Universidad de Santiago de Chile (USACH), Facultad de Química y Biología, Departamento de Ciencias del Ambiente, Grupo de Polímeros, Chile.
Universidad de Santiago de Chile (USACH), Facultad de Química y Biología, Departamento de Ciencias del Ambiente, Grupo de Polímeros, Chile; Departamento de Ingeniería Química, Biotecnología y Materiales, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Avenida Beaucheff 851, Santiago, Chile.
Food Chem. 2021 Oct 30;360:129966. doi: 10.1016/j.foodchem.2021.129966. Epub 2021 May 4.
Spectroscopies analysis indicated that kefiran contains branched hexasaccharide repeating units. Neat kefiran films, 2 and 5% w/w of glycerol, d-glucitol, d-galactitol, d-mannitol, and d-limonene were incorporated as plasticizers. Neat and plasticized kefiran films were characterized by physical, thermal, mechanical, optical, and water solubilization properties. Neat kefiran had a glass transition temperature (T) of -20 ± 2 °C and, with the addition of plasticizers between -15 to -17 ± 2 °C. The values were close to the neat kefiran, and the results could be attributed to a lower amount of plasticizer used. The solubility of the glycerol plasticized films increases by 33% and decreased with the concentration of other plasticizers in comparison with the neat kefiran. d-glucitol and d-galactitol decreased the microhardness and Young's Modulus of films around 30% and 74% respectively, obtaining more flexible kefiran films. Kefiran based films could find applications as potential materials in the food-packaging industry.
光谱分析表明，青稞壳聚糖含有支链六糖重复单元。纯青稞壳聚糖膜、2%和 5%（w/w）的甘油、赤藓糖醇、半乳糖醇、甘露醇和柠檬烯被用作增塑剂。纯青稞壳聚糖膜和增塑青稞壳聚糖膜的物理、热学、机械、光学和水溶胀性能都得到了表征。纯青稞壳聚糖的玻璃化转变温度（T）为-20±2°C，加入增塑剂后为-15 至-17±2°C。这些值与纯青稞壳聚糖相近，这可能是由于使用的增塑剂较少。与纯青稞壳聚糖相比，甘油增塑膜的溶解度增加了 33%，而其他增塑剂的浓度则降低了。赤藓糖醇和半乳糖醇分别使薄膜的显微硬度和杨氏模量降低了约 30%和 74%，从而获得了更柔韧的青稞壳聚糖薄膜。基于青稞壳聚糖的薄膜可以作为有潜力的食品包装材料。
