黄色视频不卡_午夜福利免费观看在线_亚洲国产精品999在线_欧美绝顶高潮抽搐喷水_久久精品成人免费网站_晚上一个人看的免费电影_国产又色又爽无遮挡免费看_成人国产av品久久久

Xylan-based preservative films were prepared using xylan, chitosan, citric acid and Sanguisorba officinalis   L. polyphenols (SOPs) as main components. According to the trend of change in the physical properties of the films, the optimal composition was found to be: 1% xylan, 0.9% chitosan, 0.26% citric acid, and 0.15% SOPs. The effects of SOP content on the films were also determined. The results showed that incorporation of SOPs decreased the TS and EAB of the film and improved the water vapor barrier performance of the film. Scanning electron microscopy, contact angle measurements and thermogravimetric analysis showed that incorporation of SOPs enhanced the compactness, hydrophobicity and thermal stability of the films. Moreover, the films exhibited excellent antibacterial activities in the presence of SOPs. Compared to the polyethylene film, the film delayed spoilage bacteria growth during refrigerated storage of pork, effectively prolonging its shelf life to at least 10 days at 4 1C. In summary, xylan-based SOP preservative films meet the requirements for food packaging materials and have good prospects for use in this field.