Influence of oak wood and grape tannins on the lactic acid bacterium Œnococcus œni (Leuconostoc oenos, 8413)
✍ Scribed by N Vivas; M Augustin; A Lonvaud-Funel
- Book ID
- 101323870
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 84 KB
- Volume
- 80
- Category
- Article
- ISSN
- 0022-5142
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✦ Synopsis
Grape tannins, procyanidins, and oak wood tannins, ellagitannins, do not have the same effect on ênococcus úni. Oligomer procyanidins which are extracted from grape seeds are powerful inhibitors, affecting bacterial viability in non-growing conditions, bacterial growth and malolactic activity. Pure ellagitannins on the contrary appear to be propitious to the viability of ê úni, while the total oak extract is also a powerful inhibitor. We demonstrate that ellagitannins when oxidised have a strong inhibiting effect, as opposed to procyanidins which lose all effect when oxidised. One of the mechanisms involved may be compared to the one that occurs for medium-chain fatty acids, through adsorption on the bacterial walls.