Antioxidant activities of distiller dried grains with solubles as protein films containing tea extracts and their application in the packaging of pork meat

•DDGS protein (DP) can be utilized as a biodegradable film material.•DP films containing tea extracts were prepared as anti-oxidative films.•Anti-oxidative DP films were applied to pork meat packaging.•DP film containing green tea extract had the greatest antioxidant property.

Distiller dried grains with solubles (DDGS) as protein (DP) films were prepared. Additionally, to prepare anti-oxidant films, green tea extract (GTE), oolong tea extract (OTE), and black tea extract (BTE) were incorporated into the DP films. Consequently, the incorporation of the tea extracts did not alter the physical properties of the films much, whereas the antioxidant activities, such as ABTS and DPPH radical scavenging activities were observed. To apply the DP films containing tea extracts to food packaging, pork meat was wrapped with the films and stored at 4 °C for 10 d. During storage, the pork meat wrapped with the DP films containing GTE, OTE, and BTE had less lipid oxidation than did the control. Among the tea extracts, the DP film containing GTE had the greatest antioxidant activity. These results indicate that the DP films containing green tea extracts can be utilized as an anti-oxidative packaging material for pork meat.