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Antibacterial activity of neat chitosan powder and flakes

Nury Ardila, France Daigle, Marie-Claude Heuzey and Abdellah Ajji

Article (2017)

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Cite this document: Ardila, N., Daigle, F., Heuzey, M.-C. & Ajji, A. (2017). Antibacterial activity of neat chitosan powder and flakes. Molecules, 22(1), p. 1-19. doi:10.3390/molecules22010100
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Abstract

This study investigates the antibacterial activity of neat chitosan powder and flakes against three different bacterial species, Escherichia coli, Listeria innocua and Staphylococcus aureus, which are frequent causes of food spoilage. The effect of chitosan concentration and purity, as well as the influence of temperature, ionic strength (salt) and impact of a solid physical support in the medium are examined. Results show that the antibacterial activity of neat chitosan: (i) requires partial solubilisation; (ii) can be promoted by environmental factors such as adequate temperature range, ionic strength and the presence of a solid physical support that may facilitate the attachment of bacteria; (iii) depends on bacterial species, with a sensitivity order of E. coli &gt; L. innocua &gt; S. aureus; and (iv) increases with chitosan concentration, up to a critical point above which this effect decreases. The latter may be due to remaining proteins in chitosan acting as nutrients for bacteria therefore limiting its antibacterial activity. These results on the direct use of chitosan powder and flakes as potential antimicrobial agents for food protection at pH values lower than the chitosan pK(a) (6.2-6.7) are promising.

Uncontrolled Keywords

E. coli; L. innocua; S. aureus; antibacterial activity; chitosan; Anti-Bacterial Agents; Bacterial Adhesion; Chitosan; Colony Count, Microbial; Escherichia coli; Hydrogen-Ion Concentration; Listeria; Microbial Viability; Osmolar Concentration; Particle Size; Powders; Staphylococcus aureus; Temperature; Anti-Bacterial Agents; Powders; Chitosan

Open Access document in PolyPublie
Subjects: 1800 Génie chimique > 1800 Génie chimique
1800 Génie chimique > 1808 Rhéologie et transformation
3750 Chimie des polymères > 3754 Biopolymères
Department: Département de génie chimique
Research Center: CREPEC - Centre de recherche sur les systèmes polymères et composites à haute performance
Funders: Fonds de recherche du Québec--Nature et technologies (FRQNT)
Date Deposited: 14 Dec 2018 16:05
Last Modified: 15 Dec 2018 01:20
PolyPublie URL: https://publications.polymtl.ca/3535/
Document issued by the official publisher
Journal Title: Molecules (vol. 22, no. 1)
Publisher: MDPI
Official URL: https://doi.org/10.3390/molecules22010100

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