title: Anaerobic degradation of flavonoids by Eubacterium ramulus.
abstract: Eubacterium ramulus, a quercetin-3-glucoside-degrading anaerobic microorganism that occurs at numbers of approximately 10(8)/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 alpha- and beta-D-glucosidase activities, but were devoid of alpha-L-rhamnosidase activity. Based on the degradation patterns of these substrates, a pathway for the degradation of flavonoids by E. ramulus is proposed.
authors.affiliation: Gastrointestinale Mikrobiologie, Deutsches Institut für Ernährungsforschung, Bergholz-Rehbrücke, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Schneider
authors.forename: M
authors.initials: M
authors.lastname: Blaut
mesh_terms: D000693:Anaerobiosis; D005051:Eubacterium / Q000378:metabolism*; D005419:Flavonoids / Q000378:metabolism*
chemical_list: D005419:Flavonoids