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Decorte M, Moazami Goudarzi N, Boone MN, Van Hove B, Preda FM, Verheyen E, Vervaet C, Vanhoorne V. The effect of particle size on the sublimation behavior of butylhydroxytoluene as antioxidant in tablets during storage and coating. Int J Pharm 2023; 643:123264. [PMID: 37488059 DOI: 10.1016/j.ijpharm.2023.123264] [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: 06/02/2023] [Revised: 07/03/2023] [Accepted: 07/06/2023] [Indexed: 07/26/2023]
Abstract
The effect of particle size on the sublimation behavior of butylhydroxytoluene (BHT) was investigated when BHT was included as antioxidant in tablets. Sublimation of pure BHT was found to be independent of its particle size, with pore formation on the surface of all tablets after storage at room temperature and above. Moreover, a higher residual BHT content after storage was detected in tablets containing a larger size fraction. X-ray µCT scans revealed the formation of peripherally larger pores at higher BHT particle sizes, implying a slower sublimation rate in the tablet core. A stability study indicated an increase in the extent of BHT sublimation at higher temperature and longer exposure time for all size fractions. The influence of BHT particle size was more pronounced when the tablets were stored at higher temperature, but the effect receded with longer exposure time. Similar trends were seen in film-coated tablets. Due to the short exposure time to elevated temperatures, a gradient in pore size was also observed at smaller particle sizes, with peripheral pores being larger in uncoated tablets. Superficial pores disappeared when a film coating was deposited onto the tablets. After storage of the film-coated tablets, less BHT had sublimated compared to the uncoated tablet. The coating layer did not prevent sublimation, but the process was slowed down.
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Affiliation(s)
- Milan Decorte
- Laboratory of Pharmaceutical Technology, Ghent University, Ottergemsesteenweg 460, B-9000 Ghent, Belgium
| | | | - Matthieu N Boone
- Centre for X-Ray Tomography - UGCT, Ghent University, Proeftuinstraat 86, B-9000 Ghent, Belgium
| | - Ben Van Hove
- Janssen R&D BE, Turnhoutsesteenweg 30, B-2340 Beerse, Belgium
| | | | - Ellen Verheyen
- Janssen R&D BE, Turnhoutsesteenweg 30, B-2340 Beerse, Belgium
| | - Chris Vervaet
- Laboratory of Pharmaceutical Technology, Ghent University, Ottergemsesteenweg 460, B-9000 Ghent, Belgium
| | - Valérie Vanhoorne
- Laboratory of Pharmaceutical Technology, Ghent University, Ottergemsesteenweg 460, B-9000 Ghent, Belgium.
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2
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Takhar M, Li Y, Ditto JC, Chan AWH. Formation pathways of aldehydes from heated cooking oils. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2023; 25:165-175. [PMID: 35194622 DOI: 10.1039/d1em00532d] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Cooking emissions account for a major fraction of urban volatile organic compounds and organic aerosol. Aldehyde species, in particular, are important exposure hazards in indoor residential and occupational environments, and precursors to particulate matter and ozone formation in outdoor air. Formation pathways of aldehydes from oils that lead to their emissions are not well understood. In this work, we investigate the underlying mechanisms involved in the formation of aldehydes from heated cooking oil emissions, through studying how antioxidants and oil composition modulate oxidation chemistry. Our results demonstrate that gaseous emissions are driven by radical-mediated autoxidation reactions in cooking oil, and the composition of cooking oils strongly influences the reaction mechanisms. Antioxidants have a dual effect on aldehyde emissions depending on the rates of radical propagation reactions. We propose a mechanistic framework that can be used to understand and predict cooking emissions under different cooking conditions. Our results highlight the need to understand the rates and mechanisms of autoxidation and other reactions in cooking oils in order to accurately predict the gas- and particle-phase emissions from food cooking in urban atmospheres.
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Affiliation(s)
- Manpreet Takhar
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, M5S 3E5, Canada
| | - Yunchun Li
- College of Science, Sichuan Agricultural University, Ya'an, 625014, China
| | - Jenna C Ditto
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, M5S 3E5, Canada
| | - Arthur W H Chan
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, M5S 3E5, Canada
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3
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Semitsoglou-Tsiapou S, Meador TB, Peng B, Aluwihare L. Photochemical (UV-vis/H 2O 2) degradation of carotenoids: Kinetics and molecular end products. CHEMOSPHERE 2022; 286:131697. [PMID: 34392195 DOI: 10.1016/j.chemosphere.2021.131697] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 07/20/2021] [Accepted: 07/25/2021] [Indexed: 06/13/2023]
Abstract
Constraining the formation mechanisms of organic matter that persists in aquatic reservoirs is important for determining the reactivity and fate of carbon and nutrients in these environments. Recent studies have linked dissolved organic matter (DOM) accumulating in the ocean to linear terpenoid structures, and carotenoid degradation products have been proposed as potential precursors. The prevalence of reactive oxygen species in aquatic environments and their potential to be quenched by carotenoids led us to examine radical-assisted photochemical degradation of carotenoids as a potential mechanism for DOM formation and transformation. Experiments were conducted with aggregates of β-carotene, astaxanthin, fucoxanthin and meso-zeaxanthin in THF:H2O under solar light irradiation assisted by hydrogen peroxide (UV-Vis/H2O2). Based on the fine structure of UV-Vis spectra, it was determined that β-carotene and meso-zeaxanthin formed J-type aggregates in experimental solutions, while astaxanthin and fucoxanthin formed H2-type aggregates, consistent with their structural characteristics. All carotenoids degraded under the combined influence of photolysis and OH scavenging, with fucoxanthin exhibiting the fastest degradation kinetics (kPO = 3.69 10-3 s-1) and meso-zeaxanthin the slowest (kPO = 4.37 10-4 s-1). The major degradation products detected by electrospray ionization (ESI) tandem mass spectrometry (MS/MS) were apo-aldehydes and apo-ketones, with the latter tending to accumulate, but epoxidation of the carotenoids also took place, and longer irradiation times resulted in lower molecular weight products. Reaction kinetics and accumulating carotenoid oxidation products identified in this study provide potential formation mechanisms and biomarkers for examining DOM cycling.
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Affiliation(s)
- Sofia Semitsoglou-Tsiapou
- Soil and Water Research Infrastructure, Biology Centre CAS, Na Sádkách 7, 37005, České Budějovice, Czech Republic.
