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Ligiero CBP, Fernandes TS, D'Amato DL, Gaspar FV, Duarte PS, Strauch MA, Fonseca JG, Meirelles LGR, Bento da Silva P, Azevedo RB, Aparecida de Souza Martins G, Archanjo BS, Buarque CD, Machado G, Percebom AM, Ronconi CM. Influence of particle size on the SARS-CoV-2 spike protein detection using IgG-capped gold nanoparticles and dynamic light scattering. Mater Today Chem 2022; 25:100924. [PMID: 35475288 PMCID: PMC9023328 DOI: 10.1016/j.mtchem.2022.100924] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 03/27/2022] [Accepted: 03/29/2022] [Indexed: 05/03/2023]
Abstract
Due to the unprecedented and ongoing nature of the coronavirus outbreak, the development of rapid immunoassays to detect severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and its highly contagious variants is an important and challenging task. Here, we report the development of polyclonal antibody-functionalized spherical gold nanoparticle biosensors as well as the influence of the nanoparticle sizes on the immunoassay response to detect the SARS-CoV-2 spike protein by dynamic light scattering. By monitoring the increment in the hydrodynamic diameter (ΔDH) by dynamic light scattering measurements in the antigen-antibody interaction, SARS-CoV-2 S-protein can be detected in only 5 min. The larger the nanoparticles, the larger ΔDH in the presence of spike protein. From adsorption isotherm, the calculated binding constant (K D ) was 83 nM and the estimated limit of detection was 13 ng/mL (30 pM). The biosensor was stable up to 90 days at 4 °C. Therefore, the biosensor developed in this work could be potentially applied as a fast and sensible immunoassay to detect SARS-CoV-2 infection in patient samples.
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Affiliation(s)
- C B P Ligiero
- Departamento de Química Inorgânica, Universidade Federal Fluminense (UFF), Campus Do Valonguinho, Outeiro de São João Batista, S/n, 24020-141, Niterói, RJ, Brazil
| | - T S Fernandes
- Departamento de Química Inorgânica, Universidade Federal Fluminense (UFF), Campus Do Valonguinho, Outeiro de São João Batista, S/n, 24020-141, Niterói, RJ, Brazil
| | - D L D'Amato
- Departamento de Química Inorgânica, Universidade Federal Fluminense (UFF), Campus Do Valonguinho, Outeiro de São João Batista, S/n, 24020-141, Niterói, RJ, Brazil
| | - F V Gaspar
- Departamento de Química Inorgânica, Universidade Federal Fluminense (UFF), Campus Do Valonguinho, Outeiro de São João Batista, S/n, 24020-141, Niterói, RJ, Brazil
- Departamento de Química, Pontifícia Universidade Católica Do Rio de Janeiro (PUC-Rio), Rio de Janeiro, RJ, 22451-900, Brazil
| | - P S Duarte
- Departamento de Química, Pontifícia Universidade Católica Do Rio de Janeiro (PUC-Rio), Rio de Janeiro, RJ, 22451-900, Brazil
| | - M A Strauch
- Gerência de Desenvolvimento Tecnológico, Instituto Vital Brazil, Niterói, RJ, 24230-410, Brazil
| | - J G Fonseca
- Gerência de Desenvolvimento Tecnológico, Instituto Vital Brazil, Niterói, RJ, 24230-410, Brazil
| | - L G R Meirelles
- Fazenda Instituto Vital Brazil, Niterói, RJ, 24230-410, Brazil
| | - P Bento da Silva
- Departamento de Genética e Morfologia, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, 70910-900, Brazil
| | - R B Azevedo
- Departamento de Genética e Morfologia, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, 70910-900, Brazil
| | - G Aparecida de Souza Martins
- Programa de Pós-graduação Em Ciência e Tecnologia de Alimentos, Universidade Federal Do Tocantins, 77001-090, Brazil
| | - B S Archanjo
- Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Qualidade e Tecnologia (Inmetro), Duque de Caxias, RJ, 25250-020, Brazil
| | - C D Buarque
- Departamento de Química, Pontifícia Universidade Católica Do Rio de Janeiro (PUC-Rio), Rio de Janeiro, RJ, 22451-900, Brazil
| | - G Machado
- Centro de Tecnologias Estratégicas Do Nordeste, Av. Prof. Luiz Freire 01, Recife, Pernambuco, 50740-540, Brazil
