhibition of monophenolase reaction with KI' = 9.95 ± 2.69 µM and mixed-type diphenolase inhibition with KI = 3.30 ± 0.75 µM and KI' = 18.75 ± 5.15 µM, while HB was nearly competitive toward both mono- and diphenolase with respective KI of 2.76 ± 0.70 µM and 2.50 ± 1.56 µM. IC50 values (monophenolase/diphenolase at 1 mM substrate) were 10.88 ± 2.19 µM/15.20 ± 1.25 µM, 14.78 ± 1.05 µM/12.36 ± 2.00 µM, and 33.14 ± 5.03 µM/18.27 ± 3.42 µM, respectively, for BU, HB, and reference kojic acid. Molecular docking studies confirmed the mechanism. Results indicate very potent antioxidant activity for BU and potent anti-tyrosinase activity for both chalcones, which is discussed in relation to bioactivity toward protection from skin disorders and food oxidative spoilage.
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Affiliation(s)
- Wenkai Pan
- Department of Chemistry “G. Ciamician”, University of Bologna, Via P. Gobetti 85, 40129 Bologna, Italy
| | - Ilaria Giovanardi
- Department of Chemistry “G. Ciamician”, University of Bologna, Via P. Gobetti 85, 40129 Bologna, Italy
- Tecnopolo di Rimini, Via Dario Campana 71, 47922 Rimini, Italy
| | - Tomiris Sagynova
- Department of Chemistry “G. Ciamician”, University of Bologna, Via P. Gobetti 85, 40129 Bologna, Italy
- Tecnopolo di Rimini, Via Dario Campana 71, 47922 Rimini, Italy
| | - Alice Cariola
- Department of Chemistry “G. Ciamician”, University of Bologna, Via P. Gobetti 85, 40129 Bologna, Italy
- Tecnopolo di Rimini, Via Dario Campana 71, 47922 Rimini, Italy
| | - Veronica Bresciani
- Department of Pharmacy and Biotechnology, University of Bologna, Via Belmeloro 6, 40126 Bologna, Italy
- Computational and Chemical Biology, Italian Institute of Technology, Via Enrico Melen 83, 16152 Genova, Italy
| | - Matteo Masetti
- Department of Pharmacy and Biotechnology, University of Bologna, Via Belmeloro 6, 40126 Bologna, Italy
| | - Luca Valgimigli
- Department of Chemistry “G. Ciamician”, University of Bologna, Via P. Gobetti 85, 40129 Bologna, Italy
- Tecnopolo di Rimini, Via Dario Campana 71, 47922 Rimini, Italy
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Valgimigli L. Lipid Peroxidation and Antioxidant Protection. Biomolecules 2023; 13:1291. [PMID: 37759691 PMCID: PMC10526874 DOI: 10.3390/biom13091291] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 08/17/2023] [Accepted: 08/21/2023] [Indexed: 09/29/2023] Open
Abstract
Lipid peroxidation (LP) is the most important type of oxidative-radical damage in biological systems, owing to its interplay with ferroptosis and to its role in secondary damage to other biomolecules, such as proteins. The chemistry of LP and its biological consequences are reviewed with focus on the kinetics of the various processes, which helps understand the mechanisms and efficacy of antioxidant strategies. The main types of antioxidants are discussed in terms of structure-activity rationalization, with focus on mechanism and kinetics, as well as on their potential role in modulating ferroptosis. Phenols, pyri(mi)dinols, antioxidants based on heavy chalcogens (Se and Te), diarylamines, ascorbate and others are addressed, along with the latest unconventional antioxidant strategies based on the double-sided role of the superoxide/hydroperoxyl radical system.
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Affiliation(s)
- Luca Valgimigli
- Department of Chemistry "G. Ciamician", University of Bologna, Via Piero Gobetti 85, 40129 Bologna, Italy
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Kumar M, Sharma D, Singh VP. Modulation of the chain-breaking antioxidant activity of phenolic organochalcogens with various co-antioxidants at various pH values. Org Biomol Chem 2023; 21:1316-1327. [PMID: 36648399 DOI: 10.1039/d2ob01988d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Phenolic organochalcogen chain-breaking antioxidants, i.e. 6-bromo-8 (hexadecyltellanyl)-3,3-dimethyl-1,5-dihydro-[1,3]dioxepino[5,6-c]pyridin-9-ol and 2-methyl-2,3-dihydrobenzo[b]selenophene-5-ol, have been investigated in a two-phase (chlorobenzene/water) lipid peroxidation model system as potent inhibitors of lipid peroxyl radicals with various co-antioxidants at various pH values. The pH has a significant effect on the chain-breaking antioxidant activities of phenolic organochalcogens. The key chain-breaking mechanism profile was attributed to the first oxygen atom transfer from the lipid peroxyl radicals to the Se/Te atom, followed by hydrogen atom transfer in a solvent cage from the nearby phenolic group to the resulting alkoxyl radical. Finally, regeneration of organochalcogen antioxidants could take place in the presence of aqueous-soluble co-antioxidants. Also, in the presence of aqueous soluble N-acetylcysteine at pH 1-7, both antioxidants behaved as very good inhibitors of lipid peroxyl radicals. The role of aqueous soluble mild co-antioxidants in the regeneration studies of organochalcogen antioxidants has been investigated in a two-phase lipid peroxidation model system. The importance of the phase transfer catalyst has been explored in the inhibition studies of selenium containing antioxidants using an Fe(II) source. The overall pH-dependent antioxidant activities of organochalcogens depend on their hydrogen atom transfer ability, relative stability, and distribution in the aqueous/lipid phase.
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Affiliation(s)
- Manish Kumar
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Sector-14, Chandigarh - 160 014, India.
| | - Deepika Sharma
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Sector-14, Chandigarh - 160 014, India.
| | - Vijay P Singh
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Sector-14, Chandigarh - 160 014, India.
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6
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Cariola A, El Chami M, Granatieri J, Valgimigli L. Anti-Tyrosinase and Antioxidant Activity of Meroterpene Bakuchiol from Psoralea corylifolia (L.). Food Chem 2022; 405:134953. [DOI: 10.1016/j.foodchem.2022.134953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 11/08/2022] [Accepted: 11/10/2022] [Indexed: 11/18/2022]
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Mena LD, Baumgartner MT. Chalcogen Atoms as Electron Donors in Proton-Coupled Electron Transfer Reactions. J Am Chem Soc 2022; 144:15922-15927. [PMID: 36018719 DOI: 10.1021/jacs.2c05602] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Proton-coupled electron transfer (PCET) reactions are crucial for the optimal functioning of a broad scope of chemical and biological processes. In this report, we present an unprecedented type of concerted PCET (cPCET), in which a chalcogen atom acts as the electron donor. The nature of this mechanism is key for understanding the reactivity of different radical-trapping antioxidants having heavy chalcogens (S, Se, or Te) in their structures. Moreover, this chalcogen-assisted cPCET is likely to be occurring in multiple systems of biological interest.