| | - Travis B Meador
- Soil and Water Research Infrastructure, Biology Centre CAS, Na Sádkách 7, 37005, České Budějovice, Czech Republic; Institute of Hydrobiology, Biology Centre CAS, Na Sádkách 7, 37005, České Budějovice, Czech Republic; Institute of Soil Biology, Biology Centre CAS, Na Sádkách 7, 37005, České Budějovice, Czech Republic; Department of Ecosystem Biology, Faculty of Science, University of South Bohemia, Branišovská 1160/31, 37005, České Budějovice, Czech Republic
| | - Bo Peng
- Scripps Institution of Oceanography, University of California San Diego, 8622 Kennel Way, La Jolla, CA, 92037, San Diego, CA, USA
| | - Lihini Aluwihare
- Scripps Institution of Oceanography, University of California San Diego, 8622 Kennel Way, La Jolla, CA, 92037, San Diego, CA, USA
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4
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Zhao D, Wang L, Wimalasinghe RM, Tian J, Rustum A. Investigation to Identify the Root Cause of Out-of-Specification Results for Color of a Topical Pour-on Drug Product: A Case Study. Chromatographia 2021. [DOI: 10.1007/s10337-021-04077-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Alharthy SA, Hardej D. The role of transcription factor Nrf2 in the toxicity of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) in C57BL/6 mouse astrocytes. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2021; 86:103652. [PMID: 33812015 DOI: 10.1016/j.etap.2021.103652] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 03/24/2021] [Accepted: 03/26/2021] [Indexed: 05/14/2023]
Abstract
Perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) are members of perfluoroalkyl substances (PFAS). This study aimed to determine the protective role of Nrf2 against the toxicity of these agents. Nrf2-/- and wild-type astrocytes were exposed to PFOS (75-600 μM) and PFOA (400-1000 μM) for 24 h. Lactate dehydrogenase (LDH) release was significantly higher in nrf2-/- than in the wild-type astrocytes. Exposure to 600 μM PFOS and 800 μM PFOA showed significant increases in reactive oxygen species, lipid peroxidation, and apoptosis in nrf2-/- astrocytes as compared to wild-type astrocytes. The GSH/GSSG ratio was significantly decreased in nrf2-/- astrocytes when compared to wild-type astrocytes. Additionally, PFOS and PFOS caused dramatic ultrastructural alterations to the mitochondria. BHT pretreatment in wild-type cells decreased ROS production with exposure to both agents. Results of the present study conclude that PFOS and PFOA are cytotoxic to astrocytes and that nrf2 -/- cells are more sensitive to toxicity by these agents.
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Affiliation(s)
- Saif A Alharthy
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Jamaica, NY, 11439, USA; Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Diane Hardej
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Jamaica, NY, 11439, USA.
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6
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Makhaeva GF, Kovaleva NV, Rudakova EV, Boltneva NP, Lushchekina SV, Faingold II, Poletaeva DA, Soldatova YV, Kotelnikova RA, Serkov IV, Ustinov AK, Proshin AN, Radchenko EV, Palyulin VA, Richardson RJ. New Multifunctional Agents Based on Conjugates of 4-Amino-2,3-polymethylenequinoline and Butylated Hydroxytoluene for Alzheimer's Disease Treatment. Molecules 2020; 25:molecules25245891. [PMID: 33322783 PMCID: PMC7763995 DOI: 10.3390/molecules25245891] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 12/08/2020] [Accepted: 12/09/2020] [Indexed: 01/18/2023] Open
Abstract
New hybrids of 4-amino-2,3-polymethylenequinoline with different sizes of the aliphatic ring linked to butylated hydroxytoluene (BHT) by enaminoalkyl (7) or aminoalkyl (8) spacers were synthesized as potential multifunctional agents for Alzheimer's disease (AD) treatment. All compounds were potent inhibitors of acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) with selectivity toward BChE. Lead compound 8c, 2,6-di-tert-butyl-4-{[2-(7,8,9,10- tetrahydro-6H-cyclohepta[b]quinolin-11-ylamino)-ethylimino]-methyl}-phenol exhibited an IC50(AChE) = 1.90 ± 0.16 µM, IC50(BChE) = 0.084 ± 0.008 µM, and 13.6 ± 1.2% propidium displacement at 20 μM. Compounds possessed low activity against carboxylesterase, indicating likely absence of clinically unwanted drug-drug interactions. Kinetics were consistent with mixed-type reversible inhibition of both cholinesterases. Docking indicated binding to catalytic and peripheral AChE sites; peripheral site binding along with propidium displacement suggest the potential of the hybrids to block AChE-induced β-amyloid aggregation, a disease-modifying effect. Compounds demonstrated high antioxidant activity in ABTS and FRAP assays as well as inhibition of luminol chemiluminescence and lipid peroxidation in mouse brain homogenates. Conjugates 8 with amine-containing spacers were better antioxidants than those with enamine spacers 7. Computational ADMET profiles for all compounds predicted good blood-brain barrier distribution (permeability), good intestinal absorption, and medium cardiac toxicity risk. Overall, based on their favorable pharmacological and ADMET profiles, conjugates 8 appear promising as candidates for AD therapeutics.
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Affiliation(s)
- Galina F. Makhaeva
- Institute of Physiologically Active Compounds Russian Academy of Sciences, 142432 Chernogolovka, Russia; (G.F.M.); (N.V.K.); (E.V.R.); (N.P.B.); (S.V.L.); (I.V.S.); (A.K.U.); (A.N.P.); (E.V.R.); (V.A.P.)
| | - Nadezhda V. Kovaleva
- Institute of Physiologically Active Compounds Russian Academy of Sciences, 142432 Chernogolovka, Russia; (G.F.M.); (N.V.K.); (E.V.R.); (N.P.B.); (S.V.L.); (I.V.S.); (A.K.U.); (A.N.P.); (E.V.R.); (V.A.P.)
| | - Elena V. Rudakova
- Institute of Physiologically Active Compounds Russian Academy of Sciences, 142432 Chernogolovka, Russia; (G.F.M.); (N.V.K.); (E.V.R.); (N.P.B.); (S.V.L.); (I.V.S.); (A.K.U.); (A.N.P.); (E.V.R.); (V.A.P.)
| | - Natalia P. Boltneva
- Institute of Physiologically Active Compounds Russian Academy of Sciences, 142432 Chernogolovka, Russia; (G.F.M.); (N.V.K.); (E.V.R.); (N.P.B.); (S.V.L.); (I.V.S.); (A.K.U.); (A.N.P.); (E.V.R.); (V.A.P.)
| | - Sofya V. Lushchekina
- Institute of Physiologically Active Compounds Russian Academy of Sciences, 142432 Chernogolovka, Russia; (G.F.M.); (N.V.K.); (E.V.R.); (N.P.B.); (S.V.L.); (I.V.S.); (A.K.U.); (A.N.P.); (E.V.R.); (V.A.P.)
- Emanuel Institute of Biochemical Physics Russian Academy of Sciences, 119334 Moscow, Russia
| | - Irina I. Faingold
- Institute of Problems of Chemical Physics of Russian Academy of Sciences, 142432 Chernogolovka, Russia; (I.I.F.); (D.A.P.); (Y.V.S.); (R.A.K.)
| | - Darya A. Poletaeva
- Institute of Problems of Chemical Physics of Russian Academy of Sciences, 142432 Chernogolovka, Russia; (I.I.F.); (D.A.P.); (Y.V.S.); (R.A.K.)
| | - Yuliya V. Soldatova
- Institute of Problems of Chemical Physics of Russian Academy of Sciences, 142432 Chernogolovka, Russia; (I.I.F.); (D.A.P.); (Y.V.S.); (R.A.K.)
| | - Raisa A. Kotelnikova
- Institute of Problems of Chemical Physics of Russian Academy of Sciences, 142432 Chernogolovka, Russia; (I.I.F.); (D.A.P.); (Y.V.S.); (R.A.K.)
| | - Igor V. Serkov
- Institute of Physiologically Active Compounds Russian Academy of Sciences, 142432 Chernogolovka, Russia; (G.F.M.); (N.V.K.); (E.V.R.); (N.P.B.); (S.V.L.); (I.V.S.); (A.K.U.); (A.N.P.); (E.V.R.); (V.A.P.)
| | - Anatoly K. Ustinov
- Institute of Physiologically Active Compounds Russian Academy of Sciences, 142432 Chernogolovka, Russia; (G.F.M.); (N.V.K.); (E.V.R.); (N.P.B.); (S.V.L.); (I.V.S.); (A.K.U.); (A.N.P.); (E.V.R.); (V.A.P.)
| | - Alexey N. Proshin
- Institute of Physiologically Active Compounds Russian Academy of Sciences, 142432 Chernogolovka, Russia; (G.F.M.); (N.V.K.); (E.V.R.); (N.P.B.); (S.V.L.); (I.V.S.); (A.K.U.); (A.N.P.); (E.V.R.); (V.A.P.)
| | - Eugene V. Radchenko
- Institute of Physiologically Active Compounds Russian Academy of Sciences, 142432 Chernogolovka, Russia; (G.F.M.); (N.V.K.); (E.V.R.); (N.P.B.); (S.V.L.); (I.V.S.); (A.K.U.); (A.N.P.); (E.V.R.); (V.A.P.)
