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Braun WA, Horn BC, Hoehne L, Stülp S, Rosa MBDA, Hilgemann M. Poly(methylene blue)-modified electrode for indirect electrochemical sensing of OH radicals and radical scavengers. AN ACAD BRAS CIENC 2017; 89:1381-1389. [PMID: 28813104 DOI: 10.1590/0001-3765201720160833] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 03/24/2017] [Indexed: 02/08/2023] Open
Abstract
A new modified electrode for indirect sensing of OH· and radical scavengers was described. The electrochemical polymerization of methylene blue in aqueous solutions and the properties of the resulting films on a glassy carbon electrode were carried out using cyclic voltammetry. A surface coverage of 1.11 × 109mol cm2 was obtained, revealing a complete surface coverage of the polymeric film on the electrode surface. OH· was able to destroy the poly(methylene blue) film by exposure to a Fenton solution. The loss of the electrochemical signal of the residual polymeric film attached to the electrode surface was related to the extent of its dissolution. The applicability of the sensor was demonstrated by evaluating the OH radical scavenging effect on different concentrations of ascorbic acid. The obtained radical scavenging capacity were 31.4%, 55.7%, 98.9% and 65.7% for the ascorbic acid concentrations of 5, 10, 30 and 50 mM, respectively.
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Affiliation(s)
- Walter A Braun
- Centro de Ciências Exatas e Tecnológicas, Centro Universitário UNIVATES, Avenida Avelino Talini, 171, 95914-014 Lajeado, RS, Brazil
| | - Bruna C Horn
- Centro de Ciências Exatas e Tecnológicas, Centro Universitário UNIVATES, Avenida Avelino Talini, 171, 95914-014 Lajeado, RS, Brazil
| | - Lucélia Hoehne
- Centro de Ciências Exatas e Tecnológicas, Centro Universitário UNIVATES, Avenida Avelino Talini, 171, 95914-014 Lajeado, RS, Brazil
| | - Simone Stülp
- Centro de Ciências Exatas e Tecnológicas, Centro Universitário UNIVATES, Avenida Avelino Talini, 171, 95914-014 Lajeado, RS, Brazil
| | - Marcelo B DA Rosa
- Universidade Federal de Santa Maria, Departamento de Química, Avenida Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
| | - Maurício Hilgemann
- Centro de Ciências Exatas e Tecnológicas, Centro Universitário UNIVATES, Avenida Avelino Talini, 171, 95914-014 Lajeado, RS, Brazil
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Liu S, Zhao J, Zhang K, Yang L, Sun M, Yu H, Yan Y, Zhang Y, Wu L, Wang S. Dual-emissive fluorescence measurements of hydroxyl radicals using a coumarin-activated silica nanohybrid probe. Analyst 2017; 141:2296-302. [PMID: 26958658 DOI: 10.1039/c5an02261d] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
This work reports a novel dual-emissive fluorescent probe based on dye hybrid silica nanoparticles for ratiometric measurement of the hydroxyl radical (˙OH). In the probe sensing system, the blue emission of coumarin dye (coumarin-3-carboxylic acid, CCA) immobilized on the nanoparticle surface is selectively enhanced by ˙OH due to the formation of a coumarin hydroxylation product with strong fluorescence, whereas the emission of red fluorescent dye encapsulated in the silica nanoparticle is insensitive to ˙OH as a self-referencing signal, and so the probe provides a good quantitative analysis based on ratiometric fluorescence measurement with a detection limit of 1.65 μM. Moreover, the probe also shows high selectivity for ˙OH determination against metal ions, other reactive oxygen species and biological species. More importantly, it exhibits low cytotoxicity and high biocompatibility in living cells, and has been successfully used for cellular imaging of ˙OH, showing its promising application for monitoring of intracellular ˙OH signaling events.