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Affiliation(s)
- Leandro D Mena
- QUIAMM-INBIOTEC-Departamento de Química, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Mar del Plata B7600, Argentina
| | - María T Baumgartner
- INFIQC, Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba X5000, Argentina
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Tellurium-Ligated Pd(II) Complex of Bulky Organotellurium Ligand as a Catalyst of Suzuki coupling: First Report on In Situ Generation of Bimetallic Alloy ‘Telluropalladinite’ (Pd9Te4) Nanoparticles and Role in Highly Efficient Catalysis. Catal Letters 2022. [DOI: 10.1007/s10562-021-03769-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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9
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Complexes of metals with organotellurium compounds and nanosized metal tellurides for catalysis, electrocatalysis and photocatalysis. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214406] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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10
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Alfieri ML, Cariola A, Panzella L, Napolitano A, d'Ischia M, Valgimigli L, Crescenzi O. Disentangling the Puzzling Regiochemistry of Thiol Addition to o-Quinones. J Org Chem 2022; 87:4580-4589. [PMID: 35266705 PMCID: PMC8981336 DOI: 10.1021/acs.joc.1c02911] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
![]()
The addition of thiol
compounds to o-quinones,
as exemplified by the biologically relevant conjugation of cysteine
to dopaquinone, displays an anomalous 1,6-type regiochemistry compared
to the usual 1,4-nucleophilic addition, for example, by amines, which
has so far eluded intensive investigations. By means of an integrated
experimental and computational approach, herein, we provide evidence
that the addition of glutathione, cysteine, or benzenethiol to 4-methyl-o-benzoquinone, modeling dopaquinone, proceeds by a free
radical chain mechanism triggered by the addition of thiyl radicals
to the o-quinone. In support of this conclusion,
DFT calculations consistently predicted the correct regiochemistry
only for the proposed thiyl radical-quinone addition pathway. These
results would prompt a revision of the commonly accepted mechanisms
for thiol-o-quinone conjugation and stimulate further
work aimed at assessing the impact of the free radical processes in
biologically relevant thiol–quinone interactions.
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Affiliation(s)
- Maria L Alfieri
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 21, Naples I-80126, Italy
| | - Alice Cariola
- Department of Chemistry "Giacomo Ciamician", University of Bologna, Via S. Giacomo 11, Bologna I-40126, Italy
| | - Lucia Panzella
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 21, Naples I-80126, Italy
| | - Alessandra Napolitano
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 21, Naples I-80126, Italy
| | - Marco d'Ischia
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 21, Naples I-80126, Italy
| | - Luca Valgimigli
- Department of Chemistry "Giacomo Ciamician", University of Bologna, Via S. Giacomo 11, Bologna I-40126, Italy
| | - Orlando Crescenzi
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 21, Naples I-80126, Italy
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Alfieri ML, Panzella L, Amorati R, Cariola A, Valgimigli L, Napolitano A. Role of Sulphur and Heavier Chalcogens on the Antioxidant Power and Bioactivity of Natural Phenolic Compounds. Biomolecules 2022; 12:90. [PMID: 35053239 PMCID: PMC8774257 DOI: 10.3390/biom12010090] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 01/03/2022] [Accepted: 01/04/2022] [Indexed: 02/06/2023] Open
Abstract
The activity of natural phenols is primarily associated to their antioxidant potential, but is ultimately expressed in a variety of biological effects. Molecular scaffold manipulation of this large variety of compounds is a currently pursued approach to boost or modulate their properties. Insertion of S/Se/Te containing substituents on phenols may increase/decrease their H-donor/acceptor ability by electronic and stereo-electronic effects related to the site of substitution and geometrical constrains. Oxygen to sulphur/selenium isosteric replacement in resveratrol or ferulic acid leads to an increase in the radical scavenging activity with respect to the parent phenol. Several chalcogen-substituted phenols inspired by Vitamin E and flavonoids have been prepared, which in some cases prove to be chain-breaking antioxidants, far better than the natural counterparts. Conjugation of catechols with biological thiols (cysteine, glutathione, dihydrolipoic acid) is easily achieved by addition to the corresponding ortho-quinones. Noticeable examples of compounds with potentiated antioxidant activities are the human metabolite 5-S-cysteinyldopa, with high iron-induced lipid peroxidation inhibitory activity, due to strong iron (III) binding, 5-S-glutathionylpiceatannol a most effective inhibitor of nitrosation processes, and 5-S-lipoylhydroxytyrosol, and its polysulfides that proved valuable oxidative-stress protective agents in various cellular models. Different methodologies have been used for evaluation of the antioxidant power of these compounds against the parent compounds. These include kinetics of inhibition of lipid peroxidation alkylperoxyl radicals, common chemical assays of radical scavenging, inhibition of the OH• mediated hydroxylation/oxidation of model systems, ferric- or copper-reducing power, scavenging of nitrosating species. In addition, computational methods allowed researchers to determine the Bond Dissociation Enthalpy values of the OH groups of chalcogen modified phenolics and predict the best performing derivative. Finally, the activity of Se and Te containing compounds as mimic of glutathione peroxidase has been evaluated, together with other biological activities including anticancer action and (neuro)protective effects in various cellular models. These and other achievements are discussed and rationalized to guide future development in the field.
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Affiliation(s)
- Maria Laura Alfieri
- Department of Chemical Sciences, University of Naples “Federico II”, Via Cintia 21, I-80126 Naples, Italy; (M.L.A.); (L.P.)
| | - Lucia Panzella
- Department of Chemical Sciences, University of Naples “Federico II”, Via Cintia 21, I-80126 Naples, Italy; (M.L.A.); (L.P.)
| | - Riccardo Amorati
- Department of Chemistry “Giacomo Ciamician”, University of Bologna, Via S. Giacomo 11, I-40126 Bologna, Italy; (R.A.); (A.C.)
| | - Alice Cariola
- Department of Chemistry “Giacomo Ciamician”, University of Bologna, Via S. Giacomo 11, I-40126 Bologna, Italy; (R.A.); (A.C.)
| | - Luca Valgimigli
- Department of Chemistry “Giacomo Ciamician”, University of Bologna, Via S. Giacomo 11, I-40126 Bologna, Italy; (R.A.); (A.C.)
| | - Alessandra Napolitano
- Department of Chemical Sciences, University of Naples “Federico II”, Via Cintia 21, I-80126 Naples, Italy; (M.L.A.); (L.P.)