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Vladimir A. Palyulin
- Institute of Physiologically Active Compounds Russian Academy of Sciences, 142432 Chernogolovka, Russia; (G.F.M.); (N.V.K.); (E.V.R.); (N.P.B.); (S.V.L.); (I.V.S.); (A.K.U.); (A.N.P.); (E.V.R.); (V.A.P.)
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Rudy J. Richardson
- Department of Environmental Health Sciences, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109, USA
- Center of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI 48109, USA
- Michigan Institute for Computational Discovery and Engineering, University of Michigan, Ann Arbor, MI 48109, USA
- Correspondence: ; Tel.: +1-734-936-0769
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7
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Hossain KFB, Hosokawa T, Saito T, Kurasaki M. Amelioration of butylated hydroxytoluene against inorganic mercury induced cytotoxicity and mitochondrial apoptosis in PC12 cells via antioxidant effects. Food Chem Toxicol 2020; 146:111819. [PMID: 33091556 DOI: 10.1016/j.fct.2020.111819] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 09/21/2020] [Accepted: 10/13/2020] [Indexed: 12/14/2022]
Abstract
Mercury (Hg) is a toxic metal, well-known for its dangerous health effects on human. Butylated hydroxytoluene (BHT) is a phenolic component generally consumed as a food additive as an antioxidant. However, BHT induced antioxidant properties against heavy metals-influenced toxicity are little studied. We hypothesized that BHT has a regulatory effect on Hg-induced cytotoxicity. The objective of this research was to assess the protecting effects of BHT against inorganic Hg (iHg)-toxicity in PC12 cells, where cells were treated with/without HgCl2 (Hg2+) (5 μM) and BHT (100 μM) for 48 h and analyzed further. Cells treated by Hg caused a significant cell viability reduction, membrane damage, glutathione reduction, DNA fragmentation, ROS generation, with suppressed expressions of akt, mTOR, ERK1, Nrf2 and HO1; and elevated apoptotic expressions of p53, Bax, cytochrome c and active caspase 3. However, BHT and Hg2+ co-exposure showed prevention against Hg2+-toxicity by improving GSH content and inhibiting ROS generation and oxidative stress mediated damages. Additionally, BHT co-treatment inverted the pro-apoptotic proteins by augmenting pro-survival regulatory proteins akt, mTOR, ERK1, Nrf2 and HO1. These findings proved that BHT inhibits Hg2+-toxicity, hindering ROS generation and intrinsic apoptosis, via enhancing glutathione and antioxidants; and suggested BHT implications as therapeutic.
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Affiliation(s)
| | - Toshiyuki Hosokawa
- Institute for the Advancement of Higher Education, Hokkaido University, Sapporo 060-0817, Japan
| | - Takeshi Saito
- Faculty of Health Sciences, Hokkaido University, Sapporo 060-0812, Japan
| | - Masaaki Kurasaki
- Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan; Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan
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8
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Achar JC, Nam G, Jung J, Klammler H, Mohamed MM. Microbubble ozonation of the antioxidant butylated hydroxytoluene: Degradation kinetics and toxicity reduction. ENVIRONMENTAL RESEARCH 2020; 186:109496. [PMID: 32304926 DOI: 10.1016/j.envres.2020.109496] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 03/08/2020] [Accepted: 04/06/2020] [Indexed: 06/11/2023]
Abstract
Butylated hydroxytoluene (BHT) is recognized as a crucial pollutant in aquatic environments, but efforts to achieve its complete removal are without success. The aim of this study was to investigate the degradation efficiency of BHT in water using ozone microbubbles (OMB), coupled with toxicity change assessment at sub-lethal BHT concentrations (0.34, 0.45 and 0.90 μM) based on oxidative stress biomarkers in Daphnia magna. The efficiency of OMB on ozone gas mass transfer was assessed and the contribution of hydroxyl radicals (·OH) in the degradation of BHT was determined using p-chlorobenzoic acid (pCBA) probe compound and a ·OH radical scavenger (sodium carbonate, Na2CO3). The ozone gas mass transfer coefficient (kLa = 1.02 × 10-2 s-1) was much larger than the ozone self-decomposition rate (kd = 8 × 10-4 s-1) implying little influence of self-decomposing ozone in the volumetric ozone transfer during OMB generation. Generally, OMB improved ozone gas mass transfer (1.3-19-fold) relative to conventional ozone techniques, while indirect reaction of BHT with ·OH was dominant (82%) over the direct reaction with molecular ozone. Addition of 15, 25 and 35 mM Na2CO3 reduced BHT degradation by 30, 50 and 65%, respectively, indicating the significance of ·OH in the degradation of BHT. Increase in initial BHT concentration correspondingly reduced its removal rate by OMB possibly due to increase in metabolites produced during ozonation. Post BHT treatment exposure tests recorded significant (p < 0.05) reductions in oxidative stress (according to enzyme activities changes) in D. magna compared to pretreatment tests, demonstrating the effectiveness of OMB in detoxification of BHT. Overall, the results of the study indicate that OMB is extremely efficient in complete degradation of BHT in water and, consequently, significantly (p < 0.05) reducing its toxicity.
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Affiliation(s)
- Jerry Collince Achar
- Division of Environmental Science and Ecological Engineering, Korea University, Seoul, Republic of Korea
| | - Gwiwoong Nam
- Division of Environmental Science and Ecological Engineering, Korea University, Seoul, Republic of Korea
| | - Jinho Jung
- Division of Environmental Science and Ecological Engineering, Korea University, Seoul, Republic of Korea
| | - Harald Klammler
- Department of Geosciences, Federal University of Bahia, Salvador, Brazil
| | - Mohamed M Mohamed
- Civil and Environmental Engineering Department, College of Engineering, United Arab Emirates University, Al Ain, United Arab Emirates; National Water Center, United Arab Emirates University, Al Ain, United Arab Emirates.
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9
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Jayram J, Xulu BA, Jeena V. Iodine/DMSO promoted oxidation of benzylic Csp3–H bonds to diketones – A mechanistic investigation. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.130617] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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11
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He X, Zhang Q. Synthesis, Purification, and Mass Spectrometric Characterization of Stable Isotope-Labeled Amadori-Glycated Phospholipids. ACS OMEGA 2018; 3:15725-15733. [PMID: 30533579 PMCID: PMC6275948 DOI: 10.1021/acsomega.8b01893] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 11/06/2018] [Indexed: 06/09/2023]
Abstract
Nonenzymatic glycation of lipids plays an important role in several physiological and pathological processes, such as normal aging and complications of diabetes mellitus. To develop liquid chromatography coupled with mass spectrometric (LC-MS) methods for accurate analysis of Amadori compound-glycated lipids from biological samples, it is essential to obtain isotope-labeled Amadori-lipid standards. Herein, we report optimized methods for the preparation of six stable isotope-labeled Amadori-glycated lipid standards covering four types of lipids, including [13C6]Amadori-phosphatidyl ethanolamine (PE), -phosphatidyl serine (PS), -LysoPE, and -LysoPS. Optimal conditions for the synthesis and purification of these four types of Amadori-glycated lipids were detailed in this study. LC-MS and LC-UV analyses showed that destination products were highly purified (>95%). Accurate mass and MS/MS fragmentation in both positive- and negative-ion modes further validated the identification of these six synthetic [13C6]Amadori-glycated lipid standards. Successful preparation of these highly purified isotope-labeled standards makes it possible to develop targeted LC-MS/MS methods for accurate analysis of Amadori-glycated phospholipids from biological samples.
