Oxidation of Corn Oils with Spiked Tocols
Oxidation of Corn Oils with Spiked Tocols
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DOI：
10.1007/s11746-011-1853-5
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发表时间：
2011-11-01
影响因子：
2
通讯作者：
Wang, Tong
中科院分区：
文献类型：
--
作者：
Dolde, David;Wang, Tong
使用添加有浓度在100和5，000 ppm之间的生育酚和生育三烯酚的剥离玉米油来评价这些母育酚化合物的抗氧化活性。脂质氢过氧化物的形成，测量为过氧化值（PV），在60摄氏度下在黑暗中加速5天。还使用氧化稳定性仪器（OSI）在100 A摄氏度下测量作为诱导期（IP）的抗氧化性。对于PV抑制，含有α-生育酚的油随着浓度的增加而表现出降低的有效性。在第5天，含有100 ppm α-生育酚的样品具有约40 mequiv/kg的最低PV，含有5，000 ppm的样品具有最高值，范围为150至200 mequiv/kg。在浓度高于700 ppm的α-托莫西汀，有一个反的抗氧化特性的α-托莫西汀促进脂质氧化。用δ-生育酚和γ-生育三烯酚（T3）观察到相反的浓度效应，其中抗氧化剂有效性随浓度增加。对于所有母育酚同系物，在100 A ℃下的OSI-IP小时随着母育酚浓度的增加而增加，尽管在大于700 ppm时有效性降低。α-托吡酯在延长IP（在5，000 ppm下类似于9小时）方面不如δ-托吡酯和γ-T3（在5，000 ppm下13-14小时）有效。因此，不同托莫西汀的抗氧化或促氧化活性不同，结果也不同，这取决于所使用的评价方法。
Stripped corn oils with added tocopherols and tocotrienols, at concentrations between 100 and 5,000 ppm, were used to evaluate antioxidant activity of these tocol compounds. The formation of lipid hydroperoxides, measured as peroxide value (PV), was accelerated at 60 A degrees C in the dark for 5 days. Resistance to oxidation as induction period (IP) was also measured using an oxidative stability instrument (OSI) at 100 A degrees C. For PV inhibition, the oils containing alpha-tocols exhibited decreasing effectiveness with increasing concentration. At day five, samples with 100 ppm alpha-tocols had the lowest PVs of about 40 mequiv/kg and samples containing 5,000 ppm had the highest values, ranging from 150 to 200 mequiv/kg. At concentrations above 700 ppm of alpha-tocols, there was an inversion of antioxidative properties as alpha-tocols promoted lipid oxidation. The opposite concentration effect was observed with delta-tocols and gamma-tocotrienol (T3) for which antioxidant effectiveness increased with concentration. OSI-IP hour at 100 A degrees C increased with increasing tocol concentrations for all tocol homologs, although with diminishing effectiveness at greater than 700 ppm. The alpha-tocols were less effective in extending the IP (similar to 9 h at 5,000 ppm) than the delta-tocols and gamma-T3 (13-14 h at 5,000 ppm). Therefore, the antioxidant or prooxidant activities of different tocols are different and the outcomes are different depending on the evaluation methods used.