Chemically defined antimicrobial susceptibility test medium for Pseudomonas aeruginosa

J. H. Jorgensen, J. C. Lee, P. M. Jones

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A chemically defined growth medium containing physiological concentrations of magnesium and calcium ions was utilized in a microdilution procedure for antimicrobial drug susceptibility testing of P. aeruginosa. Determinations of growth end points were simplified by use of sodium citrate as a sole carbon source and bromothymol blue as a pH indicator. Growth of the test organisms was detectable by a change in the indicator color from green to blue after alkalinization of the medium due to citrate utilization. Minimal inhibitory concentrations of amikacin, carbenicillin, gentamicin, and tobramycin were determined on 100 recent clinical isolates of Pseudomonas. Parallel determinations using the microdilution procedure and a conventional tube broth dilution technique incorporating Mueller Hinton broth with identical magnesium and calcium content generally agreed within one twofold dilution. Modal minimal inhibitory concentrations for susceptible strains using the microdilution method were: amikacin, 6 μg/ml; carbenicillin, 50 μg/ml; gentamicin, 1.5 μg/ml; tobramycin, 1.5 μg/ml. This modified microdilution technique allowed rapid, definitive minimal inhibitory concentration determinations, using growth end points defined by a color indicator change.

Original languageEnglish (US)
Pages (from-to)415-419
Number of pages5
JournalAntimicrobial Agents and Chemotherapy
Volume11
Issue number3
StatePublished - 1977

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Pseudomonas aeruginosa
Carbenicillin
Tobramycin
Amikacin
Growth
Gentamicins
Magnesium
Bromthymol Blue
Color
Endpoint Determination
Calcium
Indicator Dilution Techniques
Pseudomonas
Citric Acid
Carbon
Ions
Pharmaceutical Preparations

ASJC Scopus subject areas

  • Pharmacology (medical)

Cite this

Chemically defined antimicrobial susceptibility test medium for Pseudomonas aeruginosa. / Jorgensen, J. H.; Lee, J. C.; Jones, P. M.

In: Antimicrobial Agents and Chemotherapy, Vol. 11, No. 3, 1977, p. 415-419.

Research output: Contribution to journalArticle

Jorgensen, J. H. ; Lee, J. C. ; Jones, P. M. / Chemically defined antimicrobial susceptibility test medium for Pseudomonas aeruginosa. In: Antimicrobial Agents and Chemotherapy. 1977 ; Vol. 11, No. 3. pp. 415-419.
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