Preparation of novel antimicrobial-modified starch and its adsorption on cellulose fibers: Part I. Optimization of synthetic conditions and antimicrobial activities |
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| Authors: | Y. Guan L. Qian H. Xiao A. Zheng |
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| Affiliation: | (1) Department of Chemical Engineering, University of New Brunswick, Fredericton, NB, Canada, E3B 5A3;(2) State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China;(3) School of Materials Science and Engineering, Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, Shanghai, 200237, China |
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| Abstract: | Antimicrobial-modified starch was synthesized by covalently bonding guanidine polymer (PHGH) with potato starch via coupling reaction. Orthogonal tests were applied to optimize the reaction conditions. The coupling efficiency could reach 90.21% at the optimal conditions: temperature, 70 °C; time, 2 h; PHGH/starch, 120 wt.%; GDE/starch, 8 wt.%; pH, 11. PHGH modified starches exhibited high antimicrobial activities against both E. coli and S. aureus. Shaking flask method was more suitable for current non-released modified starches than diffusion method to evaluate the antimicrobial activities. In the presence of 1.0 wt.% PHGH in wood fibers, the growth inhibition reached almost 100%. The AFM results also demonstrated that the antimicrobial mechanism of PHGH was to destroy the membrane of the cells. |
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| Keywords: | Starch Guanidine polymer Antimicrobial activity Orthogonal test AFM |
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