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José de Arruda E, Biasotto G, Beppu MM, Monteiro FJ, Granja PL, Rangel M, Leite A, Cabrini I, Santos T, Gonçalves DA, Neitzke Abreu HC. Nano-encapsulated Cu(II) complex as a promising insecticidal for Aedes aegypti (Diptera: Culicidae). Heliyon 2024; 10:e23198. [PMID: 38163248 PMCID: PMC10756974 DOI: 10.1016/j.heliyon.2023.e23198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 11/24/2023] [Accepted: 11/29/2023] [Indexed: 01/03/2024] Open
Abstract
Nanoparticle (NP) research is an area of scientific interest with high potential for application in biomedical, optical, and electronic fields. Due to their relatively large surface area compared to their mass, NPs can be more chemically reactive and change their reactive strength or other properties. NP-based drug delivery systems provide transport and an effective and controlled way to release the drugs. This work aimed to study the solubility and biological activity of nano-encapsulated copper metal complexes for the induction of toxicity and mortality in larvae of Aedes aegypti mosquitoes. After the nano-encapsulated metal complexes were prepared, the efficiency of this incorporation was determined by electron paramagnetic resonance, and toxicity bioassays were performed. The polymeric-based PLGA NPs encapsulating metal complexes exhibited high toxicity and specificity for target organisms (insect vectors, i.e., A. aegypti), with relatively less environmental impact and long-term control of their breeding.
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Affiliation(s)
- Eduardo José de Arruda
- Faculty of Exact Sciences and Technology (FACET), Federal University of Grande Dourados (UFGD), Dourados, MS, Brazil
| | - Glenda Biasotto
- Faculty of Exact Sciences and Technology (FACET), Federal University of Grande Dourados (UFGD), Dourados, MS, Brazil
| | - Marisa Masumi Beppu
- Faculty of Chemical Engineering (FEQ), University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Fernando Jorge Monteiro
- Institute for Research and Innovation in Health (i3S), University of Porto, Porto, Portugal
- Faculty of Engineering of the University of Porto (FEUP), Porto, Portugal
| | - Pedro L. Granja
- Institute for Research and Innovation in Health (i3S), University of Porto, Porto, Portugal
| | - Maria Rangel
- Associated Laboratory for Green Chemistry (LAQV)- Network for Chemistry and Technology (REQUIMTE), Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto, Porto, Portugal
| | - Andreia Leite
- LAQV-REQUIMTE, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Porto, Portugal
| | - Isaías Cabrini
- Faculty of Exact Sciences and Technology (FACET), Federal University of Grande Dourados (UFGD), Dourados, MS, Brazil
- Department of Animal Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Tiago Santos
- Institute for Research and Innovation in Health (i3S), University of Porto, Porto, Portugal
| | - Daniel A. Gonçalves
- Faculty of Exact Sciences and Technology (FACET), Federal University of Grande Dourados (UFGD), Dourados, MS, Brazil
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de Oliveira RH, Gonçalves DA, dos Reis DD. TiO 2/MWCNT/Nafion-Modified Glassy Carbon Electrode as a Sensitive Voltammetric Sensor for the Determination of Hydrogen Peroxide. Sensors (Basel) 2023; 23:7732. [PMID: 37765789 PMCID: PMC10534937 DOI: 10.3390/s23187732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 05/04/2023] [Accepted: 05/08/2023] [Indexed: 09/29/2023]
Abstract
In this work we describe a straightforward approach for creating a nanocomposite comprising multiwalled carbon nanotubes (MWCNTs) and titanium dioxide (TiO2) using the hydrothermal technique, which is then characterized by scanning electron microscope (SEM), energy-dispersive X-ray spectrometer (EDS), X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), and thermal gravimetric analysis (TGA) to assess its properties. Nafion is employed as a reticular agent for the nanocomposite on the glassy carbon electrode (GCE), creating the MWCNT/TiO2/Nafion/GCE system. The electrochemical behavior of the system was evaluated using cyclic voltammetry, revealing its remarkable electrocatalytic activity for detecting hydrogen peroxide in water. The developed sensor showcased a broad linear response range of 14.00 to 120.00 μM, with a low detection limit of 4.00 μM. This electrochemical sensor provides a simple and highly sensitive method for detecting hydrogen peroxide in aqueous solutions and shows promising potential for various real-world applications, particularly in H2O2 monitoring.
