[Preparation and Characterization of Chitosan-Poloxamer-based Antibacterial Hydrogel Containing Silver Nanoparticles]

In order to solve the problem of high cytotoxicity in vitro of nano-silver antibacterial gel,and the problem of large nano-silver particle size and size distribution,this study prepared nano-silver antibacterial gel with better biocompatibility and good antibacterial effect by using physical cross-linking method and using poloxamer as dispersant when prepared nano-silver.In this study,nano-silver was prepared by photo-initiator method and by adding poloxamer as a dispersant,and then UV-visible absorption spectrum test and scanning electron microscopy(SEM)test were carried out using prepared nano-silver mixture and particles after drying respectively.The gel was prepared through adjusting its pH value by using sodium bicarbonate,and then pH value test,SEM test for cross-section of gel,swelling ratio test,viscosity test,inhibition zone test and in vitro cytotoxicity test were carried out.The test results showed that the maximum absorption wavelength of prepared nano-silver,using poloxamer as dispersant and ultra-pure water as solvent,was 414 nm,and the average nano-silver size was about 60 nm.The prepared nano-silver using poloxamer as dispersant had smaller particle diameter and narrower particle size distribution than those using PVP as dispersant.Similarly,the prepared nano-silver using ultra-pure water as solvent also had smaller particle diameter and narrower particle size distribution than those using distilled water as solvent.The pH value of the prepared gel was between 5.8~6.1.The dried gel section had many holes.The water absorption of gel was fine and the viscosity of gel was fit to coat on the gauze.In addition,the prepared gel with nano-silver had greater ability to inhibit Escherichia coli and Staphyloccocus aureus at the concentrations of 24,18 and 12μg/mL.And the biocompatibility of the prepared gel with nano-silver was good when the concentration below 24μg/mL.Based on the above features,the nano-silver antibacterial gel could be used in the treatment of burn or other wounds.