Goffman F D, Böhme T
Institute of Agronomy and Plant Breeding, Georg-August-Universität, Von-Siebold-Strasse 8, D-37075 Göttingen, Germany.
J Agric Food Chem. 2001 Oct;49(10):4990-4. doi: 10.1021/jf010156y.
The balance between the vitamin E (tocochromanols) and polyunsaturated fatty acid (PUFA) contents mainly determines the susceptibility to lipid peroxidation and the storage stability of corn oil. In 1997, field experiments were conducted at two different locations to evaluate a collection of 30 corn hybrids for fatty acid profiles and tocochromanol contents. Hybrids differed significantly (p < 0.01) for major fatty acids, as well as for tocochromanol contents and composition. The major fatty acids were palmitic, oleic, and linoleic acids, whose contents were in the ranges 9.2-12.1%, 19.5-30.5%, and 53.0-65.3%, respectively. The tocopherol contents ranged as follows: alpha-tocopherol, 67-276 mg (kg of oil)(-1); beta-tocopherol, 0-20 mg (kg of oil)(-1); gamma-tocopherol, 583-1048 mg (kg of oil)(-1); delta-tocopherol, 12-71 mg (kg of oil)(-1); total tocopherol, 767-1344 mg (kg of oil)(-1). gamma-Tocopherol was the predominant derivative among all tocopherols. The tocotrienol contents were in the ranges 46-89, 53-164, and 99-230 mg (kg of oil)(-1) for alpha-, gamma-, and total tocotrienol contents, respectively. The tocotrienol profile was not characterized by the predominance of any tocotrienol homologue. alpha-Tocopherol was positively correlated with PUFA (r = 0.41) and with the vitamin E equivalent (vit E equiv) (r = 0.84), and it was not correlated with gamma-tocopherol. gamma-Tocopherol was highly correlated with total tocopherol and tocochromanol contents (r = 0.93 and r = 0.90, respectively), indicating that the contribution of this vitamer to the total tocochromanol content is the most important among all tocochromanols. The high positive correlation found between the vit E/PUFA ratio and the vit E equiv, as well as the absence of correlation between this ratio and PUFA indicates that a higher vit E/PUFA ratio can be easier achieved be increasing the vitamin E content than by modifying fatty acid profile in corn oil.
维生素E（生育三烯酚）与多不饱和脂肪酸（PUFA）含量之间的平衡主要决定了玉米油对脂质过氧化的敏感性以及储存稳定性。1997年，在两个不同地点进行了田间试验，以评估30个玉米杂交种的脂肪酸谱和生育三烯酚含量。杂交种在主要脂肪酸以及生育三烯酚含量和组成方面存在显著差异（p < 0.01）。主要脂肪酸为棕榈酸、油酸和亚油酸，其含量分别在9.2 - 12.1%、19.5 - 30.5%和53.0 - 65.3%范围内。生育酚含量范围如下：α-生育酚，67 - 276毫克/（千克油）；β-生育酚，0 - 20毫克/（千克油）；γ-生育酚，583 - 1048毫克/（千克油）；δ-生育酚，12 - 71毫克/（千克油）；总生育酚，767 - 1344毫克/（千克油）。γ-生育酚是所有生育酚中占主导的衍生物。α-、γ-和总生育三烯酚含量的生育三烯酚含量分别在46 - 89、53 - 164和99 - 230毫克/（千克油）范围内。生育三烯酚谱不以任何生育三烯酚同系物占主导为特征。α-生育酚与PUFA呈正相关（r = 0.41），与维生素E当量（vit E equiv）呈正相关（r = 0.84），且与γ-生育酚不相关。γ-生育酚与总生育酚和生育三烯酚含量高度相关（分别为r = 0.93和r = 0.90），表明在所有生育三烯酚中，这种维生素形式对总生育三烯酚含量的贡献最为重要。在vit E/PUFA比率与vit E equiv之间发现高度正相关，以及该比率与PUFA之间不存在相关性，这表明通过提高玉米油中的维生素E含量比通过改变脂肪酸谱更容易实现更高的vit E/PUFA比率。
