Human serum protein binding of cephalosporin antibiotics in vitro
Singhvi, S.M.; Heald, A.F.; Gadebusch, H.H.; Resnick, M.E.; Difazio, L.T.; Leitz, M.A.
Journal of Laboratory and Clinical Medicine 89(2): 414-420
1977
ISSN/ISBN: 0022-2143 PMID: 833477 Document Number: 121900
The published values for serum protein binding of antibiotics vary considerably depending upon the method and experimental conditions used. A rapid, simple, and standardized ultrafiltration procedure for determination of the serum protein binding of antibiotics has been developed and used to compare the binding characteristics of four marketed cephalosporins. The human serum protein binding of cephradine, cephalexin, cephalothin, and cefazolin at 37 degrees C. and physiological pH (7.4) was found to be 13.8, 12.4, 71.2, and 89.2 per cent, respectively. These values fall within the range of published values for these antibiotics.