title: Antimicrobial and antioxidant surface modification of cellulose fibers using layer-by-layer deposition of chitosan and lignosulfonates.
abstract: 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.
authors.affiliation: 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. Electronic address: lihuiscut@126.com.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.affiliation: 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.
authors.forename: Lincai
authors.initials: L
authors.lastname: Peng
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry*; D000975:Antioxidants / Q000737:chemistry*; D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry*; D008031:Lignin / Q000031:analogs & derivatives* / Q000737:chemistry; D018625:Microscopy, Atomic Force; D056951:Photoelectron Spectroscopy; D013499:Surface Properties
chemical_list: D000890:Anti-Infective Agents; D000975:Antioxidants; C001545:lignosulfuric acid; D002482:Cellulose; D008031:Lignin; D048271:Chitosan
keywords: Antimicrobial activity; Antioxidant activity; Cellulose fibers; Chitosan; Layer-by-layer; Lignosulfonates