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Affiliation(s)
| | - Daniel A. Gonçalves
- Faculty of Exact Sciences and Technology, Federal University of Grande Dourados, Dourados 79804-970, MS, Brazil;
| | - Diogo Duarte dos Reis
- Institute of Physics, Federal University of Mato Grosso do Sul—UFMS, Campo Grande 79070-900, MS, Brazil;
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3
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Morassuti CY, F. Abelha T, Gonçalves DA, Oliveira SL, Caires ARL. Multienergy Calibration Applied for the Quantification of Polymer Concentration in Conjugated Polymer Nanoparticles. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c02201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Claudio Y. Morassuti
- Grupo de Óptica e Fotônica─GOF, Pós-graduação em Ciência dos Materiais, Universidade Federal de Mato Grosso do Sul─UFMS, 549Campo Grande, MS, Brazil
| | - Thais F. Abelha
- Grupo de Óptica e Fotônica─GOF, Pós-graduação em Ciência dos Materiais, Universidade Federal de Mato Grosso do Sul─UFMS, 549Campo Grande, MS, Brazil
| | - Daniel A. Gonçalves
- Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, Rodovia Dourados-Itahum, km 12, CEP 79804-970Dourados, MS, Brazil
| | - Samuel L. Oliveira
- Grupo de Óptica e Fotônica─GOF, Pós-graduação em Ciência dos Materiais, Universidade Federal de Mato Grosso do Sul─UFMS, 549Campo Grande, MS, Brazil
| | - Anderson R. L. Caires
- Grupo de Óptica e Fotônica─GOF, Pós-graduação em Ciência dos Materiais, Universidade Federal de Mato Grosso do Sul─UFMS, 549Campo Grande, MS, Brazil
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4
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Gonçalves DA, Estadulho GLD, Guima KE, Martins CA. Multi-electrode platform for selective electrochemical sensing: 3D-printed insulating plastic is turned into a five-electrodes chip. Talanta 2022; 250:123705. [PMID: 35759830 DOI: 10.1016/j.talanta.2022.123705] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 04/26/2022] [Revised: 06/13/2022] [Accepted: 06/16/2022] [Indexed: 10/17/2022]
Abstract
We report a method to turn a 3D-printed plastic piece into a five-electrodes chip for multiple analytes detection. A chip containing Pd, Ni, and Ru working electrodes is used to sense hydroquinone, acetaminophen, salicylic acid, and hydroxychloroquine at once. The analysis is sequentially achieved simply by changing the proper electrode connection, without changing mobile parts, neither adding reactants, nor electrolytes. This strategy is an alternative for low-cost selective electrochemical detection.
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Affiliation(s)
- Daniel A Gonçalves
- Faculty of Exact Sciences and Technology, Federal University of Grande Dourados, 79804-970, Dourados, MS, Brazil.
| | - Glinka L D Estadulho
- Institute of Physics, Universidade Federal de Mato Grosso do Sul, CP 549, 79070-900, Campo Grande, MS, Brazil
| | - Katia-Emiko Guima
- Institute of Physics, Universidade Federal de Mato Grosso do Sul, CP 549, 79070-900, Campo Grande, MS, Brazil
| | - Cauê A Martins
- Institute of Physics, Universidade Federal de Mato Grosso do Sul, CP 549, 79070-900, Campo Grande, MS, Brazil.
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Gonçalves DA, Carmo JS, Zanon LTS, Marangoni BS, Cena C, Camara GA, Donati GL, Trindade MAG. Simultaneous quantification of seven multi-class organic molecules by single-shot dilution differential pulse voltammetric calibration. Talanta 2022; 237:122975. [PMID: 34736697 DOI: 10.1016/j.talanta.2021.122975] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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: 08/03/2021] [Revised: 09/13/2021] [Accepted: 10/14/2021] [Indexed: 02/05/2023]
Abstract
The contamination of water sources by anthropogenic activities is a topic of growing interest in the scientific community. Therefore, robust analytical techniques for the determination and quantification of multiple substances are needed, which often require complex and time-consuming procedures. In this context, we describe a univariate calibration method to determine emerging multi-class contaminants in different water sources. The instrumental setup is composed of a lab-made glass electrochemical cell with three electrodes: Pt counter, Ag/AgCl reference, and BDD working electrodes. With this system, we were able to simultaneously quantify tert-butylhydroquinone, acetaminophen, estrone, sulfamethoxazole, enrofloxacin, caffeine, and ibuprofen by differential pulse voltammetry. Only two calibration solutions are required for the Single-shot Dilution Differential Pulse Voltammetric Calibration (SSD-DP-VC) method described here, which can significantly improve sample throughput. Two robust univariate calibration strategies were also applied and compared with SSD-DP-VC. The new method is simple, fast, and comparable with traditional calibration methods, showing similar precision and accuracy for all determinations evaluated.
