1
|
Iossi MR, Palú IA, Soares DM, Vieira WG, Alves LS, Stevani CV, Caitano CEC, Atum SVF, Freire RS, Dias ES, Zied DC. Metaprofiling of the Bacterial Community in Colonized Compost Extracts by Agaricus subrufescens. J Fungi (Basel) 2022; 8:jof8100995. [PMID: 36294560 PMCID: PMC9605601 DOI: 10.3390/jof8100995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 09/15/2022] [Accepted: 09/19/2022] [Indexed: 11/16/2022] Open
Abstract
It is well-known that bacteria and fungi play important roles in the relationships between mycelium growth and the formation of fruiting bodies. The sun mushroom, Agaricus subrufescens, was discovered in Brazil ca. 1960 and it has become known worldwide due to its medicinal and nutritional properties. This work evaluated the bacterial community present in mushroom-colonized compost extract (MCCE) prepared from cultivation of A. subrufescens, its dynamics with two different soaking times and the influence of the application of those extracts on the casing layer of a new compost block for A. subrufescens cultivation. MCCEs were prepared through initial submersion of the colonized compost for 1 h or 24 h in water followed by application on casing under semi-controlled conditions. Full-length 16S rRNA genes of 1 h and 24 h soaked MCCE were amplified and sequenced using nanopore technology. Proteobacteria, followed by Firmicutes and Planctomycetes, were found to be the most abundant phyla in both the 1 h and 24 h soaked MCCE. A total of 275 different bacterial species were classified from 1 h soaked MCCE samples and 166 species from 24 h soaked MCCE, indicating a decrease in the bacterial diversity with longer soaking time during the preparation of MCCE. The application of 24 h soaked MCCE provided increases of 25% in biological efficiency, 16% in precociousness, 53% in the number of mushrooms and 40% in mushroom weight compared to control. Further investigation is required to determine strategies to enhance the yield and quality of the agronomic traits in commercial mushroom cultivation.
Collapse
Affiliation(s)
- Matheus Rodrigo Iossi
- Programa de Pós-Graduação em Microbiologia Agropecuária, Faculdade de Ciências Agrárias e Veterinárias (FCAV), Universidade Estadual Paulista (UNESP), São Paulo 14884-900, Brazil
| | - Isabela Arruda Palú
- Faculdade de Ciências Agrárias e Tecnológicas (FCAT), Universidade Estadual Paulista (UNESP), São Paulo 17900-000, Brazil
| | - Douglas Moraes Soares
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo (USP), São Paulo 05508-220, Brazil
| | - Wagner G. Vieira
- Programa de Pós-Graduação em Microbiologia Agropecuária, Faculdade de Ciências Agrárias e Veterinárias (FCAV), Universidade Estadual Paulista (UNESP), São Paulo 14884-900, Brazil
| | - Lucas Silva Alves
- Programa de Pós-Graduação em Microbiologia Agropecuária, Faculdade de Ciências Agrárias e Veterinárias (FCAV), Universidade Estadual Paulista (UNESP), São Paulo 14884-900, Brazil
| | - Cassius V. Stevani
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo (USP), São Paulo 05508-220, Brazil
| | - Cinthia E. C. Caitano
- Programa de Pós-Graduação em Microbiologia Agropecuária, Faculdade de Ciências Agrárias e Veterinárias (FCAV), Universidade Estadual Paulista (UNESP), São Paulo 14884-900, Brazil
| | - Samir V. F. Atum
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo (USP), São Paulo 05508-220, Brazil
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo 05508-220, Brazil
| | - Renato S. Freire
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo (USP), São Paulo 05508-220, Brazil
| | - Eustáquio S. Dias
- Departamento de Biologia, Universidade Federal de Lavras (UFLA), Lavras 37200-900, Brazil
| | - Diego Cunha Zied
- Faculdade de Ciências Agrárias e Tecnológicas (FCAT), Universidade Estadual Paulista (UNESP), São Paulo 17900-000, Brazil
