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302 results on '"Santelli, Ricardo Erthal"'

7. Direct Electrochemical Determination of Glyphosate Herbicide Using a Screen-Printed Carbon Electrode Modified with Carbon Black and Niobium Nanoparticles

Author

Fernandes, Julia Oliveira, Bernardino, Cassiano Augusto Rolim, dos Santos Fernandes, Juliana, Mahler, Claudio Fernando, Braz, Bernardo Ferreira, dos Santos, Luiz Henrique Carpenter, Corrêa, Rodrigo José, Santelli, Ricardo Erthal, Archanjo, Braulio Soares, Ribeiro, Emerson Schwingel, and Cincotto, Fernando Henrique

Published
2023
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11. (Bio)Sensing Materials: Quantum Dots

Author

Fernandes, Julia Oliveira, primary, Bernardino, Cassiano Augusto Rolim, additional, Braz, Bernardo Ferreira, additional, Mahler, Claudio Fernando, additional, Santelli, Ricardo Erthal, additional, and Cincotto, Fernando Henrique, additional

Published
2023
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14. Synthetic Naphthoquinone Inhibits Herpes Simplex Virus Type‑1 Replication Targeting Na+, K+ ATPase.

Author

Souza, Kauê Francisco Corrêa de Souza e, Rabelo, Vitor Won-Held, Abreu, Paula Alvarez, Santos, Cláudio César Cirne, Amaral e Silva, Nayane Abreu do, Luna, Daniela de, Ferreira, Vitor Francisco, Braz, Bernardo Ferreira, Santelli, Ricardo Erthal, Gonçalves-de-Albuquerque, Cassiano Felippe, Paixão, Izabel Christina Nunes de Palmer, and Burth, Patricia

Published
2024
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15. A Comparative Study of Dairy and Non-Dairy Milk Types: Development and Characterization of Customized Plant-Based Milk Options.

Author

Silva, Aline Rolim Alves da, Santelli, Ricardo Erthal, Braz, Bernardo Ferreira, Silva, Marselle Marmo Nascimento, Melo, Lauro, Lemes, Ailton Cesar, and Ribeiro, Bernardo Dias

Subjects
MILK substitutes, CASHEW nuts, NUTRITIONAL requirements, COWS, HAZELNUTS, SUNFLOWER seeds
Abstract

Plant-based milk has gained considerable attention; however, its high nutritional variation highlights the need for improved formulation designs to enhance its quality. This study aimed to nutritionally compare cow milk with plant-based milk produced from hazelnuts (H), Brazil nuts (BN), cashew nuts (CN), soybeans (S), and sunflower seeds (SS), and to perform physicochemical and technological characterization. The plant-based milk produced with isolated grains showed a nutritional composition inferior to that of cow milk in almost all evaluated parameters, protein content (up to 1.1 g 100 g−1), lipids (up to 2.7 g 100 g−1), color parameters, minerals, and especially calcium (up to 62.4 mg L−1), which were originally high in cow milk (up to 1030 mg L−1). However, the plant-based milk designed using a blend composition was able to promote nutritional enhancement in terms of minerals, especially iron (Fe) and magnesium (Mg), high-quality lipids (up to 3.6 g 100 g−1), and carbohydrates (3.4 g 100 g−1 using CN, BN, and S). The protein content was 1.3% compared to 5.7 in cow milk, and the caloric value of plant-based milk remained 32.8 at 52.1 kcal, similar to cow milk. Satisfactory aspects were observed regarding the shelf life, especially related to microbiological stability during the 11 d of storage at 4 °C. For the designed plant-based milk to be equivalent to cow milk, further exploration for optimizing the blends used to achieve better combinations is required. Furthermore, analyzing possible fortification and preservation methods to increase shelf life and meet the nutritional and sensory needs of the public would be interesting. [ABSTRACT FROM AUTHOR]

Published
2024
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16. Disposable electrochemical sensor based on carbon black and ternary oxide (SiO2/TiO2/Nb2O5) for determination of triclosan in mouthwash and water samples.