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Affiliation(s)
- Daniel A Gonçalves
- Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, Rodovia Dourados-Itahum, km 12, CEP 79804-970, Dourados, MS, Brazil.
| | - Jéssica S Carmo
- Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, Rodovia Dourados-Itahum, km 12, CEP 79804-970, Dourados, MS, Brazil
| | - Layne Taynara S Zanon
- Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, Rodovia Dourados-Itahum, km 12, CEP 79804-970, Dourados, MS, Brazil
| | - Bruno S Marangoni
- Optics and Photonics Group, Institute of Physics, Federal University of Mato Grosso do Sul - UFMS, Brazil
| | - Cícero Cena
- Optics and Photonics Group, Institute of Physics, Federal University of Mato Grosso do Sul - UFMS, Brazil
| | - Giuseppe A Camara
- Institute of Chemistry/UFMS, Box 549, 79070-900, Campo Grande, MS, Brazil
| | - George L Donati
- Department of Chemistry, Wake Forest University, Salem Hall, Box 7486, Winston-Salem, NC, 27109, USA
| | - Magno A G Trindade
- Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, Rodovia Dourados-Itahum, km 12, CEP 79804-970, Dourados, MS, Brazil; Unesp, National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM), Institute of Chemistry, CEP 14800-900, Araraquara, SP, Brazil
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Maximiano EM, Gonçalves DA, Martins CA, Angnes L, Gomes RS, Trindade MAG. Simultaneous separation and electroanalysis in a single polydimethylsiloxane-based platform. Talanta 2021; 233:122514. [PMID: 34215129 DOI: 10.1016/j.talanta.2021.122514] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 03/25/2021] [Revised: 05/04/2021] [Accepted: 05/08/2021] [Indexed: 11/15/2022]
Abstract
Channel-based microfluidic devices integrating the separation step and detection system are key factors to expand microanalysis application. However, these devices still depend on macroscale external equipment for pre-treatment of the sample, separation, or detection. The integration of all steps in only one stage is critical to improving feasibility. Herein, we use a low-cost protocol to solve part of the challenge by designing a dual-mode system onto single polydimethylsiloxane (PDMS)-based platform - overall dimensions of 65 mm length × 20 mm width × 14 mm height and the inner diameter of 297±10 μm height × 605±19 μm width - for column-free separation and simultaneous detection. As a proof-of-concept, we used this all-in-one PDMS platform to separate - without the packet-based phase - and determine salicylic acid (SA) and caffeine (CAF) with a detection limit of 0.20 and 0.18 μmol L-1 and quantification limit of 0.70 and 0.60 μmol L-1 for SA and CAF, respectively. We separated the mixture using forced convection into a chemically treated microchannel while detecting the analytes in amperometric mode. Here, we report new insights into how integrating analytes separation and further electroanalysis into a single miniaturized device.
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Affiliation(s)
- Elizabete M Maximiano
- Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, Rodovia Dourados-Itahum, km 12, CEP 79804-970, Dourados, MS, Brazil
| | - Daniel A Gonçalves
- Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, Rodovia Dourados-Itahum, km 12, CEP 79804-970, Dourados, MS, Brazil
| | - Cauê A Martins
- Institute of Physics, Universidade Federal de Mato Grosso do Sul, CEP 79070-900, Campo Grande, MS, Brazil
| | - Lucio Angnes
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, CEP 05508-000, São Paulo, SP, Brazil
| | - Roberto S Gomes
- Department of Pharmaceutical Sciences, North Dakota State University, Fargo, ND, USA
| | - Magno A G Trindade
- Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, Rodovia Dourados-Itahum, km 12, CEP 79804-970, Dourados, MS, Brazil; Unesp, National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM), Institute of Chemistry, CEP 14800-900, Araraquara, SP, Brazil.
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7
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Sloop JT, Gonçalves DA, O'Brien LM, Carter JA, Jones BT, Donati GL. Evaluation of different approaches to applying the standard additions calibration method. Anal Bioanal Chem 2021; 413:1293-1302. [PMID: 33388844 DOI: 10.1007/s00216-020-03092-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 11/19/2020] [Accepted: 11/23/2020] [Indexed: 11/25/2022]
Abstract
The extrapolation approach, traditionally used with standard additions (SA), is compared with the alternative strategies of interpolation, reversed-axis, and normalization. The interpolation approach is based on employing twice the analytical signal recorded for the sample (ysam) to determine an unknown analyte concentration. In the reversed-axis strategy, x- and y-axes are swapped when building the SA calibration plot to facilitate uncertainty estimation. A new strategy, based on signal normalization using ysam, is also described and compared to the other approaches. Results from 3 instrumental methods, 396 sample replicates, 16 analytes, and 2 certified reference materials are included in this study. For most applications, all four SA approaches provide statistically similar trueness and precision. However, extrapolation and reversed-axis provide more consistent values (within narrower ranges) than the other strategies when employing inductively coupled plasma optical emission spectrometry (ICP OES). On the other hand, normalization provides better trueness for the less robust method of microwave-induced plasma OES (MIP OES), as it is capable of minimizing systematic errors associated with different points of the calibration curve. Normalization is particularly useful for quickly processing data, without the need for inspecting each individual calibration plot to identify outlying points. Reversed-axis and normalization are the most adequate approaches for SA applications involving MIP OES and ICP-based methods. In addition to providing similar accuracies to the traditional extrapolation approach, these strategies present the advantage of a simple uncertainty estimation, which can be easily calculated using commonly available software such as Microsoft Excel and R.
