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Archives of Microbiology

, Volume 173, Issue 1, pp 71–75 | Cite as

Anaerobic degradation of flavonoids by Eubacterium ramulus

  • H. Schneider
  • M. Blaut
Short communication

Abstract

Eubacterium ramulus, a quercetin-3-glucoside-degrading anaerobic microorganism that occurs at numbers of approximately 108/g dry feces in humans, was tested for its ability to transform other flavonoids. The organism degraded luteolin-7-glucoside, rutin, quercetin, kaempferol, luteolin, eriodictyol, naringenin, taxifolin, and phloretin to phenolic acids. It hydrolyzed kaempferol-3-sorphoroside-7-glucoside to kaempferol-3-sorphoroside and transformed 3,4-dihydroxyphenylacetic acid, a product of anaerobic quercetin degradation, very slowly to non-aromatic fermentation products. Luteolin-5-glucoside, diosmetin-7-rutinoside, naringenin-7-neohesperidoside, (+)-catechin, and (–)-epicatechin were not degraded. Cell extracts of E. ramulus contained α- and β-d-glucosidase activities, but were devoid of α-l-rhamnosidase activity. Based on the degradation patterns of these substrates, a pathway for the degradation of flavonoids by E. ramulus is proposed.

Key wordsEubacterium ramulus Degradation Quercetin Kaempferol Luteolin Eriodictyol Naringenin Taxifolin Catechin Glycosides 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • H. Schneider
    • 1
  • M. Blaut
    • 1
  1. 1.Gastrointestinale Mikrobiologie, Deutsches Institut für Ernährungsforschung (DIfE) and Institut für Ernährungswissenschaft der Universität Potsdam, Arthur-Scheunert-Allee 114–116, D-14558 Bergholz-Rehbrücke, Germany e-mail: blaut@www.dife.de, Tel.:+49-33200-88470, Fax: +49-33200-88407DE

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