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Inhibitory effect of glycerin on Vibrio parahaemolyticus and Salmonella
Abstract:
In a study of the effect of glycerin in transport media on Vibrio parahaemolyticus and Salmonella, it was found that a concentration of 30% glycerin was highly inhibitory for V. parahaemolyticus and to a lesser degree for Salmonella. The incorporation of peptone or human feces in media did not reduce the inhibitory effect of glycerin. In media with 15% glycerin, viable counts of V. parahaemolyticus and Salmonella increased after 24 hr of incubation both in the presence and absence of feces. Due to the concurrent increase in the total bacterial count in the media containing feces, no enrichment effect was noted.
Insights
High glycerin concentrations inhibit Vibrio parahaemolyticus and Salmonella growth in transport media. Lower concentrations with feces did not show enrichment, indicating glycerin
Area of Science:
- Microbiology
- Food Safety
- Bacterial Pathogenesis
Background:
- Vibrio parahaemolyticus and Salmonella are significant foodborne pathogens.
- Effective transport media are crucial for accurate bacterial detection and public health surveillance.
- Glycerin is a common component in transport media, but its effect on bacterial viability requires further investigation.
Purpose of the Study:
- To evaluate the inhibitory effects of glycerin on Vibrio parahaemolyticus and Salmonella.
- To determine if peptone or human feces can mitigate glycerin's inhibitory action.
- To assess the potential for bacterial enrichment in glycerin-containing media.
Main Methods:
- Bacterial cultures of V. parahaemolyticus and Salmonella were incubated in transport media with varying glycerin concentrations (30% and 15%).
- The influence of peptone and human feces on bacterial survival and growth was assessed.
- Viable bacterial counts and total bacterial counts were determined after 24 hours of incubation.
Main Results:
- A 30% glycerin concentration demonstrated significant inhibition of V. parahaemolyticus and moderate inhibition of Salmonella.
- Peptone or human feces did not counteract the inhibitory effect of glycerin.
- At 15% glycerin, viable counts of both bacteria increased after 24 hours, but no enrichment was observed due to a concurrent rise in total bacterial counts, especially in the presence of feces.
Conclusions:
- Glycerin concentration is a critical factor influencing the viability of V. parahaemolyticus and Salmonella in transport media.
- High glycerin levels (30%) are inhibitory, while lower levels (15%) may not prevent growth but do not lead to enrichment.
- The findings have implications for optimizing transport media composition for accurate pathogen detection and surveillance.