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Affiliation(s)
- Xiaobo He
- Center for Translational
Biomedical Research, University of North
Carolina at Greensboro, North Carolina
Research Campus, Kannapolis, North Carolina 28081, United States
| | - Qibin Zhang
- Center for Translational
Biomedical Research, University of North
Carolina at Greensboro, North Carolina
Research Campus, Kannapolis, North Carolina 28081, United States
- Department of Chemistry & Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina 27412, United States
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12
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Jayram J, Jeena V. An iodine/DMSO-catalyzed sequential one-pot approach to 2,4,5-trisubstituted-1 H-imidazoles from α-methylene ketones. RSC Adv 2018; 8:37557-37563. [PMID: 35558600 PMCID: PMC9089320 DOI: 10.1039/c8ra07238h] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 11/01/2018] [Indexed: 01/08/2023] Open
Abstract
A sequential one-pot approach to 2,4,5-trisubstituted imidazoles has been developed from α-methylene ketones and aldehydes. This methodology employs air-moisture stable reaction conditions and an inexpensive iodine/DMSO system affording a diverse range of known and novel (substrate scope) 2,4,5-trisubstituted imidazoles in moderate to excellent yields. The iodine/DMSO system was extended to the domino convergent synthesis of two functionalized intermediates, benzil and benzaldehyde, to produce the final product.
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Affiliation(s)
- Janeeka Jayram
- School of Chemistry and Physics, University of KwaZulu-Natal Scottsville Pietermaritzburg 3209 South Africa
| | - Vineet Jeena
- School of Chemistry and Physics, University of KwaZulu-Natal Scottsville Pietermaritzburg 3209 South Africa
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13
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Jonasdottir HS, Brouwers H, Toes REM, Ioan-Facsinay A, Giera M. Effects of anticoagulants and storage conditions on clinical oxylipid levels in human plasma. Biochim Biophys Acta Mol Cell Biol Lipids 2018; 1863:1511-1522. [PMID: 30308322 DOI: 10.1016/j.bbalip.2018.10.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 09/30/2018] [Accepted: 10/05/2018] [Indexed: 01/16/2023]
Abstract
Metabolomics and lipidomics are of fundamental importance to personalized healthcare. Particularly the analysis of bioactive lipids is of relevance to a better understanding of various diseases. Within clinical routines, blood derived samples are widely used for diagnostic and research purposes. Hence, standardized and validated procedures for blood collection and storage are mandatory, in order to guarantee sample integrity and relevant study outcomes. We here investigated different plasma storage conditions and their effect on plasma fatty acid and oxylipid levels. Our data clearly indicate the importance of storage conditions for plasma lipidomic analysis. Storage at very low temperature (-80 °C) and the addition of methanol directly after sampling are the most important measures to avoid ex vivo synthesis of oxylipids. Furthermore, we identified critical analytes being affected under certain storage conditions. Finally, we carried out chiral analysis and found possible residual enzymatic activity to be one of the contributors to the ex vivo formation of oxylipids even at -20 °C.
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Affiliation(s)
- Hulda S Jonasdottir
- Leiden University Medical Center, Center for Proteomics and Metabolomics, Albinusdreef 2, 2300RC Leiden, the Netherlands; Leiden University Medical Center, Department of Rheumatology, Albinusdreef 2, 2300RC Leiden, the Netherlands
| | - Hilde Brouwers
- Leiden University Medical Center, Department of Rheumatology, Albinusdreef 2, 2300RC Leiden, the Netherlands
| | - René E M Toes
- Leiden University Medical Center, Department of Rheumatology, Albinusdreef 2, 2300RC Leiden, the Netherlands
| | - Andreea Ioan-Facsinay
- Leiden University Medical Center, Department of Rheumatology, Albinusdreef 2, 2300RC Leiden, the Netherlands
| | - Martin Giera
- Leiden University Medical Center, Center for Proteomics and Metabolomics, Albinusdreef 2, 2300RC Leiden, the Netherlands.
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Saavedra DI, Rencher BD, Kwon DH, Smith SJ, Ess DH, Andrus MB. Synthesis and Computational Studies Demonstrate the Utility of an Intramolecular Styryl Diels–Alder Reaction and Di-t-butylhydroxytoluene Assisted [1,3]-Shift to Construct Anticancer dl-Deoxypodophyllotoxin. J Org Chem 2018; 83:2018-2026. [DOI: 10.1021/acs.joc.7b02957] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Diana I. Saavedra
- Department of Chemistry and Biochemistry, Brigham Young University, C100 BNSN, Provo, Utah 84604, United States
| | - Benjamin D. Rencher
- Department of Chemistry and Biochemistry, Brigham Young University, C100 BNSN, Provo, Utah 84604, United States
| | - Doo-Hyun Kwon
- Department of Chemistry and Biochemistry, Brigham Young University, C100 BNSN, Provo, Utah 84604, United States
| | - Stacey J. Smith
- Department of Chemistry and Biochemistry, Brigham Young University, C100 BNSN, Provo, Utah 84604, United States
| | - Daniel H. Ess
- Department of Chemistry and Biochemistry, Brigham Young University, C100 BNSN, Provo, Utah 84604, United States
| | - Merritt B. Andrus
- Department of Chemistry and Biochemistry, Brigham Young University, C100 BNSN, Provo, Utah 84604, United States
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Yu W, Yang W, Liu R, Qin L, Lei Y, Liu L, Zhai D, Li B, Kang F. A soluble phenolic mediator contributing to enhanced discharge capacity and low charge overpotential for lithium-oxygen batteries. Electrochem commun 2017. [DOI: 10.1016/j.elecom.2017.04.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Jurowski K, Kochan K, Walczak J, Barańska M, Piekoszewski W, Buszewski B. Comprehensive review of trends and analytical strategies applied for biological samples preparation and storage in modern medical lipidomics: State of the art. Trends Analyt Chem 2017. [DOI: 10.1016/j.trac.2016.10.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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17
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Black HS. Reassessment of a Free Radical Theory of Cancer With Emphasis on Ultraviolet Carcinogenesis. Integr Cancer Ther 2016; 3:279-93. [PMID: 15523099 DOI: 10.1177/1534735404270612] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Pro-oxidants, reactive species and free radicals, are toxic substances that can cause oxidative damage to major constituents of biological systems. In contradistinction, antioxidants are defined as any substance that significantly prevents the pro-oxidant-initiated oxidation of a substrate. Consequently, it was suggested that it might be possible to reduce free radical damage and thus cancer risk through 3 dietary changes: (1) caloric reduction, that is, lowering the level of free radical reactions arising in the course of normal metabolism; (2) minimize dietary components that increase the level of free radical reactions (eg, polyunsaturated fats); and (3) supplement the diet with one or more free radical reaction inhibitors (antioxidants). Lipid peroxidation exemplifies the type of chain reaction initiated by free radicals in (2) and (3). Both the phenolic antioxidant butylated hydroxytoluene (BHT) and the carotenoid β-carotene can terminate such reactions and have been shown to influence ultraviolet (UV) carcinogenesis. However, there is a lack of correlation between physicochemical and patho-physiological responses in both instances. Whereas the influence on UV carcinogenesis of both antioxidants has been reported to diminish as the level of dietary fat decreases, pointing to the involvement of lipid peroxidative reactions, the mode of BHT’s action in inhibiting UV carcinogenesis appears to be related to UV dose diminution through increased spectral absorbance of the stratum corneum. β-carotene has no such effect and may actually exacerbate UV carcinogenesis under certain dietary conditions. This paradox points to the complex relationship between chemical mechanisms and biological mode of action of antioxidants. Recent clinical and experimental data suggest that antioxidant supplementation of the complex and intricately balanced natural antioxidant defense system as a cancer prevention strategy will demand extreme caution.
