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Antimicrobial Activity of Amino-Derivatized Cationic Polysaccharides

  • Sanjay K. S. Patel
  • Jung-Hoe Kim
  • Vipin C. Kalia
  • Jung-Kul Lee
Short Communications

Abstract

To improve the antimicrobial property of chitosan, water-soluble chitosan modified in their quaternary ammonium groups were synthesized. The antimicrobial properties were evaluated against Escherichia coli, Bacillus subtilis, Saccharomyces cerevisiae and Candida tropicalis. The activities increased with increasing cationic charges and the length of the alkyl chain as follows amino-chitosan, dimethylaminoethyl-chitosan, dimethylpropyl amino-chitosan, dimethylamino-1-propyl-chitosan, diethylaminoethyl (DEAE)-chitosan, and quaternized DEAE-chitosan. The modified cationic chitosans showed high antimicrobial property against B. subtilis—Gram-positive bacteria, but were less active towards yeast (C. tropicalis and S. cerevisiae) and E. coli—Gram-negative bacteria. The simple structure of the Gram-positive bacteria may explain why the cationic chitosan derivatives are more active towards B. subtilis than yeast and E. coli. The target sites of the chitosan derivatives are assumed to be the cytoplasmic membranes of microorganisms. The antimicrobial activities were strongly dependent on the cationic charge and the molecular weight. It can be suggested that these cationic chitosan derivatives have potential as antimicrobial agents.

Keywords

Antimicrobial activity Bacillus subtilis Cationic chitosan derivatives Gram-negative bacteria Gram-positive bacteria 

Notes

Acknowledgements

This research was supported by basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2018H1D3A2001746, 2013M3A6A8073184). This work was supported by the Energy Efficiency and Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry and Energy, Republic of Korea (20153030091450). This research was supported by the KU Research Professor program of Konkuk University.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicting interests associated with this publication.

Supplementary material

12088_2018_764_MOESM1_ESM.doc (182 kb)
Supplementary material 1 (DOC 182 kb)

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Copyright information

© Association of Microbiologists of India 2018

Authors and Affiliations

  1. 1.Department of Chemical EngineeringKonkuk UniversitySeoulRepublic of Korea
  2. 2.Department of Biological SciencesKorea Advanced Institute of Science and TechnologyDaejeonRepublic of Korea

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