de Andrade Marina Reis, Nery Tatiana Barreto Rocha, de Santana E Santana Taynã Isis, Leal Ingrid Lessa, Rodrigues Letícia Alencar Pereira, de Oliveira Reis João Henrique, Druzian Janice Izabel, Machado Bruna Aparecida Souza
Department of Materials, University Center SENAI CIMATEC, National Service of Industrial Learning, Salvador 41650-010, Brazil.
Department of Food and Beverages, National Service of Industrial Learning, Applied Research Laboratory of Biotechnology and Food, University Center SENAI CIMATEC, Salvador 41650-010, Brazil.
Polymers (Basel). 2019 Apr 10;11(4):658. doi: 10.3390/polym11040658.
Interest in nanocellulose obtained from natural resources has grown, mainly due to the characteristics that these materials provide when incorporated in biodegradable films as an alternative for the improvement of the properties of nanocomposites. The main purpose of this work was to investigate the effect of the incorporation of nanocellulose obtained from different fibers (corncob, corn husk, coconut shell, and wheat bran) into the chitosan/glycerol films. The nanocellulose were obtained through acid hydrolysis. The properties of the different nanobiocomposites were comparatively evaluated, including their barrier and mechanical properties. The nanocrystals obtained for coconut shell (CS), corn husk (CH), and corncob (CC) presented a length / diameter ratio of 40.18, 40.86, and 32.19, respectively. Wheat bran (WB) was not considered an interesting source of nanocrystals, which may be justified due to the low percentage of cellulose. Significant differences were observed in the properties of the films studied. The water activity varied from 0.601 (WB Film) to 0.658 (CH Film) and the moisture content from 15.13 (CS Film) to 20.86 (WB Film). The highest values for tensile strength were presented for CC (11.43 MPa) and CS (11.38 MPa) films, and this propriety was significantly increased by nanocellulose addition. The results showed that the source of the nanocrystal determined the properties of the chitosan/glycerol films.
对从自然资源中获取的纳米纤维素的兴趣与日俱增，这主要归因于这些材料在作为改善纳米复合材料性能的替代品掺入可生物降解薄膜时所具备的特性。这项工作的主要目的是研究将从不同纤维（玉米芯、玉米皮、椰壳和麦麸）中获得的纳米纤维素掺入壳聚糖/甘油薄膜的效果。纳米纤维素是通过酸水解获得的。对不同纳米生物复合材料的性能进行了比较评估，包括它们的阻隔性能和机械性能。从椰壳（CS）、玉米皮（CH）和玉米芯（CC）中获得的纳米晶体的长径比分别为40.18、40.86和32.19。麦麸（WB）未被视为纳米晶体的理想来源，这可能是由于纤维素含量较低所致。在所研究的薄膜性能方面观察到了显著差异。水活度从0.601（WB薄膜）到0.658（CH薄膜）不等，水分含量从15.13（CS薄膜）到20.86（WB薄膜）不等。CC薄膜（11.43兆帕）和CS薄膜（11.38兆帕）的拉伸强度最高，并且通过添加纳米纤维素，这一性能显著提高。结果表明，纳米晶体的来源决定了壳聚糖/甘油薄膜的性能。