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Guo Y, Pizzol R, Gabbanini S, Baschieri A, Amorati R, Valgimigli L. Absolute Antioxidant Activity of Five Phenol-Rich Essential Oils. Molecules 2021; 26:molecules26175237. [PMID: 34500670 PMCID: PMC8434318 DOI: 10.3390/molecules26175237] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Revised: 08/24/2021] [Accepted: 08/25/2021] [Indexed: 12/29/2022] Open
Abstract
Essential oils (EOs) have promising antioxidant activities which are gaining interest as natural alternatives to synthetic antioxidants in the food and cosmetic industries. However, quantitative data on chain-breaking activity and on the kinetics of peroxyl radical trapping are missing. Five phenol-rich EOs were analyzed by GC-MS and studied by oxygen-uptake kinetics in inhibited controlled autoxidations of reference substrates (cumene and squalene). Terpene-rich Thymus vulgaris (thymol 4%; carvacrol 33.9%), Origanum vulgare, (thymol 0.4%; carvacrol 66.2%) and Satureja hortensis, (thymol 1.7%; carvacrol 46.6%), had apparent kinh (30 °C, PhCl) of (1.5 ± 0.3) × 104, (1.3 ± 0.1) × 104 and (1.1 ± 0.3) × 104 M−1s−1, respectively, while phenylpropanoid-rich Eugenia caryophyllus (eugenol 80.8%) and Cinnamomum zeylanicum, (eugenol 81.4%) showed apparent kinh (30 °C, PhCl) of (5.0 ± 0.1) × 103 and (4.9 ± 0.3) × 103 M−1s−1, respectively. All EOs already granted good antioxidant protection of cumene at a concentration of 1 ppm (1 mg/L), the duration being proportional to their phenolic content, which dictated their antioxidant behavior. They also afforded excellent protection of squalene after adjusting their concentration (100 mg/L) to account for the much higher oxidizability of this substrate. All investigated EOs had kinh comparable to synthetic butylated hydroxytoluene (BHT) were are eligible to replace it in the protection of food or cosmetic products.
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Affiliation(s)
- Yafang Guo
- Department of Chemistry “G. Ciamician”, University of Bologna, Via S. Giacomo 11, 40126 Bologna, Italy; (Y.G.); (R.P.); (R.A.)
| | - Romeo Pizzol
- Department of Chemistry “G. Ciamician”, University of Bologna, Via S. Giacomo 11, 40126 Bologna, Italy; (Y.G.); (R.P.); (R.A.)
| | - Simone Gabbanini
- Research & Development—BeC s.r.l., Via C. Monteverdi 49, 47122 Forlì, Italy;
| | - Andrea Baschieri
- The Institute of Organic Synthesis and Photoreactivity, Consiglio Nazionale delle Ricerche (CNR), Via P. Gobetti 101, 40129 Bologna, Italy;
| | - Riccardo Amorati
- Department of Chemistry “G. Ciamician”, University of Bologna, Via S. Giacomo 11, 40126 Bologna, Italy; (Y.G.); (R.P.); (R.A.)
| | - Luca Valgimigli
- Department of Chemistry “G. Ciamician”, University of Bologna, Via S. Giacomo 11, 40126 Bologna, Italy; (Y.G.); (R.P.); (R.A.)
- Correspondence: ; Tel.: +39-051-2095683
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13
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Amorati R, Valgimigli L, Baschieri A, Guo Y, Mollica F, Menichetti S, Lupi M, Viglianisi C. SET and HAT/PCET acid-mediated oxidation processes in helical shaped fused bis-phenothiazines. Chemphyschem 2021; 22:1446-1454. [PMID: 34033195 PMCID: PMC8361695 DOI: 10.1002/cphc.202100387] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Indexed: 12/21/2022]
Abstract
Helical shaped fused bis-phenothiazines 1-9 have been prepared and their red-ox behaviour quantitatively studied. Helicene radical cations (Hel.+ ) can be obtained either by UV-irradiation in the presence of PhCl or by chemical oxidation. The latter process is extremely sensitive to the presence of acids in the medium with molecular oxygen becoming a good single electron transfer (SET) oxidant. The reaction of hydroxy substituted helicenes 5-9 with peroxyl radicals (ROO. ) occurs with a 'classical' HAT process giving HelO. radicals with kinetics depending upon the substitution pattern of the aromatic rings. In the presence of acetic acid, a fast medium-promoted proton-coupled electron transfer (PCET) process takes place with formation of HelO. radicals possibly also via a helicene radical cation intermediate. Remarkably, also helicenes 1-4, lacking phenoxyl groups, in the presence of acetic acid react with peroxyl radicals through a medium-promoted PCET mechanism with formation of the radical cations Hel.+ . Along with the synthesis, EPR studies of radicals and radical cations, BDE of Hel-OH group (BDEOH ), and kinetic constants (kinh ) of the reactions with ROO. species of helicenes 1-9 have been measured and calculated to afford a complete rationalization of the redox behaviour of these appealing chiral compounds.
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Affiliation(s)
- Riccardo Amorati
- Department of Chemistry “G. Ciamician”University of BolognaVia S. Giacomo 1140126BolognaItaly
| | - Luca Valgimigli
- Department of Chemistry “G. Ciamician”University of BolognaVia S. Giacomo 1140126BolognaItaly
| | - Andrea Baschieri
- Department of Chemistry “G. Ciamician”University of BolognaVia S. Giacomo 1140126BolognaItaly
| | - Yafang Guo
- Department of Chemistry “G. Ciamician”University of BolognaVia S. Giacomo 1140126BolognaItaly
| | - Fabio Mollica
- Department of Chemistry “G. Ciamician”University of BolognaVia S. Giacomo 1140126BolognaItaly
| | - Stefano Menichetti
- Department of Chemistry “U. Schiff”University of FlorenceVia Della Lastruccia 3–13, Sesto Fiorentino50019FirenzeItaly
| | - Michela Lupi
- Department of Chemistry “U. Schiff”University of FlorenceVia Della Lastruccia 3–13, Sesto Fiorentino50019FirenzeItaly
| | - Caterina Viglianisi
- Department of Chemistry “U. Schiff”University of FlorenceVia Della Lastruccia 3–13, Sesto Fiorentino50019FirenzeItaly
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14
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Guo Y, Baschieri A, Amorati R, Valgimigli L. Synergic antioxidant activity of γ-terpinene with phenols and polyphenols enabled by hydroperoxyl radicals. Food Chem 2020; 345:128468. [PMID: 33341300 DOI: 10.1016/j.foodchem.2020.128468] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 10/16/2020] [Accepted: 10/20/2020] [Indexed: 01/09/2023]
Abstract
Antioxidant interactions of γ-terpinene with α-tocopherol mimic 2,2,5,7,8-pentamethyl-6-chromanol (PMHC) and caffeic acid phenethyl ester (CAPE), used as models, respectively, of mono- and poly-phenols were demonstrated by differential oximetry during the inhibited autoxidation of model substrates: stripped sunflower oil, squalene, and styrene. With all substrates, γ-terpinene acts synergistically regenerating the chain-breaking antioxidants PMHC and CAPE from their radicals, via the formation of hydroperoxyl radicals. The inhibition duration for mixtures PMHC/γ-terpinene and CAPE/γ-terpinene increased with γ-terpinene concentration, while rate constants for radical-trapping were unchanged by γ-terpinene, being 3.1 × 106 and 4.8 × 105 M-1s-1 for PMHC and CAPE in chlorobenzene (30 °C). Using 3,5-di-tert-butylcatechol and 3,5-di-tert-butyl-1,2-bezoquinone we demonstrate that γ-terpinene can reduce quinones to catechols enabling their antioxidant activity. The different synergy mechanism of γ-terpinene with mono- and poly-phenolic antioxidants is discussed and its relevance is proven in homogenous lipids using natural α-tocopherol and hydroxytyrosol as antioxidants, calling for further studies in heterogenous food products.
