Influence of vehicle on antimicrobial efficiency of topical dosage forms of chloramphenicol.

Antimicrobial efficiency of chloramphenicol incorporated into ambiphilic emulsion bases was investigated, and it was shown that the efficiency was several times greater than the efficiency of a comercially available lipophilic dosage form. The efficiency was especially pronounced when the samples with a higher aqueous-phase content and of a lower viscosity were used. All ambiphilic preparations were stable when stored at 4 degrees C for 6 months, and when storage time was prolonged up to 1 year the most stable formulations were those which were prepared with a mixture of Tagat S and Tegin M.

Antibacterial and antifungal activities of isatin N-Mannich bases.

The antimicrobial and antifungal activities of 29 congeneric isatin N-Mannich bases were investigated by testing against standard test microorganisms and 21 pathogenic Gram-negative microorganisms. Considerable growth inhibition of Gram-negative bacteria and yeasts and slight inhibition of Gram-positive bacteria resulted when they were treated with the various N-Mannich bases of isatin and 5-nitroisatin, respectively.