title: The fusion of lipid droplets is involved in fat loss during cooking of duck "foie gras".
abstract: Fat loss during cooking of duck "foie gras" is the main quality issue in processing plants. To better understand this phenomenon, a histological and ultrastructural study was conducted. The aim was to characterize changes in lipid droplets of duck "foie gras" related to fat loss during cooking. Ten fatty livers were sampled before and after cooking and prepared for optical and transmission electron microscopy. In raw livers, the lipid droplets were nearly spherical while after cooking, they were larger and lost their spherical shape. We also observed a decrease in the number of droplets after cooking, probably due to droplet fusion caused by the heat treatment. Before cooking, there were fewer lipid droplets and a higher osmium tetroxyde staining intensity in the fatty liver, which later gave a lower technological yield. Fat loss during cooking was higher when there was more fusion of lipid droplets before cooking.
authors.affiliation: INRA, UMR 1289 Tissus Animaux Nutrition Digestion Ecosystème Métabolisme, F-31326 Castanet-Tolosan, France. laetitia.theron@ensat.fr
authors.forename: L
authors.initials: L
authors.lastname: Théron
authors.forename: T
authors.initials: T
authors.lastname: Astruc
authors.forename: M
authors.initials: M
authors.lastname: Bouillier-Oudot
authors.forename: C
authors.initials: C
authors.lastname: Molette
authors.forename: A
authors.initials: A
authors.lastname: Vénien
authors.forename: F
authors.initials: F
authors.lastname: Peyrin
authors.forename: Z G
authors.initials: ZG
authors.lastname: Vitezica
authors.forename: X
authors.initials: X
authors.lastname: Fernandez
mesh_terms: D000818:Animals; D003296:Cooking; D004372:Ducks; D005223:Fats / Q000032:analysis / Q000737:chemistry*; D006358:Hot Temperature; D008099:Liver / Q000737:chemistry; D008460:Meat; D046529:Microscopy, Electron, Transmission; D008856:Microscopy, Fluorescence; D009993:Osmium Tetroxide; D013194:Staining and Labeling
chemical_list: D005223:Fats; D009993:Osmium Tetroxide