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Affiliation(s)
- John T Sloop
- Department of Chemistry, Wake Forest University, Salem Hall, Box 7486, Winston-Salem, NC, 27109, USA
| | - Daniel A Gonçalves
- Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, Rod. Dourados/Itahum, km 12, Dourados, MS, CEP: 79804-970, Brazil
| | - Logan M O'Brien
- Department of Chemistry, Wake Forest University, Salem Hall, Box 7486, Winston-Salem, NC, 27109, USA
| | - Jake A Carter
- Department of Chemistry, Wake Forest University, Salem Hall, Box 7486, Winston-Salem, NC, 27109, USA
| | - Bradley T Jones
- Department of Chemistry, Wake Forest University, Salem Hall, Box 7486, Winston-Salem, NC, 27109, USA
| | - George L Donati
- Department of Chemistry, Wake Forest University, Salem Hall, Box 7486, Winston-Salem, NC, 27109, USA.
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8
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Caires CSA, Farias LAS, Gomes LE, Pinto BP, Gonçalves DA, Zagonel LF, Nascimento VA, Alves DCB, Colbeck I, Whitby C, Caires ARL, Wender H. Effective killing of bacteria under blue-light irradiation promoted by green synthesized silver nanoparticles loaded on reduced graphene oxide sheets. Mater Sci Eng C Mater Biol Appl 2020; 113:110984. [PMID: 32487400 DOI: 10.1016/j.msec.2020.110984] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 04/03/2020] [Accepted: 04/17/2020] [Indexed: 12/15/2022]
Abstract
Graphene oxide (GO) materials loaded with silver nanoparticles (AgNPs) have drawn considerable attention due to their capacity to efficiently inactivate bacteria though a multifaceted mechanism of action, as well as for presenting a synergetic effect against bacteria when compared to the activity of AgNPs and GO alone. In this investigation, we present an inexpensive and environmentally-friendly method for synthesizing reduced GO sheets coated with silver nanoparticles (AgNPs/r-GO) using a coffee extract solution as a green reducing agent. The physical and chemical properties of the produced materials were extensively characterized by scanning electron microscopy (SEM), field-emission gun transmission electron microscopy (FEG-TEM), ultraviolet and visible absorption (UV-Vis), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), inductively coupled plasma-optical emission spectroscopy (ICP-OES) and ion release determination. The results demonstrated that AgNPs/r-GO composites were successfully produced, revealing the formation of micrometer-sized r-GO sheets decorated by AgNPs of approximately 70 nm diameter. Finally, bactericidal and photobactericidal effects of the AgNPs/r-GO composites were tested against Staphylococcus aureus, in which the results showed that the composites presented antimicrobial and photoantimicrobial activities. Moreover, our results demonstrated for the first time, to our knowledge, that an efficient process of bacterial inactivation can be achieved by using AgNPs/r-GO composites under blue light irradiation as a result of three different bacterial killing processes: (i) chemical effect promoted by Ag+ ion release from AgNPs; (ii) photocatalytic activity induced by AgNPs/r-GO composites, enhancing the bacterial photoinactivation due to the excited-Plasmons of the AgNPs when anchored on r-GO; and (iii) photodynamic effect produced by bacterial endogenous photosensitizers under blue-light irradiation. In summary, the present findings demonstrated that AgNPs/r-GO can be obtained by a non-toxic procedure with great potential for biomedical-related applications.
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Affiliation(s)
- Cynthia S A Caires
- Laboratory of Spectroscopy and Bioinformatics Applied to Biodiversity and Health, Faculty of Medicine, Federal University of Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul 79070-900, Brazil; School of Life Sciences, University of Essex, Colchester CO4 3SQ, UK
| | - Luiz A S Farias
- Laboratory of Nanomaterials and Applied Nanotechnology (LNNA), Institute of Physics, Federal University of Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul 79070-900, Brazil
| | - Luiz E Gomes
- Laboratory of Nanomaterials and Applied Nanotechnology (LNNA), Institute of Physics, Federal University of Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul 79070-900, Brazil
| | - Bruno P Pinto
- Laboratory of Nanomaterials and Applied Nanotechnology (LNNA), Institute of Physics, Federal University of Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul 79070-900, Brazil
| | - Daniel A Gonçalves
- Laboratory of Spectroscopy and Bioinformatics Applied to Biodiversity and Health, Faculty of Medicine, Federal University of Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul 79070-900, Brazil; Department of Chemistry, Minas Gerais State University - UEMG, Ituiutaba, MG 38302-192, Brazil
| | - Luiz F Zagonel
- "Gleb Wataghin" Institute of Physics, University of Campinas - UNICAMP, 13083-859 Campinas, São Paulo, Brazil
| | - Valter A Nascimento
- Laboratory of Spectroscopy and Bioinformatics Applied to Biodiversity and Health, Faculty of Medicine, Federal University of Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul 79070-900, Brazil
| | - Diego C B Alves
- Laboratory of Nanomaterials and Applied Nanotechnology (LNNA), Institute of Physics, Federal University of Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul 79070-900, Brazil
| | - Ian Colbeck
- School of Life Sciences, University of Essex, Colchester CO4 3SQ, UK
| | - Corinne Whitby
- School of Life Sciences, University of Essex, Colchester CO4 3SQ, UK
| | - Anderson R L Caires
- School of Life Sciences, University of Essex, Colchester CO4 3SQ, UK; Laboratory of Optics and Photonics, Institute of Physics, Federal University of Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul 79070-900, Brazil.
| | - Heberton Wender
- Laboratory of Nanomaterials and Applied Nanotechnology (LNNA), Institute of Physics, Federal University of Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul 79070-900, Brazil.
