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Antibacterial activity of chitosans with different degrees of deacetylation and viscosities
- Jung, Eun Ju, Youn, Dal Kyoung, Lee, Shin Ho, No, Hong Kyoon, Ha, Jong Gill, Prinyawiwatkul, Witoon
- International journal of food science & technology 2010 v.45 no.4 pp. 676-682
- Bacillus cereus, Bacillus subtilis, Escherichia coli, Gram-positive bacteria, Lactobacillus curvatus, Listeria monocytogenes, Pectobacterium carotovorum, Proteus vulgaris, Pseudomonas fluorescens, Salmonella Typhimurium, Serratia marcescens, Staphylococcus aureus, Vibrio parahaemolyticus, antibacterial properties, chitosan, microbial growth, minimum inhibitory concentration, viscosity
- Antibacterial activities of six acid-soluble [two degrees of deacetylation (DD) x three viscosities] and two water-soluble chitosans (two DD with similar viscosities) were examined against eight gram-negative (Pseudomonas fluorescens, Proteus vulgaris, Erwinia carotovora, Serratia marcescens, Escherichia coli, Vibrio parahaemolyticus, V. vulnificus, and Salmonella Typhimurium) and six gram-positive bacteria (Listeria monocytogenes, Staphylococcus aureus, Bacillus subtilis, B. cereus, Lactobacillus curvatus, and L. plantarum). Antibacterial activities of chitosans differed depending on the chitosan types and bacteria tested. Water-soluble chitosans inhibited bacterial growth by one to eight log cycles at 0.1% concentration; however, the effects were much lesser than those observed with 0.05% acid-soluble chitosans. Minimum inhibitory concentration (MIC) values (0.03% to above 0.1%) of acid-soluble chitosans were much lower than those (0.05% to above 0.8%) of water-soluble chitosans. Based on MIC values, the acid-soluble chitosan with 99% DD and lower viscosity (17.9 mPa s) was most effective in inhibiting bacteria growth among eight chitosans tested.