“…4,5 Because of the excellent hydrophilicity, biocompatibility and biodegradability, the hydrogels constructed by cellulose 6 , alginate 7 , collagen 8 , dextran 9 , silk 10 and hyaluronan 11 are regularly considered as candidates for artificial tissue, scaffolds and extracellular matrix. But the poor bacterial barrier capacity restricts the direct applications except for embedding with antibiotics, metal ions or nanoparticles [12][13][14][15] , which also brings in possible inflammation and allergy in vivo 16,17 . Natural polymer extracted from marine crustaceans and fungi, so-called chitin and its derivatives, chitosan, which has also been proved to accelerate fibroblast proliferation, are regarded as more promising matrix as wound repairing materials 18,19 .…”