4 documents found, page 1 of 1
Study of Inorganic Profiles of Street Cocaine Samples Using ICP-MS and ICP OES
Amorim,Zanata B.; Machado,Maiara P.; Moro,Mariana K.; Rebouças,Laura O.; Dalfior,Bruna M.; Romão,Wanderson; Filgueiras,Paulo RobertoDetermining inorganic constituents in illicit drugs can indicate its purity and presence of adulterants. In this study, we analyzed 52 street cocaine samples, seized in three different regions of Espírito Santo, state of Brazil. Inductively coupled plasma optical emission spectrometry was used to determine Al, Ca, Cu, Fe, Mn, Mg, Zn concentrations and inductively coupled plasma mass spectrometry to determine Mo...
Multi-Element Evaluation in Black Pepper (Piper nigrum L.) According to the Pro...
Krause,Maiara; Vieira,Luiza V.; Cunha,Tiago P.; Brandão,Geisamanda P.; Filgueiras,Paulo Roberto; Carneiro,Maria Tereza W. D.Black pepper is one of the most consumed spices worldwide and the evaluation of trace elements content is essential to promote consumer safety. In this study, concentrations of the elements As, Cd, Co, Cu, Fe, Mn, Mo, Ni, Pb, Se, V and Zn was determined in samples of black peppercorn (n = 25) and ground black pepper (n = 25) to verify how processing affects element concentrations. The elements were determined b...
EXPERIMENTO DIDÁTICO DE QUIMIOMETRIA PARA CLASSIFICAÇÃO DE ÓLEOS VEGETAIS COMES...
Santana,Felipe Bachion de; Souza,André Marcelo de; Almeida,Mariana Ramos; Breitkreitz,Márcia Cristina; Filgueiras,Paulo Roberto; Sena,Marcelo MartinsA teaching experiment on supervised pattern recognition in chemometrics was proposed in this tutorial to introduce partial least squares discriminant analysis (PLS-DA). A new approach of the experiment published in the first tutorial of this series was revisited and employed to the classification of edible vegetable oils. The spectra of olive, canola, soybean and corn oils were obtained using an attenuated tota...
Experimento didático de quimiometria para calibração multivariada na determinaç...
Souza,André Marcelo de; Breitkreitz,Márcia Cristina; Filgueiras,Paulo Roberto; Rohwedder,Jarbas José Rodrigues; Poppi,Ronei JesusThe aim of this manuscript was to show the basic concepts and practical application of Partial Least Squares (PLS) as a tutorial, using the Matlab computing environment for beginners, undergraduate and graduate students. As a practical example, the determination of the drug paracetamol in commercial tablets using Near-Infrared (NIR) spectroscopy and Partial Least Squares (PLS) regression was shown, an experimen...