Determination of 2-(2-nitro-4-trifluoromethylbenzoyl)-1,3-cyclohexanedione in plasma by direct injection into a coupled column liquid chromatographic system

The chemical substance 2-(2-nitro-4-trifluoromethylbenzoyl)-1,3-cyclohexanedione (NTBC) is in clinical use for the treatment of hereditary tyrosinemia type 1. In the present study, the plasma concentration of NTBC was determined by a coupled column liquid chromatographic method. A 20-mu l volume of plasma was diluted with phosphate buffer, pH 2, and injected into a small precolumn (BioTrapAcid C-18) with a mobile phase containing sulfuric acid. The precolumn was based on the restricted access principle, i.e., retention of NTBC within the lipophilic pores, while polar and large endogenous compounds were eluted with the void volume. NTBC was transferred to the analytical column using a mobile phase with a high content of acetonitrile. The compound was monitored by UV detection at 278 nm. The standard curve was linear between 0.3 and 69 mu M, and the between-day precision (RSD) was 3% (n=6 days) at 13.8 mu M and 14% (n=6 days) at 0.3 mu M NTBC in plasma. The quantitation Limit was approximately 0.3 mu M using 20 mu l of plasma. (C) 1999 Elsevier Science B.V. All rights reserved.