Patrícia Valderrama
Federal University of Technology - Paraná
StatisticsAnalytical chemistryDetection limitChemometricsArtificial intelligenceCalibrationPattern recognitionChemistryUnivariatePartial least squares regressionPrincipal component analysisAntioxidantMultivariate calibrationFood scienceSpectroscopyMathematicsNear-infrared spectroscopyChromatographyUltraviolet visible spectroscopyLinear discriminant analysis
Publications 116
#1Michel Rocha Baqueta (State University of Campinas)H-Index: 5
#2Fernanda Pizano (State University of Campinas)
Last. Juliana Azevedo Lima Pallone (State University of Campinas)H-Index: 14
view all 7 authors...
Abstract null null Rapadura is an artisanal candy obtained from concentrated sugarcane juice. In this study, a differentiation between South American rapadura producers has been tried using a Kurtosis-based projection pursuit analysis (kPPA) concerning essential minerals, acrylamide, moisture contents, pH, and color. These parameters revealed significant inter- and intra-country differences. Based on the employed measurements, a multivariate exploration with kPPA extracted information from rapad...
#1Vanessa Jorge dos Santos (UEM: Universidade Estadual de Maringá)H-Index: 4
Last. Jesuí Vergílio Visentainer (UEM: Universidade Estadual de Maringá)H-Index: 46
view all 5 authors...
Abstract null null Human milk (HM) modifications over time represent an important issue. This work proposed to evaluate the changes in HM during one-year storage through total lipids (TL) degradation and portable near-infrared (NIR) spectrometer combined with chemometrics. Colostrum, transition, and mature stages were obtained from donors and considered in the raw and pasteurized forms. Principal component analysis in TL content showed changes in the mature stages for both forms after 75 days. M...
#1Leonardo Valderrama (UFSC: Universidade Federal de Santa Catarina)H-Index: 4
Last. Eduardo Carasek (UFSC: Universidade Federal de Santa Catarina)H-Index: 39
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Abstract null null Carbendazim (CBZ) is a fungicide employed in grape crop disease controls, and its maximum residue limit in food is regulated by specialized agencies. This study aimed to determine the CBZ content in the grape juices in a semi-quantitative classification model based on portable Ultraviolet–Visible spectroscopy and partial least squares with discriminant analysis. The sensitivity and specificity of the obtained model ranged from 83 to 100%, with the external validation set. Thes...
Abstract null null Organic food consumption has increased significantly over time. This contributes to the increased demand and price of this kind of food. Among the organic products, cinnamon stands out for its characteristic flavor and bioactive compounds. Thus, the work aimed to verify the potentials of attenuated total reflectance Fourier transform mid-infrared spectroscopy (ATR-FT-MIR) coupled with Parallel Factor Analysis (PARAFAC) for evaluation of cinnamon organic samples. As result, the...
Last. Fernanda Vitória LeimannH-Index: 17
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O desenvolvimento de uma metodologia alternativa foi conduzido para a determinacao de parâmetros de textura em farinhas de diferentes composicoes, com o objetivo de promover a utilizacao da tecnica da espectroscopia na regiao do infravermelho proximo (NIR), descartando assim o uso de reagentes e geracao de residuos e viabilizando analises mais rapidas. O modelo multivariado por minimos quadrados parciais (PLS) apresentou valores do erro medio quadratico da calibracao (RMSEC) e validacao (RMSEP) ...
#2Aline CoqueiroH-Index: 10
Last. Patrícia ValderramaH-Index: 19
view all 6 authors...
Abstract Coffee quality is determined by several factors and, in the chemometric domain, the multi-block data analysis methods are valuable to study multiple information describing the same samples. In this industrial study, the Common Dimension (ComDim) multi-block method was applied to evaluate metabolite fingerprints, near-infrared spectra, sensory properties, and quality parameters of coffee blends of different cup and roasting profiles and to search relationships between these multiple data...
Coagulation and flocculation are two of the steps in the water treatment process in which chemical coagulants based on iron salts or aluminum are used. In order to replace the aluminum or to reduce the concentration of the metal, several natural alternatives to assist in the coagulation/flocculation process have been evaluated, including the use of Abelmoschus escuentus Moench (okra) as a flocculating agent. To determine the degradation time of the okra solution, spectral measurements were perfo...
#3Makoto Matsushita (UEM: Universidade Estadual de Maringá)H-Index: 35
Abstract null null Kurtosis-based projection pursuit analysis (kPPA) has demonstrated the ability to visualize multivariate data in a way that complements other exploratory data analysis tools, such as principal components analysis (PCA). It is especially useful for partitioning binary data sets (2k classes) with a balanced design. Since kPPA is not a variance-based method, it can often provide unsupervised class separation where other methods fail. However, when multiple classifications are pos...
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