Martínez-Force Enrique, Ruiz-López Noemi, Garcés Rafael
Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Avenida Padre García Tejero 4, E-41012 Seville, Spain.
J Agric Food Chem. 2009 Feb 25;57(4):1595-9. doi: 10.1021/jf803227n.
The 1,3-random-2-random theory was proposed several years ago to explain the fatty acid distribution in vegetable oil triacylglycerols. However, by demonstrating an asymmetry between positions sn-1 and sn-3 in olive oil, cocoa butter, sunflower oil, etc., a number of studies have shown that this theory does not hold true for some oils and fatty acids. Accordingly, the distribution of fatty acids in sunflower triacylglycerols has been studied, calculating the alpha coefficient of asymmetry in several combinations of standard linoleic, high-oleic, and high-stearic sunflower oils. The results obtained from the oils of these lines and from single seed oil samples indicate that the asymmetry for saturated fatty acids is greater in high-oleic than in standard linoleic backgrounds. Hence, the distribution of the fatty acids within the triacylglycerol molecule appears to depend not only on the fatty acid under study but also on the other fatty acids in the oil. Thus, it is demonstrated for the first time that certain fatty acids can influence the distribution of other fatty acids within triacylglycerols.
1,3-随机-2-随机理论是数年前提出的，用于解释植物油三酰甘油中的脂肪酸分布情况。然而，通过证明橄榄油、可可脂、向日葵油等中sn-1和sn-3位之间的不对称性，多项研究表明该理论对某些油类和脂肪酸并不成立。因此，对向日葵三酰甘油中的脂肪酸分布进行了研究，计算了标准亚油酸型、高油酸型和高硬脂酸型向日葵油几种组合中的不对称α系数。从这些品系的油以及单粒种子油样品中获得的结果表明，高油酸背景下饱和脂肪酸的不对称性大于标准亚油酸背景。因此，三酰甘油分子内脂肪酸的分布似乎不仅取决于所研究的脂肪酸，还取决于油中的其他脂肪酸。因此，首次证明了某些脂肪酸可影响三酰甘油中其他脂肪酸的分布。
