2003
DOI: 10.1021/ed080p541
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Classification of Vegetable Oils by Principal Component Analysis of FTIR Spectra

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Cited by 54 publications
(35 citation statements)
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“…Infrared (IR) spectroscopy is also known as a very helpful way to study lipid degradation under oxidative conditions [113], particularly since it is an easy, rapid, economical and non- IR has been applied to measure the peroxide value in oxidized lipids [115] and differences were found in the IR spectra of fresh and aged oils [116,117]; so IR spectra can be used to characterize the aging of various edible oils [118][119][120][121][122]. The investigation of the FTIR spectra of the treated oils revealed that the microwave heating of oils [123] caused significant changes in the intensities of their absorption bands and produced no shifts in the position of the bands.…”
Section: Infrared Spectroscopymentioning
confidence: 99%
“…Infrared (IR) spectroscopy is also known as a very helpful way to study lipid degradation under oxidative conditions [113], particularly since it is an easy, rapid, economical and non- IR has been applied to measure the peroxide value in oxidized lipids [115] and differences were found in the IR spectra of fresh and aged oils [116,117]; so IR spectra can be used to characterize the aging of various edible oils [118][119][120][121][122]. The investigation of the FTIR spectra of the treated oils revealed that the microwave heating of oils [123] caused significant changes in the intensities of their absorption bands and produced no shifts in the position of the bands.…”
Section: Infrared Spectroscopymentioning
confidence: 99%
“…Para fazer a correção, o método MSC assume que cada espectro é determinado pelas características químicas da amostra somadas às características físicas indesejadas. A Equação 6 descreve o princípio de funcionamento do MSC: (6) onde: x ik (original) e x ik (transformado) são os valores de absorbância antes e depois de correção com o MSC em k comprimentos de onda; a i e b i são constantes estimadas a partir de uma regressão em mínimos quadrados de um espectro individual x ik contra um espectro médio do conjunto de calibração em todos os comprimentos de onda ou em um subconjunto, seguindo a Equação 7:…”
Section: (4)unclassified
“…Na calibração multivariada, busca-se estabelecer um modelo que relacione uma série de medidas (químicas ou espectrais) realizadas em amostras com uma determinada propriedade (concentração, por exemplo). Na literatura podem ser encontrados diversos experimentos didáticos em calibração multivariada, 2-4 reconhecimento de padrões 5,6 e planejamento de experimentos. 7 A análise de componentes principais (Principal Component Analysis, PCA) é um dos métodos mais importantes utilizados na Quimiometria e é a base para diversos métodos de reconhecimento de padrões, classificação e calibração multivariada.…”
Section: Introductionunclassified
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“…Analysis of the collected data can be done using univariate or selective group frequency assignments or by means of multivariate statistical methods of analysis such as Principal component analysis (PCA). Martin et al [2] used FTIR and covariance-PCA to classify vegetable oils. Kraft et al [3] used first derivatives of normalized spectra to classify different polymers using spectral imaging in an online process.…”
Section: Introductionmentioning
confidence: 99%