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Alencar MC, Gonçalves DA, Nicolodelli G, Oliveira SL, Donati GL, Caires ARL. Evaluating the applicability of multi-energy calibration as an alternative method for quantitative molecular spectroscopy analysis. Spectrochim Acta A Mol Biomol Spectrosc 2019; 221:117221. [PMID: 31170605 DOI: 10.1016/j.saa.2019.117221] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 05/25/2019] [Accepted: 05/27/2019] [Indexed: 06/09/2023]
Abstract
Multi-Energy Calibration (MEC) was recently proposed as an innovative analytical method to be used in efficient and accurate quantitative analysis based on atomic spectroscopy. Here, the applicability of the MEC method for quantifying molecular species using UV-Vis and fluorescence measurements was evaluated for the first time. UV-Vis and fluorescence spectra of the analytical solutions of methylene blue and eosin-methylene blue in two different solvents (distilled-deionized water and methanol) were collected. MEC showed high precision and sensitivity for determining the analyte concentration, providing similar limit of detection and quantification when compared with conventional analytical methods, such as external standard calibration and standard additions. Therefore, the present study has shown that MEC can be successfully applied for quantifying molecular species in a simple and efficient way accounting UV-Vis and fluorescence spectroscopy.
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Affiliation(s)
- Mizael C Alencar
- Institute of Physics, Federal University of Mato Grosso do Sul - UFMS, Campo Grande, MS 79070-900, Brazil
| | - Daniel A Gonçalves
- Department of Chemistry, Minas Gerais State University - UEMG, Ituiutaba, MG 38302-197, Brazil.
| | - Gustavo Nicolodelli
- Institute of Physics, Federal University of Mato Grosso do Sul - UFMS, Campo Grande, MS 79070-900, Brazil
| | - Samuel L Oliveira
- Institute of Physics, Federal University of Mato Grosso do Sul - UFMS, Campo Grande, MS 79070-900, Brazil
| | - George L Donati
- Department of Chemistry, Wake Forest University, Salem Hall, Box 7486, Winston-Salem, NC 21709, USA
| | - Anderson R L Caires
- Institute of Physics, Federal University of Mato Grosso do Sul - UFMS, Campo Grande, MS 79070-900, Brazil.
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Gonçalves DA, de Souza ID, Rosa ACG, Melo ESP, Goncalves AMB, de Oliveira LCS, do Nascimento VA. Multi-wavelength calibration: Determination of trace toxic elements in medicine plants by ICP OES. Microchem J 2019. [DOI: 10.1016/j.microc.2019.01.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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11
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Scherer MD, Sposito JCV, Falco WF, Grisolia AB, Andrade LHC, Lima SM, Machado G, Nascimento VA, Gonçalves DA, Wender H, Oliveira SL, Caires ARL. Cytotoxic and genotoxic effects of silver nanoparticles on meristematic cells of Allium cepa roots: A close analysis of particle size dependence. Sci Total Environ 2019; 660:459-467. [PMID: 30640113 DOI: 10.1016/j.scitotenv.2018.12.444] [Citation(s) in RCA: 71] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 12/14/2018] [Accepted: 12/28/2018] [Indexed: 05/25/2023]
Abstract
The use of silver nanoparticles (AgNPs) in commercial products has increased significantly in recent years. However, findings on the toxic effects of the AgNPs are still limited. This paper reports an investigation on the cytotoxic and genotoxic potential of the AgNPs on root cells of Allium cepa. Germination (GI), root elongation (REI), mitotic (MI), nuclear abnormality (NAI), and micronucleus index (MNI) were determined for seeds exposed to various AgNPs diameters (10, 20, 51, and 73 nm) as well as to the silver bulk (AgBulk) (micrometer-size particles) at the concentration of 100 mg·L-1. Transmission electron microscopy (TEM) provided the particle size distribution, while dynamic light scattering (DLS) was used to get the hydrodynamic size, polydispersity index, and zeta potential of the AgNPs. Laser-induced breakdown spectroscopy (LIBS) and inductively coupled plasma/optical emission spectrometry (ICP OES) were applied for quantifying the AgNPs content uptake by roots. Silver dissolution was determined by dialysis experiment. Results showed that the AgNPs penetrated the roots, affecting MI, GI, NAI, and MNI in meristematic cells. Changes in these indicators were AgNPs diameter-dependent so that cytotoxic and genotoxic effects in Allium cepa increased with the reduction of the particle diameter. The results also revealed that the AgNPs were the main responsible for the cytotoxicity and genotoxicity since negligible silver dissolution was observed.