- Correspondence: or
| |
Collapse
|
2
|
Soares DMM, Procópio DP, Zamuner CK, Nóbrega BB, Bettim MR, de Rezende G, Lopes PM, Pereira ABD, Bechara EJH, Oliveira AG, Freire RS, Stevani CV. Fungal bioassays for environmental monitoring. Front Bioeng Biotechnol 2022; 10:954579. [PMID: 36091455 PMCID: PMC9452622 DOI: 10.3389/fbioe.2022.954579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 08/02/2022] [Indexed: 11/13/2022] Open
Abstract
Environmental pollutants are today a major concern and an intensely discussed topic on the global agenda for sustainable development. They include a wide range of organic compounds, such as pharmaceutical waste, pesticides, plastics, and volatile organic compounds that can be found in air, soil, water bodies, sewage, and industrial wastewater. In addition to impacting fauna, flora, and fungi, skin absorption, inhalation, and ingestion of some pollutants can also negatively affect human health. Fungi play a crucial role in the decomposition and cycle of natural and synthetic substances. They exhibit a variety of growth, metabolic, morphological, and reproductive strategies and can be found in association with animals, plants, algae, and cyanobacteria. There are fungal strains that occur naturally in soil, sediment, and water that have inherent abilities to survive with contaminants, making the organism important for bioassay applications. In this context, we reviewed the applications of fungal-based bioassays as a versatile tool for environmental monitoring.
Collapse
Affiliation(s)
- Douglas M. M. Soares
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Dielle P. Procópio
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
- Research Centre for Greenhouse Gas Innovation (RGCI-POLI-USP), University of São Paulo, São Paulo, Brazil
| | - Caio K. Zamuner
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Bianca B. Nóbrega
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Monalisa R. Bettim
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Gustavo de Rezende
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Pedro M. Lopes
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Arthur B. D. Pereira
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Etelvino J. H. Bechara
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Anderson G. Oliveira
- Department of Chemistry and Biochemistry, Yeshiva University, New York, NY, United States
| | - Renato S. Freire
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
- Research Centre for Greenhouse Gas Innovation (RGCI-POLI-USP), University of São Paulo, São Paulo, Brazil
| | - Cassius V. Stevani
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
- Research Centre for Greenhouse Gas Innovation (RGCI-POLI-USP), University of São Paulo, São Paulo, Brazil
- *Correspondence: Cassius V. Stevani,
| |
Collapse
|
3
|
Gothe ML, Silva KLC, Figueredo AL, Fiorio JL, Rozendo J, Manduca B, Simizu V, Freire RS, Garcia MAS, Vidinha P. Rhenium – A Tuneable Player in Tailored Hydrogenation Catalysis. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100459] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Maitê L. Gothe
- Institute of Chemistry University of Sao Paulo Av Prof Lineu Prestes 748 Sao Paulo 05508-000 Brazil
| | - Karla L. C. Silva
- Institute of Chemistry University of Sao Paulo Av Prof Lineu Prestes 748 Sao Paulo 05508-000 Brazil
| | - Adolfo L. Figueredo
- Nucleus of Education and Research in Oil and Gas Department of Chemical Engineering Federal University of Rio Grande do Norte Av Senador Salgado Filho Natal 59078-970 Brazil
| | - Jhonatan L. Fiorio
- Institute of Chemistry University of Sao Paulo Av Prof Lineu Prestes 748 Sao Paulo 05508-000 Brazil
