大豆油脱臭留出物中の抗酸化性物質に関する研究

抄録

It is advisable to use natural antioxidative substances instead of synthetic antioxidants for foodstuff. In the previous reports the authors dealt that the unsaponifiable matter obtained from the deodorizer sludge of soybean oil had an inhibiting effect against the autoxidation of partially hydrogenated or thermally polymerized whale oils. There are several reports which dealt the presence of antioxidative substances except tocopherols in the sludge unsaponifiable. Some of these substances are assumed to have the structures similar to those of tocopherols. However, their structures and properties have not yet been fully studied because of the difficulty of their isolation.
In this paper, the concentration of these antioxidative substances from the unsaponifiable matter of the deodorizer sludge of soybean oil through silicagel column was investigated. Three antioxidative substances, one of them was new, were isolated from the concentrates by preparative thin layer chromatography. From the results of UV, IR, Mass and NMR spectra of these substances, it was found that these three antioxidative compounds were tocopherol dimers. The A.O.M. stabilities of partially hydrogenated whale oils containing the mixture of these tocopherol dimers or tocopherols were also determined. As a result it was observed that the mixture of tocopherol dimers had a strong inhibiting effect against the autoxidation of partially hydrogenated whale oil, although the potency was rather lower than that of the mixture of tocopherols.