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Affiliation(s)
- Marisa D Scherer
- Grupo de Óptica e Fotônica, Universidade Federal de Mato Grosso do Sul, CP 549, 790070-900 Campo Grande, MS, Brazil
| | - Juliana C V Sposito
- Grupo de Óptica Aplicada, Universidade Federal da Grande Dourados, CP 533, 79804-970 Dourados, MS, Brazil
| | - William F Falco
- Grupo de Óptica Aplicada, Universidade Federal da Grande Dourados, CP 533, 79804-970 Dourados, MS, Brazil
| | - Alexeia B Grisolia
- Grupo de Óptica Aplicada, Universidade Federal da Grande Dourados, CP 533, 79804-970 Dourados, MS, Brazil
| | - Luis H C Andrade
- Grupo de Espectroscopia Óptica e Fototérmica, Universidade Estadual do Mato Grosso do Sul, CP 523, 79804-970 Dourados, MS, Brazil
| | - Sandro M Lima
- Grupo de Espectroscopia Óptica e Fototérmica, Universidade Estadual do Mato Grosso do Sul, CP 523, 79804-970 Dourados, MS, Brazil.
| | - Giovanna Machado
- Centro de Tecnologias Estratégicas do Nordeste - CETENE, Recife, PE, Brazil..
| | - Valter A Nascimento
- Grupo de Espectroscopia e Bioinformática Aplicados a Biodiversidade e a Saúde, Universidade Federal de Mato Grosso do Sul, CP 549, 79070-900 Campo Grande, MS, Brazil
| | - Daniel A Gonçalves
- Grupo de Espectroscopia e Bioinformática Aplicados a Biodiversidade e a Saúde, Universidade Federal de Mato Grosso do Sul, CP 549, 79070-900 Campo Grande, MS, Brazil
| | - Heberton Wender
- Grupo de Óptica e Fotônica, Universidade Federal de Mato Grosso do Sul, CP 549, 790070-900 Campo Grande, MS, Brazil
| | - Samuel L Oliveira
- Grupo de Óptica e Fotônica, Universidade Federal de Mato Grosso do Sul, CP 549, 790070-900 Campo Grande, MS, Brazil.
| | - Anderson R L Caires
- Grupo de Óptica e Fotônica, Universidade Federal de Mato Grosso do Sul, CP 549, 790070-900 Campo Grande, MS, Brazil.
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Althoff AG, Williams CB, McSweeney T, Gonçalves DA, Donati GL. Microwave-Induced Plasma Optical Emission Spectrometry (MIP OES) and Standard Dilution Analysis to Determine Trace Elements in Pharmaceutical Samples. Appl Spectrosc 2017; 71:2692-2698. [PMID: 28675311 DOI: 10.1177/0003702817721750] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this work, we evaluate the application of microwave-induced plasma optical emission spectrometry (MIP OES) to determine of Al, Cr, Co, Cu, Fe, Mn, Ni and Zn in children's cough syrup, eye drops, and oral antiseptic using standard dilution analysis (SDA). The SDA method is simple, with only two calibration solutions prepared per sample. The first solution (S1), composed of 50% sample +50% of a standard solution, is introduced into the plasma and the analytical signals are monitored in a time-resolved fashion. Then, the second solution (S2), composed of 50% sample +50% blank, is poured into the vial containing S1. As the solutions mix, the analytical signals gradually drop to a stable baseline. The calibration curve is computed by plotting the ratio of the analyte signal (SA) over the internal standard signal (which is also part of S1) (SIS) on the y-axis, versus the inverse of the IS concentration on the x-axis (i.e., SA/SIS versus 1/CIS). In this study, SDA results were compared with values obtained with the traditional methods of external calibration (EC), internal standardization (IS), and standard additions (SA) in MIP OES determinations. The precision (represented as percent RSD) for SDA showed values in the range of 2.50-8.00% for all samples, while conventional calibration methods showed RSDs in the range of 6.40-32.50% for EC, 8.30-21.80% for IS, and 5.20-17.40% for SA. The LODs calculated for SDA are below the maximum limits allowed by the major pharmaceutical regulatory agencies, and presents superior precision and accuracy compared to the traditional calibration methods. Considering its simplicity and efficiency, SDA is an important new tool for accurate analyses of pharmaceuticals.
