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Title: Antibacterial activity of shrimp chitosan against Escherichia coli
Authors: Tsai Guo-Jane;Su Wen-Huey
Contributors: 國立臺灣海洋大學:食品科學系
Keywords: Antibacterial mechanism;shrimp chitosan;E. coli
Date: 1999-03
Issue Date: 2012-04-26T06:07:50Z
Publisher: Journal of Food protection
Abstract: Abstract:The effects of cell age, reaction temperature, pH value and salts on the inhibitory activity of shrimp chitosan (98% deacetylation) in E. coli were investigated The age of a bacterial cell affected its susceptibility to chitosan, with cells in the late exponential phase being most sensitive to chitosan. Higher temperature (25oC and 37oC) and acidic pH increased the bactericidal effects of chitosan. The fact that sodium ions (100 mM Na+) reversed the bactericidal effect of chitosan at E. coli densities of 103-105 cfu/ml, but did not change chitosan activity at the lower cell density (102 cfu/ml), demonstrated that Na+ might complex with chitosan and accordingly reduced chitosan’s activity. Divalent cations at concentrations of 10 mM and 25 mM reduced the antibacterial activity of chitosan, in the order of Ba2+> Ca2+> Mg2+. Chitosan also causes leakage of glucose and lactate dehydrogenase from E. coli cells. These data support the hypothesis that the antibacterial mechanism of chitosan involves a crosslinkage between the polycations of chitosan and the anions on the bacterial surface, and that this crosslinkage changes the membrane permeability.
Relation: 62(3), pp.239-243
URI: http://ntour.ntou.edu.tw/handle/987654321/31003
Appears in Collections:[食品科學系] 期刊論文

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