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Antibacterial activity of chitosans with different degrees of deacetylation and viscosities
Author(s) -
Jung Eun Ju,
Youn Dal Kyoung,
Lee Shin Ho,
No Hong Kyoon,
Ha Jong Gill,
Prinyawiwatkul Witoon
Publication year - 2010
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/j.1365-2621.2010.02186.x
Subject(s) - bacillus cereus , serratia marcescens , chemistry , proteus vulgaris , chitosan , bacteria , vibrio parahaemolyticus , pseudomonas fluorescens , listeria monocytogenes , microbiology and biotechnology , antibacterial activity , escherichia coli , biology , biochemistry , genetics , gene
Summary Antibacterial activities of six acid‐soluble [two degrees of deacetylation (DD) × 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.