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The in vitro interaction of the [6S]- and [6R]-stereoisomers of CHO-THFA with human RBCs was investigated in the (therapeutically comparable) concentration range from 1.0 to 12.5 μg/ml. Both compounds are bound to RBCs with a k RBC  ranging from 0.13 to 0.75 for [6S]-CHO-THFA and from 0.06 to 0.33 for [6R]-CHO-THFA, respectively. The interaction of the [6S]-form with RBCs is about two times higher than of the [6R]-form. Incubation of CHO-THFA with RBCs over 24 h showed an accelerated disappearance from the test solution for [6R]-CHO-THFA with a mean t 1/2  of 49.9 h in compare to t 1/2  = 58.2 h for the [6S]-enantiomer. The results indicate that RBCs may play a major role for the pharmacokinetics and metabolism of CHO-THFA and may act as an intravasal depot especially for [6S]-CHOTHFA.

Red Blood Cell Partitioning of the [6 S]- and the [6R]-Isomer of N 5 -Formyltetrahydrofolic Acid