title: Use of Gallic Acid to Enhance the Antioxidant and Mechanical Properties of Active Fish Gelatin Film.
abstract: This study explores the potential roles of gallic acid in fish gelatin film for improving mechanical properties, UV barrier, and providing antioxidant activities. Glycerol, a common used plasticizer, also impacts on mechanical properties of the film. A factorial design was used to investigate the effects of gallic acid and glycerol concentrations on antioxidant activities and mechanical properties of fish gelatin film. Increasing the amount of gallic acid increased the antioxidant capacities of the film measured by radical scavenging assay and the ferric reducing ability of plasma assay. The released antioxidant power of gallic acid from the film was not reduced by glycerol. The presence of gallic acid not only increased the antioxidant capacity of the film, but also increased the tensile strength, elongation at break, and reduced UV absorption due to interaction between gallic acid and protein by hydrogen bonding. Glycerol did not affect the antioxidant capacities of the film, but increased the elasticity of the films. Overall, this study revealed that gallic acid entrapped in the fish gelatin film provided antioxidant activities and improved film characteristics, namely UV barrier, strength, and elasticity of the film.
authors.affiliation: Dept. of Food Science and Technology, Faculty of Agro-Industry, Kasetsart Univ, Bangkok, 10900, Thailand.
authors.forename: Kanokrat
authors.initials: K
authors.lastname: Limpisophon
authors.affiliation: Dept. of Food Sciences and Technology, Inst. of Food Science, Univ. of Natural Resources and Life Sciences (BOKU), Vienna, Muthgasse 18, A-1190, Vienna, Austria.
authors.forename: Gerhard
authors.initials: G
authors.lastname: Schleining
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000737:chemistry; D052160:Benzothiazoles / Q000737:chemistry; D004548:Elasticity; D005396:Fish Products; D005609:Free Radicals / Q000737:chemistry; D005707:Gallic Acid / Q000737:chemistry*; D005780:Gelatin / Q000737:chemistry*; D005990:Glycerol / Q000737:chemistry; D006860:Hydrogen Bonding; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D010473:Perciformes; D010539:Permeability; D010968:Plasticizers / Q000737:chemistry; D013314:Stress, Mechanical; D013451:Sulfonic Acids / Q000737:chemistry; D013718:Tensile Strength; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry
chemical_list: D000975:Antioxidants; D052160:Benzothiazoles; D005609:Free Radicals; D010968:Plasticizers; D013451:Sulfonic Acids; C015233:gelatin film; D014867:Water; C002502:2,2'-azino-di-(3-ethylbenzothiazoline)-6-sulfonic acid; D005707:Gallic Acid; D005780:Gelatin; D005990:Glycerol
keywords: active packaging; antioxidant; gallic acid; gelatin; protein