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Affiliation(s)
- Yafang Guo
- University of Bologna, Department of Chemistry "G. Ciamician", Via S. Giacomo 11, 40126 Bologna, Italy
| | - Andrea Baschieri
- University of Bologna, Department of Chemistry "G. Ciamician", Via S. Giacomo 11, 40126 Bologna, Italy
| | - Riccardo Amorati
- University of Bologna, Department of Chemistry "G. Ciamician", Via S. Giacomo 11, 40126 Bologna, Italy
| | - Luca Valgimigli
- University of Bologna, Department of Chemistry "G. Ciamician", Via S. Giacomo 11, 40126 Bologna, Italy.
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15
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Upadhyay A, Batabyal M, Kanika, Kumar S. Organoseleniums: Generated and Exploited in Oxidative Reactions. CHEM LETT 2020. [DOI: 10.1246/cl.200015] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Aditya Upadhyay
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal By-pass Road, Bhauri, Bhopal 462066, Madhya Pradesh India
| | - Monojit Batabyal
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal By-pass Road, Bhauri, Bhopal 462066, Madhya Pradesh India
| | - Kanika
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal By-pass Road, Bhauri, Bhopal 462066, Madhya Pradesh India
| | - Sangit Kumar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal By-pass Road, Bhauri, Bhopal 462066, Madhya Pradesh India
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16
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Viglianisi C, Menichetti S. Chain Breaking Antioxidant Activity of Heavy (S, Se, Te) Chalcogens Substituted Polyphenols. Antioxidants (Basel) 2019; 8:antiox8100487. [PMID: 31623080 PMCID: PMC6826409 DOI: 10.3390/antiox8100487] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 10/12/2019] [Accepted: 10/15/2019] [Indexed: 12/13/2022] Open
Abstract
Polyphenols are probably the most important family of natural and synthetic chain-breaking antioxidants. Since long ago, chemists have studied how structural (bioinspired) modifications can improve the antioxidant activity of these compounds in terms of reaction rate with radical reactive oxygen species (ROS), catalytic character, multi-defence action, hydrophilicity/lipophilicity, biodistribution etc. In this framework, we will discuss the effect played on the overall antioxidant profile by the insertion of heavy chalcogens (S, Se and Te) in the phenolic skeleton.
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Affiliation(s)
- Caterina Viglianisi
- Department of Chemistry "Ugo Schiff", University of Florence, Via Della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
| | - Stefano Menichetti
- Department of Chemistry "Ugo Schiff", University of Florence, Via Della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
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17
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Abstract
The rationale and scope of the main issues of antioxidant measurement are presented, with basic definitions and terms in antioxidant research (such as reactive species and related antioxidative defenses, oxidative stress, and antioxidant activity and capacity) in a historical background. An overview of technical problems and expectations is given in terms of interpretation of results, precision and comparability of methods, capability of simulating physical reality, and analytical performance (sensitivity, selectivity, etc.). Current analytical methods for measuring antioxidant and antiradical activity are classified from various viewpoints. Reaction kinetics and thermodynamics of current analytical methods are discussed, describing physicochemical aspects of antioxidant action and measurement. Controversies and limitations of the widely used antioxidant assays are elaborated in detail. Emerging techniques in antioxidant testing (e.g., nanotechnology, sensors, electrochemistry, chemometry, and hyphenated methods) are broadly introduced. Finally, hints for the selection of suitable assays (i.e., preferable for a specific purpose) and future prospects are given.
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Affiliation(s)
- Reşat Apak
- Department of Chemistry, Faculty of Engineering , Istanbul University-Cerrahpasa , Avcilar, 34320 Istanbul , Turkey
- Turkish Academy of Sciences (TUBA) , Piyade Street 27 , Cankaya, 06690 Ankara , Turkey
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18
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Viglianisi C, Vasa K, Tanini D, Capperucci A, Amorati R, Valgimigli L, Baschieri A, Menichetti S. Ditocopheryl Sulfides and Disulfides: Synthesis and Antioxidant Profile. Chemistry 2019; 25:9108-9116. [PMID: 31017702 DOI: 10.1002/chem.201901537] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Indexed: 12/14/2022]
Abstract
Symmetrical ditocopheryl disulfides (Toc)2 S2 and symmetrical and unsymmetrical ditocopheryl sulfides (Toc)2 S were simply prepared under remarkably mild conditions with complete control of the regiochemistry by using δ-, γ-, and β-tocopheryl-N-thiophthalimides (Toc-NSPht) as common starting materials. The roles of sulfur atom(s), H-bond and aryl ring substitution pattern on the antioxidant profile of these new compounds, which were assembled by linking together two tocopheryl units, are also discussed.
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Affiliation(s)
- Caterina Viglianisi
- Department of Chemistry "Ugo Schiff", University of Florence, Via Della Lastruccia 3-13, Sesto Fiorentino, Firenze, Italy
| | - Kristian Vasa
- Department of Chemistry "Ugo Schiff", University of Florence, Via Della Lastruccia 3-13, Sesto Fiorentino, Firenze, Italy
| | - Damiano Tanini
- Department of Chemistry "Ugo Schiff", University of Florence, Via Della Lastruccia 3-13, Sesto Fiorentino, Firenze, Italy
| | - Antonella Capperucci
- Department of Chemistry "Ugo Schiff", University of Florence, Via Della Lastruccia 3-13, Sesto Fiorentino, Firenze, Italy
| | - Riccardo Amorati
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy
| | - Luca Valgimigli
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy
| | - Andrea Baschieri
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy
| | - Stefano Menichetti
- Department of Chemistry "Ugo Schiff", University of Florence, Via Della Lastruccia 3-13, Sesto Fiorentino, Firenze, Italy
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19
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One-stage synthesis of 4-[(dodecylselanyl)methyl]-2,6-dimethylphenol based on the tandem reaction between 2,6-dimethylphenol, formaldehyde, and dodecaneselenol. Russ Chem Bull 2019. [DOI: 10.1007/s11172-019-2530-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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20
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Amorati R, Baschieri A, Valgimigli L. The role of sulfur and heavier chalcogens in the chemistry of antioxidants. PHOSPHORUS SULFUR 2019. [DOI: 10.1080/10426507.2019.1602620] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Riccardo Amorati
- Department of Chemistry “G. Ciamician”, University of Bologna, Bologna, Italy
| | - Andrea Baschieri
- Department of Chemistry “G. Ciamician”, University of Bologna, Bologna, Italy
| | - Luca Valgimigli
- Department of Chemistry “G. Ciamician”, University of Bologna, Bologna, Italy
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21
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Yang T, Xiao P, Zhang J, Jia R, Nawaz H, Chen Z, Zhang J. Multifunctional Cellulose Ester Containing Hindered Phenol Groups with Free-Radical-Scavenging and UV-Resistant Activities. ACS APPLIED MATERIALS & INTERFACES 2019; 11:4302-4310. [PMID: 30411874 DOI: 10.1021/acsami.8b15642] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Excessive radicals and UV irradiation can trigger oxidative and physiological stresses, which cause tissue aging, human disease, food spoilage, and material degradation. In this study, a multifunctional cellulose ester containing hindered phenol groups, cellulose 3,5-di- tert-butyl-4-hydroxybenzoate (CBH), with free-radical-scavenging and UV-resistant activities was synthesized and used as a functional material. The obtained CBHs can effectively scavenge reactive nitrogen free radicals and hydroxyl free radicals in both solid and solution states. Moreover, CBHs have no cytotoxicity, and, on the contrary, they promote the proliferation of human epidermal keratinocytes. Benefiting from excellent solubility, processability, and formability, CBHs have been readily processed into flexible films, transparent coatings, and nanoribbons membranes. The highly transparent and flexible CBH film completely absorbs the light of 200-300 nm range and partially absorbs the light of 300-400 nm range, indicating a UV-shielding capability. After the CBHs were loaded on an ordinary facial mask by electrospinning or added into a hand cream, the resultant facial mask and hand cream exhibited outstanding free-radical-scavenging properties. In addition, CBHs can also be used to fabricate functional sprays with antioxidative and UV-shielding activities. Accordingly, the obtained CBHs have a huge potential in cosmetics, personal care products, biopharmaceuticals, papermaking, and art protection because of their excellent antioxidation, nontoxicity, UV resistance, formability, and odorless properties.