| | - Jennifer Rozendo
- Institute of Chemistry University of Sao Paulo Av Prof Lineu Prestes 748 Sao Paulo 05508-000 Brazil
| | - Bruno Manduca
- Institute of Chemistry University of Sao Paulo Av Prof Lineu Prestes 748 Sao Paulo 05508-000 Brazil
| | - Vinício Simizu
- Institute of Chemistry University of Sao Paulo Av Prof Lineu Prestes 748 Sao Paulo 05508-000 Brazil
| | - Renato S. Freire
- Institute of Chemistry University of Sao Paulo Av Prof Lineu Prestes 748 Sao Paulo 05508-000 Brazil
| | - Marco A. S. Garcia
- Department of Chemistry Federal University of Maranhao Avenida dos Portugueses 1966 São Luís 65080-805 Brazil
| | - Pedro Vidinha
- Institute of Chemistry University of Sao Paulo Av Prof Lineu Prestes 748 Sao Paulo 05508-000 Brazil
| |
Collapse
|
4
|
Cordeiro DS, Cassio FL, Ciccotti L, Hewer TLR, Corio P, Freire RS. Photocatalytic activity of Pr-modified TiO2 for the degradation of bisphenol A. SN Appl Sci 2021. [DOI: 10.1007/s42452-021-04284-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
AbstractPraseodymium doped TiO2 nanoparticles were successfully prepared by the sol–gel method and characterized by X-ray powder diffraction, N2 adsorption–desorption isotherm, and UV–vis spectroscopy. The effects of the dopant on the crystallite size, specific surface area, average pore diameter, pore volume, and bandgap energy were investigated. The photocatalytic activity of the catalysts was evaluated by bisphenol A degradation and mineralization, which is a representative endocrine disruptor. Furthermore, under visible light irradiation the Pr-modified TiO2 photocatalysts exhibited higher photocatalytic efficiency than unmodified TiO2. When praseodymium was loaded (1.0–5.0%) onto the surface of TiO2, the rates of degradation and mineralization were increased 3–5 times.
Collapse
|
5
|
Ventura FF, Mendes LF, Oliveira AG, Bazito RC, Bechara EJH, Freire RS, Stevani CV. Evaluation of Phenolic Compound Toxicity Using a Bioluminescent Assay with the Fungus Gerronema viridilucens. Environ Toxicol Chem 2020; 39:1558-1565. [PMID: 32367555 DOI: 10.1002/etc.4740] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 03/18/2020] [Accepted: 04/30/2020] [Indexed: 06/11/2023]
Abstract
Basidiomycetes (phylum Basidiomycota) are filamentous fungi characterized by the exogenous formation of spores on a club-shaped cell called a basidium that are often formed on complex fruiting bodies (mushrooms). Many basidiomycetes serve an important role in recycling lignocellulosic material to higher trophic levels, and some show symbiotic relationships with plants. All known bioluminescent fungi are mushroom-forming basidiomycetes in the order Agaricales. Hence, the disruption of the basidiomycete community can entirely compromise the carbon cycle in nature from fungi to higher trophic levels. The fungus Gerronema viridilucens was used in the present study to investigate the toxicity of a phenolic compound series based on the inhibition of its bioluminescence. The median effect concentration (EC50) obtained from curves of bioluminescence inhibition versus log [phenolic compound] showed that 2,4,6-trichlorophenol was the most toxic compound in the series. The log EC50 values of all phenolic compounds were then used for the prediction of their toxicity. The univariate correlation of log EC50 values obtained from 6 different phenolic compounds was stronger with the dissociation constant (pKa ) than with 1-octanol/water partition coefficient (KOW ). Nevertheless, the toxicity can be better predicted by using both parameters, suggesting that the phenol-driven uncoupling of fungus mitochondrial adenosine triphosphate synthesis is the origin of phenolic compound toxicity to the test fungus. Environ Toxicol Chem 2020;39:1558-1565. © 2020 SETAC.
