1. Department for Safety and Quality of Cereals, Working Group for Lipid Research Max Rubner‐Institut, Federal Research Institute for Nutrition and Food Schützenberg 12 D‐32756 Detmold Germany
2. Faculty of Sciences Laboratoire de Chimie des Plantes et de synthèse Organique et Bioorganique University Mohammed V Rabat Morocco B.P:8007.N.U