Author

de Oliveira, Guilherme Barros, Silva, Francisco Walison Lima, Fernandes, Julia Oliveira, Bernardino, Cassiano Augusto Rolim, Mahler, Claudio Fernando, Braz, Bernardo Ferreira, Archanjo, Braulio Soares, Ribeiro, Emerson Schwingel, Santelli, Ricardo Erthal, and Cincotto, Fernando Henrique

Subjects
ELECTROCHEMICAL sensors, TRICLOSAN, CARBON-black, WATER sampling, MOUTHWASHES
Abstract

A new screen-printed electrode (SPE) modified with carbon black and ternary oxide (SiO2/TiO2/Nb2O5), denominated SPE/CB/SiTiNb and was developed for the direct detection of triclosan in tap water and mouthwash samples. The morphological characterization and electrochemical behavior of the sensors were performed by scanning electron microscopy, energy dispersive spectroscopy, and cyclic voltammetry. Differential pulse voltammetry was used to evaluate the proposed sensor in Britton–Robinson buffer 0.1 mol L−1 and showed a limit detection of 1.23 nmol L−1 in a linear range from 0.025 to 57.01 µmol L−1. Studies with possible interferents were performed demonstrating a significant selectivity of the sensor to the triclosan oxidation reaction. The sensor was applied in tap water and mouthwash real sample analyses, whose recoveries ranged from 93.4 to 98.8%, demonstrating that the sensor shows promise in the detection of triclosan in different matrices allied to high sensitivity, selectivity, low-cost, portability, disposability, and low sample volume, without pre-treatment, per analysis. [ABSTRACT FROM AUTHOR]

Published
2024
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17. An electrochemical sensor-based carbon black associated with a modified mixed oxide (SiO2/TiO2/Sb2O5) for direct determination of thiamethoxam in raw honey and water samples

Author

Gioia, Raísa Rodrigues, Fernandes, Julia Oliveira, Bernardino, Cassiano Augusto Rolim, Mahler, Claudio Fernando, Braz, Bernardo Ferreira, Lopes, Claudio Sabbatini Capella, Archanjo, Braulio Soares, Ribeiro, Emerson Schwingel, D’Elia, Eliane, Santelli, Ricardo Erthal, and Cincotto, Fernando Henrique

Published
2022
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23. Disposable electrochemical sensor based on carbon black and ternary oxide (SiO2/TiO2/Nb2O5) for determination of triclosan in mouthwash and water samples

Author

de Oliveira, Guilherme Barros, primary, Silva, Francisco Walison Lima, additional, Fernandes, Julia Oliveira, additional, Bernardino, Cassiano Augusto Rolim, additional, Mahler, Claudio Fernando, additional, Braz, Bernardo Ferreira, additional, Archanjo, Braulio Soares, additional, Ribeiro, Emerson Schwingel, additional, Santelli, Ricardo Erthal, additional, and Cincotto, Fernando Henrique, additional

Published
2023
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26. Distribution of Acid-Volatile Sulfides and Simultaneously Extracted Metals in Guanabara Bay: Combination of Anthropogenic, Sedimentological, and Geochemical Processes

Author

Cordeiro, Renato Campello, primary, Santelli, Ricardo Erthal, additional, Machado, Wilson Thadeu do Vale, additional, Gomes, Abilio Soares, additional, Moreira, Luciane Silva, additional, de Oliveira, Rafael Lopes, additional, Abreu, Ilene Matano, additional, and Meniconi, Maria de Fatima Guadalupe, additional

Published
2023
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33. Total zinc quantification by inductively coupled plasma-mass spectrometry and its speciation by size exclusion chromatography–inductively coupled plasma-mass spectrometry in human milk and commercial formulas: Importance in infant nutrition

Author

Fernández-Menéndez, Sonia, Fernández-Sánchez, María L., Fernández-Colomer, Belén, de la Flor St. Remy, Rafael R., Cotallo, Gil Daniel Coto, Freire, Aline Soares, Braz, Bernardo Ferreira, Santelli, Ricardo Erthal, and Sanz-Medel, Alfredo

Published
2016
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43. Development of an electrochemical sensor based on ternary oxide SiO2/Al2O3/SnO2modified with carbon black for direct determination of clothianidin in environmental and food samplesElectronic supplementary information (ESI) available. See DOI: https://doi.org/10.1039/d3ay00732d

Author

Silva, Francisco Walison Lima, de Oliveira, Guilherme Barros, Archanjo, Braulio Soares, Braz, Bernardo Ferreira, Santelli, Ricardo Erthal, Ribeiro, Emerson Schwingel, and Cincotto, Fernando Henrique

