从葡萄渣中提取的纤维素纳米晶体及其在淀粉基纳米复合材料薄膜开发中的应用。
Cellulose nanocrystals from grape pomace and their use for the development of starch-based nanocomposite films.
机构信息
PPGCAL/Instituto de Química, UFRJ, Cidade Universitária, Ilha do Fundão, 21949-900 Rio de Janeiro, RJ, Brazil.
Departamento de Engenharia Química e de Materiais, Pontifícia Universidade Católica do Rio de Janeiro, PUC-Rio, 38063, 2245-900, Rio de Janeiro, RJ, Brazil.
出版信息
Int J Biol Macromol. 2020 Sep 15;159:1048-1061. doi: 10.1016/j.ijbiomac.2020.05.046. Epub 2020 May 11.
Nanocomposite films prepared from starch (ST) in the presence of cellulose nanocrystals (CNCs) was performed using grape pomace as raw material. CNCs were obtained by acid hydrolysis and added to filmogenic solutions (1, 2, 5, 10 and 15 g/100 g of ST). Cellulose, CNCs and Nanocomposites were characterized. Amorphous non-cellulosic materials were removed from the grape pomace presented values for CrI 64% and 71% and yield 12 and 70% in Cellulose and CNCs, respectively. Nanocomposites showed smaller permeability and the addition of 5 to 15% CNCs formed more opaque films and had improved tensile strength and Young's modulus. The addition of CNCs from 5 to 15% proved to be effective in improving mechanical properties and decreasing water vapor permeability, important characteristics in food packaging materials. This study provided an effective method to obtain CNCs from the agroindustrial waste and open the way to produce high-value starch based nanocomposites.
以葡萄渣为原料，采用淀粉（ST）存在纤维素纳米晶（CNCs）的方法制备了纳米复合膜。CNCs 通过酸水解获得，并添加到成膜溶液中（1、2、5、10 和 15 g/100 g 的 ST）。对纤维素、CNCs 和纳米复合材料进行了表征。从葡萄渣中去除无定形非纤维素材料，其结晶度（CrI）分别为 64%和 71%，产率分别为 12%和 70%。纳米复合材料的渗透性较小，添加 5%至 15%的 CNCs 形成更不透明的薄膜，并提高了拉伸强度和杨氏模量。添加 5%至 15%的 CNCs 被证明可以有效提高机械性能并降低水蒸气渗透性，这是食品包装材料的重要特性。本研究提供了一种从农业工业废物中获得 CNCs 的有效方法，并为生产高价值的淀粉基纳米复合材料开辟了道路。
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