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Copyright of Journal of Functional Materials / Gongneng Cailiao is the property of Chongqing Functional Materials Periodical Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Surfactant Detergent & Cosmetics is the property of China Surfactant Detergent & Cosmetics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Chitosan (CS) was used as raw material to oxidize its C6 primary hydroxyl group to carboxyl group by laccase/2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) system to obtain oxidized chitosan (C-COS), and then reacted with C-COS and silver nitrate to obtain oxidized chitosan-Ag+ complex (C-COS-Ag). Fourier transform infrared spectroscopy (FT-IR), conductometric titration and X-ray photoelectron spectroscopy (XPS) were used to characterize four different bacteria as antibacterial templates, and UV spectrophotometer was used to optimized C-COS-Ag antibacterial conditions. The morphology of the bacteria before and after the addition of C-COS-Ag was observed by scanning electron microscopy (SEM). The results showed that when CS had a carboxyl group content of 1.42%, Ag+ existed in C-COS-Ag were [Ag(NH3)2]OH and Ag2O (one part was--COOAg and the other part was Ag2O) two forms. The optimal antibacterial condition of C-COS-Ag was 1 h and 26 ℃. The diameter of the inhibition zone was greater than 30 mm, and the minimum inhibitory concentration of Escherichia coli was 7.5 μg/mL. The minimum inhibitory concentration of staphylococcus aureus, salmonella and bacillus subtilis was 10 μg/mL. And the cell wall of the bacteria added with C-COS-Ag was damaged, which seriously affected the growth of bacteria. [ABSTRACT FROM AUTHOR]