Instituto de Hortofruticultura Subtropical y Mediterránea "La Mayora", Universidad de Málaga-Consejo Superior de Investigaciones Científicas (IHSM, UMA-CSIC), Departamento de Biología Molecular y Bioquímica, Facultad de Ciencias, E-29071 Málaga, Spain.
Instituto de Hortofruticultura Subtropical y Mediterránea "La Mayora", Universidad de Málaga-Consejo Superior de Investigaciones Científicas (IHSM, UMA-CSIC), Estación Experimental "La Mayora", E-29750 Algarrobo-Costa, Málaga, Spain.
Int J Biol Macromol. 2021 Jun 1;180:709-717. doi: 10.1016/j.ijbiomac.2021.03.126. Epub 2021 Mar 23.
The fabrication of pectin-cellulose nanocrystal (CNC) biocomposites has been systematically investigated by blending both polysaccharides at different relative concentrations. Circular free-standing films with a diameter of 9 cm were prepared by simple solution of these carbohydrates in water followed by drop-casting and solvent evaporation. The addition of pectin allows to finely tune the properties of the biocomposites. Textural characterization by AFM showed fibrous morphology and an increase in fiber diameter with pectin content. XRD analysis demonstrated that pectin incorporation also reduced the degree of crystallinity though no specific interaction between both polysaccharides was detected, by ATR-FTIR spectroscopy. The optical properties of these biocomposites were characterized for the first time and it was found that pectin in the blend reduced the reflectance of visible light and increased UV absorbance. Thermal stability, analyzed by TGA, was improved with the incorporation of pectin. Finally, pectin-cellulose nanocrystal biocomposites showed a good biodegradability in seawater, comparable to other common bioplastics such as cellulose and low-molecular weight polylactide, among others.
通过在不同相对浓度下混合两种多糖，系统地研究了果胶-纤维素纳米晶体（CNC）生物复合材料的制备。通过将这些碳水化合物在水中简单溶解，然后进行滴铸和溶剂蒸发，制备了直径为 9 厘米的圆形自由站立薄膜。添加果胶可以精细调整生物复合材料的性能。通过原子力显微镜（AFM）进行的纹理表征显示出纤维形态，并且随着果胶含量的增加纤维直径增加。XRD 分析表明，尽管通过衰减全反射傅里叶变换红外光谱（ATR-FTIR）未检测到两种多糖之间的特定相互作用，但果胶的掺入也降低了结晶度。这些生物复合材料的光学性能是首次进行的表征，结果表明，混合物中的果胶降低了可见光的反射率并增加了紫外线吸收率。通过 TGA 分析，热稳定性得到了提高，这是由于果胶的掺入。最后，果胶-纤维素纳米晶体生物复合材料在海水中表现出良好的可生物降解性，可与其他常见的生物塑料（如纤维素和低分子量聚乳酸等）相媲美。
