The antimicrobial activities of chito-oligosaccharides against four Gram-positive and seven Gramnegative
bacteria were compared to chitosan and chitin with an emphasis on the effects of biopolymer
molecular weight (Mv) and degree of deacetylation (DD). Chitin was isolated from shrimp (Parapenaeus
longirostris) shell waste by sequential chemical treatments. Chitosan and its oligomers N-acetyl chitooligosaccharides
and chito-oligosaccharides were prepared by deacetylation and chemical hydrolysis,
respectively. Chitin exhibited a bacteriostatic effect on Gram-negative bacteria, Escherichia coli ATCC
25922, Vibrio cholerae, Shigella dysenteriae, and Bacteroides fragilis. Chitosan exhibited a bacteriostatic
effect on all bacteria tested, except Salmonella typhimurium. The oligomers exhibited a bactericidal effect
on all bacteria tested.
The antimicrobial activities of chito-oligosaccharides against four Gram-positive and seven Gramnegativebacteria were compared to chitosan and chitin with an emphasis on the effects of biopolymermolecular weight (Mv) and degree of deacetylation (DD). Chitin was isolated from shrimp (Parapenaeuslongirostris) shell waste by sequential chemical treatments. Chitosan and its oligomers N-acetyl chitooligosaccharidesand chito-oligosaccharides were prepared by deacetylation and chemical hydrolysis,respectively. Chitin exhibited a bacteriostatic effect on Gram-negative bacteria, Escherichia coli ATCC25922, Vibrio cholerae, Shigella dysenteriae, and Bacteroides fragilis. Chitosan exhibited a bacteriostaticeffect on all bacteria tested, except Salmonella typhimurium. The oligomers exhibited a bactericidal effecton all bacteria tested.
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