牛蒡提取物对鸡皮明胶膜结构和性能的影响

为研究牛蒡提取物对鸡皮明胶膜结构和性能的影响。本文以鸡皮明胶膜为基质,牛蒡提取液为改性材料,分别制备牛蒡提取液浓度为0%、1%、3%、5%、7%的牛蒡提取物/鸡皮明胶复合膜,并测定各组复合膜物理性能,并作结构表征。结果表明:随着牛蒡提取液浓度增加,复合膜的水蒸气透过率先降低后增加,在3%最低,下降率达11.27%;水溶性逐渐降低,在5%时趋于平稳,为72.29%;抗拉强度先增加后减少,在5%时最大,为22.44%;断裂伸长率和透光率逐渐下降;雾度逐渐增加,浓度为5%达到38.97%;抗氧化性和抑菌性逐渐增加,在浓度为5%时达到15.02%,11.01%,其中对大肠杆菌的抑菌性明显优于金黄色葡萄糖球菌;羟基自由基清除率逐渐增加,当浓度在5%时,达到59.98%。结构表征分析得出牛蒡提取液与鸡皮明胶膜发生化学反应形成了新的化学键,电镜下可观测到晶体。综合各项性能选取牛蒡提取液浓度为5%时作为复合膜制备的最佳配比。

Effects of Arctium lappa Extract on Structure and Properties of Chicken Skin Gelatin Film

In this work, the effect of Arctium lappa extract on the structure and properties of chicken skin gelatin film was investigated. The chicken skin gelatin film and the Arctium lappa extract were used as the substrate and the modified material, respectively. The concentration of Arctium lappa extract in the composite film were 0%, 1%, 3%, 5% and 7%, respectively. The physical properties of the composite film were characterized by structural characterization. The results showed that with the increase of the concentration of Arctium lappa extract, the water vapor transmission rate of the composite film decreased firstly and then increased. When the concentration of Arctium lappa extract was 3%, the water vapor transmission rate decreased by 11.27%. The water solubility gradually decreased, and stabilized at 5% Arctium lappa extract (the value of water solubility was 72.29% at 5%). The tensile strength increased firstly and then decreased. The maxium was 22.44% when the concentration of Arctium lappa extract was 5%. The elongation at break and the light transmittance gradually decreased. The haze gradually increased, and the maxium (38.97%) was found at the concentration 5%. Antioxidant and bacteriostatic activities increased gradually, which value were 15.02% and 11.01% at a concentration of 5%, respectively. The antibacterial activity against Escherichia coli was significantly better than that of G. aureus. The hydroxyl radical scavenging rate gradually increased. When the concentration was 5%, it reached 59.98%. Structural characterization analysis showed that a new chemical bond was formed between the Arctium lappa extract and the chicken skin gelatin film. Crystals were also observed. The optimum concentration of Arctium lappa extract was 5%.