Analysis of Petroleum Ether Extract from Soybean Dreg by FT-IR and GC/MS
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Abstract:
In order to understand the chemical speciation of small molecules in soybean dreg, they were was extracted with petroleum ether using a Soxhlet extractor. The petroleum ether extract was analyzed by Fourier transform infrared (FT-IR) spectroscopy and gas chromatography/mass spectrometry (GC/MS). The raw bean dreg and the residue from the extraction were also analyzed by FT-IR spectroscopy. A pale yellow oil was obtained from the petroleum ether extract after 5-hour continuous extraction, with an extraction yield of 10.7%. FT-IR band shapes were similar for the raw material and the residue from extraction, but with different absorption intensities, while obvious differences in the FT-IR spectra were found between the petroleum ether extract and raw bean dreg/the residue from the extraction. In total, 35 compounds were identified from the petroleum ether extract, which can be classified into seven groups: alkanes, alkenes, arenes, aldehydes, acids, esters, and other species. Among them, the esters were the most abundant compounds, with a relative content of 61.79%. This study was important for the basic theory on developing the value-added utilization of soybean dreg.
