Análise multicomponente simultânea por espectrofotometria de absorção molecular UV-VIS

Saldanha, Teresa Cristina Bezerra; Araújo, Mário César Ugulino de; Neto, Benício de Barros

doi:10.1590/s0100-40421999000600012

Cited by 5 publications

(4 citation statements)

References 73 publications

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“…[23][24][25] Many other examples can be found in the review by Brown et al 26 The evolution of multicomponent analysis for UV/VIS spectrophotometry was reassessed recently. 27 Multivariate calibration involves multiple steps of analysis. After preparation of the standard solutions, the calibration stage is very tedious, when carried out in the conventional way.…”

Section: Introductionmentioning

confidence: 99%

Modified microelectrodes and multivariate calibration for flow injection amperometric simultaneous determination of ascorbic acid, dopamine, epinephrine and dipyrone

Matos

Angnes

Araújo

et al. 2000

Analyst

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Flow injection amperometric quantification of ascorbic acid (AA), dopamine (DA), epinephrine (EP) and dipyrone (DI) in mixtures (in the microgram g-1 range) was successfully performed by using an array of microelectrodes with units modified by the electrodeposition of different noble metals, together with multivariate calibration analysis. The four groups of microelectrodes utilized included a pure gold electrode and electrodes modified by electrodeposition of platinum, palladium or a mixture of platinum + palladium. The array of microelectrodes was inserted in a flow cell and the amperometric data acquisition was performed with a four-channel potentiostat. The analysis of the resulting signals was carried out by a multivariate calibration method, using a group of 16 standard mixtures selected by a two-level factorial design. The analysis of synthetic samples and pharmaceutical compounds containing AA and DI led to very similar values to those obtained by the classical iodimetric analysis. The average absolute errors (in microgram g-1) calculated for each analyte were 0.3, 0.2, 0.4 and 0.4 for AA, DA, EP and DI, respectively.

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Section: Introductionmentioning

confidence: 99%

Modified microelectrodes and multivariate calibration for flow injection amperometric simultaneous determination of ascorbic acid, dopamine, epinephrine and dipyrone

Matos

Angnes

Araújo

et al. 2000

Analyst

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“…No Brasil, os estudos de resolução de curvas têm sido muito pouco explorados. Uma busca no ISI mostrou que, dos 572 trabalhos científicos selecionados com a palavra-chave "curve resolution", somente 4 tiveram a participação de autores brasileiros, sendo um deles um trabalho de revisão [45][46][47][48] .…”

Section: Métodos De Resolução De Curvasunclassified

25 anos de quimiometria no Brasil

Neto¹,

Scarmínio²,

Bruns³

2006

Quím. Nova

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25 YEARS OF CHEMOMETRICS IN BRAZIL. Chemometric activities in Brazil are described according to three phases: before the existence of microcomputers in the 1970s, through the initial stages of microcomputer use in the 1980s and during the years of extensive microcomputer applications of the ´90s and into this century. Pioneering activities in both the university and industry are emphasized. Active research areas in chemometrics are cited including experimental design, pattern recognition and classification, curve resolution for complex systems and multivariate calibration. New trends in chemometrics, especially higher order methods for treating data, are emphasized.

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“…[9] e vem sendo muito utilizado na seleção de comprimentos de ondas em aplicações espectroscópicas quantitativas [10][11] . O algoritmo genético funciona simulando matematicamente a teoria de Darwin [9][10][11][12][13][14][15][16][17][18][19][20][21] , sendo aplicado por analogia ao que ocorre no mundo biológico: as condições experimentais (cromossomos), que levam as melhores respostas (indivíduos mais adaptados ao ambiente) tem maior chance de serem selecionadas (sobreviver), sendo transmitidas às novas gerações através da reprodução. Assim, a otimização das respostas (evolução da espécie) é alcançada por meio de recombinação das variáveis (cruzamento de cromossomos) e de algumas modificações aleatórias (mutações de genes).…”

Section: Equaçãounclassified

Algoritmo genético e espectroscopia no infravermelho - algumas aplicações na indústria cosmética

Amendola¹

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Análise multicomponente simultânea por espectrofotometria de absorção molecular UV-VIS

Cited by 5 publications

References 73 publications

Modified microelectrodes and multivariate calibration for flow injection amperometric simultaneous determination of ascorbic acid, dopamine, epinephrine and dipyrone

Modified microelectrodes and multivariate calibration for flow injection amperometric simultaneous determination of ascorbic acid, dopamine, epinephrine and dipyrone

25 anos de quimiometria no Brasil

Algoritmo genético e espectroscopia no infravermelho - algumas aplicações na indústria cosmética

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