期刊
ANALYTICA CHIMICA ACTA
卷 593, 期 1, 页码 54-67出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2007.04.050
关键词
oil oxidation; two-dimensional correlation spectroscopy; multivariate curve resolution; fourier transform infrared spectrometry; Raman spectrometry
Accelerate oxidative degradation of six vegetable oils was monitored using FTIR and FT-Raman spectroscopy. Two-dimensional correlation spectroscopy and multivariate curve resolution alternating least squares (MCR-ALS) were applied to the analysis of the data. The use of heterospectral two-dimensional correlation of FTIR and FT-Raman data allowed the use of well established band assignments to interpret less clearly assigned spectral features. With a moving window approach it was possible to obtain simplified two-dimensional correlation maps and to detect compounds evolving with different kinetic. Simultaneous analysis of the oxidation experiments of the six different oils monitored by both spectroscopic techniques was performed using MCR-ALS. Although a complete resolution of the data was not possible, the spectral changes occurring during the oxidative degradation of the oils were described with a five-component model. The two fundamentally different chemometric approaches lead to coincident results. (c) 2007 Elsevier B.V. All rights reserved.
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