Trifol Jon, Mendoza Ana Isabel, Moriana Rosana
Gaiker Technology Center, Basque Research and Technology Alliance (BRTA), Parque Tecnológico de Bizkaia, Edificio 202, Zamudio 48170, Spain.
Department of Fibre and Polymer Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH-Royal Institute of Technology, Teknikringen 56, Stockholm 100 44, Sweden.
ACS Sustain Chem Eng. 2025 Aug 27;13(35):14446-14458. doi: 10.1021/acssuschemeng.5c04448. eCollection 2025 Sep 8.
This study presents, for the first time, the development of all-rye-based nanocomposite films for biobased food packaging by incorporating cellulose nanocrystals isolated from rye bran (RB-CNC) into a rye arabinoxylan (R-AX) matrix. The isolated RB-CNC exhibited high purity (>90% cellulose) and surface charge (-35.8 mV), together with an exceptional aspect ratio (∼61) and thermal stability (230 °C). Nanocomposite films were developed by incorporating RB-CNC at different loadings (5, 10, and 20 wt %) into commercial R-AX matrix. The resulting composites demonstrated significantly enhanced thermomechanical performance, competitive water vapor permeability, and excellent optical transparency, which are key properties required for packaging applications. Specifically, films with 10 wt % RB-CNC showed an 81% increase in Young's modulus, a 49% enhancement in elongation at break, and a 98% rise in tensile strength compared to neat R-AX films. Optical transparency improved with RB-CNC content, with films achieving 95% transmittance and only 10% haze. All nanocomposites exhibited a thermal stability improvement exceeding 10 °C while retaining R-AX's intrinsic water vapor barrier properties. These findings highlight the potential of RB-CNC as a high-performance, biobased reinforcement for hemicellulose-based biopolymers, paving the way for fully biobased, circular food packaging solutions.
本研究首次展示了用于生物基食品包装的全黑麦基纳米复合薄膜的开发过程，即将从黑麦麸皮中分离出的纤维素纳米晶体（RB-CNC）掺入黑麦阿拉伯木聚糖（R-AX）基质中。分离出的RB-CNC具有高纯度（>90%纤维素）和表面电荷（-35.8 mV），以及出色的长径比（约61）和热稳定性（230°C）。通过将不同含量（5%、10%和20%重量）的RB-CNC掺入商业R-AX基质中，制备了纳米复合薄膜。所得复合材料的热机械性能显著增强，水蒸气透过率具有竞争力，且具有出色的光学透明度，这些都是包装应用所需的关键性能。具体而言，与纯R-AX薄膜相比，含有10%重量RB-CNC的薄膜杨氏模量提高了81%，断裂伸长率提高了49%，拉伸强度提高了98%。光学透明度随RB-CNC含量的增加而提高，薄膜的透光率达到95%，雾度仅为10%。所有纳米复合材料的热稳定性提高超过10°C，同时保留了R-AX固有的水蒸气阻隔性能。这些发现突出了RB-CNC作为基于半纤维素的生物聚合物的高性能生物基增强剂的潜力，为全生物基、循环利用的食品包装解决方案铺平了道路。
