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Antimicrobial in vitro activities of condensed tannin extracts on avian pathogenic Escherichia coli

Dakheel, M. M., Alkandari, F. A. H., Mueller-Harvey, I., Woodward, M. J. and Rymer, C. (2020) Antimicrobial in vitro activities of condensed tannin extracts on avian pathogenic Escherichia coli. Letters in Applied Microbiology, 70 (3). pp. 165-172. ISSN 1472-765X

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To link to this item DOI: 10.1111/lam.13253


Condensed tannins (CTs), which extracted from yew leaves, tilia flower and black locust leaves, were examined for their antimicrobial in vitro activity against avian pathogenic Escherichia coli (APEC). Past research demonstrated that CTs which contain procyanidins and prodelphinidins that could inhibit the growth of a wide range of bacteria. However, there is no information on how these affect pathogenic bacteria from chickens such as APEC. The high concentration of extracts, 10, 5, 2.5 mg/ml, affected the growth curves of APEC, which gave different inhibition values for the three CT extracts. Further, these CTs had significant effects (P≤0.05) on APEC biofilm and motility depending on each CT concentration and composition. However, at low concentration (0.6 mg/ml), the tilia flowers, a high molar percentage of procyanidins, enhanced bacterial cell attachment and improved the swimming motility of APEC. In contrast, yew, an equal molar percentage of procyanidins/prodelphinidins, and black locust, a high molar percentage of prodelphinidins, interrupted and blocked swarming and swimming motility. The data suggested that the antimicrobial activity of the CT extracts was elicited by a positive relationship between anti-biofilm formation and anti-motility capacities.

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
ID Code:87548


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