Key Laboratory of Leather Chemistry and Engineering (Ministry of Education), Sichuan University, Chengdu 610065, PR China.
Key Laboratory of Leather Chemistry and Engineering (Ministry of Education), Sichuan University, Chengdu 610065, PR China; National Engineering Research Center of Clean Technology in Leather Industry, Sichuan University, Chengdu 610065, PR China.
Int J Biol Macromol. 2023 Jun 30;241:124494. doi: 10.1016/j.ijbiomac.2023.124494. Epub 2023 Apr 18.
Collagen, a fibrous protein with triple-helical structure, is a good film-forming substrate for food packaging films because collagen films show advantages of biodegradability, high mechanical strength and good water resistance. However, collagen films lack functional activities, which may limit their applications in the field of active packaging. In this work, phenolic acid-grafted-chitosan was blended with collagen to improve the antioxidant and antimicrobial activities of collagen films. Gallic acid (GA), ferulic acid (FA) and caffeic acid (CA) were respectively grafted onto chitosan, and the physical properties and functional activities of the collagen/phenolic acids-g-chitosan (CGC, CFC and CCC) films were compared. The prepared films presented varying degrees of yellow color, and exhibited significantly improved UV light blocking capacity, antioxidant and antimicrobial properties due to the function of phenolic acid. Moreover, compared with collagen/chitosan (CC) film, CGC, CFC and CCC films showed higher mechanical strength (69.08-73.79 MPa), higher thermal denaturation temperature (69.4-71.2 °C), and lower water vapor permeability values (2.64-2.98 × 10 g m s Pa). The properties of collagen/ phenolic acids-g-chitosan films were greatly affected by the type of phenolic acid grafted. CGC film had the best antioxidant property as well as the best mechanical property, thermostability, UV light and water vapor blocking capacity.
胶原蛋白是一种具有三螺旋结构的纤维状蛋白质，是一种很好的食品包装薄膜成膜基质，因为胶原蛋白薄膜具有可生物降解性、高机械强度和良好的耐水性等优点。然而，胶原蛋白薄膜缺乏功能活性，这可能限制了它们在活性包装领域的应用。在这项工作中，将酚酸接枝壳聚糖与胶原蛋白共混，以提高胶原蛋白薄膜的抗氧化和抗菌活性。分别将没食子酸（GA）、阿魏酸（FA）和咖啡酸（CA）接枝到壳聚糖上，并比较了胶原蛋白/酚酸接枝壳聚糖（CGC、CFC 和 CCC）薄膜的物理性能和功能活性。所制备的薄膜呈现出不同程度的黄色，由于酚酸的作用，显示出显著提高的紫外光阻隔能力、抗氧化和抗菌性能。此外，与胶原蛋白/壳聚糖（CC）薄膜相比，CGC、CFC 和 CCC 薄膜具有更高的机械强度（69.08-73.79 MPa）、更高的热变性温度（69.4-71.2°C）和更低的水蒸气透过率值（2.64-2.98×10 g m s Pa）。胶原蛋白/酚酸接枝壳聚糖薄膜的性能受接枝酚酸的类型影响很大。CGC 薄膜具有最好的抗氧化性能和最好的机械性能、热稳定性、紫外光和水蒸气阻隔性能。