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Affiliation(s)
- Tiantian Yang
- CAS Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (CAS) , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Peng Xiao
- CAS Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (CAS) , Beijing 100190 , China
| | - Jinming Zhang
- CAS Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (CAS) , Beijing 100190 , China
| | - Ruonan Jia
- CAS Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (CAS) , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Haq Nawaz
- CAS Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (CAS) , Beijing 100190 , China
| | - Zhangyan Chen
- CAS Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (CAS) , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Jun Zhang
- CAS Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (CAS) , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
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22
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5-Hydroxy-2,3-dihydrobenzofuran-derived polyfunctional antioxidants 3. Synthesis and antioxidant activity of 2-dodecylthiomethyland 2-dodecylselenomethyl-5-hydroxy-4,6,7-trimethyl-2,3-dihydrobenzofurans. Russ Chem Bull 2018. [DOI: 10.1007/s11172-018-2239-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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23
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Sands KN, Tuck TA, Back TG. Cyclic Seleninate Esters, Spirodioxyselenuranes and Related Compounds: New Classes of Biological Antioxidants That Emulate Glutathione Peroxidase. Chemistry 2018. [DOI: 10.1002/chem.201800182] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Kai N. Sands
- Department of Chemistry; University of Calgary; 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
| | - Tyler A. Tuck
- Department of Chemistry; University of Calgary; 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
| | - Thomas G. Back
- Department of Chemistry; University of Calgary; 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
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24
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Amorati R, Valgimigli L. Methods To Measure the Antioxidant Activity of Phytochemicals and Plant Extracts. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:3324-3329. [PMID: 29557653 DOI: 10.1021/acs.jafc.8b01079] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Measurement of antioxidant properties in plant-derived compounds requires appropriate methods that address the mechanism of antioxidant activity and focus on the kinetics of the reactions involving the antioxidants. Methods based on inhibited autoxidations are the most suited for chain-breaking antioxidants and for termination-enhancing antioxidants, while different specific studies are needed for preventive antioxidants. A selection of chemical testing methods is critically reviewed, highlighting their advantages and limitations and discussing their usefulness to investigate both pure molecules and raw extracts. The influence of the reaction medium on antioxidants' performance is also addressed.
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Affiliation(s)
- Riccardo Amorati
- University of Bologna , Department of Chemistry "G. Ciamician" , Via S. Giacomo 11 , 40126 Bologna , Italy
| | - Luca Valgimigli
- University of Bologna , Department of Chemistry "G. Ciamician" , Via S. Giacomo 11 , 40126 Bologna , Italy
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25
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Poon JF, Yan J, Jorner K, Ottosson H, Donau C, Singh VP, Gates PJ, Engman L. Substituent Effects in Chain-Breaking Aryltellurophenol Antioxidants. Chemistry 2018; 24:3520-3527. [DOI: 10.1002/chem.201704811] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Indexed: 12/28/2022]
Affiliation(s)
- Jia-fei Poon
- Department of Chemistry, Biomedicinskt Centrum (BMC); Uppsala University, Box-576; 751 23 Uppsala Sweden
| | - Jiajie Yan
- Department of Chemistry, Biomedicinskt Centrum (BMC); Uppsala University, Box-576; 751 23 Uppsala Sweden
| | - Kjell Jorner
- Department of Chemistry, Ångström Laboratory; Uppsala University, Box-523; 751 20 Uppsala Sweden
| | - Henrik Ottosson
- Department of Chemistry, Ångström Laboratory; Uppsala University, Box-523; 751 20 Uppsala Sweden
| | - Carsten Donau
- Department of Chemistry, Biomedicinskt Centrum (BMC); Uppsala University, Box-576; 751 23 Uppsala Sweden
| | - Vijay P. Singh
- Department of Chemistry & Centre of Advanced Studies in Chemistry; Panjab University; Chandigarh 160 014 India
| | - Paul J. Gates
- School of Chemistry; University of Bristol; Bristol BS8 1TS UK
| | - Lars Engman
- Department of Chemistry, Biomedicinskt Centrum (BMC); Uppsala University, Box-576; 751 23 Uppsala Sweden
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26
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Yu S, Liu S. Multifunctional Antioxidants with High Activity at Elevated Temperatures Based on Intramolecular Synergism. European J Org Chem 2018. [DOI: 10.1002/ejoc.201701577] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Shasha Yu
- Polymers and Composites Division; Ningbo Institute of Materials Technology and Engineering; Chinese Academy of Sciences; No. 1219 Zhongguan West Road 315201 Ningbo China
| | - Shenggao Liu
- Polymers and Composites Division; Ningbo Institute of Materials Technology and Engineering; Chinese Academy of Sciences; No. 1219 Zhongguan West Road 315201 Ningbo China
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27
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Singh VP, Yan J, Poon JF, Gates PJ, Butcher RJ, Engman L. Chain-Breaking Phenolic 2,3-Dihydrobenzo[b]selenophene Antioxidants: Proximity Effects and Regeneration Studies. Chemistry 2017; 23:15080-15088. [PMID: 28857289 DOI: 10.1002/chem.201702350] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Indexed: 11/07/2022]
Abstract
Phenolic 2,3-dihydrobenzo[b]selenophene antioxidants bearing an OH-group ortho (9), meta (10, 11) and para (8) to the Se were prepared by seleno-Claisen rearrangement/intramolecular hydroselenation. meta-Isomer (11) was studied by X-ray crystallography. The radical-trapping activity and regenerability of compounds 8-11 were evaluated using a two-phase system in which linoleic acid was undergoing peroxidation in the lipid phase while regeneration of the antioxidant by co-antioxidants (N-acetylcysteine, glutathione, dithiothreitol, ascorbic acid, tris(carboxyethyl)phosphine hydrochloride) was ongoing in the aqueous layer. Compound 9 quenched peroxyl radicals more efficiently than α-tocopherol. It also provided the most long-lasting antioxidant protection. With thiol co-antioxidants it could inhibit peroxidation for more than five-fold longer than the natural product. Regeneration was more efficient when the aqueous phase pH was slightly acidic. Since calculated O-H bond dissociation energies for 8-11 were substantially larger than for α-tocopherol, an antioxidant mechanism involving O-atom transfer from peroxyl to selenium was proposed. The resulting phenolic selenoxide/alkoxyl radical would then exchange a hydrogen atom in a solvent cage before antioxidant regeneration at the aqueous lipid interphase.
