Search Results - "Machado De Carvalho, Leandro"

Determination of phenolic and triterpenic compounds in Jatropha gossypiifolia L by Ultra-high performance liquid chromatography-tandem mass spectrometric (UHPLC-MS/MS) by Silveira, Rudinei da Silva, Leal, Gabriela Camera, Molin, Thais Ramos Dal, Faccin, Henrique, Gobo, Luciana Assis, Silveira, Géssica Domingos da, Souza, Mariana Tatsch da Silva, Lameira, Osmar Alves, Carvalho, Leandro Machado de, Viana, Carine

“…This work describes the chemical characterization of extracts of Jatropha gossypiifolia (from Amazonia region) concerning the presence of phenolic and…”
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Pulsed voltammetric/amperometric detection of polycyclic aromatic sulfur heterocycles (PASHs) at the gold disc electrode for studies in petroleum asphalts by Schmidt, Patrícia, Goularte, Rayane Bueno, Cargnin, Rejane Secretti, Do Nascimento, Paulo C., de Carvalho, Leandro Machado

“…This work describes the voltammetric and amperometric behavior of a high number of PASHs (sulfides, thiophenes, benzothiophenes, dibenzothiophenes,…”
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Regulatory framework for dietary supplements and the public health challenge by Molin, Thaís Ramos Dal, Leal, Gabriela Camera, Müller, Larissa Sabo, Muratt, Diana Tomazzi, Marcon, Gabriela Zanella, Carvalho, Leandro Machado de, Viana, Carine

“…The new regulatory framework for dietary supplements in Brazil prompted this analysis of the current outlook of these products and the challenges posed by the…”
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Indirect Electrochemical Sensing of Radicals and Radical Scavengers in Biological Matrices by Scholz, Fritz, López de Lara González, Gabriela, Machado de Carvalho, Leandro, Hilgemann, Maurício, Brainina, Khenia Z, Kahlert, Heike, Jack, Robert Smail, Minh, Dang Truong

“…Breaking cover: Hydroxyl radicals OH. destroy the self‐assembled monolayer (SAM) of hexanethiol on gold and mercury electrodes and thus allow the…”
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Electrochemical Assay to Quantify the Hydroxyl Radical Scavenging Activity of Medicinal Plant Extracts by Hilgemann, Maurício, Scholz, Fritz, Kahlert, Heike, de Carvalho, Leandro Machado, da Rosa, Marcelo Barcellos, Lindequist, Ulrike, Wurster, Martina, do Nascimento, Paulo C., Bohrer, Denise

“…A new electrochemical assay has been developed which is based on quantifying the attack of OH. radicals on a self‐assembled thiol monolayer on electrodes in…”
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Simultaneous determination of Ba, Co, Fe, and Ni in nuts by high-resolution continuum source atomic absorption spectrometry after extraction induced by solid-oil-water emulsion breaking by Rovasi Adolfo, Franciele, Cícero do Nascimento, Paulo, Brudi, Letícia, Bohrer, Denise, Machado de Carvalho, Leandro

“…[Display omitted] •A simple, low-cost and fast extraction method was developed;•Extraction of Ba, Co, Fe and Ni was achieved by breaking a solid-oil-water…”
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A new method based on extraction induced by emulsion breaking for determination of Co and Ni in chocolate bars by graphite furnace atomic absorption spectrometry by Rovasi Adolfo, Franciele, Balczareki Lucena, Nicoly, Trombe Do Valle, Lucas, Machado De Carvalho, Leandro, Noremberg Kunz, Simone

“…This paper describes a new experimental configuration of extraction induced by emulsion breaking method to extract and determine Ni and Co in chocolate bars by…”
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Extraction induced by emulsion breaking for simultaneous determination of Co, Fe and Ni in petroleum asphalt cement by high-resolution continuum source atomic absorption spectrometry by Rovasi Adolfo, Franciele, Cícero do Nascimento, Paulo, Bohrer, Denise, Viana, Carine, Machado de Carvalho, Leandro, Coutinho Cravo, Margareth C., Nascimento, Luis

“…[Display omitted] •New extraction method for Co, Fe and Ni determination in asphalt is proposed.•Method simpler and faster than methods of total digestion of…”
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Diagnóstico de emissões de poluentes atmosféricos na produção de misturas asfálticas by Pontes Maia Pires Alcantara, Amanda, Pereira Ribeiro, Jefferson, Rocha Segundo, Iran Gomes da, Barbosa da Silva, Débora, Machado de Carvalho, Leandro, Dognini, Jocinei, Santos Almeida Oliveira Carneiro, Joaquim Alexandre, De Sousa, Francisco Wagner, Castelo Branco, Verônica Teixeira Franco

“…Os pavimentos asfálticos são comumente utilizados em grandes centros urbanos no Brasil. No entanto, vários contaminantes do ar são emitidos durante o ciclo de…”
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Extraction induced by emulsion breaking to assay Cr, Cu and Mn in asphalt samples by high-resolution continuum source atomic absorption spectrometry and its comparison with other sample preparation methods by Adolfo, Franciele Rovasi, Cícero do Nascimento, Paulo, Brudi, Letícia, Bohrer, Denise, Machado de Carvalho, Leandro, Coutinho Cravo, Margareth C., Nascimento, Luis

