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In this study, in-vitro antibacterial activity of four different concentrations (0.00%, 0.05%, 0.10%, and 0.15% w/v%) of chitosan, a natural biopolymer, was tested against the foodborne pathogen Staphylococcus aureus ATCC 25923 using well diffusion and colony counting methods. The organism showed the highest sensitivity to 1.50% chitosan, while the antibacterial effect was raised with increasing concentration of chitosan in the medium. Microbiological testing of randomly selected village chicken egg samples obtained from a market in Kiribathgoda, Sri Lanka revealed high cell counts of S. aureus greater than 5 log CFU/ mL, which exceeded the maximum accepted limit (3 log CFU/ g) that should be present in poultry based raw products according to SLS 1161:2003 guidelines, indicating a potential risk for presence of preformed Staphylococcal enterotoxins in these eggs. Therefore, a sample containing randomly selected, 90, six-pooled eggs from the same source was used to investigate the in-vivo antibacterial efficacy of 1.50% chitosan (coated on the surface of eggshells) against this pathogen. Both chitosan coated eggs and chitosan non-coated eggs (except raw eggs) were externally inoculated from ~ 5 log CFU/ mL of the bacterial inoculum and monitored for 28 days, where it showed a bacteriostatic activity with 4 log CFU/ mL and 3 log CFU/ mL fold growth reductions compared to chitosan non-coated eggs and raw eggs respectively. These experimental results suggest that chitosan coating is a promising method to protect the microbial quality and safety of domestic chicken eggs regarding S. aureus contaminations

Chitosan Improves the Shelf Life of Domestic Chicken (Gallus gallus) Eggs against Staphylococcus aureus Contaminations