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Affiliation(s)
- Vijay P Singh
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Chandigarh -, 160 014, India
- Department of Chemistry-BMC, Uppsala University, Box-576, 751 23, Uppsala, Sweden
| | - Jiajie Yan
- Department of Chemistry-BMC, Uppsala University, Box-576, 751 23, Uppsala, Sweden
| | - Jia-Fei Poon
- Department of Chemistry-BMC, Uppsala University, Box-576, 751 23, Uppsala, Sweden
| | | | - Ray J Butcher
- Department of Chemistry, Howard University, Washington, DC, 20059, USA
| | - Lars Engman
- Department of Chemistry-BMC, Uppsala University, Box-576, 751 23, Uppsala, Sweden
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28
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Denisova TG, Denisov ET. Dissociation energies of O–H bonds in alkylseleno- and alkyltelluro-substituted phenols. KINETICS AND CATALYSIS 2017. [DOI: 10.1134/s0023158417010013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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29
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Prasad CD, Sattar M, Kumar S. Transition-Metal-Free Selective Oxidative C(sp3)–S/Se Coupling of Oxindoles, Tetralone, and Arylacetamides: Synthesis of Unsymmetrical Organochalcogenides. Org Lett 2017; 19:774-777. [DOI: 10.1021/acs.orglett.6b03735] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Ch. Durga Prasad
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP 462 066, India
| | - Moh. Sattar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP 462 066, India
| | - Sangit Kumar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP 462 066, India
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30
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McNeil NMR, Press DJ, Mayder DM, Garnica P, Doyle LM, Back TG. Enhanced Glutathione Peroxidase Activity of Water-Soluble and Polyethylene Glycol-Supported Selenides, Related Spirodioxyselenuranes, and Pincer Selenuranes. J Org Chem 2016; 81:7884-97. [DOI: 10.1021/acs.joc.6b01593] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Nicole M. R. McNeil
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
| | - David J. Press
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
| | - Don M. Mayder
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
| | - Pablo Garnica
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
| | - Lisa M. Doyle
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
| | - Thomas G. Back
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
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31
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Poon JF, Yan J, Singh VP, Gates PJ, Engman L. Alkyltelluro Substitution Improves the Radical-Trapping Capacity of Aromatic Amines. Chemistry 2016; 22:12891-903. [DOI: 10.1002/chem.201602377] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Indexed: 01/14/2023]
Affiliation(s)
- Jia-fei Poon
- Department of Chemistry-BMC; Uppsala University, Box-576; 751 23 Uppsala Sweden
| | - Jiajie Yan
- Department of Chemistry-BMC; Uppsala University, Box-576; 751 23 Uppsala Sweden
| | - Vijay P. Singh
- Department of Chemistry-BMC; Uppsala University, Box-576; 751 23 Uppsala Sweden
| | - Paul J. Gates
- University of Bristol; School of Chemistry; Bristol BS8 1TS UK
| | - Lars Engman
- Department of Chemistry-BMC; Uppsala University, Box-576; 751 23 Uppsala Sweden
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32
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Direct chemical grafted curcumin on halloysite nanotubes as dual-responsive prodrug for pharmacological applications. Colloids Surf B Biointerfaces 2016; 140:505-513. [DOI: 10.1016/j.colsurfb.2016.01.025] [Citation(s) in RCA: 123] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 01/08/2016] [Accepted: 01/14/2016] [Indexed: 01/23/2023]
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33
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Boosting effect of ortho- propenyl substituent on the antioxidant activity of natural phenols. Food Chem 2016; 196:418-27. [DOI: 10.1016/j.foodchem.2015.09.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Revised: 08/05/2015] [Accepted: 09/04/2015] [Indexed: 11/22/2022]
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34
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Kumar S, Yan J, Poon JF, Singh VP, Lu X, Karlsson Ott M, Engman L, Kumar S. Multifunctional Antioxidants: Regenerable Radical-Trapping and Hydroperoxide-Decomposing Ebselenols. Angew Chem Int Ed Engl 2016; 55:3729-33. [DOI: 10.1002/anie.201510947] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 01/11/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Shailesh Kumar
- Department of Chemistry; Indian Institute of Science Education and Research (IISER); Bhopal- 462066 India
| | - Jiajie Yan
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Jia-fei Poon
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Vijay P. Singh
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Xi Lu
- Division of Applied Materials Science; Department of Engineering Sciences; Uppsala University; Sweden
| | - Marjam Karlsson Ott
- Division of Applied Materials Science; Department of Engineering Sciences; Uppsala University; Sweden
| | - Lars Engman
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Sangit Kumar
- Department of Chemistry; Indian Institute of Science Education and Research (IISER); Bhopal- 462066 India
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35
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Kumar S, Yan J, Poon JF, Singh VP, Lu X, Karlsson Ott M, Engman L, Kumar S. Multifunctional Antioxidants: Regenerable Radical-Trapping and Hydroperoxide-Decomposing Ebselenols. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201510947] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Shailesh Kumar
- Department of Chemistry; Indian Institute of Science Education and Research (IISER); Bhopal- 462066 India
| | - Jiajie Yan
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Jia-fei Poon
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Vijay P. Singh
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Xi Lu
- Division of Applied Materials Science; Department of Engineering Sciences; Uppsala University; Sweden
| | - Marjam Karlsson Ott
- Division of Applied Materials Science; Department of Engineering Sciences; Uppsala University; Sweden
| | - Lars Engman
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Sangit Kumar
- Department of Chemistry; Indian Institute of Science Education and Research (IISER); Bhopal- 462066 India
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36
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Yan J, Poon JF, Singh VP, Gates P, Engman L. Regenerable Thiophenolic Radical-Trapping Antioxidants. Org Lett 2015; 17:6162-5. [PMID: 26651856 DOI: 10.1021/acs.orglett.5b03169] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diphenyl disulfides carrying alkyltelluro groups in the o-, m-, and p-positions were prepared using ortho-lithiation and lithium halogen exchange reactions. The novel antioxidants showed only minimal inhibitory effect on the azo-initiated peroxidation of linoleic acid in chlorobenzene until reduced to the corresponding thiophenols by tris(2-carboxyethyl)phosphine (TCEP). The best in situ generated thiophenol (from 7c) under these conditions quenched peroxyl radicals more efficiently than α-tocopherol with an almost 3-fold increase in inhibition time.