| | - A M Percebom
- Departamento de Química, Pontifícia Universidade Católica Do Rio de Janeiro (PUC-Rio), Rio de Janeiro, RJ, 22451-900, Brazil
| | - C M Ronconi
- Departamento de Química Inorgânica, Universidade Federal Fluminense (UFF), Campus Do Valonguinho, Outeiro de São João Batista, S/n, 24020-141, Niterói, RJ, Brazil
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Santos FTJ, Siqueira WN, Santos MLO, Silva HAMF, Sá JLF, Fernandes TS, Silva NH, França EJ, Silva EB, Melo AMMA. Radiosensitizer effect of usnic acid on Biomphalaria glabrata embryos. Int J Radiat Biol 2018; 94:838-843. [DOI: 10.1080/09553002.2018.1492757] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- F. T. J. Santos
- Departamento de Biofísica e Radiobiologia, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
- Departamento de Energia Nuclear, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - W. N. Siqueira
- Departamento de Biofísica e Radiobiologia, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
- Departamento de Energia Nuclear, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
- Serviço de Monitoração Ambiental, Centro Regional de Ciências Nucleares do Nordeste, Recife, Pernambuco, Brazil
| | - M. L. O. Santos
- Departamento de Biofísica e Radiobiologia, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
- Serviço de Monitoração Ambiental, Centro Regional de Ciências Nucleares do Nordeste, Recife, Pernambuco, Brazil
| | - H. A. M. F. Silva
- Departamento de Biofísica e Radiobiologia, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - J. L. F. Sá
- Departamento de Biofísica e Radiobiologia, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - T. S. Fernandes
- Departamento de Biofísica e Radiobiologia, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
- Departamento de Energia Nuclear, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - N. H. Silva
- Departamento de Bioquímica, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - E. J. França
- Serviço de Monitoração Ambiental, Centro Regional de Ciências Nucleares do Nordeste, Recife, Pernambuco, Brazil
| | - E. B. Silva
- Departamento de Energia Nuclear, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - A. M. M. A. Melo
- Departamento de Biofísica e Radiobiologia, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
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Lemos-Pinto MMP, Cadena M, Santos N, Fernandes TS, Borges E, Amaral A. A dose-response curve for biodosimetry from a 6 MV electron linear accelerator. ACTA ACUST UNITED AC 2015; 48:908-14. [PMID: 26445334 PMCID: PMC4617117 DOI: 10.1590/1414-431x20154470] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [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: 10/22/2014] [Accepted: 02/03/2015] [Indexed: 11/22/2022]
Abstract
Biological dosimetry (biodosimetry) is based on the investigation of radiation-induced biological effects (biomarkers), mainly dicentric chromosomes, in order to correlate them with radiation dose. To interpret the dicentric score in terms of absorbed dose, a calibration curve is needed. Each curve should be constructed with respect to basic physical parameters, such as the type of ionizing radiation characterized by low or high linear energy transfer (LET) and dose rate. This study was designed to obtain dose calibration curves by scoring of dicentric chromosomes in peripheral blood lymphocytes irradiated in vitro with a 6 MV electron linear accelerator (Mevatron M, Siemens, USA). Two software programs, CABAS (Chromosomal Aberration Calculation Software) and Dose Estimate, were used to generate the curve. The two software programs are discussed; the results obtained were compared with each other and with other published low LET radiation curves. Both software programs resulted in identical linear and quadratic terms for the curve presented here, which was in good agreement with published curves for similar radiation quality and dose rates.