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Affiliation(s)
- Homer S Black
- Department of Dermatology, Baylor College of Medicine, Houston, Texas, USA.
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18
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Metherel AH, Stark KD. The stability of blood fatty acids during storage and potential mechanisms of degradation: A review. Prostaglandins Leukot Essent Fatty Acids 2016; 104:33-43. [PMID: 26802940 DOI: 10.1016/j.plefa.2015.12.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Revised: 12/03/2015] [Accepted: 12/05/2015] [Indexed: 01/28/2023]
Abstract
Fatty acids in blood samples, particularly polyunsaturated fatty acids (PUFAs), are susceptible to degradation through peroxidation reactions during long-term storage. Storage of blood samples is necessary in almost all studies and is crucial for larger clinical studies and in field research settings where it is not plausible for analytical infrastructure. Despite this, PUFA stability during blood storage is often overlooked. This review introduces and discusses lipid peroxidation and popular strategies employed to prevent or minimize peroxidation reactions during fatty acid analysis. Further, an in-depth examination of fatty acid stability during storage of blood is discussed in detail for all blood fractions including plasma/serum, erythrocytes and whole blood stored both in cryovials and on chromatography paper before discussing the associated mechanisms of degradation during storage. To our knowledge this is the first review of its kind and will provide researchers with the necessary information to confidently store blood samples for fatty acid analysis.
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Affiliation(s)
- Adam H Metherel
- University of Waterloo, 200 University Avenue, Waterloo, ON, Canada N2L 3G1
| | - Ken D Stark
- University of Waterloo, 200 University Avenue, Waterloo, ON, Canada N2L 3G1.
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Abdulwahab MK, Ariffin A, Yehye WA, Abdul-Aziz A, Kareem HS, Nordin N. Synthesis of the Hydrazones of 2-((3,5-Di-tert-butyl-4-hydroxybenzyl)thio) acetohydrazide and the Study of their Radical Scavenging Activity by the DPPH Assay and the Computational Method. B KOREAN CHEM SOC 2015. [DOI: 10.1002/bkcs.10553] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Muhammad K. Abdulwahab
- Department of Chemistry, Faculty of Science; University of Malaya; Kuala Lumpur 50603 Malaysia
| | - Azhar Ariffin
- Department of Chemistry, Faculty of Science; University of Malaya; Kuala Lumpur 50603 Malaysia
| | - Wageeh A. Yehye
- Nanotechnology & Catalysis Research Centre (NANOCAT); University of Malaya; Kuala Lumpur 50603 Malaysia
| | - Azlina Abdul-Aziz
- Department of Molecular Medicine, Faculty of Medicine; University of Malaya; Kuala Lumpur 50603 Malaysia
| | - Huda S. Kareem
- Department of Chemistry, Faculty of Science; University of Malaya; Kuala Lumpur 50603 Malaysia
| | - Nurdiana Nordin
- Department of Chemistry, Faculty of Science; University of Malaya; Kuala Lumpur 50603 Malaysia
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Greer EM, Quezada CS, Cosgriff CV. Butylated hydroxytoluene enediyne: access to diradical and electrophilic quinone methide intermediates. J PHYS ORG CHEM 2015. [DOI: 10.1002/poc.3420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Edyta M. Greer
- Department of Natural Sciences; Baruch College; 17 Lexington Ave 10010 New York NY USA
| | - Cesar S. Quezada
- Department of Natural Sciences; Baruch College; 17 Lexington Ave 10010 New York NY USA
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Nieva-Echevarría B, Manzanos MJ, Goicoechea E, Guillén MD. 2,6-Di-Tert-Butyl-Hydroxytoluene and Its Metabolites in Foods. Compr Rev Food Sci Food Saf 2014; 14:67-80. [PMID: 33401811 DOI: 10.1111/1541-4337.12121] [Citation(s) in RCA: 98] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Accepted: 10/02/2014] [Indexed: 11/28/2022]
Abstract
2,6-Di-tert-butyl-hydroxytoluene (BHT, E-321) is a synthetic phenolic antioxidant which has been widely used as an additive in the food, cosmetic, and plastic industries for the last 70 y. Although it is considered safe for human health at authorized levels, its ubiquitous presence and the controversial toxicological data reported are of great concern for consumers. In recent years, special attention has been paid to these 14 metabolites or degradation products: BHT-CH2 OH, BHT-CHO, BHT-COOH, BHT-Q, BHT-QM, DBP, BHT-OH, BHT-OOH, TBP, BHQ, BHT-OH(t), BHT-OH(t)QM, 2-BHT, and 2-BHT-QM. These derived compounds could pose a human health risk from a food safety point of view, but they have been little studied. In this context, this review deals with the occurrence, origin, and fate of BHT in foodstuffs, its biotransformation into metabolites, their toxicological implications, their antioxidant and prooxidant properties, the analytical determination of metabolites in foods, and human dietary exposure. Moreover, noncontrolled additional sources of exposure to BHT and its metabolites are highlighted. These include their carryover from feed to fish, poultry and eggs, their presence in smoke flavorings, their migration from plastic pipelines and packaging to water and food, and their presence in natural environments, from which they can reach the food chain.
