Oldair Donizeti Leite
@portal.utfpr.edu.br
Professor Departamento Química
UTFPR - Universidade Tecnologica Federal do Paraná
RESEARCH, TEACHING, or OTHER INTERESTS
Analytical Chemistry, Environmental Chemistry, Biochemistry, Genetics and Molecular Biology, Electrochemistry
Scopus Publications
Scopus Publications
Renata Dias, Fernando Scremin, Paulo Bittencourt, Douglas Dragunski, Alex Torquato, and Oldair Leite
Sociedade Brasileira de Quimica (SBQ)
The composites of poly (butylene adipate co-terephthalate) / poly (lactic acid) (PBAT/PLA) blend and montmorillonites functionalized using imidazole-derived ionic liquids with different carbon chain sizes (butyl, octyl, and dodecyl) proved to be a promising alternative for improving the thermal and mechanical properties of the polymer blend. Functionalization of montmorillonites by ionic liquids was confirmed by increasing the basal spacing, and spectroscopical and thermal analysis evidence. The composite synthesis was carried out by casting technique generating homogeneous polymeric films. X-ray diffraction analyses suggested that montmorillonite functionalization with the ionic liquid of the butyl carbon chain fostered exfoliation and incorporation of the clay into the polymer. Furthermore, an increase in the thermal stability and mechanical properties of the material was observed. The other composites formed between the PBAT/PLA blend and the montmorillonite functionalized by ionic liquids of higher carbonic chain showed micro composites formation. Thus, their thermal and mechanical properties had no significant improvements.
Mayara Patricia de Oliveira Santos, Nicoli Andressa Carboni, Eder Lisandro de Moraes Flores, Cristiane Canan, Oldair Donizeti Leite, and Deisy Alessandra Drunkler
Elsevier BV
Jorge Luís Oliveira Santos, Giuliana Maria Gabancho Barrenechea Bueno, Éder Lisandro de Moraes Flores, Luci Emi Ogava, Fábio de Souza Dias, and Oldair Donizeti Leite
Elsevier BV
Flavia Manente da Silva, Fábio Orssatto, Oldair Donizeti Leite, Mariana Lupo Falchi, and Benedito Martins Gomes
Elsevier BV
Daniel Júnior Almeida dos Santos, Tássia Regina de Oliveira, Gabriela Martins de Araújo, Henrique Pott-Junior, Matias Eliseo Melendez, Ester Cerdeira Sabino, Oldair Donizeti Leite, and Ronaldo Censi Faria
Elsevier BV
Luci Emi Ogava, Antonio Cesar Godoy, Leticia Fantini-Hoag, Vanessa Lopes Fernandes, Celma Negrini, Camila Dal Pisol, Oldair Donizete Leite, Cristiane Canan, Monica Lady Fiorese, and Wilson Rogério Boscolo
Springer Science and Business Media LLC
Tássia R. de Oliveira, Patricia R. Manzine, Márcia R. Cominetti, Oldair D. Leite, and Ronaldo C. Faria
Elsevier BV
Raquel Roman Ros Doneda, Cristian Rafael Andriolli, Oldair Donizeti Leite, and Deisy Alessandra Drunkler
Universidade Estadual de Londrina
O açúcar mascavo é obtido a partir do caldo de cana-de-açúcar conservando suas propriedades quase inalteradas quando comparado à matéria-prima. O cultivo da cana-de-açúcar pode ser realizado por sistema de agricultura convencional ou por sistema de produção orgânica, o qual se destaca por sua crescente demanda ligada ao apelo à qualidade nutricional, segurança dos alimentos e questões ambientais. Este trabalho teve por objetivo analisar as influências dos sistemas de produção orgânico e convencional nas propriedades físico-químicas, sensoriais e na qualidade higiênico sanitária de açúcares mascavo comerciais. Para tal, onze amostras (05 convencionais e 06 orgânicas) foram analisadas. Os resultados foram tratados estatisticamente empregando análise de variância e, quando detectado diferença significativa ao nível de 5%, foram submetidos ao Teste de Tukey. As amostras, independente do tipo de cultivo, apresentaram resultados variáveis para os atributos umidade (0,80 a 3,24%), pH (6,03 a 8,71), cinzas (0,35 a 2,36%), cinzas condutimétricas (0,88 a 6,35%), glicídios redutores em glicose (3,09 a 7,91%), polaridade (80,19 a 