title: Identification of [14C]carmoisine metabolites in bacterial suspension of rat faeces.
abstract: An in vitro system consisting of a bacterial suspension of human or rat faecal microflora brought about the biological reduction of the red azo dye [14C]carmoisine to 1-naphthyl-amine-4-sulphonic acid (NA) and 2-amino-1-naphthol-4-sulphonic acid (ANA). These metabolites have been unequivocally identified by radio-HPLC, spectroscopic methods, dilution with cold authentic standards and evidence that the specific activity of the diluted compounds remained constant throughout repeated crystallization, acetylation and purification. The results clearly indicated that samples derived from anaerobic incubations have to be processed for analysis in the complete absence of oxygen. In the presence of oxygen, the formation of a complex pattern of compounds in addition to NA was observed as a consequence of the chemical decomposition of ANA.
authors.affiliation: Institute of Pharmacological Sciences, University of Milan, Italy.
authors.forename: E
authors.initials: E
authors.lastname: Tragni
authors.forename: M
authors.initials: M
authors.lastname: Marinovich
authors.forename: P
authors.initials: P
authors.lastname: Ciuffreda
authors.forename: M
authors.initials: M
authors.lastname: Anastasia
authors.forename: A
authors.initials: A
authors.lastname: Ferrari
authors.forename: C L
authors.initials: CL
authors.lastname: Galli
mesh_terms: D000328:Adult; D000818:Animals; D002851:Chromatography, High Pressure Liquid; D005243:Feces / Q000382:microbiology*; D005505:Food Coloring Agents / Q000378:metabolism*; D006801:Humans; D008297:Male; D009282:Naphthalenesulfonates / Q000138:chemical synthesis / Q000302:isolation & purification / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D005505:Food Coloring Agents; D009282:Naphthalenesulfonates; C023356:naphthionic acid; C063227:2-amino-1-naphthol-4-sulfonic acid; C006671:azo rubin S