Abstract
The rapid fixed-time assay for penicillinase was modified for measuring β-lactamase activity with twelve substrates, i.e., benzylpenicillin, ampicillin, cloxacillin, methicillin, carbenicillin, cefazolin, cephalothin, cephaloglycin, cephalexin, cephalosporin C, 7-aminocephalosporanic acid, and cefoxitin. The method depends upon the reduction of iodine by the hydrolyzed substrate. Determined experimentally, 1 mol of hydrolyzed penicillins consumed 3.4 to 4.0 mol of iodine (I2). Iodine consumption of hydrolyzed cephalosporins varied widely from 1.7 for cephalothin to 3.7 for cefazolin. The method is useful for routine assay of β-lactamase activity with various substrates.
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- PERRET C. J. Iodometric assay of penicillinase. Nature. 1954 Nov 27;174(4439):1012–1013. doi: 10.1038/1741012a0. [DOI] [PubMed] [Google Scholar]
- Sargent M. G. Rapid fixed-time assay for penicillinase. J Bacteriol. 1968 Apr;95(4):1493–1494. doi: 10.1128/jb.95.4.1493-1494.1968. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sawai T., Morioka K., Ogawa M., Yamagishi S. Inducible oxacillin-hydrolyzing penicillinase in Aeromonas hydrophila isolated from fish. Antimicrob Agents Chemother. 1976 Aug;10(2):191–195. doi: 10.1128/aac.10.2.191. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sawai T., Nakajima S., Morohoshi T., Yamagishi S. Thermolabile repression of cephalosporinase synthesis in Citrobacter freundii. Microbiol Immunol. 1977 Nov;21(11):631–638. doi: 10.1111/j.1348-0421.1977.tb00331.x. [DOI] [PubMed] [Google Scholar]
- Sawai T., Takahashi K., Yamagishi S., Mitsuhashi S. Variant of penicillinase mediated by an R factor in Escherichia coli. J Bacteriol. 1970 Nov;104(2):620–629. doi: 10.1128/jb.104.2.620-629.1970. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Yamagishi S., O'Hara K., Sawai T., Mitsuhashi S. The purification and properties of penicillin beta-lactamases mediated by transmissible R factors in Escherichia coli. J Biochem. 1969 Jul;66(1):11–20. doi: 10.1093/oxfordjournals.jbchem.a129111. [DOI] [PubMed] [Google Scholar]