Ballinas-Casarrubias Lourdes, Villanueva-Solís Luis, Espinoza-Hicks Carlos, Camacho-Dávila Alejandro, Castillo Hilda Amelia Piñón, Pérez Samuel B, Villa Eduardo Duarte, Hernández Miguel De Dios, González-Sánchez Guillermo
Facultad de Ciencias Químicas, Universidad Autónoma de Chihuahua, Circuito Universitario s/n, Campus Universitario No. 2, C.P. Chihuahua 31125, Chih., Mexico.
Centro de Investigación en Materiales Avanzados, Laboratorio Nacional de Nanotecnología, Miguel de Cervantes No. 120, Chihuahua 31109, Chih., Mexico.
Polymers (Basel). 2017 Nov 2;9(11):570. doi: 10.3390/polym9110570.
High-resistance paper was manufactured by laccase-grafting of carboxymethyl cellulose (CMC) and chitosan (CPX) on Kraft pulp fiber. The reaction was mediated in the presence of laccase by one of the following polyphenols in the presence of air: gallic acid (GA), vanillic acid (VA) and catechol (1,2⁻DHB). Enzyme was added at constant loading (24 kg ton), 1% pulp consistency, 0.005% CMC, pH = 6.3 ± 0.5 and 2 mM of mediator. CPX content was assessed at two levels (0% and 0.005%). Treated pulps were analyzed by different mechanical tests (ring crush, mullen, corrugating medium test (CMT) flat crush of corrugating medium test and tension). An improvement in these parameters was obtained by biopolymer coupling and selected mediator. When using GA, three parameters increased more than 40%, while ring crush increased 120%. For the case of VA, properties were enhanced from 74% to 88% when CPX was added. For 1,2⁻DHB, there was not found a statistically significant difference between the results in the presence of CPX. Scanning electron microscopy, confocal microscopy, FTIR and C NMR were used in all papers in order to evaluate grafting. Hence, it was possible to correlate polymerization with an improvement of paper's mechanical properties.
高抗张强度纸是通过在牛皮纸浆纤维上用漆酶接枝羧甲基纤维素（CMC）和壳聚糖（CPX）制成的。该反应在漆酶存在下，于空气中由以下多酚之一介导：没食子酸（GA）、香草酸（VA）和儿茶酚（1,2-二羟基苯）。酶以恒定负载量（24千克/吨）、1%的纸浆浓度、0.005%的CMC、pH = 6.3±0.5和2毫摩尔的介质添加。CPX含量在两个水平（0%和0.005%）下进行评估。对处理后的纸浆进行了不同的力学测试（环压、耐破度、瓦楞芯纸测试（CMT）、瓦楞芯纸平压测试和拉伸）。通过生物聚合物偶联和选定的介质，这些参数得到了改善。使用GA时，三个参数提高了40%以上，而环压提高了120%。对于VA的情况，添加CPX时性能提高了74%至88%。对于1,2-二羟基苯，在添加CPX的情况下，结果之间未发现统计学上的显著差异。所有论文都使用扫描电子显微镜、共聚焦显微镜、傅里叶变换红外光谱和碳核磁共振来评估接枝情况。因此，有可能将聚合作用与纸张力学性能的改善联系起来。