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Affiliation(s)
- Jiajie Yan
- Uppsala University , Department of Chemistry - BMC, Box 576, SE-751 23 Uppsala, Sweden
| | - Jia-fei Poon
- Uppsala University , Department of Chemistry - BMC, Box 576, SE-751 23 Uppsala, Sweden
| | - Vijay P Singh
- Uppsala University , Department of Chemistry - BMC, Box 576, SE-751 23 Uppsala, Sweden
| | - Paul Gates
- University of Bristol , School of Chemistry, Bristol, BS8 1TS, United Kingdom
| | - Lars Engman
- Uppsala University , Department of Chemistry - BMC, Box 576, SE-751 23 Uppsala, Sweden
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37
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Viglianisi C, Amorati R, Di Pietro L, Menichetti S. A Straightforward Route to Potent Phenolic Chain-Breaking Antioxidants by Acid-Promoted Transposition of 1,4-Benzo[b]oxathiines to Dihydrobenzo[b]thiophenes. Chemistry 2015; 21:16639-45. [PMID: 26440303 DOI: 10.1002/chem.201502650] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Indexed: 12/25/2022]
Abstract
The transformation of simple phenols with limited antioxidant activity into potent chain-breaking antioxidants was achieved by a three-step protocol, consisting of the conversion of phenols into 1,4-benzo[b]oxathiines followed by an unprecedented acid-promoted transposition to o-hydroxydihydrobenzo[b]thiophenes, or dihydrobenzo[de]thiochromenes, starting from phenols or naphthols, respectively. These derivatives, bearing a benzo-fused heterocycle with a sulfide sulfur ortho to the phenolic OH, have a rate constant of reaction with alkylperoxyl radicals (kinh ) comparable to that of α-tocopherol. A solid rationale for the transposition mechanism as well as for the structure-antioxidant activity relationship is presented.
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Affiliation(s)
- Caterina Viglianisi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Firenze (Italy).
| | - Riccardo Amorati
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126 Bologna (Italy)
| | - Leonardo Di Pietro
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Firenze (Italy)
| | - Stefano Menichetti
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Firenze (Italy).
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38
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Prasad CD, Verma A, Sattar M, Kumar S. Silver-mediated thio-acetoxylation and TFA triggered cyclization of amino disulfides with unactivated alkenes: synthesis of 3-aryl/alkyl-1,4-benzothiazines. RSC Adv 2015. [DOI: 10.1039/c5ra12995h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A protocol for the synthesis of 3-aryl/alkyl-1,4-benzothiazines has been developed, which involves silver-mediated 1,2-thioacetoxylation of an alkene followed by cyclization using TFA.
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Affiliation(s)
- Ch. Durga Prasad
- Department of Chemistry
- Indian Institute of Science Education and Research (IISER) Bhopal
- Bhopal
- India-462066
| | - Ajay Verma
- Department of Chemistry
- Indian Institute of Science Education and Research (IISER) Bhopal
- Bhopal
- India-462066
| | - Moh. Sattar
- Department of Chemistry
- Indian Institute of Science Education and Research (IISER) Bhopal
- Bhopal
- India-462066
| | - Sangit Kumar
- Department of Chemistry
- Indian Institute of Science Education and Research (IISER) Bhopal
- Bhopal
- India-462066
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39
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Tanini D, Panzella L, Amorati R, Capperucci A, Pizzo E, Napolitano A, Menichetti S, d'Ischia M. Resveratrol-based benzoselenophenes with an enhanced antioxidant and chain breaking capacity. Org Biomol Chem 2015; 13:5757-64. [DOI: 10.1039/c5ob00193e] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
One-pot selenenylation of resveratrol with Se(0) and SO2Cl2 leads to benzoselenophene derivatives with efficient Trolox-like antioxidant and chain breaking capacity.
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Affiliation(s)
- Damiano Tanini
- Department of Chemistry “Ugo Schiff”
- University of Florence
- I-50019 Sesto Fiorentino
- Italy
| | - Lucia Panzella
- Department of Chemical Sciences
- University of Naples “Federico II”
- I-80126 Naples
- Italy
| | - Riccardo Amorati
- Department of Chemistry “G. Ciamician”
- University of Bologna
- I-40126 Bologna
- Italy
| | - Antonella Capperucci
- Department of Chemistry “Ugo Schiff”
- University of Florence
- I-50019 Sesto Fiorentino
- Italy
| | - Elio Pizzo
- Department of Biology
- University of Naples “Federico II”
- I-80126 Naples
- Italy
| | - Alessandra Napolitano
- Department of Chemical Sciences
- University of Naples “Federico II”
- I-80126 Naples
- Italy
| | - Stefano Menichetti
- Department of Chemistry “Ugo Schiff”
- University of Florence
- I-50019 Sesto Fiorentino
- Italy
| | - Marco d'Ischia
- Department of Chemical Sciences
- University of Naples “Federico II”
- I-80126 Naples
- Italy
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40
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Poon JF, Singh VP, Yan J, Engman L. Regenerable Antioxidants-Introduction of Chalcogen Substituents into Tocopherols. Chemistry 2014; 21:2447-57. [DOI: 10.1002/chem.201405895] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Indexed: 12/13/2022]
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41
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Ingold KU, Pratt DA. Advances in radical-trapping antioxidant chemistry in the 21st century: a kinetics and mechanisms perspective. Chem Rev 2014; 114:9022-46. [PMID: 25180889 DOI: 10.1021/cr500226n] [Citation(s) in RCA: 320] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Keith U Ingold
- National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada
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42
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Ohkawara T, Suzuki K, Nakano K, Mori S, Nozaki K. Facile Estimation of Catalytic Activity and Selectivities in Copolymerization of Propylene Oxide with Carbon Dioxide Mediated by Metal Complexes with Planar Tetradentate Ligand. J Am Chem Soc 2014; 136:10728-35. [DOI: 10.1021/ja5046814] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takahiro Ohkawara
- Department
of Chemistry and Biotechnology, Graduate School of Engineering, the University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kohei Suzuki
- Department
of Chemistry and Biotechnology, Graduate School of Engineering, the University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Koji Nakano
- Department
of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Seiji Mori
- Faculty
of Science, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
| | - Kyoko Nozaki
- Department
of Chemistry and Biotechnology, Graduate School of Engineering, the University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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43
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Mazzonna M, Bietti M, DiLabio GA, Lanzalunga O, Salamone M. Importance of π-Stacking Interactions in the Hydrogen Atom Transfer Reactions from Activated Phenols to Short-Lived N-Oxyl Radicals. J Org Chem 2014; 79:5209-18. [DOI: 10.1021/jo500789v] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Marco Mazzonna
