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Influence of carbon-dioxide tension and medium buffer concentration on medium pH and MIC values of erythromycin for Escherichia coli ATCC 25922 and Staphylococcus aureus ATCC 25923 in a micro-aerobic atmosphere



Influence of carbon-dioxide tension and medium buffer concentration on medium pH and MIC values of erythromycin for Escherichia coli ATCC 25922 and Staphylococcus aureus ATCC 25923 in a micro-aerobic atmosphere



Acta Pathologica Microbiologica et Immunologica Scandinavica. Section B Microbiology 95(4): 253-255



The effect of an elevated carbon-dioxide tension on medium pH and MIC determination with erythromycin for Staphylococcus aureus (ATCC 25923) and Escherichia coli (ATCC 25922) was investigated in a micro-aerobic atmosphere, using an agar dilution method. During 30 h of incubation in an atmosphere containing approximately 6% CO2, 5% O2 and 89% N2, pH of uninoculated, as well as of seeded, blood agar plates decreased from 7.4 to 6.8. MIC values of erythromycin were two dilution steps higher after micro-aerobic incubation than after aerobic incubation. A decrease in agar pH during micro-aerobic incubation was eliminated by increasing the phosphate buffer concentration in the medium. However, MIC values of erythromycin remained high.

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Accession: 040430365

Download citation: RISBibTeXText

PMID: 3118638

DOI: 10.1111/j.1699-0463.1987.tb03121.x


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