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Growth and metabolism of sugar and acids of Leuconostoc oenos under different conditions of temperature and pH
Author(s) -
Pimentel Maria Serpa,
Silva M.H.,
Cortês Isabel,
Faia Arlete Mendes
Publication year - 1994
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1994.tb04413.x
Subject(s) - leuconostoc , fructose , mannitol , sugar , incubation , biochemistry , metabolism , chemistry , substrate (aquarium) , food science , amino acid , biology , fermentation , ecology , lactobacillus
The differences in the composition of culture media inoculated with strains of Leuconostoc oenos were more quantitative than qualitative. Both temperature of incubation and pH significantly affected bacterial growth, the rates of substrate consumption and consequently the amount of metabolites produced. All strains degraded 5 g 1 ‐1 malate, except one at pH 3.5 and 25°C. Malate was metabolized before glucose except at higher pH (4.0 and 4.5) and temperature (32°C). Citrate was completely metabolized and its consumption rate was pH‐ and temperature‐dependent. Neither acids contributed energy for growth as the Y glu remained constant in the presence or absence of acids. There was a significant increase in fructose consumed at higher temperature. Also, the final concentration of mannitol was higher but not significantly different. The addition of acids, particularly citrate, significantly repressed mannitol formation.