title: Isoflavone metabolism by a collection of lactic acid bacteria and bifidobacteria with biotechnological interest.
abstract: Almost all soy isoflavones exist as glycosides, daidzin, genistin, and glycitin. We analyzed the capacity of 92 strains of lactic acid bacteria (LAB) and bifidobacteria with biotechnological interest to process the glycosylated isoflavones daidzin, genistin, and glycitin in their more bioavailable aglycones and their metabolites as dihydrodaidzein (DHD), O-desmethylangolensin, and equol. Representative strains of the four genera studied Lactobacillus, Enterococcus, Lactococcus, and Bifidobacterium were able to produce daidzein, genistein, and glycitein, with the exception of the lactobacilli, which did not produced glycitein in soy extracts. The production of the aglycone isoflavones could be correlated with the β-glucosidase activity of the strains. The isoflavone metabolism is limited to the glycoside hydrolysis in the most of these strains. Moreover, Enterococcus faecalis INIA P333 and Lactobacillus rhamnosus INIA P540 were able to transform daidzein in DHD. LAB and bifidobacteria studied in the present work have a great potential in the metabolism of isoflavones and could be selected for the development of functional fermented soy foods.
authors.affiliation: a Departamento De Tecnología De Alimentos , Instituto Nacional De Investigación Y Tecnología Agraria Y Alimentaria (INIA) , Madrid , Spain.
authors.forename: Pilar
authors.initials: P
authors.lastname: Gaya
authors.affiliation: a Departamento De Tecnología De Alimentos , Instituto Nacional De Investigación Y Tecnología Agraria Y Alimentaria (INIA) , Madrid , Spain.
authors.forename: Ángela
authors.initials: Á
authors.lastname: Peirotén
authors.affiliation: a Departamento De Tecnología De Alimentos , Instituto Nacional De Investigación Y Tecnología Agraria Y Alimentaria (INIA) , Madrid , Spain.
authors.forename: Margarita
authors.initials: M
authors.lastname: Medina
authors.affiliation: a Departamento De Tecnología De Alimentos , Instituto Nacional De Investigación Y Tecnología Agraria Y Alimentaria (INIA) , Madrid , Spain.
authors.forename: José Maria
authors.initials: JM
authors.lastname: Landete
mesh_terms: D001644:Bifidobacterium / Q000378:metabolism*; D007529:Isoflavones / Q000737:chemistry / Q000378:metabolism*; D007778:Lactobacillus / Q000378:metabolism*; D015394:Molecular Structure
chemical_list: D007529:Isoflavones
keywords: bifidobacteria; dihydrodaidzein; isoflavones; lactic acid bacteria; β-glucosidase