Abstract
This study uses acetic acid as the solvent to make two different deacetylated chitosans into chitosan solutions (CS1 and CS2). A specified amount of chitosan solutions are evaporated at 55 °C for 30, 60, and 90 minutes, immersed in NaOH-NaHCO3(aq), and then freeze-dried to form six membrane types, CS1-30, CS1-60, CS1-90 ,CS2-30, CS2-60 and CS2-90. Scanning electron microscopic (SEM) observation, a swelling ratio test, and an antibacterial assay are performed to evaluate the influence of differing evaporation times on the CS membranes. The test results show that membrane CS1 types have good properties. In particular, CS1-60 possesses an optimal swelling property and a maximum inhibition zone.
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