- Dipartimento
di Chimica and Istituto CNR di Metodologie
Chimiche (IMC−CNR), Sezione Meccanismi di Reazione, c/o Dipartimento
di Chimica, Sapienza Università di Roma, P.le A. Moro, 5, I-00185 Rome, Italy
| | - Massimo Bietti
- Dipartimento
di Scienze e Tecnologie Chimiche, Università “Tor Vergata”, Via della Ricerca Scientifica, 1, I-00133 Rome, Italy
| | - Gino A. DiLabio
- National
Institute for Nanotechnology, National Research Council of Canada, 11421
Saskatchewan Drive, Edmonton, Alberta, Canada T6G 2M9
- Department
of Chemistry, University of British Columbia, Okanagan, 3333 University
Way, Kelowna, British Columbia, Canada V1V 1V7
| | - Osvaldo Lanzalunga
- Dipartimento
di Chimica and Istituto CNR di Metodologie
Chimiche (IMC−CNR), Sezione Meccanismi di Reazione, c/o Dipartimento
di Chimica, Sapienza Università di Roma, P.le A. Moro, 5, I-00185 Rome, Italy
| | - Michela Salamone
- Dipartimento
di Scienze e Tecnologie Chimiche, Università “Tor Vergata”, Via della Ricerca Scientifica, 1, I-00133 Rome, Italy
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44
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McNeil NMR, Matz MC, Back TG. Fluxional Cyclic Seleninate Ester: NMR and Computational Studies, Glutathione Peroxidase-like Behavior, and Unexpected Rearrangement. J Org Chem 2013; 78:10369-82. [DOI: 10.1021/jo401757m] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Nicole M. R. McNeil
- Department of Chemistry, University of Calgary, Calgary, Alberta, Canada T2N 1N4
| | - Marie C. Matz
- Department of Chemistry, University of Calgary, Calgary, Alberta, Canada T2N 1N4
| | - Thomas G. Back
- Department of Chemistry, University of Calgary, Calgary, Alberta, Canada T2N 1N4
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45
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Amorati R, Valgimigli L, Panzella L, Napolitano A, d’Ischia M. 5-S-Lipoylhydroxytyrosol, a Multidefense Antioxidant Featuring a Solvent-Tunable Peroxyl Radical-Scavenging 3-Thio-1,2-dihydroxybenzene Motif. J Org Chem 2013; 78:9857-64. [DOI: 10.1021/jo401522q] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Riccardo Amorati
- Department
of Chemistry “G. Ciamician”, University of Bologna, Via S. Giacomo 11, I-40126 Bologna, Italy
| | - Luca Valgimigli
- Department
of Chemistry “G. Ciamician”, University of Bologna, Via S. Giacomo 11, I-40126 Bologna, Italy
| | - Lucia Panzella
- Department
of Chemical Sciences, University of Naples “Federico II”, Via Cintia 4, I-80126, Naples, Italy
| | - Alessandra Napolitano
- Department
of Chemical Sciences, University of Naples “Federico II”, Via Cintia 4, I-80126, Naples, Italy
| | - Marco d’Ischia
- Department
of Chemical Sciences, University of Naples “Federico II”, Via Cintia 4, I-80126, Naples, Italy
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46
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Poon JF, Singh VP, Engman L. In Search of Catalytic Antioxidants—(Alkyltelluro)phenols, (Alkyltelluro)resorcinols, and Bis(alkyltelluro)phenols. J Org Chem 2013; 78:6008-15. [DOI: 10.1021/jo400703w] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jia-fei Poon
- Uppsala University, Department of Chemistry, BMC, Box 576, SE-751 23 Uppsala,
Sweden
| | - Vijay P. Singh
- Uppsala University, Department of Chemistry, BMC, Box 576, SE-751 23 Uppsala,
Sweden
| | - Lars Engman
- Uppsala University, Department of Chemistry, BMC, Box 576, SE-751 23 Uppsala,
Sweden
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47
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Amorati R, Valgimigli L, Dinér P, Bakhtiari K, Saeedi M, Engman L. Multi-faceted Reactivity of Alkyltellurophenols Towards Peroxyl Radicals: Catalytic Antioxidant Versus Thiol-Depletion Effect. Chemistry 2013; 19:7510-22. [DOI: 10.1002/chem.201300451] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Indexed: 11/08/2022]
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48
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Singh VP, Poon JF, Engman L. Turning Pyridoxine into a Catalytic Chain-Breaking and Hydroperoxide-Decomposing Antioxidant. J Org Chem 2013; 78:1478-87. [DOI: 10.1021/jo3024297] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Vijay P. Singh
- Department of Chemistry−BMC, Uppsala University, Box 576, SE-751 23 Uppsala, Sweden
| | - Jia-fei Poon
- Department of Chemistry−BMC, Uppsala University, Box 576, SE-751 23 Uppsala, Sweden
| | - Lars Engman
- Department of Chemistry−BMC, Uppsala University, Box 576, SE-751 23 Uppsala, Sweden
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49
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Prasad CD, Balkrishna SJ, Kumar A, Bhakuni BS, Shrimali K, Biswas S, Kumar S. Transition-Metal-Free Synthesis of Unsymmetrical Diaryl Chalcogenides from Arenes and Diaryl Dichalcogenides. J Org Chem 2013; 78:1434-43. [DOI: 10.1021/jo302480j] [Citation(s) in RCA: 154] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Ch Durga Prasad
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP
462 023, India
| | - Shah Jaimin Balkrishna
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP
462 023, India
| | - Amit Kumar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP
462 023, India
| | - Bhagat Singh Bhakuni
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP
462 023, India
| | - Kaustubh Shrimali
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP
462 023, India
| | - Soumava Biswas
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP
462 023, India
| | - Sangit Kumar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP
462 023, India
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50
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D’Alfonso C, Bietti M, DiLabio GA, Lanzalunga O, Salamone M. Reactions of the Phthalimide N-Oxyl Radical (PINO) with Activated Phenols: The Contribution of π-Stacking Interactions to Hydrogen Atom Transfer Rates. J Org Chem 2013; 78:1026-37. [DOI: 10.1021/jo302483s] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Claudio D’Alfonso
- Dipartimento di Chimica, Sapienza
Università di Roma and Istituto CNR di Metodologie Chimiche
(IMC−CNR), Sezione Meccanismi di Reazione, c/o Dipartimento
di Chimica, Sapienza Università di Roma, P.le A. Moro, 5 I-00185 Rome, Italy
| | - Massimo Bietti
- Dipartimento di Scienze e Tecnologie
Chimiche, Università ″Tor Vergata″, Via della Ricerca Scientifica, 1 I-00133 Rome, Italy
| | - Gino A. DiLabio
- National Institute for Nanotechnology, National Research Council of Canada, 11421 Saskatchewan
Drive, Edmonton, Alberta, Canada T6G 2M9
- Department of Physics, University of Alberta, Edmonton, Alberta, Canada
| | - Osvaldo Lanzalunga
- Dipartimento di Chimica, Sapienza
Università di Roma and Istituto CNR di Metodologie Chimiche
(IMC−CNR), Sezione Meccanismi di Reazione, c/o Dipartimento
di Chimica, Sapienza Università di Roma, P.le A. Moro, 5 I-00185 Rome, Italy
| | - Michela Salamone
- Dipartimento di Scienze e Tecnologie
Chimiche, Università ″Tor Vergata″, Via della Ricerca Scientifica, 1 I-00133 Rome, Italy
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