Mcr Als
Mostrando 1-12 de 15 artigos, teses e dissertações.
-
1. Errata
Birnessite type manganese oxide (δ-MnO2) was synthesized for use in degradation of the cationic dye methylene blue in aqueous solution. The material was characterized using infrared spectroscopy, X-ray diffraction, and Brunauer-Emmett-Teller (BET) surface area calculations. The removal of the dye from aqueous solutions was evaluated considering the effects
Ambient. constr.. Publicado em: 2020-07
-
2. Application of a Chemometric Method to Interpret Spectrophotometric Data Obtained for Degradation of an Organic Dye in Water Using Manganese Oxide
Birnessite type manganese oxide (δ-MnO2) was synthesized for use in degradation of the cationic dye methylene blue in aqueous solution. The material was characterized using infrared spectroscopy, X-ray diffraction, and Brunauer-Emmett-Teller (BET) surface area calculations. The removal of the dye from aqueous solutions was evaluated considering the effects
J. Braz. Chem. Soc.. Publicado em: 2020-07
-
3. Vibrational Spectroscopy and Chemometrics in Forensic Chemistry: Critical Review, Current Trends and Challenges
The present manuscript makes an extensive review of the scientific approaches developed in the last decade involving infrared and Raman spectroscopy combined with chemometrics for solving several issues in the investigation of the most relevant forensic traces, such as questioned documents and currency, explosives, gunshot residues, illicit drugs and body fl
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
-
4. NIR Monitoring and Modelling of Soybean Oil Methanolysis with Multivariate Curve Resolution-Alternating Least Squares with Correlation Constraint
Near infrared spectroscopy in-line monitoring and modelling of soybean oil methanolysis has been done using multivariate curve resolution alternating least squares (MCR-ALS) with correlation constraint. This constraint allows for quantitation of the methyl ester formed with little calibration effort and the MCR model provides additionally a general descripti
J. Braz. Chem. Soc.. Publicado em: 2017-05
-
5. Synthesis, Optical Characterization, and Size Distribution Determination by Curve Resolution Methods of Water-Soluble CdSe Quantum Dots
In this work a colloidal approach to synthesize water-soluble CdSe quantum dots (QDs) bearing a surface ligand, such as thioglycolic acid (TGA), 3-mercaptopropionic acid (MPA), glutathione (GSH), or thioglycerol (TGH) was applied. The synthesized material was characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), UV-visibl
Mat. Res.. Publicado em: 24/10/2016
-
6. MCR-ALS APLICADO NO MONITORAMENTO QUANTITATIVO DO PROCESSO DE ELETRODEGRADAÇÃO DA ATRAZINA USANDO ESPECTROS UV: RESULTADOS COMPARATIVOS COM HPLC-DAD COMO UM MÉTODO DE REFERÊNCIA
Electrodegradation of atrazine in water was performed using homemade (PA and PB) and purchased (PC) boron-doped diamond anodes. The degradation was monitored off-line by analyzing total organic carbon and high performance liquid chromatography with diode array detector (HPLC-DAD) and at-line by UV spectroscopy. The spectra were recorded every 2 min. The rank
Quím. Nova. Publicado em: 2016-02
-
7. Discrimination of Annona muricata and Rollinia mucosa Extracts by Using Multivariate Curve Resolution and Partial Least-Squares Regression of Liquid Chromatography-Diode Array Data
Species of the Annonaceae family are used in traditional medicine, and several antitumor acetogenins have been isolated from the leaves of Annona muricata and Rollinia mucosa. Leaves samples (self-shaded and sun-exposed) of these species were collected during winter and summer seasons. Extraction media were prepared from mixtures of five solvents according t
J. Braz. Chem. Soc.. Publicado em: 2015-11
-
8. A Fast Chromatographic Method for Determination of Daidzein and Genistein in Spiked Water River Samples Using Multivariate Curve Resolution
This work reports the development of a fast chromatographic methodology for quantitation of two phytoestrogens: daidzein (DAI), and genistein (GEN), in river water samples. The proposed method is based on high performance liquid chromatography-diode array detection (HPLC-DAD) data, and multivariate curve resolution-alternative least square (MCR-ALS) secon
J. Braz. Chem. Soc.. Publicado em: 2015-08
-
9. DEGRADAÇÃO TÉRMICA DE TOCOFEROL E PRODUTOS DE OXIDAÇÃO EM DIFERENTES CLASSES DE AZEITE DE OLIVA UTILIZANDO ESPECTROSCOPIA UV-VIS E MCR-ALS
Extra virgin olive oil, virgin olive oil and mixed oil were analyzed by UV-Vis spectroscopy and Multivariate Curve Resolution with Alternating Least Squares (MCR-ALS). When the oils were heated at high temperatures (frying), oxidation products were formed which were harmful to human health and antioxidants present were degraded. The aim of this study was
Quím. Nova. Publicado em: 2015-07
-
10. Resolução multivariada de curvas com mínimos quadrados alternantes: descrição, funcionamento e aplicações
Multivariate Curve Resolution with Alternating Least Squares (MCR-ALS) is a resolution method that has been efficiently applied in many different fields, such as process analysis, environmental data and, more recently, hyperspectral image analysis. When applied to second order data (or to three-way data) arrays, recovery of the underlying basis vectors in bo
Quím. Nova. Publicado em: 2014
-
11. Aplicação de métodos de resolução de curvas multivariada a dados experimentais gerados por diferentes técnicas analíticas : uma visão exploratória da biossíntese da violaceína / Application of multivariate curve resolution of experimental data generated by several analytical techniques : an exploratory overview of violacein biosynthesis
A aplicação de métodos de resolução de curvas multivariada (MCR-ALS e PARAFAC) a dados de espectroscopia de fluorescência multicomprimento de onda, absorção molecular e cromatografia líquida de ultra eficiência com detecção por espectrometria de massas foi avaliada como um nova e complementar metodologia para se obter informação inicial sobre a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/07/2011
-
12. Emprego de métodos quimiométricos em análises por cromatografia gasosa bidimensional abrangente / Application of chemometric methods in comprehensive two-dimensional gas chromatography analysis
Nesta tese, foram construídos modelos quimiométricos a partir de cromatogramas de diferentes amostras obtidos por cromatografia gasosa bidimensional abrangente com detecção por ionização em chama (GC×GC-FID). Numa primeira aplicação, modelos foram desenvolvidos para identificar adulteração em gasolina. Para isso, uma amostra de gasolina não adult
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/05/2011