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Affiliation(s)
- Amanda G Althoff
- 1 Department of Chemistry, Wake Forest University, Salem Hall, Winston-Salem, NC, USA
| | - Charles B Williams
- 1 Department of Chemistry, Wake Forest University, Salem Hall, Winston-Salem, NC, USA
| | | | - Daniel A Gonçalves
- 3 Institute of Chemistry, Federal University of Mato Grosso do Sul, MS, Brazil
| | - George L Donati
- 1 Department of Chemistry, Wake Forest University, Salem Hall, Winston-Salem, NC, USA
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Gonçalves DA, Soncin AC, Donati GL, Dos Santos MC. Determination of Trace Elements in Cow Placenta by Tungsten Coil Atomic Emission Spectrometry. Biol Trace Elem Res 2017; 178:228-234. [PMID: 28092076 DOI: 10.1007/s12011-016-0926-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 12/26/2016] [Indexed: 11/30/2022]
Abstract
Tungsten coil atomic emission spectrometry (WCAES) is used to determine trace levels of Mn (403.1 nm) and Cr (425.5 nm) in cow placenta. All samples were collected in Ilha Solteira, SP, Brazil. The instrumental setup is based on a tungsten filament extracted from 150 W, 15 V microscope light bulbs, a solid state power supply, fused silica lens, crossed Czerny-Turner spectrograph, and a thermoelectrically cooled charge-coupled device detector. The limits of detection (LOD) and quantification (LOQ) for Cr are 2 and 8 μg L-1, and 20 and 60 μg L-1 for Mn, respectively. Recoveries for 0.30 mg L-1 spikes of each analyte were in the range 93.0-103.0%, and relative standard deviation (RSD) was between 6.50 and 7.20% for both elements. Placenta samples were microwave-assisted digested with diluted HNO3 and H2O2 and analyzed by WCAES. The results for Cr and Mn were compared with values obtained by tandem inductively coupled plasma mass spectrometry (ICP-MS/MS). No statistically significant difference was observed between the different methods by applying a paired t test at a 95% confidence level. The average concentrations of Cr and Mn in the placentas evaluated were 0.95 ± 0.22 and 2.64 ± 0.39 μg g-1, respectively. By using a short integration time, LODs for Cr and Mn were lower than values reported by recent works using a similar WCAES system.
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Affiliation(s)
- Daniel A Gonçalves
- Institute of Chemistry, Federal University of Mato Grosso do Sul, Av. Sen. Filinto Muller, 1555, Cidade Universitária, Campo Grande, MS, 79074-460, Brazil.
| | - Ana C Soncin
- Department of Physics and Chemistry, UNESP - Univ Estadual Paulista, Av Brasil, 56, Centro, Ilha Solteira, SP, 15385-000, Brazil
| | - George L Donati
- Department of Chemistry, Wake Forest University, Salem Hall, Box 7486, Winston-Salem, NC, 27109, USA
| | - Mirian C Dos Santos
- Department of Analytical Chemistry, UNESP - Univ Estadual Paulista, Rua Prof. Francisco Degni, 55, Quitandinha, Araraquara, SP, 14800-060, Brazil
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Virgilio A, Gonçalves DA, McSweeney T, Gomes Neto JA, Nóbrega JA, Donati GL. Multi-energy calibration applied to atomic spectrometry. Anal Chim Acta 2017; 982:31-36. [DOI: 10.1016/j.aca.2017.06.040] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 06/16/2017] [Accepted: 06/21/2017] [Indexed: 10/19/2022]
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15
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Silveira WA, Gonçalves DA, Graça FA, Andrade-Lopes AL, Bergantin LB, Zanon NM, Godinho RO, Kettelhut IC, Navegantes LCC. Activating cAMP/PKA signaling in skeletal muscle suppresses the ubiquitin-proteasome-dependent proteolysis: implications for sympathetic regulation. J Appl Physiol (1985) 2014; 117:11-9. [PMID: 24833777 DOI: 10.1152/japplphysiol.01055.2013] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Although we have recently demonstrated that plasma catecholamines induce antiproteolytic effects on skeletal muscle (Graça FA, Gonçalves DAP, Silveira WA, Lira EC, Chaves VE, Zanon NM, Garófalo MAR, Kettelhut IC, Navegantes LCC. Am J Physiol Endocrinol Metab. 305: E1483-E1494, 2013), the role of the muscle sympathetic innervation and, more specifically, norepinephrine (NE) in regulating the ubiquitin (Ub)-proteasome system (UPS) remains unknown. Based on previous findings that chemical sympathectomy acutely reduces UPS activity, we hypothesized that muscle NE depletion induces adrenergic supersensitivity in rat skeletal muscles. We report that surgical sympathetic denervation (SDEN), a condition in which only muscle NE from both hindlimbs is depleted, transiently reduced the overall proteolysis and the UPS activity (∼25%) in both soleus and extensor digitorum longus muscles. This antiproteolytic response was accompanied by increased activity of adenylyl cyclase (112%), levels of cyclic adenosine monophosphate (cAMP; 191%), and the serine phosphorylation of cAMP response element-binding protein (32%). In extensor digitorum longus from normal rats, NE (10(-4) M) in vitro increased the levels of cAMP (115%) and the serine phosphorylation of both cAMP response element-binding protein (2.7-fold) and forkhead box class O1 transcription factor. Similar effects were observed in C2C12 cells incubated with forskolin (10 μM). In parallel, NE significantly reduced the basal UPS (21%) activity and the mRNA levels of atrophy-related Ub-ligases. Similar responses were observed in isolated muscles exposed to 6-BNZ-cAMP (500 μM), a specific PKA activator. The phosphorylation levels of Akt were not altered by SDEN, NE, forskolin or 6-BNZ-cAMP. Our results demonstrate that SDEN induces muscle adrenergic supersensitivity for cAMP leading to the suppression of UPS, and that the suppressive effects of NE on UPS activity and expression of Ub-ligases can be mediated by the activation of cAMP/PKA signaling, with the inhibition of forkhead box class O1 transcription factor.
