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Microbial degradation of tannins – A current perspective

Abstract

Tannins are water-soluble polyphenolic compounds having wide prevalence in plants. Hydrolysable and condensed tannins are the two major classes of tannins. These compounds have a range of effects on various organisms – from toxic effects on animals to growth inhibition of microorganisms. Some microbes are, however, resistant to tannins, and have developed various mechanisms and pathways for tannin degradation in their natural milieu. The microbial degradation of condensed tannins is, however, less than hydrolysable tannins in both aerobic and anaerobic environments. A number of microbes have also been isolated from the gastrointestinal tract of animals, which have the ability to break tannin-protein complexes and degrade tannins, especially hydrolysable tannins. Tannase, a key enzyme in the degradation of hydrolysable tannins, is present in a diverse group of microorganisms, including rumen bacteria. This enzyme is being increasingly used in a number of processes. Presently, there is a need for increased understanding of the biodegradation of condensed tannins, particularly in ruminants.

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Bhat, T.K., Singh, B. & Sharma, O.P. Microbial degradation of tannins – A current perspective. Biodegradation 9, 343–357 (1998). https://doi.org/10.1023/A:1008397506963

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  • biodegradation
  • condensed tannins
  • gallic acid
  • hydrolysable tannins
  • quercetin
  • rumen
  • tannase
  • tannins