Abstract

This study presents the development of an electrochemical sensor, denoted as GCE/CB/SiAlSn, based on the modification of a glassy carbon electrode surface with the ternary oxide SiO2/Al2O3/SnO2associated with carbon black, for direct determination of the neonicotinoid pesticide clothianidin in different matrices, such as environmental and food samples. Morphological characterization by the scanning electron microscopy technique, electroanalytical analyses using the cyclic voltammetry technique and differential pulse voltammetry are presented which demonstrated that the developed electrochemical platform presents high sensitivity in the electroanalytical clothianidin determination. The linear range studied was from 2.99 × 10−7to 6.04 × 10−5mol L−1, with an LOD of 2.47 nmol L−1. This high sensitivity was explained using the synergistic relationship between carbon black and ternary oxide that maximized the electroactive surface area of the GCE/CB/SiAlSn sensor. Interferent studies were performed that showed high selectivity of the sensor to the pesticide in the presence of Ca2+, K+, Na+, and Mg2+and carbendazim, glyphosate, imidacloprid and thiamethoxam pesticides. The sensor was applied to real samples of tap water and apple juice obtaining recoveries from 91.0% to 103.0%.

Published
2023
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46. An electrochemical sensor-based carbon black associated with a modified mixed oxide (SiO2/TiO2/Sb2O5) for direct determination of thiamethoxam in raw honey and water samples.

Author

Gioia, Raísa Rodrigues, Fernandes, Julia Oliveira, Bernardino, Cassiano Augusto Rolim, Mahler, Claudio Fernando, Braz, Bernardo Ferreira, Lopes, Claudio Sabbatini Capella, Archanjo, Braulio Soares, Ribeiro, Emerson Schwingel, D'Elia, Eliane, Santelli, Ricardo Erthal, and Cincotto, Fernando Henrique

Subjects
HONEY, THIAMETHOXAM, CARBON-black, WATER sampling, HAZARDOUS substances, ELECTROCHEMICAL sensors, SCANNING electron microscopy
Abstract

The study aimed to develop an electrochemical sensor based on glassy carbon, mixed oxide (SiO2/TiO2/Sb2O5), and carbon black. The material was synthesized, characterized, and used to determine thiamethoxam in raw honey and water. The morphologic structure and electrochemical performance of the sensor was characterized by scanning electron microscopy and cyclic voltammetry. Differential pulse voltammetry with a concentration of 0.1 mol L−1 of Britton-Robinson buffer at pH 7.0 allowed the generation of a method to determine thiamethoxam in a linear range of 0.25 to 100.5 μmol L−1 and with a limit of detection of 0.012 μmol L−1. The system efficiently quantified traces of thiamethoxam in raw honey and tap water samples. The modified sensor did not present interferences of K+, Na+, Ca2+, Mg2+, glyphosate, imidacloprid, and carbendazim. In addition, the device showed good recovery values for thiamethoxam when applied directly to honey and water samples without any treatment, presenting an electrochemical sensor to monitor real-time hazardous substances in environmental and food matrices. [ABSTRACT FROM AUTHOR]

Published
2022
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48. Especiação de Arsênio - uma revisão

Author

Barra Cristina Maria, Santelli Ricardo Erthal, Abrão Jorge João, and Guardia Miguel de la

Subjects
arsenic compounds, speciation, toxicity, Chemistry, QD1-999
Abstract

This paper provides a review on separation methods and analytical techniques for the determination of several species of organic and inorganic arsenic in different matrices. Arsenic is an element whose speciation is of particular interest due to the great variation of toxicity levels exhibited for its different chemical forms. Arsenic (III) and As (V) are the most toxic species while organic compounds such as arsenobetaine (AsB), produced by methylation of inorganics species (carcinogenics) are relatively less toxic, hence the great importance of arsenic speciation in the determination of the degree of contamination of an environmental or biological system.

Published
2000

49. Subacute exposure to lead promotes disruption in the thyroid gland function in male and female rats

Author

de Lima Junior, Niedson Correia, primary, Camilo, Juliana Franco, additional, do Carmo, Pâmella Rodrigues, additional, de Andrade, Marcelle Novaes, additional, Braz, Bernardo Ferreira, additional, Santelli, Ricardo Erthal, additional, de Brito Gitirana, Lycia, additional, Ferreira, Andrea Claudia Freitas, additional, de Carvalho, Denise Pires, additional, Miranda-Alves, Leandro, additional, and Dias, Glaecir Roseni Mundstock, additional

Published
2021
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