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Affiliation(s)
- Bárbara Nieva-Echevarría
- Food Technology, Faculty of Pharmacy, Lascaray Research Center, Univ. of the Basque Country (UPV/EHU), Paseo de la Universidad nº 7, 01006, Vitoria, Spain
| | - María J Manzanos
- Food Technology, Faculty of Pharmacy, Lascaray Research Center, Univ. of the Basque Country (UPV/EHU), Paseo de la Universidad nº 7, 01006, Vitoria, Spain
| | - Encarnación Goicoechea
- Food Technology, Faculty of Pharmacy, Lascaray Research Center, Univ. of the Basque Country (UPV/EHU), Paseo de la Universidad nº 7, 01006, Vitoria, Spain
| | - María D Guillén
- Food Technology, Faculty of Pharmacy, Lascaray Research Center, Univ. of the Basque Country (UPV/EHU), Paseo de la Universidad nº 7, 01006, Vitoria, Spain
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Puri N, Zhang F, Monu SR, Sodhi K, Bellner L, Lamon BD, Zhang Y, Abraham NG, Nasjletti A. Antioxidants condition pleiotropic vascular responses to exogenous H(2)O(2): role of modulation of vascular TP receptors and the heme oxygenase system. Antioxid Redox Signal 2013; 18:471-80. [PMID: 22867102 PMCID: PMC3545357 DOI: 10.1089/ars.2012.4587] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Revised: 08/06/2012] [Accepted: 08/07/2012] [Indexed: 11/13/2022]
Abstract
AIMS Hydrogen peroxide (H(2)O(2)), a nonradical oxidant, is employed to ascertain the role of redox mechanisms in regulation of vascular tone. Where both dilation and constriction have been reported, we examined the hypothesis that the ability of H(2)O(2) to effect vasoconstriction or dilation is conditioned by redox mechanisms and may be modulated by antioxidants. RESULTS Exogenous H(2)O(2) (0.1-10.0 μM), dose-dependently reduced the internal diameter of rat renal interlobular and 3rd-order mesenteric arteries (p<0.05). This response was obliterated in arteries pretreated with antioxidants, including tempol, pegylated superoxide dismutase (PEG-SOD), butylated hydroxytoluene (BHT), and biliverdin (BV). However, as opposed to tempol or PEG-SOD, BHT & BV, antioxidants targeting radicals downstream of H(2)O(2), also uncovered vasodilation. INNOVATIONS Redox-dependent vasoconstriction to H(2)O(2) was blocked by inhibitors of cyclooxygenase (COX) (indomethacin-10 μM), thromboxane (TP) synthase (CGS13080-10 μM), and TP receptor antagonist (SQ29548-1 μM). However, H(2)O(2) did not increase vascular thromboxane B(2) release; instead, it sensitized the vasculature to a TP agonist, U46619, an effect reversed by PEG-SOD. Antioxidant-conditioned dilatory response to H(2)O(2) was accompanied by enhanced vascular heme oxygenase (HO)-dependent carbon monoxide generation and was abolished by HO inhibitors or by HO-1 & 2 antisense oligodeoxynucleotides treatment of SD rats. CONCLUSION These results demonstrate that H(2)O(2) has antioxidant-modifiable pleiotropic vascular effects, where constriction and dilation are brought about in the same vascular segment. H(2)O(2)-induced oxidative stress increases vascular TP sensitivity and predisposes these arterial segments to constrictor prostanoids. Conversely, vasodilation is reliant upon HO-derived products whose synthesis is stimulated only in the presence of antioxidants targeting radicals downstream of H(2)O(2).
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Affiliation(s)
- Nitin Puri
- Department of Pharmacology, New York Medical College, Valhalla, New York, USA.
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Barbieriková Z, Mihalíková M, Brezová V. Photoinduced Oxidation of Sterically Hindered Amines in Acetonitrile Solutions and Titania Suspensions (An EPR Study). Photochem Photobiol 2012; 88:1442-54. [DOI: 10.1111/j.1751-1097.2012.01189.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Hadis MA, Shortall AC, Palin WM. Competitive light absorbers in photoactive dental resin-based materials. Dent Mater 2012; 28:831-41. [PMID: 22578661 DOI: 10.1016/j.dental.2012.04.029] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Revised: 03/16/2012] [Accepted: 04/16/2012] [Indexed: 10/28/2022]
Abstract
OBJECTIVES The absorbance profile of photoinitiators prior to, during and following polymerization of light curable resin-based materials will have a significant effect on the cure and color properties of the final material. So-called "colorless" photoinitiators are used in some light-activated resin-based composite restorative materials to lessen the yellowing effect of camphoroquinone (CQ) in order to improve the esthetic quality of dental restorations. This work characterizes absorption properties of commonly used photoinitiators, an acylphosphine oxide (TPO) and CQ, and assesses their influence on material discoloration. METHODS Dimethacrylate resin formulations contained low (0.0134 mol/dm(3)), intermediate (0.0405 mol/dm(3)) or high (0.0678 mol/dm(3)) concentrations of the photoinitiators and the inhibitor, butylated hydroxytoluene (BHT) at 0, 0.1 or 0.2% by mass. Disc shaped specimens (n = 3) of each resin were polymerized for 60s using a halogen light curing unit. Dynamic measurements of photoinitiator absorption, polymer conversion and reaction temperature were performed. A spectrophotometer was used to measure the color change before and after cure. RESULTS GLM three-way analysis of variance revealed significant differences (p<0.001), where photoinitiator concentration (df = 2; F = 618.83)>photoinitiator type (df = 1; F = 176.12)>% BHT (df = 2, F = 13.17). BHT concentration affected the rate of polymerization and produced lower conversion in some of the CQ-based resins. Significant differences between photoinitiator type and concentrations were seen in color (where TPO resins became yellower and camphoroquinone resins became less yellow upon irradiation). Reaction temperature, kinetics and conversion also differed significantly for both initiators (p<0.001). Despite TPO-based resins producing a visually perceptible color change upon polymerization, the color change was significantly less than that produced with CQ-based resins. SIGNIFICANCE Although some photoinitiators such as TPO may be a more esthetic alternative to CQ, they may actually cause significant color contamination when used in high concentrations and therefore manufacturers should limit its concentration in order to improve its esthetic quality.
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Affiliation(s)
- Mohammed A Hadis
- Biomaterials Unit, University of Birmingham, School of Dentistry, College of Medical and Dental Sciences, St Chads Queensway, Birmingham B4 6NN, United Kingdom.
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Engin AB, Bukan N, Kurukahvecioglu O, Memis L, Engin A. Effect of butylated hydroxytoluene (E321) pretreatment versus L-arginine on liver injury after sub-lethal dose of endotoxin administration. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2011; 32:457-464. [PMID: 22004966 DOI: 10.1016/j.etap.2011.08.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2010] [Revised: 08/26/2011] [Accepted: 08/30/2011] [Indexed: 05/31/2023]
Abstract
Aim of this study was to compare the effects of L-arginine (L-arg) and food-antioxidant butylated hydroxytoluene (BHT) against oxidative stress of Escherichia coli endotoxin (LPS) in liver. Ninety Wistar albino rats were assigned in three groups. Rats received one of the following pre-treatment previous to 5mg/kg LPS intraperitoneally: saline, L-arg (NO donor, 100mg/kg) or BHT (250 mg/kg/day), for 3 days. At second, fourth and sixth hours, plasma nitrite-plus-nitrate, circulating liver enzymes, glutathione levels, superoxide dismutase, glutathione peroxidase activities were measured. The most remarkable liver injury was evident in BHT pre-treated animals at all time points compared to L-arg pre-treated rats. While BHT enhanced superoxide dismutase activities following LPS, glutathione decreased simultaneously compared to L-arg group. Although the risk associated with the use of BHT alone in subthreshold doses appeared to be low, higher risk of liver toxicity should be considered when over-consuming this food additive in endotoxemic settings.
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Affiliation(s)
- Ayse Basak Engin
- Gazi University, Faculty of Pharmacy, Department of Toxicology, TR 06330 Hipodrom, Ankara, Turkey
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26
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In situ formation of silver nanoparticles in PMMA via reduction of silver ions by butylated hydroxytoluene. Struct Chem 2010. [DOI: 10.1007/s11224-010-9671-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Martin HD, Kock S, Scherrers R, Lutter K, Wagener T, Hundsdörfer C, Frixel S, Schaper K, Ernst H, Schrader W, Görner H, Stahl W. 3,3'-Dihydroxyisorenieratene, a natural carotenoid with superior antioxidant and photoprotective properties. Angew Chem Int Ed Engl 2009; 48:400-3. [PMID: 19034947 DOI: 10.1002/anie.200803668] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Hans-Dieter Martin
- Institute of Organic Chemistry and Macromolecular Chemistry, Natural Compounds, and Photoprotection, Heinrich-Heine-University Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany.
