Food Safety Research Institute, Kunming University of Science and Technology, Kunming 650500, China; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education of China, Qilu University of Technology, Jinan 250353, China.
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China.
Carbohydr Polym. 2015 Jun 25;124:35-42. doi: 10.1016/j.carbpol.2015.01.071. Epub 2015 Feb 12.
To confer cellulose fibers antimicrobial and antioxidant activities, chitosan (CS)/lignosulfonates (LS) multilayers were constructed on fibers surfaces through layer-by-layer deposition technique. The formation of CS/LS multilayers on cellulose fibers surfaces was verified by X-ray photoelectron spectroscopy (XPS) and zeta potential measurement. The surface morphologies of CS/LS multilayers on fibers surfaces were observed by atomic force microscopy (AFM). The results showed that characteristic element (i.e. N and S element) content increased with increasing bilayers number, the surface LS content increased linearly as a function of bilayers. Zeta potential of modified fibers was inversed after deposition of each layer. AFM phase images indicated that the cellulose microfibrils on fibers surfaces were gradually covered by granular LS aggregate. The antimicrobial testing results demonstrated that CS/LS multilayers modified fibers with CS in the outermost layer exhibited higher antimicrobial activity against Escherichia coli. The antioxidant testing results showed that antioxidant activity of CS/LS multilayers modified fibers was better than that of original fibers under the same oxidation conditions.
为了赋予纤维素纤维抗菌和抗氧化性能，通过层层自组装技术在纤维表面构建壳聚糖（CS）/木质素磺酸盐（LS）多层膜。X 射线光电子能谱（XPS）和zeta 电位测量验证了 CS/LS 多层膜在纤维素纤维表面的形成。原子力显微镜（AFM）观察了纤维表面 CS/LS 多层膜的表面形貌。结果表明，特征元素（即 N 和 S 元素）含量随层数的增加而增加，表面 LS 含量随层数呈线性增加。各层沉积后，改性纤维的 zeta 电位发生反转。AFM 相图表明，纤维表面的纤维素微纤维逐渐被颗粒状 LS 聚集物覆盖。抗菌测试结果表明，CS 位于最外层的 CS/LS 多层膜修饰纤维对大肠杆菌表现出更高的抗菌活性。抗氧化测试结果表明，在相同氧化条件下，CS/LS 多层膜修饰纤维的抗氧化活性优于原纤维。
