title: Effects of difructose anhydride III (DFA III) administration on bile acids and growth of DFA III-assimilating bacterium Ruminococcus productus on rat intestine.
abstract: The growth of DFA III-assimilating bacteria in the intestines of rats fed 3% DFA III for 2 weeks was examined. Sixty-four percent of the DFA III intake had been assimilated on day 3 of ingestion, and almost all of the DFA III was assimilated at the end of the experiment. The DFA III-assimilating bacterium, Ruminococcus productus, in DFA III-fed rats was in the stationary state of 10(8)-10(9) cells/g dry feces within a week from 10(6) cells/g dry feces on day 1 of DFA III ingestion. The number of R. productus cells was associated with the amount of DFA III excreted in the feces. The acetic acid produced from DFA III by R. productus lowered the cecal pH to 5.8. In control-fed rats and DFA III-fed rats, 94% of secondary bile acids and 94% of primary bile acids, respectively, were accounted for in the total bile acids analyzed. DFA III ingestion increased the ratio of primary bile acids and changed the composition of fecal bile acids. In conclusion, R. productus assimilated DFA III, produced short chain fatty acids, and the cecal pH was lowered. The acidification of rat intestine perhaps inhibited secondary bile acid formation and decreased the ratio of secondary bile acids. Therefore, it is expected that DFA III may prevent colorectal cancer and be a new prebiotic candidate.
authors.affiliation: Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University, Kita 9, Nishi 9, Kita-ku, Sapporo, Hokkaido 060-8589, Japan.
authors.forename: Kimiko
authors.initials: K
authors.lastname: Minamida
authors.forename: Maki
authors.initials: M
authors.lastname: Kaneko
authors.forename: Midori
authors.initials: M
authors.lastname: Ohashi
authors.forename: I Nengah
authors.initials: IN
authors.lastname: Sujaya
authors.forename: Teruo
authors.initials: T
authors.lastname: Sone
authors.forename: Masaru
authors.initials: M
authors.lastname: Wada
authors.forename: Atsushi
authors.initials: A
authors.lastname: Yokota
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Hara
authors.forename: Kozo
authors.initials: K
authors.lastname: Asano
authors.forename: Fusao
authors.initials: F
authors.lastname: Tomita
mesh_terms: D000284:Administration, Oral; D000818:Animals; D001647:Bile Acids and Salts / Q000378:metabolism*; D049109:Cell Proliferation / Q000187:drug effects; D019587:Dietary Supplements; D004187:Disaccharides / Q000008:administration & dosage* / Q000032:analysis; D005243:Feces / Q000737:chemistry / Q000382:microbiology*; D007413:Intestinal Mucosa / Q000378:metabolism*; D007422:Intestines / Q000187:drug effects / Q000382:microbiology*; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D045857:Ruminococcus / Q000187:drug effects* / Q000254:growth & development*
chemical_list: D001647:Bile Acids and Salts; D004187:Disaccharides; C087758:difructose anhydride III