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Affiliation(s)
- W A Silveira
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - D A Gonçalves
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - F A Graça
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - A L Andrade-Lopes
- Division of Cellular Pharmacology, Department of Pharmacology, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - L B Bergantin
- Division of Cellular Pharmacology, Department of Pharmacology, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - N M Zanon
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - R O Godinho
- Division of Cellular Pharmacology, Department of Pharmacology, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - I C Kettelhut
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil; Department of Biochemistry/Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil; and
| | - L C C Navegantes
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil;
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Fortes S, Lopes CS, Villano LAB, Campos MR, Gonçalves DA, Mari JDJ. Common mental disorders in Petrópolis-RJ: a challenge to integrate mental health into primary care strategies. Rev Bras Psiquiatr 2011; 33:150-6. [DOI: 10.1590/s1516-44462011000200010] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2010] [Accepted: 08/16/2010] [Indexed: 11/22/2022]
Abstract
OBJECTIVE: Common mental disorders are present in more than 50% of patients attending primary care clinics. The main objectives of this study were to detect whether there is any special group of patients within the Family Health Strategy that should be considered to be in greater risk for common mental disorders and to recommend alternative interventions to aid these patients. METHOD: In 2002, a cross-sectional study on common mental disorders seen at Family Health Strategy centers was conducted in Petrópolis, State of Rio de Janeiro. RESULTS: Common mental disorders were associated with women (OR = 2.90; 95% CI 1.82-4.32), younger than 45 years of age (OR = 1.43; 95% CI 1.02-2.01), with a monthly per capita family income of less than US$40.00 (OR = 1.68; 95% CI 1.20-2.39), and without a partner (OR = 1.71; 95% CI 1.22-2.39). Illiteracy was associated with common mental disorders among patients who were not extremely poor. Social support networks such as going often to church (OR = 0.62; 95% CI 0.43-0.89); participating in artistic and sporting activities (OR = 0.42; 95% CI 0.26-0.70) and having at least four trusted relatives or friends (OR = 0.53; 95% CI 0.31-0.91) was inversely associated with common mental disorders. DISCUSSION: Poor women with little social support represent a special group at risk for common mental disorders in the primary care setting. Some countries have developed special interventions to treat patients with common mental disorders in primary care. CONCLUSION: Mental health care programs could include evidence-based psychosocial interventions to assist women in overcoming the vicious circle of poverty and dealing with their mental disorders.
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Gonçalves DA, Fortes S, Tófoli LF, Campos MR, Mari JDJ. Determinants of common mental disorders detection by general practitioners in primary health care in Brazil. Int J Psychiatry Med 2011; 41:3-13. [PMID: 21495518 DOI: 10.2190/pm.41.1.b] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Common mental disorders (CMD) are highly prevalent among patients attending primary care. Many of these disorders remain unrecognized by general practitioners (GPs), with the detection rates varying from 30 to 60%. This study aims to evaluate the CMD detection rates by Primary Heath Care (PHC) practitioners in Brazil-and factors that affect CMD detection. METHODS A cross sectional study was conducted with users of five PHC units in the city of Petrópolis. The CMD prevalence of psychiatric morbidity was estimated by the General Health Questionnaire-12, and the physician's CMD detection was evaluated by a questionnaire completed by GPs after each consultation. RESULTS Seven hundred and fourteen subjects participated of the study, and 400 (56%) were screened positive using GHQ-12 cut-off point of 2/3. GPs diagnosed 379 people with CMD (53.1%), and 256(36%) subjects were detected by both GHQ and the GPs with an OR of 3.04 (95% CI 2.23-4.13). CMD detection accuracy by GPs was 65%. There was a strong association between the detection of CMD and the report of medically unexplained physical symptoms by GPs. Being female, married, and a frequent service user was also related to higher detection rates. CONCLUSION CMD detection rate was similar to those reported worldwide, but contrary to other studies, the presence of MUS increased detection rates. The high frequency of CMD in Primary Health Care highlights the need for improving GP and health worker's training in order to enable them to accurately recognize and treat psychological distress with evidence-based interventions.
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