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Inhibition of Salmonella Typhimurium by tannins in vitro

Costabile, A., Sanghi, S., Martin-Palaez, S., Mueller-Harvey, I., Gibson, G. R., Rastall, R. A. and Klinder, A. (2011) Inhibition of Salmonella Typhimurium by tannins in vitro. Journal of Food, Agriculture & Environment, 9 (1). pp. 119-124. ISSN 1459-0263

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Given the recent EU ban of antibiotics to promote the growth of farm animals, alternative approaches are needed for animal production systems. Tannins, which are already commercially marketed for animal nutrition, have bacteriostatic and bactericidal properties against pathogenic bacteria. The aim of this study was to investigate the inhibitory effect of various tannins against Salmonella Typhimurium (SL1344nal(r)) to identify potentially effective feed additives. Different sources of condensed and hydrolysable tannins were tested at concentrations between I and 6 mg ml(-1). The tannins tested were either commercial preparations or isolated from such preparations or from plants using Sephadex LH-20 based column chromatography. Some, but not all, of the tannins significantly decreased bacterial growth compared to tannin-free selenite cystine broth following incubation for 24 h at 37 degrees C. Gallotannins were especially effective and tara achieved 1.28 log(10) reductions after 24 hours. Antibacterial activity was also confirmed with inhibition zone diameters in a disc diffusion test. The experiments demonstrated that tannins may have potential as feed additives for reducing Salmonella infections in farm animals.

Item Type:Article
Divisions:Life Sciences > School of Agriculture, Policy and Development > Department of Animal Sciences > Animal, Dairy and Food Chain Sciences (ADFCS)- DO NOT USE
Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences > Food Microbial Sciences Research Group
Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences > Food Research Group
ID Code:20752
Uncontrolled Keywords:Polyphenols, Salmonella, antimicrobial activity, hydrolysable, condensed tannins
Publisher:WFL Publisher

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