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Martin HD, Kock S, Scherrers R, Lutter K, Wagener T, Hundsdörfer C, Frixel S, Schaper K, Ernst H, Schrader W, Görner H, Stahl W. 3,3′-Dihydroxyisorenieratin, ein natürliches Carotinoid mit überlegenen antioxidativen und photoprotektiven Eigenschaften. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200803668] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Friaa O, Chaleix V, Lecouvey M, Brault D. Reaction between the anesthetic agent propofol and the free radical DPPH in semiaqueous media: kinetics and characterization of the products. Free Radic Biol Med 2008; 45:1011-8. [PMID: 18672054 DOI: 10.1016/j.freeradbiomed.2008.07.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2008] [Revised: 07/01/2008] [Accepted: 07/01/2008] [Indexed: 11/23/2022]
Abstract
The reaction of the free radical diphenylpicrylhydrazyl (DPPH ) with the anesthetic agent 2,6-diisopropylphenol (propofol, PPF) was investigated in buffered hydroalcoholic media. The kinetics was followed using a stopped-flow system. DPPH was reduced to the hydrazine analogue DPPH-H with a measured stoichiometry (DPPH /PPF) of 2. The main product of the reaction, 3,5,3',5'-tetraisopropyl-(4,4')-diphenoquinone (PPFDQ) was isolated by chromatography and its structure was fully characterized. The reaction mechanism was inferred from the stoichiometry, kinetics, and product identification. The first step, which primarily determines the kinetics, is the reaction of DPPH with PPF to produce DPPH-H and the PPF radical. The rate constant was found to be 31.8, 207, and 908 M(-1) s(-1) at pH 6.4, 7.4, and 8.4, respectively. The pH dependence is indicative of a higher reactivity of the phenolate form of PPF. Then, PPF radicals combine to form dipropofol, which is quickly oxidized to PPFDQ by the remaining DPPH . This reaction scheme is corroborated by numerical simulations of the kinetics. In the course of this study we also disclosed an unexpected effect, the photochemical degradation of PPFDQ. The need to compare antioxidants on a kinetics basis is again emphasized. In our hands, PPF presents a significantly weaker reactivity than Trolox.
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Affiliation(s)
- Ouided Friaa
- Université Pierre et Marie Curie-Paris 6, UMR 7033, BIOMOCETI, F-75005 Paris, France
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Fiedor J, Fiedor L, Haessner R, Scheer H. Cyclic endoperoxides of β-carotene, potential pro-oxidants, as products of chemical quenching of singlet oxygen. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2005; 1709:1-4. [PMID: 15993379 DOI: 10.1016/j.bbabio.2005.05.008] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2005] [Revised: 05/16/2005] [Accepted: 05/18/2005] [Indexed: 11/27/2022]
Abstract
Photoprotection by carotenoids is generally considered to be based on the photophysical quenching of triplets and singlet oxygen. There is also accumulating evidence of an alternative, chemical quenching of triplets and singlet oxygen by carotenoids. We report the identification of relatively stable cyclic mono- and diendoperoxides as first products of such an alternative reaction. Nevertheless, these species remain reactive and in the dark cause autooxidation of beta-carotene in our model system. Their formation could explain the intriguing pro-oxidant and cytotoxic activity of carotenoids.
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Affiliation(s)
- Joanna Fiedor
- Department of Plant Physiology and Biochemistry, Faculty of Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387 Cracow, Poland.
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Heyne B, Brault D, Fontaine-Aupart MP, Kohnen S, Tfibel F, Mouithys-Mickalad A, Deby-Dupont G, Hans P, Hoebeke M. Reactivity towards singlet oxygen of propofol inside liposomes and neuronal cells. Biochim Biophys Acta Gen Subj 2005; 1724:100-7. [PMID: 15878638 DOI: 10.1016/j.bbagen.2005.04.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2004] [Revised: 03/30/2005] [Accepted: 04/01/2005] [Indexed: 11/21/2022]
Abstract
Singlet oxygen (1O2), a reactive oxygen species, has been found to be implicated in many cellular events and pathological disorders. Herein, we investigated the reactivity of 1O2 towards the anaesthetic agent propofol (PPF) encapsulated within DMPC liposomes. By time resolved luminescence, the rate constant of 1O2 quenching by PPF was evaluated, depending on the location of the sensitizer, with following values: 1.35+/-0.05x10(7) M(-1) s(-1) for deuteroporphyrin (as embedded source) and 0.8+/-0.04x10(7) M(-1) s(-1) for uroporphyrin (as external source), respectively. The nature of the oxidation product, resulting from the reaction of 1O2 with PPF, was determined using absorption and HPLC techniques. Finally, the in vitro protective effect of PPF towards the 1O2-induced neuronal cell toxicity was evaluated in terms of cell viability.
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Affiliation(s)
- B Heyne
- Department of Physics, Institute of Physics (B5), Biomedical Spectroscopy (C.O.R.D.), University of Liège, Allée du 6 Août, 17, 4000 Liège, Belgium
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Cavalieri F, Padella F, Cataldo F. Mechanochemical surface activation of ground tire rubber by solid-state devulcanization and grafting. J Appl Polym Sci 2003. [DOI: 10.1002/app.12829] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Abstract
BHT is the recognized name in the cosmetics industry for butylated hydroxytoluene. BHT is used in a wide range of cosmetic formulations as an antioxidant at concentrations from 0.0002% to 0.5%. BHT does penetrate the skin, but the relatively low amount absorbed remains primarily in the skin. Oral studies demonstrate that BHT is metabolized. The major metabolites appear as the carboxylic acid of BHT and its glucuronide in urine. At acute doses of 0.5 to 1.0 g/kg, some renal and hepatic damage was seen in male rats. Short-term repeated exposure to comparable doses produced hepatic toxic effects in male and female rats. Subchronic feeding and intraperitoneal studies in rats with BHT at lower doses produced increased liver weight, and decreased activity of several hepatic enzymes. In addition to liver and kidney effects, BHT applied to the skin was associated with toxic effects in lung tissue. BHT was not a reproductive or developmental toxin in animals. BHT has been found to enhance and to inhibit the humoral immune response in animals. BHT itself was not generally considered genotoxic, although it did modify the genotoxicity of other agents. BHT has been associated with hepatocellular and pulmonary adenomas in animals, but was not considered carcinogenic and actually was associated with a decreased incidence of neoplasms. BHT has been shown to have tumor promotion effects, to be anticarcinogenic, and to have no effect on other carcinogenic agents, depending on the target organ, exposure parameters, the carcinogen, and the animal tested. Various mechanism studies suggested that BHT toxicity is related to an electrophillic metabolite. In a predictive clinical test, 100% BHT was a mild irritant and a moderate sensitizer. In provocative skin tests, BHT (in the 1% to 2% concentration range) produced positive reactions in a small number of patients. Clinical testing did not find any depigmentation associated with dermal exposure to BHT, although a few case reports of depigmentation were found. The Cosmetic Ingredient Review Expert Panel recognized that oral exposure to BHT was associated with toxic effects in some studies and was negative in others. BHT applied to the skin, however, appears to remain in the skin or pass through only slowly and does not produce systemic exposures to BHT or its metabolites seen with oral exposures. Although there were only limited studies that evaluated the effect of BHT on the skin, the available studies, along with the case literature, demonstrate no significant irritation, sensitization, or photosensitization. Recognizing the low concentration at which this ingredient is currently used in cosmetic formulations, it was concluded that BHT is safe as used in cosmetic formulations.