Collapse
Affiliation(s)
- Fernanda F Ventura
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, São Paulo, Brazil
- Fundação Jorge Duprat Figueiredo de Segurança e Medicina do Trabalho, São Paulo, São Paulo, Brazil
| | - Luiz F Mendes
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, São Paulo, Brazil
- Bioativos Group, Santana do Parnaíba, São Paulo, Brazil
| | - Anderson G Oliveira
- Departamento de Oceanografia Física, Química e Geológica, Instituto Oceanográfico, Universidade de São Paulo, São Paulo, São Paulo, Brazil
| | - Reinaldo C Bazito
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, São Paulo, Brazil
| | - Etelvino J H Bechara
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, São Paulo, Brazil
| | - Renato S Freire
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, São Paulo, Brazil
| | - Cassius V Stevani
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, São Paulo, Brazil
| |
Collapse
|
6
|
de Sousa JS, Freire RS, Sousa FD, Radmacher M, Silva AFB, Ramos MV, Monteiro-Moreira ACO, Mesquita FP, Moraes MEA, Montenegro RC, Oliveira CLN. Double power-law viscoelastic relaxation of living cells encodes motility trends. Sci Rep 2020; 10:4749. [PMID: 32179816 PMCID: PMC7075927 DOI: 10.1038/s41598-020-61631-w] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 02/26/2020] [Indexed: 02/08/2023] Open
Abstract
Living cells are constantly exchanging momentum with their surroundings. So far, there is no consensus regarding how cells respond to such external stimuli, although it reveals much about their internal structures, motility as well as the emergence of disorders. Here, we report that twelve cell lines, ranging from healthy fibroblasts to cancer cells, hold a ubiquitous double power-law viscoelastic relaxation compatible with the fractional Kelvin-Voigt viscoelastic model. Atomic Force Microscopy measurements in time domain were employed to determine the mechanical parameters, namely, the fast and slow relaxation exponents, the crossover timescale between power law regimes, and the cell stiffness. These cell-dependent quantities show strong correlation with their collective migration and invasiveness properties. Beyond that, the crossover timescale sets the fastest timescale for cells to perform their biological functions.
Collapse
Affiliation(s)
- J S de Sousa
- Departamento de Física, Universidade Federal do Ceará, 60455-970, Fortaleza, Ceará, Brazil.
| | - R S Freire
- Central Analítica, Universidade Federal do Ceará, 60455-970, Fortaleza, Ceará, Brazil
| | - F D Sousa
- Departamento de Física, Universidade Federal do Ceará, 60455-970, Fortaleza, Ceará, Brazil
| | - M Radmacher
- Institute of Biophysics, University of Bremen, Otto-Hahn Allee 1, 28359, Bremen, Germany
| | - A F B Silva
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, 60440-554, Fortaleza, Ceará, Brazil
| | - M V Ramos
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, 60440-554, Fortaleza, Ceará, Brazil
| | - A C O Monteiro-Moreira
- Centro de Biologia Experimental, Universidade de Fortaleza, 60811-905, Fortaleza, Ceará, Brazil
| | - F P Mesquita
- Núcleo de Pesquisa e Desenvolvimento de Medicamentos, Universidade Federal do Ceará, 60430-275, Fortaleza, Ceará, Brazil
| | - M E A Moraes
- Núcleo de Pesquisa e Desenvolvimento de Medicamentos, Universidade Federal do Ceará, 60430-275, Fortaleza, Ceará, Brazil
| | - R C Montenegro
- Núcleo de Pesquisa e Desenvolvimento de Medicamentos, Universidade Federal do Ceará, 60430-275, Fortaleza, Ceará, Brazil
| | - C L N Oliveira
- Departamento de Física, Universidade Federal do Ceará, 60455-970, Fortaleza, Ceará, Brazil
| |
Collapse
|
7
|
Abstract
A simple colorimetric immunoassay for quantification of human immunoglobulin G (hIgG) is herein described. The assay is based on the aggregation inhibition of silver nanoparticles (AgNP) functionalized with hIgG antibody (anti-hIgG) on the surface. The aggregation is measured in terms of attenuance values ratio at 400 and 530 nm (A400/A530). A linear response between A400/A530 and hIgG concentration is observed in the range 25 - 200 ng mL-1, and the detection limit is estimated as 11 ng mL-1 hIgG.
