Functional, antioxidant and film-forming properties of tuna-skin gelatin with a brown algae extract.
Characteristics and functional properties of gelatin from skin of Atlantic Bluefin tuna (Thunnus thynnus) were investigated. The gelatin was extracted by an acid-swelling process in the presence of different concentrations of commercial pepsin, followed by subsequent heating. The extraction yield was higher when increasing concentrations of pepsin were used during the swelling process. Emulsion activity index, foam formation ability and foam stability of gelatin increased with the increase of gelatin concentration. Antioxidant properties (ferric-reducing ability and DPPH-radical-scavenging capacity) of gelatin-based edible films containing aqueous or methanolic extracts of brown algae (Cystoseira barbata) were also assessed. For comparative purposes, tuna-skin gelatin edible film with BHA was studied. Antioxidant properties of the films were increased significantly when natural extracts were added. Extracts of brown algae could be useful additives to obtain edible films from tuna-skin gelatin with interesting functional and antioxidant properties.
Laboratoire de Génie Enzymatique et de Microbiologie-Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax, B.P "1173", 3038 Sfax, Tunisia.
Anissa
A
Haddar
Sabrine
S
Sellimi
Raouia
R
Ghannouchi
Oscar Martinez
OM
Alvarez
Moncef
M
Nasri
Ali
A
Bougatef
D000818:Animals; D002417:Cattle; D045703:Emulsifying Agents / Q000737:chemistry / Q000378:metabolism; D005419:Flavonoids / Q000032:analysis; D016166:Free Radical Scavengers / Q000737:chemistry / Q000378:metabolism*; D005780:Gelatin / Q000737:chemistry / Q000378:metabolism*; D010434:Pepsin A / Q000378:metabolism; D000459:Phaeophyceae / Q000737:chemistry*; D010636:Phenols / Q000032:analysis; D012867:Skin / Q000737:chemistry*; D014413:Tuna
D045703:Emulsifying Agents; D005419:Flavonoids; D016166:Free Radical Scavengers; D010636:Phenols; D005780:Gelatin; D010434:Pepsin A