The worldwide outbreak of SARS-CoV-2 has attracted extensive attention to antibacterial and antivirus materials. Cellulose is the most potential candidate for the preparation of green, environmentally friendly antibacterial and antiviral materials.Chitosan oligosaccharide (COS) shows fascinating antibacterial and antiviral properties,furthermore, COS has the advantages of relatively lower molecular weight and stronger water solubility.For introducing chitosan oligosaccharide onto cellulose fiber, the impregnation method was applied in the presence of citric acid as a crosslinking agent and sodium hypophosphite as a catalyst. By successful crosslinking of the chitosan oligosaccharide onto the cellulosic fibers, the modified fibers exhibit against both Staphylococcus aureus and Escherichia coli. Besides, it shows the highly effective antiviral property against the bacteriophage MS2. More importantly, the modified fibers have excellent antibacterial and antiviral durability; 20 washing cycles have almost no effects on the above performances. The paper sheets prepared from the modified fibers also show great antibacterial and antiviral properties, exhibiting great potential application in protective hygiene products, especially spunlaced non-woven fabric production.
Fig. 1. Scheme of the preparation of chitosan oligosaccharide modified cellulosic fiber.
Fig. 2. SEM images of the surface of fibers (a, c) and modified fibers (b, d).
Remark:Chitosan oligosaccharide (COS) used in the experiment were provided by our company-Qingdao BZ Oligo Biotech Co.,Ltd.
Reference:Antibacterial and antiviral chitosan oligosaccharide modified cellulosic fibers with durability against washing and long-acting activity