Effects of Oxygen Concentration on Biomass Production, Maximum Specific Growth Rate and Extracellular Enzyme Production by Three Species of Cutaneous Propionibacteria Grown in Continuous Culture

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Abstract
Propionibacterium acnes, P. avidum and P. granulosum were grown in continuous culture at 0-100% air saturation using a semisynthetic medium. Maximum specific growth rate, biomass concentration and extracellular lipase, hyaluronate lyase and phosphatase activities were determined. All 3 spp. were capable of growth at 100% air saturation but at reduced growth rates. The presence of O2 altered the production of extracellular enzymes. P. avidium was the best adapted for growth in aerobic environments.