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As the jojoba oil was used in cosmetic, pharmaceutical, dietetic food, animal feeding, lubrication, polishing and bio-diesel fields, it was important to study its aging at high temperature by oxidative process. In this work a FT-MIR methodology was developed for monitoring accelerate oxidative degradation of jojoba oils. Principal component analysis (PCA) was used to differentiate various samples...
This study was conducted to classify petroleum oils in terms of their biodegradation stage by using spectroscopic analysis associated to chemometric treatments. Principal Component Analysis (PCA) has been applied on infrared and UV fluorescence spectra of Brazilian and Pyrenean oils. For Brazil samples, the method allowed to distinguish the biodegraded oils from the non-affected ones. Pyrenean sampling...
Previous works evidenced that industrial dust samples analyzed are often aggregates of submicronic, heterogeneous particles. As a consequence, even when analyzed by Raman microspectrometry, mixtures of different compounds are observed. Such an observation motivated the use of a self-modeling mixture analysis to determine pure species present. That is the reason why the simple-to-use interactive self-modeling...
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