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Affiliation(s)
- M M P Lemos-Pinto
- Departamento de Energia Nuclear, Universidade Federal de Pernambuco, Recife, PE, BR
| | - M Cadena
- Departamento de Energia Nuclear, Universidade Federal de Pernambuco, Recife, PE, BR
| | - N Santos
- Departamento de Energia Nuclear, Universidade Federal de Pernambuco, Recife, PE, BR
| | - T S Fernandes
- Departamento de Energia Nuclear, Universidade Federal de Pernambuco, Recife, PE, BR
| | - E Borges
- Departamento de Energia Nuclear, Universidade Federal de Pernambuco, Recife, PE, BR
| | - A Amaral
- Departamento de Energia Nuclear, Universidade Federal de Pernambuco, Recife, PE, BR
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Aguiar LAA, Silva IMS, Fernandes TS, Nogueira RA. Long-term correlation of the electrocorticogram as a bioindicator of brain exposure to ionizing radiation. ACTA ACUST UNITED AC 2015; 48:915-22. [PMID: 26445335 PMCID: PMC4617118 DOI: 10.1590/1414-431x20154473] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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: 11/19/2014] [Accepted: 02/06/2015] [Indexed: 11/25/2022]
Abstract
Understanding the effects of radiation and its possible influence on the nervous
system are of great clinical interest. However, there have been few
electrophysiological studies on brain activity after exposure to ionizing radiation
(IR). A new methodological approach regarding the assessment of the possible effects
of IR on brain activity is the use of linear and nonlinear mathematical methods in
the analysis of complex time series, such as brain oscillations measured using the
electrocorticogram (ECoG). The objective of this study was to use linear and
nonlinear mathematical methods as biomarkers of gamma radiation regarding cortical
electrical activity. Adult Wistar rats were divided into 3 groups: 1 control and 2
irradiated groups, evaluated at 24 h (IR24) and 90 days (IR90) after exposure to 18
Gy of gamma radiation from a cobalt-60 radiotherapy source. The ECoG was analyzed
using power spectrum methods for the calculation of the power of delta, theta, alpha
and beta rhythms and by means of the α-exponent of the detrended fluctuation analysis
(DFA). Using both mathematical methods it was possible to identify changes in the
ECoG, and to identify significant changes in the pattern of the recording at 24 h
after irradiation. Some of these changes were persistent at 90 days after exposure to
IR. In particular, the theta wave using the two methods showed higher sensitivity
than other waves, suggesting that it is a possible biomarker of exposure to IR.
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Affiliation(s)
- L A A Aguiar
- Departamento de Morfologia e Fisiologia Animal, Laboratório de Biofísica Teórico-Experimental e Computacional, Universidade Federal Rural de Pernambuco, PE, Recife, BR
| | - I M S Silva
- Departamento de Biofísica e Radiobiologia, Universidade Federal de Pernambuco, PE, Recife, BR
| | - T S Fernandes
- Departamento de Biofísica e Radiobiologia, Universidade Federal de Pernambuco, PE, Recife, BR
| | - R A Nogueira
- Departamento de Morfologia e Fisiologia Animal, Laboratório de Biofísica Teórico-Experimental e Computacional, Universidade Federal Rural de Pernambuco, PE, Recife, BR
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Echer IC, Onzi MR, da Cruz ADM, Ben GM, Fernandes TS, Bruxel VM. [Visitors' opinion on the system of patient visits in an intensive care unit]. Rev Gaucha Enferm 1999; 20:57-67; quiz 68. [PMID: 10948936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
Abstract
The objective of this study is to identify whether the current system of visits schedule and patient's information at a Clinical and Surgical Intensive Care Unit (ICU) satisfy the patient's visitors. To do it, two hundred questionnaires were distributed, during a month, and one hundred and sixty returned. The results showed that 70% of the visitors are satisfied with the current schedule; 67% come in daily; 66% are satisfied with the time they have for visiting, 54% asked for access in out of the current schedule, 69% are satisfied with staff information about patients; 88% of the visitors are patient's relatives. The most frequent suggestion was to increase the visit time at this ICU.
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Affiliation(s)
- I C Echer
- Departamento de Assistência e Orientação Profissional, Escola de Enfermagem, da Universidade Federal do Rio Grande do Sul
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