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The antimicrobial activity of tobramycin against anaerobic cultures of Escherichia coli was tested in the presence of various electron carriers. The presence of 2,6-dichlorophenol 4-indophenol (DCIP) significantly enhanced the killing efficacy of tobramycin. Only 0.003% of the initial cell population (i.e. 10(6) cfu/mL) remained viable after exposure for 10 h to the mixture of antibiotic (20 x MIC, i.e. 40 mg/L) and electron acceptor (10(-3) M), as compared with 9% of surviving organisms in the presence of tobramycin alone. Less synergy was obtained with p-benzoquinone and 1,2-naphthoquinone. Fumarate did not affect the efficiency of the antibiotic. The mixture of tobramycin and DCIP was ineffective against agar-entrapped bacteria which, like biofilm organisms, are subject to oxygen limitation.

Antibacterial efficacy of tobramycin against anaerobic Escherichia coli cultures in the presence of electron acceptors