研究目的
To evaluate the applicability of UV–Vis absorption and fluorescence spectroscopy for monitoring the oxidation level of oil extracted from white sesame seeds (Sesamum indicum L.) and its respective biodiesel degraded at 110 °C for various times, and to propose a quantitative model to predict the acid value of oil and biodiesel using the UV–Vis absorption data.
研究成果
The study demonstrated that UV–Vis absorption and fluorescence spectroscopy could be used to monitor the oxidative degradation of vegetable oil and biodiesel. A prediction model for acid value using UV–Vis absorption data was proposed, showing average errors of 3% and 8% for oil and biodiesel, respectively. This approach offers a rapid and practical method for assessing the quality of vegetable oil and biodiesel.
研究不足
The study's limitations include the need for sample dilution to avoid saturation of UV–Vis absorption and inner-filter effects during fluorescence measurements, and the relatively small number of samples used for the prediction model.
1：Experimental Design and Method Selection:
The study involved the use of UV–Vis absorption and fluorescence spectroscopy to monitor the oxidation level of oil and biodiesel.
2：Sample Selection and Data Sources:
Oil was extracted from white sesame seeds (Sesamum indicum L.) and biodiesel was produced via transesterification. Samples were degraded at 110 °C for various times.
3：List of Experimental Equipment and Materials:
A bench spectrometer (Cary 50 Varian?) for UV–Vis absorption spectra, a portable fluorometer (MM Optics) for fluorescence spectra, and a Rancimat? method (model 893, Metrohm?) for oxidative stability evaluation.
4：Experimental Procedures and Operational Workflow:
Samples were heated at 110 °C for different times, and their acid value, UV–Vis absorption, and fluorescence were measured.
5：Data Analysis Methods:
MATLAB 2012 routines were used for analyzing absorption and fluorescence spectra, and a prediction model for acid value was built using the leave-one-out cross validation method.
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