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Affiliation(s)
- Saisai Liu
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China. and Department of Materials Science and Engineering, University of Science & Technology of China, Hefei, Anhui 230026, China and State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - Jun Zhao
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China. and State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - Kui Zhang
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China. and State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - Lei Yang
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, NC 27599, USA
| | - Mingtai Sun
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China. and State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - Huan Yu
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China. and State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - Yehan Yan
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China. and State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - Yajun Zhang
- Key Laboratory of Ion Beam Bioengineering, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - Lijun Wu
- Key Laboratory of Ion Beam Bioengineering, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - Suhua Wang
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China. and State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, China
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Coradini K, Lima FO, Oliveira CM, Chaves PS, Athayde ML, Carvalho LM, Beck RCR. Co-encapsulation of resveratrol and curcumin in lipid-core nanocapsules improves their in vitro antioxidant effects. Eur J Pharm Biopharm 2014; 88:178-85. [PMID: 24780440 DOI: 10.1016/j.ejpb.2014.04.009] [Citation(s) in RCA: 119] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 04/02/2014] [Accepted: 04/04/2014] [Indexed: 12/15/2022]
Abstract
Resveratrol and curcumin are natural antioxidants found in the human diet that have been used in the prevention and treatment of different diseases associated with oxidative stress. Aiming to improve the antioxidant effects of resveratrol and curcumin, lipid-core nanocapsules containing the combination of both polyphenols were developed. Physicochemical characteristics were evaluated and compared to the formulations containing each polyphenol individually. Co-encapsulation did not influence nanotechnological characteristics, and all formulations presented mean diameter around 200 nm, low polydispersity index, and encapsulation efficiency close to 100%. Nanoencapsulation increases the photostability of resveratrol and curcumin, and co-encapsulation improves resveratrol photostability. The in vitro antioxidant activity of polyphenols against HO radicals was enhanced by nanoencapsulation, and a better effect was observed after their co-nanoencapsulation. Also, nanocapsules exhibited controlled release profile, for both polyphenols. The results showed that the strategy to co-encapsulate resveratrol and curcumin is a promising approach to improve the performance of medicines used to prevent and treat diseases associated with oxidative stress.
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Affiliation(s)
- K Coradini
- Programa de Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - F O Lima
- Departamento de Química, Universidade Federal de Santa Maria (UFSM), Santa Maria, Brazil
| | - C M Oliveira
- Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - P S Chaves
- Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - M L Athayde
- Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal de Santa Maria (UFSM), Santa Maria, Brazil
| | - L M Carvalho
- Departamento de Química, Universidade Federal de Santa Maria (UFSM), Santa Maria, Brazil
| | - R C R Beck
- Programa de Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil.
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Dal Prá V, Dolwitsch CB, da Silveira GD, Porte L, Frizzo C, Tres MV, Mossi V, Mazutti MA, do Nascimento PC, Bohrer D, de Carvalho LM, Viana C, da Rosa MB. Supercritical CO2 extraction, chemical characterisation and antioxidant potential of Brassica oleracea var capitata against HO·, O2(·-) and ROO·. Food Chem 2013; 141:3954-9. [PMID: 23993571 DOI: 10.1016/j.foodchem.2013.06.098] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Revised: 06/19/2013] [Accepted: 06/24/2013] [Indexed: 11/30/2022]
Abstract
In this work were extracted bioactive compounds from Brassica oleracea var capitata using supercritical CO2 and evaluated the antioxidant potential of the extracts. Five extractions were accomplished to investigate the influence of pressure (10-25 MPa) and temperature (20-60 °C) in the extraction yield, chemical composition and antioxidant potential towards peroxyl, superoxide and hydroxyl radicals. The highest extraction yield was obtained at 60 °C and 25 MPa, which was 0.47 wt% (run 2). In the characterisation of the extracts obtained was possible the identification of sulforaphane and iberin nitrile that present known biological properties. The extracts of all runs presented antioxidant activities towards the three radicals, but the highest activities for all radicals were using the extracts obtained in the run 2. The use of supercritical CO2 extraction to obtain bioactive compounds of B. oleracea var capitata showed to be a promising alternative to conventional extraction methods, since allowed the extraction of compounds with scientific and industrial interest.
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Affiliation(s)
- Valéria Dal Prá
- Post-Graduate Program in Pharmaceutical Sciences, Federal University of Santa Maria, Camobi Campus, Santa Maria, RS 97105-900, Brazil
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