Original Articles

Intestinal absorption of cefixime in rats.

Yi-qiao Hu, Chen-qing Qian, Liang-yuan Zheng, Wei-hai Yu, Ren-xiang Tan


To study the intestinal absorption characters of cefixime (Cef) and the factors affecting Cef absorption.
A rat intestine loop in situ technique was used to investigate the disappearance rate of Cef from the intestine. Cef concentration in the flux was measured by the reversed phase HPLC.
Cef was mainly absorbed from the upper part of the intestine. Its disappearance rate was apparently pH-dependent [(5.8 +/- 0.6) nmol.h-1/(g wet tissue) at pH 7.4, (8.9 +/- 1.4) nmol.h-1/(g wet tissue) at pH 5.0, P < 0.05)]. The uptake rate of Cef was curvilinear at 0.01-0.5 mmol.L-1. The values of apparent Kt, Jmax, and Kd were 0.114 mmol, 78.41 nmol.h-1/(g wet tissue), and 43.70 nmol.h-1.mmol-1/(g wet tissue), respectively. Sodium edetate markedly promoted the disappearance rate of Cef from the intestine.
Cef was transported partly via carrier-mediated transport system and partly via the paracellular transport system.

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