Collapse
Affiliation(s)
- Daniela M Batistela
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo (USP)
| | - Cassius V Stevani
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo (USP)
| | - Renato S Freire
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo (USP)
| |
Collapse
|
8
|
de Siqueira RJB, Ribeiro-Filho HV, Freire RS, Cosker F, Freire WBS, Vasconcelos-Silva AA, Soares MA, Lahlou S, Magalhães PJC. (-)-α-Bisabolol inhibits preferentially electromechanical coupling on rat isolated arteries. Vascul Pharmacol 2014; 63:37-45. [PMID: 25128618 DOI: 10.1016/j.vph.2014.06.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Revised: 06/09/2014] [Accepted: 06/26/2014] [Indexed: 01/23/2023]
Abstract
Previous findings enable us to hypothesize that (-)-α-bisabolol acts as inhibitor of voltage-dependent Ca(2+) channels in smooth muscle. The current study was aimed at consolidating such hypothesis through the recording of isometric tension, measurement of intracellular Ca(2+) as well as discovery of channel target using in silico analysis. In rat aortic rings, (-)-α-bisabolol (1-1000 µM) relaxed KCl- and phenylephrine-elicited contractions, but the IC50 differed significantly (22.8 [17.6-27.7] and 200.7 [120.4-334.6] µM, respectively). The relaxation of phenylephrine contractions remained unaffected by l-NAME, indomethacin, 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one, tetraethylammonium, glibenclamide or KT-5720. Under Ca(2+)-free conditions, (-)-α-bisabolol did not alter the contractions evoked by phenylephrine or caffeine whereas it reduced those evoked by CaCl2 in KCl-, but not in PHE-stimulated preparations. Furthermore, it did not significantly alter the contractions evoked by phorbol 12,13-dibutyrate or induced by the extracellular Ca(2+) restoration in cyclopiazonic acid-treated preparations. In mesenteric rings loaded with Fluo-4 AM, (-)-α-bisabolol blunted the tension and the cytosolic levels of Ca(2+) in response to K(+) but not to norepinephrine. Silico docking analysis of the Cavβ2a subunit of voltage-dependent Ca(2+) channel indicated putative docking sites for (-)-α-bisabolol. These findings reinforce the ability of (-)-α-bisabolol to inhibit preferentially contractile responses evoked by Ca(2+) influx through voltage-dependent Ca(2+) channels.
Collapse
Affiliation(s)
- R J B de Siqueira
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil.
| | - H V Ribeiro-Filho
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - R S Freire
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - F Cosker
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - W B S Freire
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - A A Vasconcelos-Silva
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - M A Soares
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - S Lahlou
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - P J C Magalhães
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| |
Collapse
|
9
|
|
10
|
Pedrosa VA, Paixão TR, Freire RS, Bertotti M. Studies on the electrochemical behavior of a cystine self-assembled monolayer modified electrode using ferrocyanide as a probe. J Electroanal Chem (Lausanne) 2007. [DOI: 10.1016/j.jelechem.2006.12.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
11
|
|
12
|
|
13
|
|
14
|
|
15
|
Mendes RK, Freire RS, Fonseca CP, Neves S, Kubota LT. Characterization of self-assembled thiols monolayers on gold surface by electrochemical impedance spectroscopy. J BRAZIL CHEM SOC 2004. [DOI: 10.1590/s0103-50532004000600011] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
|
16
|
|
17
|
de Carvalho RM, Freire RS, Rath S, Kubota LT. Effects of EDTA on signal stability during electrochemical detection of acetaminophen. J Pharm Biomed Anal 2004; 34:871-8. [PMID: 15019021 DOI: 10.1016/j.jpba.2003.11.005] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2003] [Revised: 10/24/2003] [Accepted: 11/25/2003] [Indexed: 11/21/2022]
Abstract
The use of EDTA in the medium to avoid the passivation of a solid electrode during electrochemical analysis of acetaminophen is presented in this work. The performance of this system was investigated with respect to pH, applied potential and supporting electrolyte concentration. The major advantage in using EDTA in the supporting electrolyte is the significant increase in sensitivity, precision and stability of the measurements, when compared to the system in absence of the chelating agent. The sensitivity increases 5.5 times (21.5 and 3.9 mA l mol(-1) in the presence and the absence of EDTA, respectively), the repeatability (n=20) is 3.5 times better, expressed by within-run-precision of 4.0% for 6.0 x 10(-5) mol l(-1) acetaminophen in the presence of EDTA while, in its absence, the within-run-precision was higher than 14%. Moreover, the system showed excellent stability, allowing more than 120 measurements with no significant changes.
