Soybean oil

About: Soybean oil is a research topic. Over the lifetime, 11154 publications have been published within this topic receiving 234952 citations. The topic is also known as: soya oil & soy bean oil.

Incorporation of the toxic aldehyde 4-hydroxy-2-trans-nonenal into food fried in thermally oxidized soybean oil

Abstract: The toxic aldehyde 4-hydroxy-2-trans-nonenal (HNE) is an oxidation product of linoleic acid and is formed during the thermal oxidation of soybean oil at frying temperature. This investigation was conducted to determine whether HNE would be incorporated into food fried in thermally oxidized soybean oil. Commercially available liquid soybean oil was heated at 185°C for 5 h prior to frying uniform pieces of potato (1×0.5×7 cm). The oil was sampled prior to and after frying and was analyzed for the presence of HNE and other polar lipophilic aldehydes and related carbonyl compounds by HPLC. The oil was also extracted from the fried potato pieces and was analyzed identically to the frying oil. HNE was found to be a major polar lipophilic compound in the thermally oxidized frying oil, as previously published by this laboratory, and in the oil extracted from the fried potato. Similar concentrations of HNE were found in the oil prior to and after frying and in the oil extracted from the fried potato (57.53±16.31, 52.40±6.10, and 59.64±11.91 mg HNE per 100 g oil, respectively). These results indicate that toxic HNE was readily incorporated into food fried in thermally oxidized oil; extensive consumption of such fried foods could be a health concern.

Valorization of an agroindustrial soybean residue by supercritical fluid extraction of phytochemical compounds

Abstract: The present study proposes the valorization of an agroindustrial residue (expeller) obtained from soybean oil extraction by pressing operation. Two expeller samples, S1 and S2, were processed to obtain extracts by supercritical fluid extraction (SFE). The extractions were performed at 40 MPa and at 35 or 40 °C, using CO2 as solvent (5 kg CO2/kg expeller). Also, the expellers were impregnated with ethanol (25% w/w expeller), and then new SFE processes at 35 °C were performed for both S1 and S2. The extracts resulting from the ethanol impregnated samples showed the best antioxidant properties with values of total phenolics of 10.6 and 16.0 mg GAE/100 g d.m., flavonoids content of 65.0 and 31.3 QE/100 g d.m. and antioxidant capacity by DPPH values of 9.7 and 12.0 μmol TE/100 g d.m. for S1 and S2, respectively. Phytochemicals from soybean expellers may be recovered through green and safe technologies such as sc-CO2 extraction.