Key Laboratory of Food Nutrition and Safety, Ministry of Education, College of Food Engineering and Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China.
State Key Laboratory of Food Nutrition and Safety, Tianjin 300457, China; Key Laboratory of Food Nutrition and Safety, Ministry of Education, College of Food Engineering and Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China.
Carbohydr Polym. 2020 Jan 1;227:115264. doi: 10.1016/j.carbpol.2019.115264. Epub 2019 Sep 16.
Based on the electrostatic interaction mechanism, cellulose nanofiber (CNF) was utilized as reinforcing additives to fabricate polysaccharide films (alginate (Alg) or chitosan (CH)) by two methods: blending and layer-by-layer (LbL). Results showed that the addition of CNF led to higher tensile strength for all films than those without CNF addition, except for the blending CH film due to CNF agglomeration. The highest TS reached 140 MPa for the blending Alg film at 7 wt% CNF. Moreover, all CNF-reinforced films generally had lower water vapor permeability. The addition of CNF aggravated the opacity of all films, especially for the blending ones. Microstructure indicated that CNF were well dispersed in Alg-based films while aggregates were evident in the blending CH films. Interactions between CNF and Alg (or CH) and their relations on film performance were supported by FTIR and DSC of the resultant films, zeta-potential and turbidity of the film-forming solutions.
基于静电相互作用机制，利用纤维素纳米纤维（CNF）作为增强添加剂，通过两种方法制备多糖膜（海藻酸钠（Alg）或壳聚糖（CH））：共混和层层（LbL）。结果表明，与未添加 CNF 的膜相比，除了由于 CNF 团聚而导致共混 CH 膜的拉伸强度降低外，所有添加 CNF 的膜的拉伸强度都有所提高。在 7wt% CNF 的共混 Alg 膜中，达到了 140MPa 的最高拉伸强度。此外，所有 CNF 增强的膜通常具有较低的水蒸气透过率。CNF 的添加增加了所有膜的不透明度，特别是共混膜。微观结构表明 CNF 在 Alg 基膜中分散良好，而在共混 CH 膜中则存在明显的团聚。通过对所得膜的傅里叶变换红外光谱（FTIR）和差示扫描量热法（DSC）、膜形成溶液的Zeta 电位和浊度，证实了 CNF 与 Alg（或 CH）之间的相互作用及其对膜性能的关系。
