1. Quality Department of Agricultural Products, Walloon Agricultural Research Centre (CRA-W), Chaussée de Namur 24, 5030 Gembloux, Belgium; Faculté des Sciences Agronomiques, Unité de Biochimie de la Nutrition (BNUT), Catholic University of Louvain (UCL), Place Croix du Sud 3/bte 8, 1348 Louvain-la-Neuve, Belgium; and Instituto de la Grasa (CSIC), Padre García Tejero 4, 41012 Sevilla, Spain