CICECO - Aveiro Institute of Materials, Chemistry Department, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal; QOPNA, Chemistry Department, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal.
QOPNA, Chemistry Department, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal.
Carbohydr Polym. 2017 Nov 1;175:303-310. doi: 10.1016/j.carbpol.2017.07.081. Epub 2017 Jul 31.
In this work bleached E. globulus kraft pulp was doped with polyhexamethylene biguanide (PHMB) from an aqueous solution or from a suspension of silica capsules (PHMB@silica) by impregnation under atmospheric or ultra-high pressure (UHP) conditions (500MPa). The antimicrobial properties of pulps were evaluated towards gram-negative E. coli and gram-positive L. innocua bacteria. PHMB loads below 500mg per kg of pulp revealed negligible bacteriostatic properties, whereas PHMB loads of ca 3000-4000mg per kg demonstrated bactericidal properties of pulp without significant deterioration of its mechanical strength. The UHP impregnation allowed significant improvement of PHMB uptake. Thus, under equal conditions, PHMB uptake was ca 25% greater under UHP than under atmospheric pressure impregnation, whereas the leachable amounts of PHMB in both pulps were comparable. The sorption of PHMB@silica on pulp in suspension under UHP conditions was ca 17% greater than under atmospheric pressure with almost 70% increase of leachable PHMB.
在这项工作中，用过氧化氢漂白的桉树硫酸盐浆分别从水溶液或二氧化硅胶囊（PHMB@silica）悬浮液中在大气或超高压（UHP）条件下（500MPa）浸渍负载聚六亚甲基双胍（PHMB）。通过评估纸浆对革兰氏阴性大肠杆菌和革兰氏阳性无害李斯特菌的抗菌性能来研究纸浆的抗菌性能。纸浆中 PHMB 的负载量低于 500mg/kg 时，抑菌性能可以忽略不计，而 PHMB 的负载量约为 3000-4000mg/kg 时，纸浆具有杀菌性能，而其机械强度没有明显下降。超高压浸渍可显著提高 PHMB 的负载量。因此，在相同条件下，超高压浸渍时 PHMB 的负载量比大气压力浸渍时高约 25%，而两种纸浆中 PHMB 的浸出量相当。在 UHP 条件下，悬浮液中 PHMB@silica 对纸浆的吸附量比大气压下高约 17%，而可浸出 PHMB 的含量则增加了近 70%。
