Thipchai Parichat, Punyodom Winita, Jantanasakulwong Kittisak, Thanakkasaranee Sarinthip, Hinmo Sasina, Pratinthong Kanticha, Kasi Gopinath, Rachtanapun Pornchai
Doctor of Philosophy Program in Nanoscience and Nanotechnology (International Program/Interdisciplinary), Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.
Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.
Polymers (Basel). 2023 Jun 8;15(12):2622. doi: 10.3390/polym15122622.
Cellulose from different species of bamboo ( Gamble, Munro (DSM), , and sp.) was converted to cellulose nanocrystals (CNCs) by a chemical-mechanical method. First, bamboo fibers were pre-treated (removal of lignin and hemicellulose) to obtain cellulose. Next, the cellulose was hydrolyzed with sulfuric acid using ultrasonication to obtain CNCs. The diameters of CNCs are in the range of 11-375 nm. The CNCs from DSM showed the highest yield and crystallinity, which was chosen in the film fabrication. The plasticized cassava starch-based films with various amounts (0-0.6 g) of CNCs (from DSM) were prepared and characterized. As the number of CNCs in cassava starch-based films increased, water solubility and the water vapor permeability of CNCs decreased. In addition, the atomic force microscope of the nanocomposite films showed that CNC particles were dispersed uniformly on the surface of cassava starch-based film at 0.2 and 0.4 g content. However, the number of CNCs at 0.6 g resulted in more CNC agglomeration in cassava starch-based films. The 0.4 g CNC in cassava starch-based film was found to have the highest tensile strength (4.2 MPa). Cassava starch-incorporated CNCs from bamboo film can be applied as a biodegradable packaging material.
采用化学机械法将来自不同竹种（甘博竹、门罗竹（帝斯曼）以及未提及具体名称的竹种）的纤维素转化为纤维素纳米晶体（CNCs）。首先，对竹纤维进行预处理（去除木质素和半纤维素）以获得纤维素。接着，使用超声波辅助，用硫酸对纤维素进行水解以获得CNCs。CNCs的直径范围为11 - 375纳米。帝斯曼的CNCs产率和结晶度最高，在薄膜制备中选用了它。制备并表征了含有不同量（0 - 0.6克）帝斯曼CNCs的增塑木薯淀粉基薄膜。随着木薯淀粉基薄膜中CNCs数量的增加，其水溶性和水蒸气透过率降低。此外，纳米复合薄膜的原子力显微镜显示，当含量为0.2克和0.4克时，CNC颗粒均匀分散在木薯淀粉基薄膜表面。然而，0.6克CNCs的数量导致木薯淀粉基薄膜中出现更多的CNC团聚现象。发现木薯淀粉基薄膜中0.4克CNC具有最高拉伸强度（4.2兆帕）。含竹膜CNCs的木薯淀粉可作为可生物降解包装材料应用。
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