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KMID : 0525720130180020069
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Journal of Chitin and Chitosan
2013 Volume.18 No. 2 p.69 ~ p.74
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Storage Time and Temperature Affect Antimicrobial Activity of Chitosan Solutions against Listeria monocytogenes and Escherichia coli O157:H7
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Torrico Damir Dennis
Janes Marlene E.
No Hong-Kyoon
Sriwattana Sujinda
Prinyawiwatkul Witoon
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Abstract
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Antimicrobial activities of chitosan solutions (pH 5.6) with different molecular weights (470 and 1,100 kDa) and concentrations (0.5 and 1.0% in 1.0% acetic acid) against Listeria monocytogenes and Escherichia coli O157:H7 were evaluated during 4 weeks of storage at -20, 4 and 25 o C. Antimicrobial activities of chitosan solutions decreased with increasing storage periods. Higher antimicrobial activity was observed at lower storage temperatures. 470 kDa chitosan showed stronger antimicrobial activity against L. monocytogenes, while 1,100 kDa chitosan was slightly more effective against E. coli. For both bacteria, 1.0% chitosan was more effective than 0.5%. Only 1,100 kDa chitosan (1.0%) showed significant decreases in viscosity over time. At 25 o C, a significant correlation (r=0.97; P<0.05) between antimicrobial activity (log CFU/mL reduction) against L. monocytogenes and viscosity of 1,100 kDa chitosan solution at 1.0% was observed. Antimicrobial activity of chitosan was dependent on molecular weight, concentration, storage temperature and time.
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KEYWORD
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Antimicrobial activity, Chitosanl, E. coli O157:H7, L. monocytogenes, Storage
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