“…Several investigators (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11) have observed that fatdeficient diets can lead to the appearance of polyunsaturated fatty acids of the n-7 series in phospholipids. These acids include 18:2A8,11 (4,5,7,8,11), 18:3A5,8,11 (2,8,11), 20:2A10,13 Ill), 20:3A7,10,13 (1,(4)(5)(6)(7)(8)10,11) and 20:4A4,7,10,13 (3-9,11) acids. Unfortunately, these acids are usually not well resolved from similar fatty acids by gas-liquid chromatography (GLC) on packed columns (6,7,9,12,13}.…”