Antimicrobial activities of high molecular weight water‐soluble chitosans against selected gram‐negative and gram‐positive foodborne pathogens |
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Authors: | Nancy Katherine Rubio Rita Quintero Jose Fuentes Jose Brandao Marlene Janes Witoon Prinyawiwatkul |
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Affiliation: | School of Nutrition and Food Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA, USA |
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Abstract: | Antimicrobial activities of high molecular weight water‐soluble chitosans (HMWWS) against selected Gram‐negative and Gram‐positive foodborne pathogens (initial inoculation of ca. 6.5 Log CFU mL?1) were evaluated. Chitosans with 789 kDa and/or 1017 kDa were dissolved in aspartic acid (AS) to obtain 1–4% w/v solutions. Among HMWWS, only 4% 789 kDa AS chitosan reduced E. coli counts by 2 Log CFU mL?1 from 7.33 at 0 h to 5.16 Log CFU mL?1 at 96 h, and they were not effective against S. Typhimurium. Depending on the concentrations, HMWWS completely inhibited V. cholerae, V. vulnificus and V. parahaemolyticus as well as B. cereus and L. monocytogenes after 48 h or 96 h of incubation. Compared with the control (no HMWWS), 2% or 3% 1017 kDa AS chitosans showed about 3 Log CFU mL?1 lower (4.72–4.86 vs. 7.71) for S. aureus at 96 h of incubation. |
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Keywords: | Antimicrobial properties chitosan foodborne pathogens high molecular weight chitosan water‐soluble chitosan |
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