Collapse
|
18
|
Freire RS, Ferreira MM, Durán N, Kubota LT. Dual amperometric biosensor device for analysis of binary mixtures of phenols by multivariate calibration using partial least squares. Anal Chim Acta 2003. [DOI: 10.1016/s0003-2670(03)00414-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
19
|
Santos AS, Freire RS, Kubota LT. Highly stable amperometric biosensor for ethanol based on Meldola's blue adsorbed on silica gel modified with niobium oxide. J Electroanal Chem (Lausanne) 2003. [DOI: 10.1016/s0022-0728(03)00186-4] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
20
|
|
21
|
Freire RS, Pessoa CA, Mello LD, Kubota LT. Direct electron transfer: an approach for electrochemical biosensors with higher selectivity and sensitivity. J BRAZIL CHEM SOC 2003. [DOI: 10.1590/s0103-50532003000200008] [Citation(s) in RCA: 159] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
22
|
Freire RS, Kubota LT. Electrochemical behavior of the bis(2,2'-bipyridyl)copper(II) complex immobilized on a self-assembled monolayer modified electrode for L-ascorbic acid detection. Analyst 2002; 127:1502-6. [PMID: 12475042 DOI: 10.1039/b205814f] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Modification of a gold electrode has been achieved by immobilizing a bis(2,2'-bipyridyl)copper(II) complex in a self-assembled monolayer (SAM) of 3-mercaptopropionic acid. The electrostatic interaction of the negatively charged SAM with a di-positive copper complex allowed the attachment. The modified electrode exhibited excellent redox behavior. The dependence of the modified electrode response was investigated in terms of pH, supporting electrolyte and ionic strength. Moreover, it showed good electrocatalytic activity for ascorbic acid oxidation, allowing convenient quantification at levels down to 8.1 x 10(-8) mol l(-1). The [Cu(bipy)2]/SAM modified electrode under optimized operational conditions (PIPES buffer 0.01 mol l(-1) at pH 6.8 and 200 mV vs. SCE) presented a linear response range between 1.0 micromol l(-1) and 100.0 micromol l(-1) for ascorbic acid. This modified electrode also presented an excellent repeatability, showing a relative standard deviation of 2.1% for a series of 12 successive measurements of a 5.0 micromol l(-1) ascorbic acid solution. Furthermore, the electroactivity was maintained over a long period (e.g., 92% after 100 determinations).
Collapse
Affiliation(s)
- Renato S Freire
- Instituto de Química, Universidade Estadual de Campinas-UNICAMP, Campinas/SP CP 6154 Brazil
| | | |
Collapse
|
23
|
|
24
|
Freire RS, Durán N, Kubota LT. Electrochemical biosensor-based devices for continuous phenols monitoring in environmental matrices. J BRAZIL CHEM SOC 2002. [DOI: 10.1590/s0103-50532002000400008] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
25
|
Freire RS, Duran N, Kubota LT. Development of a laccase-based flow injection electrochemical biosensor for the determination of phenolic compounds and its application for monitoring remediation of Kraft E1 paper mill effluent. Anal Chim Acta 2002. [DOI: 10.1016/s0003-2670(02)00417-8] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
26
|
Freire RS, Thongngamdee S, Durán N, Wang J, Kubota LT. Mixed enzyme (laccase/tyrosinase)-based remote electrochemical biosensor for monitoring phenolic compounds. Analyst 2002. [DOI: 10.1039/b110011d] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
27
|
Abstract
The degradation of Kraft E1 pulp mill effluent was studied by four different ozonization oxidation systems (O3/pH3, O3/pH11, O3/pH11/H2O2, O3/pH11/UV). The investigation was focused on the reduction of total organic carbon (TOC), total phenols, color and acute toxicity (monitoring by inhibition of Escherichia coli respiration). For a reaction time of 90 minutes, the O3/pH11/UV was the most effective process for decoloration (45%). The O3/pH11/H2O2, O3/pH11/UV and O3/pH11 processes showed the best results for total phenols reduction (approximately/= 90%). None of the studied processes showed a significant TOC reduction. The O3/pH11/UV and O3/pH11 processes were effective for the acute toxicity reduction. Different kinetic parameters were also determined in order to quantify the reactivity of the effluent towards the applied oxidation systems.
