RSS 1.0Artigos - Química Analítica - IQ
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Biotransformation of disperse dyes using nitroreductase immobilized on magnetic particles modified with tosyl group: Identification of products by LC-MS-MS and theoretical studies conducted with DNA
Franco, Jefferson Honorio
; da Silva, Bianca F. ; ; ; ; Zanoni, Maria Valnice Boldrin (Environmental Pollution, 2018) [Artigo]
The present work evaluates the action of nitroreductase enzyme immobilized on Tosylactivated magnetic particles (MP-Tosyl) on three disperse dyes which contain nitro and azo groups. The dyes included Disperse Red 73 (DR ... -
Thermoanalytical and dynamic mechanical analysis of commercial geomembranes used for fluid retention of leaching in sanitary landfills
; ; ; Ribeiro, Clovis Augusto (Journal of Thermal Analysis and Calorimetry, 2018) [Artigo]
Studying thermal behavior is very important for monitoring the quality of polymers on an industrial scale. Commercial geomembranes are materials with low permeability that can be used for multiple purposes, such as ... -
Evaluation of an improved closed-vessel conductively heated digestion system for the analysis of raw meat samples by ICP techniques
Vieira, Alan Lima; ; Virgilio, Alex ; Ferreira, Edilene Cristina ; Gomes Neto, José Anchieta (Journal of Analytical Atomic Spectrometry, 2018) [Artigo]
In this work, an improved conductively heated digestion system (CHDS) with closed vessels, which provides simpler, easier and safer digestion of raw chicken, beef and pork meat samples aiming at Ca, Cu, Fe, K, Mg, Mn, Na, ... -
Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II) transition metals isonicotinate complexes: Thermal behavior in N2 and air atmospheres and spectroscopic characterization
Nunes, Wilhan Donizete Gonçalves; Teixeira, José Augusto ; Ekawa, Bruno ; do Nascimento, André Luiz Carneiro Soares ; Ionashiro, Massao ; Caires, Flávio Junior (Thermochimica Acta, 2018) [Artigo]
Solid-state M(IN)2·nH2O complexes, where M stands for bivalent transition metals (Mn, Fe, Co, Ni, Cu and Zn), IN is isonicotinate and n = 0.5 to 4.0 H2O, were synthesized. Characterization and thermal behavior of the ... -
A paper platform for colorimetric determination of aluminum hydrochloride in antiperspirant samples
Silvestre, Amanda Letícia Polli; Milani, Maria Izabel ; Rossini, Eduardo Luiz ; Pezza, Leonardo ; Pezza, Helena Redigolo (Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 2018) [Artigo]
A simple, fast, low-cost, portable, and eco-friendly method using a spot test on a paper platform, together with diffuse reflectance spectroscopy, was developed and validated for the quantification of aluminum hydrochloride, ... -
Influence of auxochrome group in disperse dyes bearing azo groups as chromophore center in the biotransformation and molecular docking prediction by reductase enzyme: Implications and assessment for environmental toxicity of xenobiotics
Franco, Jefferson Honorio; da Silva, Bianca F. ; ; ; ; Zanoni, Maria Valnice Boldrin (Ecotoxicology and Environmental Safety, 2018) [Artigo]
Synthetic azo dyes have increasingly become a matter of great concern as a result of the genotoxic and mutagenic potential of the products derived from azo dye biotransformation. This work evaluates the manner in which ... -
Study of the thermal behavior in solid state of Mn(II)-Diclofenac complex
; ; De Almeida, Adélia Emília; Ribeiro, Clóvis Augusto ; Crespi, Marisa Spirandeli (Ecletica Quimica, 2018) [Editorial]
The preparation, characterization and thermal behavior of Mn(II)-diclofenac solid-state complex was investigated by simultaneous TG/DTA and DTG curves, DSC, X-ray powder diffraction (XRD) and scanning electron microscopy ... -
Laser-induced breakdown spectroscopy determination of K in biochar-based fertilizers in the presence of easily ionizable element
de Morais, Carla Pereira; Barros, Ariane Isis ; Bechlin, Marcos André ; Silva, Tiago Varão ; ; ; Crespi, Marisa Spirandeli ; Ribeiro, Clóvis Augusto ; Gomes Neto, José Anchieta ; Ferreira, Edilene Cristina (Talanta, 2018) [Artigo]
Laser-induced breakdown spectroscopy is an optical emission technique quite suitable for the analysis of recalcitrant materials as it eliminates complex procedures of sample preparation. However, for some simple LIBS ... -
A simple electrochemical method to monitor an azo dye reaction with a liver protein
Materón, Elsa Maria; Marchetto, Reinaldo ; Araujo, Angela Regina ; Vega-Chacon, Jaime ; ; Jafelicci, Miguel ; ; ; Zanoni, Maria Valnice Boldrin (Analytical Biochemistry, 2018) [Artigo]
Disperse Orange 37 (DO37) is an efficient azo dye for dyeing synthetic textile materials owing to its resistance to degradation that may also be harmful to humans as DO37 is not entirely eliminated in wastewater treatment. ... -
Reagentless Detection of Low-Molecular-Weight Triamterene Using Self-Doped TiO2 Nanotubes
