title: [Characterization of hydrogen peroxide production by a novel oral streptococci, S. oligofermentans isolated from human oral cavity].
abstract: High level of hydrogen peroxide was produced by S . oligofermentans, a novel oral streptococcus isolated from human oral cavity previously in our laboratory. To characterize the hydrogen peroxide production by S. oligofermentans, hydrogen peroxide yields at different growth phases and from different substrates were assayed. The results turned out that hydrogen peroxide production started at the beginning of logarithmic phase, and reached the maximal yield at the early stationary phase. Peptone and yeast extract could be the main substrates for hydrogen peroxide production. Moreover, lactate, as a fermentative product of glucose, can be another substrate for hydrogen peroxide production. Furthermore three oxidases activities possibly associated with H2O2 production were assayed, and both activities of lactate oxidase and NADH oxidase were detected under aerobic condition, while pyruvate oxidase activity was not detected in the permeabilized cells of S. oligofermentans, implying that S. oligofermentans could mainly rely on the two enzymes activities for H2O2 production.
authors.affiliation: Microbial Resources State Key Laboratory , Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080, China. chenweialar@163.com
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Hui-Chun
authors.initials: HC
authors.lastname: Tong
authors.forename: Xiu-Zhu
authors.initials: XZ
authors.lastname: Dong
mesh_terms: D006801:Humans; D006861:Hydrogen Peroxide / Q000378:metabolism*; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D009055:Mouth / Q000382:microbiology*; D009243:NAD / Q000378:metabolism; D013291:Streptococcus / Q000254:growth & development / Q000378:metabolism*
chemical_list: D009243:NAD; D006861:Hydrogen Peroxide; D007770:L-Lactate Dehydrogenase