title: Use of modified norleucine-tyrosine broth in identification of Peptostreptococcus anaerobius.
abstract: Gas-liquid chromatography was employed to analyze the volatile and nonvolatile acids produced in modified norleucine-tyrosine (MNT) broth by various gram-positive cocci. The MNT broth consists of 0.5% Trypticase (BBL Microbiology Systems, Cockeysville, Md.), 0.5% yeast extract (Difco Laboratories, Detroit, Mich.), 0.2% L-norleucine, and 0.1% L-tyrosine. The microorganisms included reference strains and clinical isolates of Peptostreptococcus spp. (P. anaerobius, P. asaccharolyticus, P. indolicus, P. magnus, and P. prevotii), Staphylococcus spp. (S. aureus, S. epidermidis, and S. saccharolyticus), and Streptococcus spp. (S. agalactiae, S. intermedius, S. mutans, S. sanguis I, and S. sanguis II). Only Peptostreptococcus anaerobius strains produced caproic and valeric acids in MNT broth cultures. All 11 P. anaerobius strains produced valeric acid in MNT broth, and only 1 strain failed to produce caproic acid in the medium. This unique feature aids in rapid, reliable identification of P. anaerobius with a minimum number of tests.
authors.affiliation: Anaerobic Bacteria Branch, Centers for Disease Control, Atlanta, Georgia 30333.
authors.forename: D K
authors.initials: DK
authors.lastname: Turgeon
authors.forename: S L
authors.initials: SL
authors.lastname: Bartley
authors.forename: V R
authors.initials: VR
authors.lastname: Dowell
mesh_terms: D000143:Acids / Q000032:analysis; D001424:Bacterial Infections / Q000175:diagnosis; D001431:Bacteriological Techniques; D002849:Chromatography, Gas; D003470:Culture Media; D005069:Evaluation Studies as Topic; D006801:Humans; D009646:Norleucine; D010462:Peptostreptococcus / Q000032:analysis / Q000302:isolation & purification*; D013045:Species Specificity; D014443:Tyrosine
chemical_list: D000143:Acids; D003470:Culture Media; D014443:Tyrosine; D009646:Norleucine