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Characterisation of composite films fabricated from collagen/chitosan and collagen/soy protein isolate for food packaging applications

机译：胶原蛋白/壳聚糖和胶原/大豆蛋白分离物制造的复合膜的表征用于食品包装应用

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This study was undertaken to evaluate the potential of collagen/chitosan (CG/CH) and collagen/soy protein isolate (CG/SPI) composite films for food packaging applications. Two types of composite films at different blend ratios of CG/CH or CG/SPI (10?:?0, 8?:?2, 6?:?4, 5?:?5 and 0?:?10%, w/w) using 30% (w/w) glycerol as plasticiser were prepared and characterised. The results of mechanical tests of the CG/CH composite films displayed higher elongation at break point (EAB), but lower tensile strength (TS) and modulus of elasticity ( E ), compared to the CG film ( P < 0.05). Conversely, the CG/SPI composite films exhibited lower EAB, but greater TS and E values ( P < 0.05) compared to the CG film. Water vapour permeability (WVP) increased markedly in the CG/CH composite films; whilst it was found to decrease in CG/SPI composite films at the different blend ratios tested ( P < 0.05). Transparency values and water solubility of CG/CH and CG/SPI composite films were decreased substantially, compared to the CG film ( P < 0.05). Lower light transmission was observed in all composite films in ultraviolet (UV) and visible regions (200–800 nm), indicating improved UV blocking capacity. Intermolecular interactions through hydrogen bonding among polymeric components were dominant in the CG/SPI (8?:?2) composite film as elucidated by FTIR analysis. Thermo-gravimetric curves demonstrated that CG/CH (8?:?2) and CG/SPI (8?:?2) composite films exhibited lower heat susceptibility and weight loss (%), as compared to the CG film in the temperature range of 30–600 °C. DSC thermograms suggested that the compatible blend of CG/SPI (8?:?2) rendered a solid film matrix, which consisted of highly ordered and aggregated junction zones. SEM micrographs revealed that both CG/CH (8?:?2) and CG/SPI (8?:?2) composite films were slightly rougher than the CG film, but no apparent signs of cracking and layering phenomena were observed, thereby highlighting their potential use as biodegradable packaging materials.
机译：本研究进行了评估胶原/壳聚糖（CG / CH）和胶原/大豆蛋白分离物（CG / SPI）复合膜的潜力用于食品包装应用。 CG / CH或CG / SPI的不同共混比（10？：？0,8？：？2,6？：？4,5？：？5和0？：？10％，W / w）使用30％（w / w）甘油作为增塑剂制备并表征。与CG薄膜相比，CG / CH复合膜的机械试验结果显示在断点（EAB）处的伸长率（EAB），但较低的拉伸强度（TS）和弹性模量（E）（P <0.05）。相反，与CG膜相比，CG / SPI复合膜表现出较低的EAB，但更高的TS和E值（P <0.05）。 CG / CH复合膜中的水蒸气渗透率（WVP）显着增加;虽然发现在测试的不同共混物比下降低Cg / SPI复合膜（P <0.05）。与CG膜相比，CG / CH和CG / SPI复合膜的透明度值和水溶性基本上降低（P <0.05）。在紫外（UV）和可见区（200-800nm）的所有复合膜中观察到较低的光传输，表明改善的UV阻挡能力。通过FTIR分析阐明的Cg / SPI（8→：α2）复合膜中的聚合物组分中的氢键合的分子间相互作用。热重量曲线证明CG / CH（8？：2）和CG / SPI（8？：2）复合膜表现出较低的热敏和体重减轻（％），与温度范围内的CG膜相比30-600°C。 DSC热分析图表明CG / SPI（8？：2）的兼容混合物使实体膜基质呈现，由高度有序和聚集的接线区组成。 SEM显微照片显示CG / CH（8？：2）和CG / SPI（8？2）复合薄膜比CG薄膜略微粗糙，但没有观察到裂缝和分层现象的明显迹象，从而突出显示他们的潜在用作可生物降解包装材料。

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