92,95 °Z), sendo que para este atributo apenas cinco amostras encontraram-se de acordo com o único parâmetro exigido pela legislação (acima de 90,0 °Z); a cor apresentou luminosidade entre 44,05 a 61,72. Quanto aos minerais e metais, a amostra MO3 foi responsável pelas maiores concentrações de Ca (1.829,27 mg kg-1) e Mg (885,31 mg kg-1); na amostra MO1 o Mn esteve presente em maior quantidade (18,26 mg kg-1) e apresentou a menor concentração do elemento Al (1,02 mg kg-1); a MO4 obteve menor teor para o mineral Na (7,27 mg kg-1); a MO6 apresentou o teor mais baixo para o metal pesado Cu (3,06 mg kg-1) e mais elevado para o Zn com 6,43 mg kg-1; a concentração mais elevada de Fe esteve presente na amostra MC4, com 137,47 mg kg-1; o metal pesado Pb apenas não foi detectado nas amostras MC2, MC3 e MO3. As amostras apresentaram resultados satisfatórios e indicativos de práticas higiênico-sanitárias pela análise microscópica e microbiológica, com ausência de Coliformes a 45 ºC e Salmonella sp. e valores aceitáveis de mesófilos, bolores e leveduras. A análise sensorial não apresentou diferença estatística significativa (p > 0,05) entre os atributos avaliados: cor, granulosidade visual, sabor doce, aroma característico, solubilidade na boca e aceitação global. Em relação ao tipo de cultivo da cana-de-açúcar, os resultados em geral não permitiram afirmar a existência de vantagem na qualidade nutricional e higiênico sanitária do açúcar mascavo convencional ou orgânico.
Ana Paula Rossi, Daneysa Lahis Kalschne, Ana Paula Iglikowski Byler, Eder Lisandro de Moraes Flores, Oldair Donizeti Leite, Daniel dos Santos, Juliano Smanioto Barin, and Cristiane Canan
Elsevier BV
Cristiane Canan, Daneysa Lahis Kalschne, Gabriela Cavalca Ongaratto, Oldair Donizeti Leite, Ana Cristina Trindade Cursino, Eder Lisandro de Moraes Flores, and Elza Iouko Ida
Hindawi Limited
J. Hoppe Filho, C.A.O. Pires, O.D. Leite, M.R. Garcez, and M.H.F. Medeiros
Elsevier BV
J. Hoppe Filho, C. A. O. Pires, O. D. Leite, M. R. Garcez, and M. H. F. Medeiros
American Society of Civil Engineers (ASCE)
AbstractThis paper investigated the red ceramic waste originated from damaged sintered bricks as a potential source of pozzolanic mineral addition for portland cement. Physical, chemical, and miner...
Enoc Lima do Rego, Geraldo Resende Boaventura, Oldair Donizeti Leite, Daniel Ferreira Araújo, Anderson Santos Souza, Lucas Garcia Magalhães Peres, Aline Suares Coutinho Lima, José Domingos Santos da Silva, and Jurandir Rodrigues de Souza
Springer Science and Business Media LLC
Alex Sanches Torquato, Rosana Aparecida Silva‐Buzanello, Paulo Rodrigo Stival Bittencourt, Daneysa Lahis Kalschne, Francieli Graeff, Oldair Donizete Leite, Cristiane Canan, and Makoto Matsushita
Hindawi Limited
Daneysa Kalschne, Nathalia Silva, Cristiane Canan, Marta Benassi, Eder Flores, and Oldair Leite
Sociedade Brasileira de Quimica (SBQ)
Coffee is one of the most popular beverages in the world, however, little information is found regarding the mineral composition of commercial roasted and ground coffees (RG) and its correlation with organic bioactive compounds. 21 commercial Brazilian RG coffee brands - 9 traditional (T) and 12 extra strong (ES) roasted ones - were analyzed for the Cu, Ca, Mn, Mg, K, Zn, and Fe minerals, caffeine, 5-caffeoylquinic acid (5-CQA) and melanoidins contents. For minerals determination by flame atomic absorption spectrometry (FAAS), the samples were decomposed by microwave-assisted wet digestion. Caffeine and 5-CQA were determined by liquid chromatography and melanoidins by molecular absorption spectrometry. The minerals and organic compounds contents association in RG coffee was observed by a principal component analysis. The thermostable compounds (minerals and caffeine) were related to dimension 1 and 2, while 5-CQA and melanoidins were related to dimension 3, allowing for the T coffees segmentation from ES ones.
