Abstract
An active film from silver carp skin gelatin incorporated with green tea extract (GTE) was developed. The effects of GTE concentrations including 0.3 and 0.7% (w/v) on the film properties were determined by measuring total polyphenolic content, antioxidant activity and physical properties. The findings of this study showed that the incorporation of GTE into gelatin films enhanced the total phenolic content, DPPH radical scavenging activity and reducing power. However, DPPH radical scavenging activity and reducing power decreased during storage. As regards the physical properties, higher GTE content incorporated into gelatin films revealed significantly higher tensile strength and lower elongation at break, water solubility and water vapor permeability, but no difference in thickness. Gelatin–GTE films exhibited lower light transmission in UV light, lower percent transmittance and higher transparency value compared to control film. Moreover, protein patterns of gelatin–GTE films had no changes. The thermal stability of gelatin–GTE films was improved and grew with the increasing concentration of GTE. FTIR spectra indicated that protein–polyphenol interactions were involved in the gelatin–GTE films. Smooth and homogeneous surface and compact-structure were observed in gelatin–GTE films. Thus, the addition of GTE into gelatin film improved the antioxidant activity and directly affected the properties most likely due to the interactions between gelatin and GTE.
Published Version
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