School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China.
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China.
Int J Biol Macromol. 2022 Sep 30;217:624-632. doi: 10.1016/j.ijbiomac.2022.07.049. Epub 2022 Jul 11.
Conventional fossil fuel-based packaging materials often brings of food safety and serious environmental pollution. It is significant to develop an environmentally-friendly packaging material. In this work, a levan-chitosan (LE/CS) blend film was fabricated via the solution casting method. The films were evaluated by Fourier transform infrared spectroscopy and X-ray diffraction, indicating the formation of hydrogen bonds between chitosan and levan. The mechanical properties of LE/CS films demonstrated a mechanical strength higher than CS films, and the best tensile strength appeared at a ratio of LE/CS (1:1) up to 18.78 ± 0.73 MPa. The addition of levan caused a significant increase in absorption of UV light with a reduction in swelling water of the blend films from 29.13 ± 0.53 % of chitosan film to 2.07 ± 0.27 % of LE/CS (1:1) film. A higher contact angle and lower WVP were observed for LE/CS blend films. LE/CS blend films were then used as packaging material for fresh pork and were well maintained the qualities. The study suggested that the new blend film might have a good prospect as a food packaging material.
传统的基于化石燃料的包装材料常常会带来食品安全问题和严重的环境污染。因此，开发一种环保的包装材料具有重要意义。在本工作中，通过溶液浇铸法制备了一种低聚果糖-壳聚糖（LE/CS）共混膜。傅里叶变换红外光谱和 X 射线衍射表明壳聚糖和低聚果糖之间形成了氢键。LE/CS 薄膜的力学性能表现出比 CS 薄膜更高的机械强度，在 LE/CS（1:1）的比例下，拉伸强度达到最佳，为 18.78 ± 0.73 MPa。低聚果糖的加入导致共混膜对紫外光的吸收显著增加，同时降低了溶胀水的含量，从 CS 薄膜的 29.13 ± 0.53%降低到 LE/CS（1:1）薄膜的 2.07 ± 0.27%。LE/CS 共混膜的接触角较高，水蒸气透过率较低。然后，将 LE/CS 共混膜用作新鲜猪肉的包装材料，能够很好地保持其品质。研究表明，这种新型共混膜可能作为一种有前景的食品包装材料。