Jorge Luís Santos, Giuliana Bueno, Eder Flores, Oldair Leite, Clayton Janoni, Luis Carvalho, and Ana Maria dos Santos
Sociedade Brasileira de Quimica (SBQ)
Thallium (Tl) is a rare metal with toxic effects notably harmful to human health and the environment. In this article, the natural occurrence of Tl was evaluated in a deactivated manganese mine located in the Western region of Bahia, Brazil. The extraction procedure with aqua regia was used to dissolve the soil, sediment, and tailings samples. The Tl content was determined by differential pulse anodic stripping voltammetry (DPASV) and manganese (Mn) and iron (Fe) by flame atomic absorption spectroscopy (FAAS). The Tl levels ranged from 0.64 to 473 mg kg‑1, triggering an alert since most of the samples (soil and sediment) analyzed presented Tl concentrations above 1.0 mg kg-1, recognized as the maximum limit recommended by environmental agencies in North America and Europe.
Daneysa Lahis Kalschne, Cristiane Canan, Murilo Oliveira Beato, Oldair Donizete Leite, and Eder Lisandro Moraes Flores
Elsevier BV
Daneysa Lahis Kalschne, Cristiane Canan, Juliano Smanioto Barin, Rochele Sogari Picoloto, Oldair Donizete Leite, and Eder Lisandro Moraes Flores
Springer Science and Business Media LLC
Jorge Luís O. Santos, Oldair Leite, Clayton Ricardo Janoni, Djane de Jesus, and Ana Maria Pinto dos Santos
Sociedade Brasileira de Quimica (SBQ)
Enoc Lima do Rego, Daniel Batista Gomes, Jorge Da Silva Júnior, Diego Lucena Herok, Eneas Denieste de Oliveira Porto, and Oldair Donizeti Leite
Instituto de Quimica - Univ. Federal do Mato Grosso do Sul
For the diagnosis of the quality of water it is necessary to execute a set of analyzes (physical and chemical) of the body of water that will provide information that integrate biotic and abiotic factors that govern the functioning of the ecosystem. The objective of this study is to evaluate the quality of water from wells and rivers of Urucuia aquifer region for investigation of contamination or contamination risks. Were realize collections in nine (9) areas of western Bahia, which were collect in each area, two points of well water samples and a river, and determining the electrical conductivity, pH, dissolved ions and metals. The results were compare with the maximum permissible values (MPV) for human consumption by Ordinance No. 2914/11 of the Ministry of Health and National Environment Counsel - CONAMA (Resolution 357 and supplementary resolutions). The quantitative results of the analysis showed that the surface and well waters that are part of the aquifer Urucuia within the parameters investigated are below the values recommended by the legislation showing that the agricultural activities in the region has not affected to the evaluated parameters, the quality of water for human consumption. However, it is necessary a monitoring of surface and groundwater in the region with expansion parameters evaluated. DOI: http://dx.doi.org/10.17807/orbital.v9i2.880
José Domingos Santos Da Silva, Michely Oliveira Madureira, Gabriel Macedo Dos Anjos, Caroline Oliveira Pinto, Oldair Donizeti Leite, and João Victor Da Silva Santos
Instituto de Quimica - Univ. Federal do Mato Grosso do Sul
The use of pesticides has intensified with agricultural modernization process, triggered by the Green Revolution, which brought about changes in the production system, resulting in high social costs, environmental and public health. Brazil is the world's largest consumer of pesticides and assesses that this market will grow even more in the near future. Given the risk that pesticides pose, it was found that there is an urgent need to intensify the studies, as are scarce research in the Northeast and especially in western Bahia. This research aimed to evaluate the scientific literature on pesticides in West of Bahia. Therefore, publications consultation was made in the database Portal.periodicos.Capes with the keywords "West of Bahia" and "Pesticides". The results show that the number of worldwide publications has been growing over the years, representing 98% of the total, while Brazil has only 2% in West of Bahia was not found publication. There are many challenges in front of the dimension that the theme "pesticide" offers. Thus, priorities and strategies for research should be defined, seeking to boost scientific productivity in an attempt to make changes to help chart a way to sustainable development. DOI: http://dx.doi.org/10.17807/orbital.v9i2.909
