Comparative study of the binding of acylureidopenicillins and carbenicillin to human serum proteins.

Abstract:

:The binding of the acylureidopenicillins azlocillin and mezlocillin to serum proteins was investigated by means of equilibrium dialysis and ultracentrifugation. The penicillin concentrations were determined by the agar diffusion test and by circular dichroism. The degree of binding is dependent on the penicillin concentration. At a mean penicillin concentration of 20 microgram/ml 39% of azlocillin is bound by serum proteins and 35% of mezlocillin. The acylureidopenicillins are bound to about the same degree by the two proteins albumin and gamma globulin, which occur in different concentrations in serum. The binding affinity delta F degree for the interaction between azlocillin and mezlocillin to human albumin is equal to -15,389 J/mol. The corresponding values for the binding of ampicillin and carbenicillin are -17,340 and -16,800 J/mol. Albumin has one binding site of a high affinity and two binding sites of a low affinity for the acylureidopenicillins. Measurements of partition coefficients of the penicillins for isobutanol and aqueous solution show that the interaction between acylureidopenicillins and serum is mainly hydrophobic in nature. This can be deduced from the fact that for example in the presence of sisomicin azlocillin is not displaced from its albumin binding site, in contrast to carbenicillin. The reason for this difference in behaviour lies in the fact that carbenicillin, like sisomicin, is bound to the serum proteins mainly by ionic bonds. In the case of azlocillin, however, hydrophobic bounds predominate which are not influenced by the ionic bonds of sisomicin.

journal_name

Infection

journal_title

Infection

authors

Rosenkranz H,Förster D

doi

10.1007/BF01641306

subject

Has Abstract

pub_date

1979-01-01 00:00:00

pages

102-8

issue

3

eissn

0300-8126

issn

1439-0973

journal_volume

7

pub_type

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