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Barros MP, Pinto E, Colepicolo P, Pedersén M. Astaxanthin and peridinin inhibit oxidative damage in Fe(2+)-loaded liposomes: scavenging oxyradicals or changing membrane permeability? Biochem Biophys Res Commun 2001; 288:225-32. [PMID: 11594777 DOI: 10.1006/bbrc.2001.5765] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Astaxanthin and peridinin, two typical carotenoids of marine microalgae, and lycopene were incorporated in phosphatidylcholine multilamellar liposomes and tested as inhibitors of lipid oxidation. Contrarily to peridinin results, astaxanthin strongly reduced lipid damage when the lipoperoxidation promoters-H(2)O(2), tert-butyl hydroperoxide (t-ButOOH) or ascorbate-and Fe(2+):EDTA were added simultaneously to the liposomes. In order to check if the antioxidant activity of carotenoids was also related to their effect on membrane permeability, the peroxidation processes were initiated by adding the promoters to Fe(2+)-loaded liposomes (encapsulated in the inner aqueous solution). Despite that the rigidifying effect of carotenoids in membranes was not directly measured here, peridinin probably has decreased membrane permeability to initiators (t-ButOOH > ascorbate > H(2)O(2)) since its incorporation limited oxidative damage on iron-liposomes. On the other hand, the antioxidant activity of astaxanthin in iron-containing vesicles might be derived from its known rigidifying effect and the inherent scavenging ability.
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Affiliation(s)
- M P Barros
- Department of Botany, Stockholm University, SE-10691 Stockholm, Sweden.
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Salganik R, Dikalova A, Dikalov S, La D, Bulygina E, Stvolinsky S, Boldyrev A. Antioxidants Selectively Protecting Neurochemical Functions in Rats Overproducing Reactive Oxygen Species. ACTA ACUST UNITED AC 2001. [DOI: 10.1089/109454501750225686] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- R. Salganik
- University of North Carolina, Chapel Hill, North Carolina and Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - A. Dikalova
- Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - S. Dikalov
- Institute of Chemical Kinetics and Combustion, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - D. La
- University of North Carolina, Chapel Hill, North Carolina
| | - E. Bulygina
- M.V. Lomonosov Moscow State University, Moscow, Russia
| | - S. Stvolinsky
- Institute of Neurology, Russian Academy of Medical Sciences, Moscow, Russia
| | - A. Boldyrev
- M.V. Lomonosov Moscow State University, Moscow, Russia and Institute of Neurology, Russian Academy of Medical Sciences, Moscow, Russia
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Lebeau J, Furman C, Bernier JL, Duriez P, Teissier E, Cotelle N. Antioxidant properties of di-tert-butylhydroxylated flavonoids. Free Radic Biol Med 2000; 29:900-12. [PMID: 11063915 DOI: 10.1016/s0891-5849(00)00390-7] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Epidemiological evidence suggests an inverse relationship between dietary intake of flavonoids and cardiovascular risk. The biological activities of flavonoids are related to their antioxidative effects, but they also can be mutagenic, due to the prooxidant activity of the catechol pattern. To prevent these problems, we synthesized new flavonoids where one or two di-tert-butylhydroxyphenyl (DBHP) groups replaced catechol moiety at position 2 of the benzopyrane heterocycle. Two DBHP moieties can also be arranged in an arylidene structure or one DBHP fixed on a chalcone structure. Position 7 on the flavone and arylidene or position 4 on the chalcone was substituted by H, OCH(3), or OH. New structures were compared with quercetin and BHT in an LDL oxidation system induced by Cu(II) ions. Arylidenes and chalcones had the best activities (ED(50) = 0.86 and 0.21) compared with vitamin E, BHT, and quercetin (ED(50) = 10.0, 7. 4, and 2.3 microM). Activity towards stable free radical 1, 1-diphenyl-2-picryl-hydrazyl (DPPH) was measured by log Z and ECR(50) parameters. Synthesized flavones proved to be poor DPPH radical scavengers, the activity increasing with the number of DBHP units. In contrast, arylidenes and chalcones were stronger DPPH radical scavengers (log Z > 3, 0.3 < ECR(50) < 2.12) than BHT (log Z = 0.75, ECR(50) = 12.56) or quercetin (log Z = 2.76, ECR(50) = 0.43). Unlike quercetin, synthesized compounds neither chelated nor reduced copper, proving that these new flavonoids had no prooxidant activity in vitro.
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Affiliation(s)
- J Lebeau
- Laboratoire de Chimie Organique et Macromoléculaire, UPRESA 8009, 59655, Villeneuve d'Ascq, France
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Dubuisson ML, de Wergifosse B, Trouet A, Baguet F, Marchand-Brynaert J, Rees JF. Antioxidative properties of natural coelenterazine and synthetic methyl coelenterazine in rat hepatocytes subjected to tert-butyl hydroperoxide-induced oxidative stress. Biochem Pharmacol 2000; 60:471-8. [PMID: 10874121 DOI: 10.1016/s0006-2952(00)00359-2] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Coelenterazine (CLZn; 3, 7-dihydro-2-(p-hydroxybenzyl)-6-(p-hydroxyphenyl)-8-benzylimidazolo++ +[1 ,2-a]pyrazin-3-one), the substrate for bioluminescence reactions in many marine animals, is endowed with high antioxidant properties. This work investigated the antioxidative properties of CLZn in primary cultures of rat hepatocytes subjected to the oxidant tert-butyl hydroperoxide (t-BHP). Micromolar concentrations of CLZn increased survival and decreased lipid peroxidation in rat hepatocytes subjected for 6 hr to 2.5 x 10(-4) M t-BHP. However, the extent of protection was limited by a strong toxicity of CLZn (IC(50) = 6.9 x 10(-5) M). The presence of t-BHP increased the cellular toxicity of CLZn. Methyl coelenterazine (CLZm, 3, 7-dihydro-2-methyl-6-(p-hydroxyphenyl)-8 benzylimidazolo[1, 2-a]pyrazin-3-one), a synthetic analogue of CLZn, demonstrated excellent antioxidant properties, even at very low (3 x 10(-6) M) concentrations and was not toxic throughout most of its effective concentration range. CLZm proved far more effective than reference antioxidants such as Trolox C(R), alpha-tocopherol, BHT, and probucol. The assay of thiobarbituric reactive substances (TBARS) associated with cells and in the culture medium indicated that 10(-5) M CLZm provided a total protection against t-BHP-induced lipid peroxidation. This coelenterazine analogue could be used as a model compound for investigating the action mechanism of imidazolopyrazinones in mammalian hepatocytes.
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Affiliation(s)
- M L Dubuisson
- Unité;;-2 de Biologie Animale, Université Catholique de Louvain, Croix de Sud, 4-5, B-1348, Louvain-la-Neuve, Belgium.
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Edge R, McGarvey DJ, Truscott TG. The carotenoids as anti-oxidants--a review. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 1997; 41:189-200. [PMID: 9447718 DOI: 10.1016/s1011-1344(97)00092-4] [Citation(s) in RCA: 521] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Carotenoids are abundant in many fruits and vegetables and they play diverse roles in photobiology, photochemistry and medicine. This review concerns the reactivity of carotenoids with singlet oxygen and the interaction of carotenoids with a range of free radicals. Mechanisms associated with the anti- and pro-oxidant behaviour of carotenoids are discussed including carotenoid interactions with other anti-oxidants.
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Affiliation(s)
- R Edge
- Chemistry Department, Keele University, Staffs, UK
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