Jorge Luís O. Santos, Oldair D. Leite, Anete D. M. Vieira, Djane S. Jesus, and Marcos Y. Kamogawa
Sociedade Brasileira de Quimica (SBQ)
A webcam is proposed as the detector in a flow system with multicommutation, and the feasibility of the approach is demonstrated in the determination of nitrate and nitrite in natural waters. The typical transient signal inherent to the flow system was obtained using a digital video and quantified by ImageJ software. The linear dynamics range for nitrite and nitrate determinations were 0.2 to 2.0 mg L-1 NO2− and 1.0 to 10.0 mg L-1 NO3−, with relative standard deviation < 2% for both analytes. The limits of detection were 0.01 and 0.04 mg L-1 for nitrite for nitrate, respectively, and the sampling rate were 80 and 103 h-1 for nitrite and nitrate, respectively. The use of webcams has a high potential for analysis in the visible region of the electromagnetic spectrum, and the proposed strategy constitutes a promising alternative to traditional absorbance measurements that depend on conventional equipment. The webcam detection system is attractive, especially in relation to field analysis.
Oldair D Leite, Heberth J Vieira, Orlando Fatibello-Filho, and Fábio R. P Rocha
FapUNIFESP (SciELO)
A multicommuted flow-based procedure with detection by chemiluminescence for the determination of total and free cholesterol without changes in the flow manifold is proposed. Cholesterol esterase and cholesterol oxidase were both immobilized on glass beads via glutaraldehyde/(3-aminopropyl)-triethoxysilane and mini-columns containing the enzymes were used for online sample treatment. Cholesterol esters were cleaved to cholesterol and fatty acids at the packed reactor containing cholesterol esterase. The reactor containing cholesterol oxidase converted cholesterol to cholest-4-en-3-one also yielding hydrogen peroxide. Detection was based on the chemiluminescence produced by H2O2 in the hexacyanoferrate(III)-luminol system. Influence of both chemical and hydrodynamic variables on the chemiluminescence signals were investigated. The analytical curves were linear from 250 to 2500 mg L-1 and from 500 to 4000 mg L-1, for free and total cholesterol, respectively. Detection limits for both analytes were estimated as 60 mg L-1 at 99.7% confidence level. The sampling rate was 55 h-1 and reagent consumption was 350 µg of luminol and 2.6 mg of potassium hexacyanoferrate(III) per determination. The procedure developed was successfully applied for determination of cholesterol in eggs and in human blood serum with results in agreement with the reference spectrophotometric method at the 95% confidence level.
Geiser G. Oliveira, Bruno C. Janegitz, Marina B. Batistão, Fernanda H. Salami, Orlando Fatibello-Filho, and Oldair D. Leite
FapUNIFESP (SciELO)
A flow injection chemiluminescence method for the determination of paracetamol in pharmaceutical formulations is described. It is based on the consumption of the sodium hypochlorite by paracetamol and decreases of the analytical signal. The analytical curve was linear in the paracetamol concentration range from 5.0 x 10-6 to 5.0 x 10-5 mol L-1, with a detection limit of 1.8 x 10-6 mol L-1. The RSDs were 2.0 and 1.2% respectively for 2.0 x 10-5 and 4.0 x 10-5 mol L-1 paracetamol solutions (n = 10) and a sampling frequency of 180 h-1 was obtained.