Collapse
Affiliation(s)
- R S Freire
- Biological Chemistry Laboratory - Instituto de Química, Universidade Estadual de Campinas UNICAMP, Campinas/SP, Brazil
| | | | | |
Collapse
|
28
|
Pelegrini RT, Freire RS, Duran N, Bertazzoli R. Photoassisted electrochemical degradation of organic pollutants on a DSA type oxide electrode: process test for a phenol synthetic solution and its application for the E1 bleach Kraft mill effluent. Environ Sci Technol 2001; 35:2849-2853. [PMID: 11452621 DOI: 10.1021/es001784j] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In this paper, the performance of a photoassisted electrolysis process, for the degradation of organic pollutants, is investigated. Results obtained in this work have shown that the thermally prepared anode of titanium, coated with 70TiO2/30RuO2, exhibits photoactivity and may be used for the treatment of effluents. A synthetic phenol aqueous solution and a real paper mill industry effluent were treated. Kinetic analysis showed a synergetic effect of electrolysis and photocatalysis and degradation rates are an order of magnitude greater than the sum of the results reached by using both processes individually. Using a 125 W mercury bulb and 20 mA cm-2, the phenol concentration decayed 85% in 90 min and 70% reduction of TOC was obtained. In the application of the treatment process for the degradation of the E1 bleach Kraft mill effluent, total phenols were practically eliminated in a short period of processing time, and color, usually resistant to biological treatment, was reduced to 10% from its initial value measured in terms of absorbance. Reductions of AOX, COD, and BOD by 25%, 30%, and 35%, respectively, were also observed.
Collapse
Affiliation(s)
- R T Pelegrini
- Faculdade de Engenharia Mecânica, Universidade Estadual de Campinas, Caixa Postal 6122-13083-970, Campinas, SP, Brazil
| | | | | | | |
Collapse
|
29
|
de Moraes SG, Freire RS, Durán N. Degradation and toxicity reduction of textile effluent by combined photocatalytic and ozonation processes. Chemosphere 2000; 40:369-373. [PMID: 10665401 DOI: 10.1016/s0045-6535(99)00239-8] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
To minimize the environmental impact of textile effluents, mainly related to their high coloration and the presence of toxic or carcinogenic reactive dyes, the efficiency of photochemical and ozonation processes, applied in the form of isolated and combined procedures, were evaluated. The investigation was focused on the reduction of total organic carbon content (TOC), color and acute toxicity (monitoring by inhibition of Escherichia coli respiration). For a reaction time of 60 min, the anatase TiO2-assisted photocatalytic process produces color and TOC reduction of about 90% and 50%, respectively. Meanwhile, the ozonation process gives a decolorization of about 60% but negligible TOC reduction. When the processes were applied in a simultaneous form, the decolorization was almost complete and the TOC reduction was higher than 60%. The three treatments studied yield an acute toxicity reduction of around 50%.
Collapse
Affiliation(s)
- S G de Moraes
- Biological Chemistry Laboratory, Universidade Estadual de Campinas, Brazil.
| | | | | |
Collapse
|
30
|
Kunz A, Freire RS, Rohwedder JJR, Duran N, Mansilla H, Rodriguez J. Construção e otimização de um sistema para produção e aplicação de ozônio em escala de laboratório. QUIM NOVA 1999. [DOI: 10.1590/s0100-40421999000300022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
|
31
|
|
32
|
|