“…This paper reports the development of a method based on the extraction induced by emulsion breaking (EIEB) for the determination of Cr, Cu and Mn in asphalt by…”
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A liquid chromatography-atmospheric pressure photoionization tandem mass spectrometric (LC-APPI-MS/MS) method for the determination of triterpenoids in medicinal plant extracts by Gobo, Luciana Assis, Viana, Carine, Lameira, Osmar Alves, de Carvalho, Leandro Machado

“…An analytical method using liquid chromatography‐atmospheric pressure photoionization tandem mass spectrometry with toluene as a dopant was developed for the…”
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Distribution of metals in different environmental compartments and oxidative stress biomarkers in Bryconops caudomaculatus (Osteichthyes: Characiformes) from a bauxite mining area in the Eastern Amazon by Cantanhêde, Sildiane Martins, de Carvalho, Irina Sofia Cardoso, Adolfo, Franciele Rovasi, Leal, Gabriela, Reis, Gabriel Moraes, de Carvalho, Leandro Machado, de Assis Montag, Luciano Fogaça, Amado, Lílian Lund

“…The Eastern Amazon is rich in bauxite ore. The extraction and processing of bauxite lead to the mobilization of Aluminum (Al) and other metals in…”
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Evaluation of aging processes of petroleum asphalt cements by solid state electrochemical monitoring by da Silveira, Géssica Domingos, de Carvalho, Leandro Machado, Montoya, Noemí, Domenech-Carbó, Antonio

“…The changes in the chemistry of organosulfur compounds from asphalt cements during aging are studied using solid state voltammetry of immobilized…”
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Silver nano/microparticle toxicity in the shrimp Litopenaeus vannamei (Boone, 1931) by Buitrago, Sonia Astrid Muñoz, Colombo, Grecica Mariana, Buitrago, Juan Rafael, Gomes, Robson Matheus Marreiro, de Sousa, Alan Carvalho, Pedrosa, Virgínia Fonseca, Romano, Luís Alberto, de Carvalho, Leandro Machado, Adolfo, Franciele Rovasi, Junior, Wilson Wasielesky, Josende, Marcelo Estrella, Monserrat, José Maria

“…The effects of silver nano/microparticles (AgP) on juvenile Litopenaeus vannamei shrimp were evaluated through several responses, aiming to use it as a…”
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Elemental Analysis of Pharmaceutical Products for Chronic Kidney Disease by High-Resolution Continuum Source Graphite Furnace Atomic Absorption Spectrometry (HR-CS GFAAS) by Maziero, Maiara, Adolfo, Franciele Rovasi, Camera Leal, Gabriela, de Carvalho, Leandro Machado, Nascimento, Paulo Cícero do, Viana, Carine

“…Here is reported the development of methods for the determination of Al, Cd, Cu, Mo, and Pb by high-resolution continuum source graphite furnace atomic…”
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A cleanup method using solid phase extraction for the determination of organosulfur compounds in petroleum asphalt cements by da Silveira, Géssica Domingos, Hoinacki, Chrys Katielli, Bueno Goularte, Rayane, Do Nascimento, Paulo C., Bohrer, Denise, Cravo, Margareth, Leite, Leni F.M., de Carvalho, Leandro Machado

“…[Display omitted] •Cleanup method for the determination of model organosulfur compounds in asphalt cements.•Use of a commercially available aminopropyl…”
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Screening of pharmacologic adulterant classes in herbal formulations using voltammetry of microparticles by Doménech-Carbó, Antonio, Martini, Mariele, de Carvalho, Leandro Machado, Viana, Carine, Doménech-Carbó, María Teresa, Silva, Miguel

“…[Display omitted] ► Screening of different families of adulterants is obtained by voltammetry of microparticles. ► Application to identify synthetic…”
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Analysis of Pharmacologic Adulteration in Dietary Supplements by Capillary Zone Electrophoresis Using Simultaneous Contactless Conductivity and UV Detection by Müller, Larissa Sabo, Muratt, Diana Tomazi, Molin, Thaís Ramos Dal, Urquhart, Carolina Gonzalez, Viana, Carine, de Carvalho, Leandro Machado

“…The consumption of dietary supplements is increasing every year all over the world. In addition, the consumption has been accompanied by the increased…”
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Reversed-Phase High-Performance Liquid Chromatography for the Determination of 15 Rare Earth Elements in Surface Water Sample Collected in a Mining Area from Lavras do Sul/RS, Brazil by Colim, Alexsandro Nunes, do Nascimento, Paulo Cícero, Wiethan, Bruna Avila, Adolfo, Franciéle Rovasi, Dresch, Lucielle Codeim, de Carvalho, Leandro Machado, Bohrer, Denise, da Rosa, Marcelo Barcellos

“…A methodology was developed to assay 15 rare earth elements (REE) (La to Lu and Y) in a surface water sample from a mining area. The samples were collected in…”
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Determination of Rare Earth Elements in Natural Water Samples by Rapid Sequential High-Resolution Continuum Source Flame Atomic Absorption Spectrometry (HR CS FAAS) and inductively Coupled Plasma-Mass Spectrometry (ICP-MS) by Avila Wiethan, Bruna, Cícero do Nascimento, Paulo, Nunes Colim, Alexsandro, Fagundes Guarda, Ananda, Rovasi Adolfo, Franciele, da Rosa, Marcelo Barcellos, de Carvalho, Leandro Machado, Bohrer, Denise

“…A method was developed to sequentially assay ten rare earth elements by high-resolution continuum source flame atomic absorption spectrometry. The rare earth…”
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