Linoelaidic acid is the all-trans fatty acid homolog of linoleic acid. Trans-fatty acids are generally not detected in raw food oils, but constitute up to 25% of the unsaturated fat in partially hydrogenated oils.[1]
Reference:
[1]. Ratnayake, W.M.N., Chen, Z.Y., Pelletier, G., et al. Occurrence of 5c,8c,11c,15t-eicosatetraenoic acid and other unusual polyunsaturated fatty acids in rats fed partially hydrogenated canola oil. Lipids 29, 707-714 (1994).