Jul 1, 1993

Active transport of benzylpenicillin across the blood-milk barrier

Pharmacology & Toxicology
A M Schadewinkel-ScherklH H Frey

Abstract

Passage of benzylpenicillin across the mammary gland epithelium was studied both after systemic administration of benzylpenicillin in four goats and after intramammary infusion in three goats and two cows. The results after benzylpenicillin administration alone were compared with the results after combined administration of benzylpenicillin and probenecid. The studies on passage of benzylpenicillin through the blood-milk barrier showed, when milk to plasma ultrafiltrate ratios of benzylpenicillin were plotted versus time for each half of the udders, that active transport takes place from blood to milk during steady-state plasma concentrations. Active transport was demonstrated by inhibition with probenecid: (1) The entry of benzylpenicillin into milk was slowed down under the influence of probenecid. The AUC (area under the curve)-values during the first 30 min. were reduced by 66 +/- 9% compared with the AUC-values found without coadministration of probenecid. (2) In the presence of probenecid and during equilibrium between blood and milk concentrations, benzylpenicillin reached concentration ratios in the ultrafiltrates of milk and plasma which corresponded to those expected for diffusion alone. Without probenecid these ultra...Continue Reading

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Mentioned in this Paper

Mammary Gland
Bos taurus
Process of Absorption
Epithelium
Mesothelium
Blood
High Pressure Liquid Chromatography Procedure
Urea Measurement
Metabolic Inhibition
Capra hircus

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