Hudari, Felipe F.; Bessegato, Guilherme G. ; Bedatty Fernandes, Flávio C. ; Zanoni, Maria V. B. ; Bueno, Paulo R. (Analytical Chemistry, 2018) [Artigo]
TiO2 nanotube electrodes were self-doped by electrochemical cathodic polarization, potentially converting Ti4+ into Ti3+, and thereby increasing both the normalized conductance and capacitance of the electrodes. One-hundred ... -
4-hydrazinobenzoic acid as a derivatizing agent for aldehyde analysis by HPLC-UV and CE-DAD
; ; ; ; ; Cardoso, Arnaldo A.; ; (Talanta, 2018) [Artigo]
Aldehydes are relevant analytes in a wide range of samples, in particular, food and beverages but also body fluids. Hydrazines can undergo nucleophilic addition with aldehydes or ketones giving origin to hydrazones (a group ... -
Enhanced detection of ponceau 4r food dye by glassy carbon electrode modified with reduced graphene oxide
de Moraes, Paloma B.; Hudari, Felipe F. ; Silva, João P. ; Zanoni, Maria V. B. (Journal of the Brazilian Chemical Society, 2018) [Artigo]
This paper reports the development of a glassy carbon electrode modified with a reduced graphene oxide (r-GO/GCE) for the determination of the food dye named Ponceau 4R (PNC). The modified sensor presented excellent signal ... -
Colorimetric paper-based device for gaseous hydrogen cyanide quantification based on absorbance measurements
Petruci, João Flávio da Silveira; ; Cardoso, Arnaldo Alves (Sensors and Actuators, B: Chemical, 2018) [Artigo]
Hydrogen cyanide is a highly toxic compound employed for applications such as electroplating, production of organic solvents, fish stunning, and even as a chemical weapon. In this work, we describe a new microfluidic ... -
Assessment of several advanced oxidation processes applied in the treatment of environmental concern constituents from a real hair dye wastewater
Bessegato, Guilherme Garcia; De Souza, João Carlos ; Cardoso, Juliano Carvalho ; Zanoni, Maria Valnice Boldrin (Journal of Environmental Chemical Engineering, 2018) [Artigo]
Currently, little information is available regarding the presence of compounds from raw hair dyeing wastewater. It is known that the most commonly commercial formulations contain components with toxic properties and some ... -
Contribution of thin films of ZrO2 on TiO2 nanotubes electrodes applied in the photoelectrocatalytic CO2 conversion
Perini, João A. Lima; Cardoso, Juliano C. ; Brito, Juliana F. De ; Zanoni, Maria V. Boldrin (Journal of CO2 Utilization, 2018) [Artigo]
Zirconium dioxide (ZrO2) nanoparticles deposited on TiO2 nanotube (NT) surfaces (30nm of diameter) improved the photoelectrocatalytic conversion of carbon dioxide to fuel alcohol. The deposition of ZrO2 nanoparticles was ... -
A Hyphenated Preconcentrator-Infrared-Hollow-Waveguide Sensor System for N2O Sensing
Da Silveira Petruci, João Flavio; ; Cardoso, Arnaldo Alves ; (Scientific Reports, 2018) [Artigo]
Following the Kyoto protocol, all signatory countries must provide an annual inventory of greenhouse-gas emission including N2O. This fact associated with the wide variety of sources for N2O emissions requires appropriate ... -
Desenvolvimento de método espectrofotométrico ambientalmente mais limpo para análise de nitrito em salsichas
Martins, Ângela Pinheiro; Luiz, Vitor Hugo Marques ; Pezza, Leonardo ; Pezza, Helena Redigolo (Ecletica Quimica, 2015) [Artigo]
A clean environmental spectrophotometric method for the analysis of nitrite using a new diazotizing reagent is reported. The proposed method is based on diazotization-coupling reaction between dapsone, nitrite and ... -
Electrochemical decolorization of Rhodamine B dye: Influence of anode material, chloride concentration and current density
Baddouh, Ali; Bessegato, Guilherme Garcia ; ; ; ; ; Zanoni, Maria Valnice Boldrin (Journal of Environmental Chemical Engineering, 2018) [Artigo]
Surface water contamination by dyes released from a variety of industries is an environmental problem of great concern. However, electrochemical oxidation is a promising alternative for water treatment. In this paper, we ... -
Determinations of phosphorus in fertilizers by spark discharge-assisted laser-induced breakdown spectroscopy
Vieira, Alan Lima; Silva, Tiago Varão ; ; ; ; Ferreira, Edilene Cristina ; Neto, José Anchieta Gomes (Microchemical Journal, 2018) [Artigo]
A spark discharge system was coupled to laser-induced breakdown spectroscopy (SD-LIBS) to improve sensitivity in the determination of P in fertilizers. A LIBS system consisting of a Q-switched Nd:YAG laser operating at ... -
Ultrasensitive determination of malathion using acetylcholinesterase immobilized on chitosan-functionalized magnetic iron nanoparticles
Rodrigues, Núbia Fernanda Marinho; ; ; ; Yamanaka, Hideko (Biosensors, 2018) [Artigo]
A renewable, disposable, lowcost, and sensitive sensor for the detection of organophosphorus pesticides was constructed by immobilizing the acetylcholinesterase enzyme (AChE), via glutaraldehyde, on magnetic iron nanoparticles ...