title: In vitro microbiological evaluation of TEI-1194 and TEI-2012, novel antipseudomonal semisynthetic penicillins.
abstract: TEI-1194, sodium 6-[D-(-)-alpha-(coumarin-3-carboxamide)-phenylacetamide] penicillanate and TEI-2012, sodium 6[D-(-)alpha-(8-hydroxy-coumarin-3-carboxamide)-phenylacetamide] penicillanate are new semisynthetic penicillin derivatives both possessing a broad spectrum of in vitro antibacterial activities. Minimal inhibitory concentrations of both agents were compared with carbenicillin. TEI-1194 and TEI-2012 were clearly found to have more potent activities especially against Pseudomonas aeruginosa than carbenicillin. At a concentration at 6.25 micrograms/ml, 85 approximately 90% of a total of 50 strains of clinically isolated P. aeruginosa were inhibited by TEI-1194 and TEI-2012, whereas carbenicillin had no effect. Evaluation of the antibacterial activity against a series of mutants producing different levels of beta-lactamases and test of the susceptibilities to some beta-lactamases demonstrated that TEI-1194 and TEI-2012 had low susceptibility to various cephalosporinases. However, both compounds were susceptible to penicillinase from Klebsiella pneumoniae H-2 at a rate of about 15% of penicillin-G taking its absolute rate as 100.
mesh_terms: D001419:Bacteria / Q000187:drug effects / Q000201:enzymology; D044482:Benzeneacetamides; D003374:Coumarins / Q000494:pharmacology; D009154:Mutation; D010400:Penicillin G / Q000031:analogs & derivatives* / Q000494:pharmacology; D010403:Penicillin Resistance; D010406:Penicillins / Q000494:pharmacology*; D011550:Pseudomonas aeruginosa / Q000187:drug effects*; D065093:beta-Lactamase Inhibitors
chemical_list: D044482:Benzeneacetamides; D003374:Coumarins; D010406:Penicillins; D065093:beta-Lactamase Inhibitors; C024505:TEI-1194; C024506:TEI-2012; D010400:Penicillin G